Method for resource utilization of waste biomass and application thereof
Metal-doped biochar was prepared by using specific Lewis acid metal catalysts and calcination treatment, which solved the problems of metal residue pollution and low biochar activity in the process of waste biomass resource utilization, and achieved efficient resource utilization and pollutant degradation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WUHAN UNIV OF TECH
- Filing Date
- 2026-01-23
- Publication Date
- 2026-05-29
AI Technical Summary
In the current process of utilizing waste biomass resources, the metal residues of homogeneous Lewis acid catalysts can easily cause secondary pollution, and biochar catalysts have low activity. Traditional treatment methods result in resource waste and limited pollutant degradation efficiency.
Metal-doped biochar was prepared by using specific Lewis acid metal catalysts, such as copper or manganese salts, for hydrothermal reaction, followed by calcination of lignin residue under anaerobic conditions. This biochar was used to improve the yield of 5-hydroxymethylfurfural and the catalytic activity of the biochar, and was applied to the degradation of organic pollutants and the dewatering of activated sludge.
It significantly improved the yield of 5-hydroxymethylfurfural, enhanced the conductivity and catalytic activity of biochar, realized the high-quality resource utilization of all components of waste biomass, and effectively degraded organic pollutants and dehydrated activated sludge.
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Figure CN122098568A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of waste biomass resource utilization technology, specifically relating to a method for the resource utilization of waste biomass and its application. Background Technology
[0002] With rapid socio-economic development, the output of waste biomass, especially waste forestry biomass, has surged, making its disposal an increasingly serious problem. Currently widely used treatment methods (such as open burning) not only release harmful gases containing nitrogen / carbon oxides but also waste valuable carbon resources in biomass. To enhance the resource utilization value of biomass, researchers have explored a pathway using homogeneous Lewis acid catalysts (such as AlCl3 and SnCl2) to convert lignocellulose / hemicellulose into 5-hydroxymethylfurfural (5-HMF). 5-HMF is a key platform compound listed by the U.S. Department of Energy as one of the "twelve most valuable biomass-derived chemicals" and can be used to produce sustainable fuels and high-value chemicals. However, homogeneous catalysts are prone to metal residues, introducing toxic components such as transition metals, requiring further remediation. For example, existing studies have shown that the yield of 5-HMF in agricultural waste can reach 13-19%, but the resulting lignin-rich hydrocarbon byproducts are affected by leaching Fe. 3+ / Sn 2+ It poses a serious risk of secondary pollution due to the presence of metal ions.
[0003] Another method of biomass resource utilization is to convert waste biomass into biochar catalysts for the degradation of emerging pollutants. However, the inherent limited active sites of traditional biochar restrict its efficiency in catalytically degrading pollutants, and calcination will waste resources such as lignin and glucose in biomass.
[0004] Therefore, overcoming the drawbacks of traditional resource utilization, while reducing secondary pollution from biomass catalytic conversion and improving the catalytic performance of biochar, is key to increasing the utilization rate of carbon resources in waste biomass. Summary of the Invention
[0005] The purpose of this invention is to provide a method for the resource utilization of waste biomass and its application. This method addresses problems in existing waste biomass resource utilization processes, such as the potential for secondary pollution caused by metal residues in homogeneous Lewis acid catalysts and the low activity of the prepared biochar catalysts.
[0006] In a first aspect, the present invention provides a method for the resource utilization of waste biomass, comprising the following steps: mixing waste biomass, a Lewis acid metal catalyst, and a mixed solvent and then carrying out a hydrothermal reaction; after solid-liquid separation, obtaining lignin residue and a liquid mixture; separating the liquid mixture to obtain 5-hydroxymethylfurfural; and calcining the lignin residue under anaerobic conditions to obtain metal-doped biochar; wherein the Lewis acid metal catalyst includes at least one of copper salt and manganese salt.
[0007] In this invention, the inventors discovered that by selecting specific Lewis acid metal catalysts, the yield of 5-hydroxymethylfurfural can be significantly improved. Simultaneously, metal doping of biochar significantly enhances its electrical conductivity and regulates catalytic sites, thereby increasing the generation of active species and resulting in metal-doped biochar with superior catalytic activity. This enables the high-quality, full-component resource utilization of waste biomass. Furthermore, this metal-doped biochar exhibits good degradation of organic pollutants and effective dewatering of activated sludge.
[0008] In some implementations, in the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the mass-to-volume ratio of waste biomass to mixed solvent is 1 g:(30-50 mL), and the Lewis acid metal catalyst accounts for 5-30% of the mass of waste biomass.
[0009] In some embodiments, in the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the waste biomass includes at least one of waste bamboo powder and waste pine wood.
[0010] In some embodiments, in the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the copper salt includes copper chloride and the manganese salt includes manganese chloride.
[0011] In some embodiments, in the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the mixed solvent includes ultrapure water and organic solvent, and the volume ratio of ultrapure water to organic solvent is 1:(0.1-0.2).
[0012] In some implementations, the hydrothermal reaction step, which involves mixing waste biomass, Lewis acid metal catalyst, and mixed solvent, specifically includes reacting at a temperature of 100-180°C for 5-12 hours.
[0013] In some implementations, the step of calcining the lignin residue under anaerobic conditions specifically includes: heating to 400-800°C at a heating rate of 5-10°C / min and calcining for 2-5 hours.
[0014] In a second aspect, the present invention provides the application of metal-doped biochar prepared by any of the above-described methods for the resource utilization of waste biomass in the degradation of organic pollutants.
[0015] In some implementations, the organic pollutant includes sulfamethoxazole.
[0016] In a third aspect, the present invention provides the application of metal-doped biochar prepared by any of the above-described methods for the resource utilization of waste biomass in activated sludge dewatering.
[0017] The beneficial effects of this invention are as follows: Unlike existing technologies, this invention can significantly improve the yield of 5-hydroxymethylfurfural by selecting specific Lewis acid metal catalysts; simultaneously, metal doping modification of biochar can significantly improve its conductivity, and also regulate catalytic sites and enhance the generation of active species, giving the prepared metal-doped biochar better catalytic activity, thereby realizing the full-component, high-quality resource utilization of waste biomass; furthermore, this metal-doped biochar has a good degradation effect on organic pollutants and a good dewatering effect on activated sludge; therefore, it has good application prospects. Attached Figure Description
[0018] Figure 1 This is a flowchart of the resource utilization method for waste biomass in this invention; Figure 2 The yield results of 5-HMF after Cu catalysis of waste bamboo powder in different valence states in Example 1 of this invention; Figure 3 The yield results of 5-HMF after catalysis of waste pine wood with Mn of different valence states in Example 1 of this invention; Figure 4 The yield test results of 5-hydroxymethylfurfural prepared in Examples 2-3 and Comparative Examples 1-2 of this invention; Figure 5 The following are the performance characterization test results of Cu-BBC and Mn-BBC prepared in Example 2 of the present invention, wherein (a) is the XRD pattern of Cu-BBC and Mn-BBC; (b) is the SEM image of Cu-BBC; and (c) is the SEM image of Mn-BBC. Figure 6The results of Cu-BBC and Mn-BBC prepared in Example 2 of this invention on the treatment of sulfamethoxazole-containing wastewater are shown below. (a) shows the degradation trend of Cu-BBC and Mn-BBC on sulfamethoxazole-containing wastewater; (b) shows the degradation rate of Cu-BBC and Mn-BBC on sulfamethoxazole-containing wastewater; (c) shows the treatment device for sulfamethoxazole-containing wastewater; (d) shows the electron paramagnetic resonance spectrum; (e) shows the results of the active species quenching experiment; and (f) shows the results of the active site masking experiment. Figure 7 The results of the dewatering performance test of Cu-BBC and Mn-BBC prepared in Example 2 of this invention on activated sludge are shown in the figures. (a) shows the effect of Cu-BBC and Mn-BBC on the SRF and CST of activated sludge; (b) shows the effect of Cu-BBC and Mn-BBC on the water content of activated sludge; (c) shows the dewatering efficiency of Cu-BBC and Mn-BBC on activated sludge; (d) shows the three-dimensional fluorescence analysis results of activated sludge liquid before reaction; and (e) shows the three-dimensional fluorescence analysis results of activated sludge liquid after reaction. Detailed Implementation
[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0020] Experimental methods not specified in the examples are generally performed under conventional conditions and as described in the manual, or as recommended by the manufacturer. Unless otherwise specified, the general equipment, materials, reagents, etc. used are commercially available.
[0021] Currently, existing processes for the resource utilization of waste biomass suffer from problems such as metal residues in homogeneous Lewis acid catalysts that can easily cause secondary pollution and low activity in the prepared biochar catalysts.
[0022] To address the problems of secondary pollution caused by metal residues in homogeneous Lewis acid catalysts and low activity of prepared biochar catalysts in existing waste biomass resource utilization processes, this invention provides a method for the resource utilization of waste biomass and its application.
[0023] In a first aspect, the present invention provides a method for the resource utilization of waste biomass, comprising the following steps: mixing waste biomass, a Lewis acid metal catalyst, and a mixed solvent, and then subjecting the mixture to a hydrothermal reaction; after solid-liquid separation, obtaining lignin residue and a liquid mixture; separating the liquid mixture to obtain 5-hydroxymethylfurfural (5-HMF); and calcining the lignin residue under anaerobic conditions to obtain metal-doped biochar; wherein the Lewis acid metal catalyst includes at least one of copper salt and manganese salt.
[0024] In the resource utilization method provided by this invention, the yield of 5-hydroxymethylfurfural can be significantly improved by selecting a specific Lewis acid metal catalyst. Simultaneously, metal doping modification of biochar significantly enhances its electrical conductivity and regulates catalytic sites, strengthening the generation of active species. This results in metal-doped biochar with good catalytic activity, thereby achieving high-quality resource utilization of all components of waste biomass. Furthermore, this metal-doped biochar exhibits good degradation of organic pollutants and good dewatering effect on activated sludge. In addition, the method in this invention is simple, uses inexpensive and readily available raw materials, and is suitable for large-scale production and application.
[0025] In some embodiments, in the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the mass-volume ratio of waste biomass to mixed solvent is 1g:(30-50mL), preferably 1g:40mL; the Lewis acid metal catalyst accounts for 5-30% of the mass of waste biomass, preferably 20%.
[0026] In this invention, by controlling the addition ratio of waste biomass, mixed solvent, and Lewis acid metal catalyst within a specific range, the hydrothermal reaction can be completed, significantly improving the yield of 5-hydroxymethylfurfural. At the same time, the metal is uniformly doped into the biochar, thereby improving the performance of metal-doped biochar.
[0027] In some embodiments, in the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the waste biomass includes at least one of waste bamboo powder (BBC) and waste pine wood (PBC).
[0028] It is understood that the types of waste biomass can be conventionally selected according to actual usage needs, as long as it is waste biomass material. For example, in this invention, the waste biomass preferably includes at least one of waste bamboo powder (BBC) and waste pine wood (PBC).
[0029] In some embodiments, in the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the copper salt includes copper chloride and the manganese salt includes manganese chloride.
[0030] It is understood that the types of copper and manganese salts can be conventionally selected according to actual application needs, as long as they can efficiently catalyze the hydrothermal reaction. For example, in this invention, the copper salt preferably includes copper chloride, and the manganese salt preferably includes manganese chloride.
[0031] In some embodiments, in the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the mixed solvent includes ultrapure water and organic solvent, and the volume ratio of ultrapure water to organic solvent is 1:(0.1-0.2).
[0032] In some preferred embodiments, the organic solvent includes isopropanol.
[0033] In this invention, by controlling the volume ratio of ultrapure water to organic solvent within a specific range, a better hydrothermal reaction system can be provided, which facilitates better hydrothermal reaction.
[0034] It is understood that the type of organic solvent can be conventionally selected according to actual usage needs, as long as it can efficiently carry out the hydrothermal reaction. For example, in this invention, the organic solvent preferably includes isopropanol.
[0035] In some embodiments, the hydrothermal reaction step of mixing waste biomass, Lewis acid metal catalyst and mixed solvent specifically includes: reacting at a temperature of 100-180°C (preferably 150°C) for 5-12 hours, preferably 8 hours.
[0036] In this invention, by controlling the temperature and time of the hydrothermal reaction within a specific range, the hydrothermal reaction can be completed, further significantly improving the yield of 5-hydroxymethylfurfural and the performance of metal-doped biochar.
[0037] In some embodiments, the step of calcining the lignin residue under anaerobic conditions specifically includes: heating to 400-800°C, preferably 600°C, at a heating rate of 5-10°C / min (preferably 8°C / min); and calcining for 2-5 hours; preferably 3.5 hours.
[0038] In this invention, by controlling the heating rate, temperature, and time of the calcination process within a specific range, complete calcination can be achieved, resulting in uniformly doped metal-doped biochar, thereby significantly improving the performance of the metal-doped biochar.
[0039] In a second aspect, the present invention provides the application of metal-doped biochar prepared by any of the above-described methods for the resource utilization of waste biomass in the degradation of organic pollutants.
[0040] In some implementations, the organic pollutant includes sulfamethoxazole (SMX).
[0041] It is understood that the types of organic pollutants can be conventionally selected according to actual usage needs, as long as they can be efficiently degraded. For example, in this invention, the organic pollutant preferably includes sulfamethoxazole (SMX).
[0042] In a third aspect, the present invention provides the application of metal-doped biochar prepared by any of the above-described methods for the resource utilization of waste biomass in activated sludge dewatering.
[0043] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0044] Please see Figure 1 This is a flowchart of the resource utilization method for waste biomass in this invention. Specifically, the resource utilization method includes the following steps: mixing waste biomass, Lewis acid metal catalyst, and mixed solvent, and then carrying out a hydrothermal reaction; after solid-liquid separation, lignin residue and a liquid mixture are obtained; the liquid mixture is separated to obtain 5-hydroxymethylfurfural; and the lignin residue is calcined under anaerobic conditions to obtain metal-doped biochar.
[0045] Example 1 In this embodiment, the types of Lewis acid metal catalysts were screened and tested to obtain Lewis acid metal catalysts with better catalytic performance.
[0046] Specifically, it includes the following steps: 1g of waste bamboo powder (BBC) and 40mL of mixed solvent (ultrapure water to isopropanol volume ratio of 1:0.15) were placed in a reaction vessel, and then 0.2g of copper (Cu) was added. 0 Either cuprous chloride (Cu(I)) or cupric chloride (Cu(II)) was used; and the reaction was carried out at 150℃ for 8 hours; after cooling, solid-liquid separation was performed, and the liquid was further extracted to test the concentration and recovery rate of 5-HMF. The results are as follows: Figure 2 As shown.
[0047] from Figure 2 As can be seen, Cu(II) exhibits the best catalytic performance, increasing the yield of 5-HMF to about 22%. Therefore, divalent copper salts have the best catalytic effect.
[0048] Similarly, 1g of waste pine wood (PBC) and 40mL of mixed solvent (ultrapure water to isopropanol volume ratio of 1:0.15) were placed in a reaction vessel, and then 0.2g of manganese chloride (Mn(II)), MnO2 (Mn(IV)), K2MnO4 (Mn(VI)), or KMnO4 (Mn(VII)) were added respectively; the reaction was carried out at 150℃ for 8h; after cooling, solid-liquid separation was performed, and the liquid was further extracted to test the 5-HMF concentration and recovery rate. The results are as follows. Figure 3 As shown.
[0049] from Figure 3 As can be seen, compared with other valence states of Mn, Mn(II) also exhibits the best catalytic performance. Therefore, manganese chloride has the best catalytic effect. Other valence states of Mn have poor catalytic effects, which may be because Mn(Ⅳ), Mn(Ⅵ), and Mn(Ⅶ) have strong hydrolytic activity, resulting in extremely low activity in catalyzing the conversion of biomass to 5-HMF, making it difficult to produce 5-HMF.
[0050] Example 2 In this embodiment, Cu(II) and Mn(II) obtained in Example 1 are used as catalysts, and waste bamboo powder (BBC) is utilized as a resource.
[0051] Specifically, it includes the following steps: 1) Place 1g of waste bamboo powder (BBC) and 40mL of mixed solvent (ultrapure water and isopropanol in a volume ratio of 1:0.15) in a reaction vessel, then add 0.2g of copper chloride (Cu(II)) or manganese chloride (Mn(II)) respectively; and react at 150℃ for 8h to obtain lignin residue and liquid mixture; 2) Separate the liquid mixture obtained in step 1) to obtain 5-hydroxymethylfurfural; 3) After vacuum drying the lignin residue obtained in step 1), place it in a ceramic boat and heat it to 600°C in a tube furnace under N2 atmosphere at a heating rate of 8°C / min, and calcine it for 3.5 h to obtain metal-doped biochar (Cu-BBC and Mn-BBC, respectively).
[0052] Example 3 In this embodiment, Cu(II) and Mn(II) obtained in Example 1 are used as catalysts to utilize waste pine wood (PBC) as a resource.
[0053] Specifically, it includes the following steps: 1) Place 1g of waste pine wood (PBC) and 40mL of mixed solvent (ultrapure water and isopropanol in a volume ratio of 1:0.15) in a reaction vessel, then add 0.2g of copper chloride (Cu(II)) or manganese chloride (Mn(II)) respectively; and react at 150℃ for 8h; to obtain lignin residue and liquid mixture. 2) Separate the liquid mixture obtained in step 1) to obtain 5-hydroxymethylfurfural; 3) After vacuum drying the lignin residue obtained in step 1), place it in a ceramic boat and heat it to 600°C in a tube furnace under N2 atmosphere at a heating rate of 8°C / min, and calcine it for 3.5 h to obtain metal-doped biochar (Cu-PBC and Mn-PBC, respectively).
[0054] Comparative Example 1 In this comparative example, the method for resource utilization of waste bamboo powder (BBC) is basically the same as in Example 2, except that no catalyst is added.
[0055] Comparative Example 2 In this comparative example, the method for resource utilization of waste pine wood (PBC) is basically the same as in Example 3, except that no catalyst is added.
[0056] Performance testing The yields of 5-hydroxymethylfurfural prepared in Examples 2-3 and Comparative Examples 1-2 were tested, and the results are as follows: Figure 4 As shown.
[0057] from Figure 4 As can be seen, doping biochar with Cu or Mn can significantly promote the formation of 5-HMF and effectively improve its yield.
[0058] Furthermore, exemplary, the Cu-BBC and Mn-BBC prepared in Example 2 were subjected to performance characterization tests, and the results are as follows: Figure 5 As shown.
[0059] from Figure 5 As can be seen from the SEM image, Mn-BBC (see figure) Figure 5c) Strong C diffraction peaks appeared at 44.0°, 64.0°, and 77.4° (standard card PDF#00-050-09), indicating that the main crystalline phase of the biomass residue after pyrolysis is graphitic carbon; multiple additional diffraction peaks appeared at 34.7°, 40.3°, 58.3°, 69.7°, and 73.3°, corresponding to the (111), (200), (220), (311), and (222) crystal planes in MnO (standard card PDF#04-007-3620), respectively, indicating that Mn was successfully doped into the biochar through pyrolysis; Cu-BBC (SEM image see...) Figure 5 (b) The main crystalline phase structure is graphitic carbon and Cu, indicating that Cu was successfully doped into biochar through pyrolysis. Figure 5 a).
[0060] Application Test Example 1 In this application test example, the metal-doped biochar Cu-BBC and Mn-BBC prepared in Example 2 were used, and the biochar prepared in Comparative Example 1 was used as a control to test wastewater containing sulfamethoxazole (SMX).
[0061] Specifically, refer to Figure 6 In apparatus c, wastewater containing SMX / PDS (30 mg / L / 5 mM) is passed into a reaction tube (filled with metal-doped biochar Cu-BBC, Mn-BBC, or other biochar), and the SMX content in the effluent is tested. The SMX concentration is determined by high-performance liquid chromatography (HPLC) with a mobile phase of 0.1% (v / v) acetic acid and acetonitrile (v / v = 40%:60%) at a flow rate of 0.6 mL / min. –1 Using 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as a scavenging agent, the types of active species were determined using electron paramagnetic resonance spectroscopy. With other experimental conditions unchanged, tert-butanol (TBA, 500 mM), methanol (MeOH, 500 mM), furfuryl alcohol (FFA, 100 mM), and catalase (CAT, 300 mg / L) were added to the system at the beginning of the reaction to quench ROS such as hydroxyl radicals, sulfate radicals, singlet oxygen, and hydrogen peroxide, respectively. The concentration changes of SMX were measured at regular intervals to investigate the main active species in SMX degradation. Na3PO4 (0.10 mM) was added to the system at the beginning of the reaction to mask metal sites, and the concentration changes of SMX were measured at regular intervals to investigate the main active sites. The results are as follows: Figure 6 As shown.
[0062] from Figure 6 As can be seen, compared with the control, the metal-doped biochar Cu-BBC and Mn-BBC in this invention have better degradation efficiency for SMX. Figure 6a); After 50 hours of continuous operation, the degradation rate of SMX remained at around 90% ( Figure 6 (b) The biochar catalyst prepared by this invention exhibits strong stability. Quenching experiments and active site masking experiments ( Figure 6 (d, 6e, 6f) indicates that singlet oxygen is the key reactive species for SMX degradation, and the manganese-nitrogen coordination structure (Mn-N) x ) is the main active site for PDS activation and the generation of active species.
[0063] Application Test Example 2 In this application test example, the metal-doped biochar Cu-BBC and Mn-BBC prepared in Example 2 were used, and the biochar prepared in Comparative Example 1 was used as a control to test the dewatering performance of activated sludge.
[0064] Specifically, CST and SRF were measured using a CST analyzer and the Buchner funnel method, respectively. The sludge moisture content was tested according to the method in "Standard Test Methods for Municipal Sludge" (CJ / T 221-2023). A portion of the sludge cake was taken out and placed in an evaporating dish, dried at 105℃ in an oven for 6–8 hours until constant weight, cooled in a desiccator, and weighed. The weight was calculated using the following formula: ; In the formula, W1 is the mass of the empty evaporating dish (g); W2 is the mass of the evaporating dish and the wet sample (g); W3 is the mass of the evaporating dish and the dried sample (g). The results are as follows: Figure 7 As shown.
[0065] from Figure 7 As can be seen, the SRF of activated sludge after Mn-BBC or Cu-BBC conditioning decreased from the original 12×10 12 m / kg decreased to 6.1×10 12 m / kg and 3.8×10 12 m / kg, CST decreased from the original CST of 90s to 52s and 41s ( Figure 7 a); the moisture content decreased from 93% to 79.2% and 72.8% ( Figure 7 b) significantly reduced the water content in activated sludge; and Mn-BBC or Cu-BBC had good dewatering efficiency for activated sludge. Figure 7 c); After the reaction, the intensity of the characteristic peaks of fulvic acid-like substances decreased, and the characteristic peaks of humic acid-like substances almost disappeared, indicating that the content of organic matter in the liquid phase decreased significantly after conditioning. Figure 7 (d, 7e) The above results indicate that Mn-BBC or Cu-BBC has good application potential for the conditioning of activated sludge.
[0066] In summary, this invention can significantly improve the yield of 5-hydroxymethylfurfural by selecting specific Lewis acid metal catalysts; at the same time, metal doping modification of biochar can significantly improve its conductivity, and also regulate catalytic sites and enhance the generation of active species, so that the prepared metal-doped biochar has good catalytic activity, thereby realizing the full-component, high-quality resource utilization of waste biomass; furthermore, the metal-doped biochar has a good degradation effect on organic pollutants and a good dewatering effect on activated sludge.
[0067] It should be noted that all the above embodiments belong to the same inventive concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.
[0068] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A method for the resource utilization of waste biomass, characterized in that, Includes the following steps: Waste biomass, Lewis acid metal catalyst and mixed solvent are mixed and then subjected to hydrothermal reaction. After solid-liquid separation, lignin residue and liquid mixture are obtained. The liquid mixture was separated to obtain 5-hydroxymethylfurfural; The lignin residue was calcined under anaerobic conditions to obtain metal-doped biochar. The Lewis acid metal catalyst includes at least one of copper salt and manganese salt.
2. The method for resource utilization of waste biomass according to claim 1, characterized in that, In the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the mass-to-volume ratio of the waste biomass to the mixed solvent is 1 g:(30-50 mL), and the Lewis acid metal catalyst accounts for 5-30% of the mass of the waste biomass.
3. The method for resource utilization of waste biomass according to claim 1, characterized in that, In the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the waste biomass includes at least one of waste bamboo powder and waste pine wood.
4. The method for resource utilization of waste biomass according to claim 1, characterized in that, In the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the copper salt includes copper chloride and the manganese salt includes manganese chloride.
5. The method for resource utilization of waste biomass according to claim 1, characterized in that, In the step of carrying out a hydrothermal reaction after mixing waste biomass, Lewis acid metal catalyst and mixed solvent, the mixed solvent includes ultrapure water and organic solvent, and the volume ratio of ultrapure water to organic solvent is 1:(0.1-0.2).
6. The method for resource utilization of waste biomass according to claim 1, characterized in that, In the step of mixing waste biomass, Lewis acid metal catalyst and mixed solvent and carrying out hydrothermal reaction, the hydrothermal reaction specifically includes: reacting at a temperature of 100-180℃ for 5-12 hours.
7. The method for resource utilization of waste biomass according to claim 1, characterized in that, In the step of calcining the lignin residue under anaerobic conditions, the calcination process specifically includes: heating to 400-800℃ at a heating rate of 5-10℃ / min and calcining for 2-5 hours.
8. The application of metal-doped biochar prepared by the resource utilization method of waste biomass as described in any one of claims 1-7 in the degradation of organic pollutants.
9. The application according to claim 8, characterized in that, The organic pollutants include sulfamethoxazole.
10. The application of metal-doped biochar prepared by the resource utilization method of waste biomass as described in any one of claims 1-7 in activated sludge dewatering.