Biological scale-inhibiting dispersant

Abstract

The present application relates to the technical field of water treatment agent, and relates to a novel biological scale inhibition dispersant. Each component is calculated by weight parts and includes the following components: 30 parts of polyaspartic acid, 5 parts of sodium lignosulfonate, and 5 parts of reduced graphene oxide / carbon quantum dot composite. The present application uses polyaspartic acid, low-molecular-weight sodium lignosulfonate, and alkaline amino acid (arginine, histidine, or lysine) modified reduced graphene oxide / dragon fruit carbon quantum dot composite to synergistically compound, and the system is phosphorus-free, heavy metal-free, and organic solvent-free, and can be directly used in circulating cooling water, reduces the hardness of circulating water, and reduces hidden dangers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment agent, and particularly relates to a biological scale inhibition dispersant. BACKGROUND

[0002] City garbage, which is originally the "orphan" of life, is redefined as "misplaced resources". Waste power generation is a resource technology that converts city garbage into electric energy through high-temperature incineration: garbage is fully burned in a furnace above 850 DEG C, the released heat generates steam through a waste heat boiler to drive a steam turbine unit to generate power, and a flue gas purification system is matched to ensure that the emission index is better than the national standard, the slag is recycled for metal and then used as building materials, and the fly ash is safely landfilled after solidification, so that garbage reduction is 90%, harmless 100% and energy utilization, a single plant can process thousands of tons of garbage per day, supply hundreds of millions of degrees of power per year, and save more than 100,000 tons of standard coal.

[0003] As the "cooling heart" of the incineration line, the circulating cooling tower improves the water efficiency while cooling, and its water replenishment traditionally relies on tap water; in order to save clean water, many power plants further inject the filtrate membrane filtration liquid into the tower. However, the evaporation concentration effect increases the hardness of the circulating water, and the high-hardness water is easy to scale in the pipe network, which hides hidden dangers for stable operation. SUMMARY

[0004] To solve the problems in the prior art, the present application provides a biological scale inhibition dispersant.

[0005] The present application is realized by the following technical scheme:

[0006] A biological scale inhibition dispersant, each component is calculated by weight parts, and includes the following ingredients: 30 parts of polyaspartic acid, 5 parts of sodium lignosulfonate, and 5 parts of reduced graphene oxide / carbon quantum dot composite.

[0007] The carbon quantum dots are dragon fruit carbon quantum dots. The preparation method of the dragon fruit carbon quantum dots is as follows: the dragon fruit peel is dried and ground into powder; the dragon fruit peel powder is mixed with deionized water, ultrasonically dispersed, and then transferred to a stainless steel autoclave with a polytetrafluoroethylene liner, and reacted at 200 DEG C for 12 hours; after the reaction is completed, the system is naturally cooled to room temperature, the precipitate is removed by centrifugation, and then filtered through a filter membrane to collect the yellow supernatant; the obtained liquid is placed in a dialysis bag with a molecular weight cut-off of 1000, and dialyzed with deionized water for 24 hours; after dialysis, freeze-drying is performed for 12 hours to remove all water, and the dragon fruit carbon quantum dots are obtained.

[0008] Further, the reduced graphene oxide / carbon quantum dot composite is one of an L-arginine modified reduced graphene oxide / carbon quantum dot composite, an L-histidine modified reduced graphene oxide / carbon quantum dot composite, or an L-lysine modified reduced graphene oxide / carbon quantum dot composite.

[0009] Further, the reduced graphene oxide / carbon quantum dot composite is an L-arginine modified reduced graphene oxide / carbon quantum dot composite, and the preparation method is as follows: 0.5g of the dragon fruit carbon quantum dots is dispersed in 10mL of deionized water to obtain an A solution; 0.2g of the L-arginine modified reduced graphene oxide is dispersed in 10mL of deionized water to obtain a B solution; the A solution and the B solution are uniformly mixed, and then reacted in a 60℃ water bath for 10h; after the reaction is completed, the precipitate is obtained by centrifugation, the precipitate is washed with deionized water for 3 times, and then freeze-dried to obtain the composite.

[0010] Further, the reduced graphene oxide / carbon quantum dot composite is an L-arginine modified reduced graphene oxide / carbon quantum dot composite, and the preparation method is as follows: 0.5g of the dragon fruit carbon quantum dots is dispersed in 10mL of deionized water to obtain an A solution; 0.2g of the L-arginine modified reduced graphene oxide is dispersed in 10mL of deionized water to obtain a B solution; the A solution and the B solution are uniformly mixed, and then reacted in a 60℃ water bath for 10h; after the reaction is completed, the precipitate is obtained by centrifugation, the precipitate is washed with deionized water for 3 times, and then freeze-dried to obtain the composite.

[0011] Further, the reduced graphene oxide / carbon quantum dot composite is an L-arginine modified reduced graphene oxide / carbon quantum dot composite, and the preparation method is as follows: 0.5g of the dragon fruit carbon quantum dots is dispersed in 10mL of deionized water to obtain an A solution; 0.2g of the L-arginine modified reduced graphene oxide is dispersed in 10mL of deionized water to obtain a B solution; the A solution and the B solution are uniformly mixed, and then reacted in a 60℃ water bath for 10h; after the reaction is completed, the precipitate is obtained by centrifugation, the precipitate is washed with deionized water for 3 times, and then freeze-dried to obtain the composite.

[0012] Further, the molecular weight of the sodium lignosulfonate is 2000-4000.

[0013] The application further provides a preparation method of the biological scale inhibition dispersant, which comprises uniformly mixing the components at room temperature.

[0014] Compared with the prior art, the application has the following advantages and beneficial effects:

[0015] The application adopts polyaspartic acid, low molecular weight sodium lignosulfonate and basic amino acid (arginine, histidine or lysine) to modify reduced graphene oxide / dragon fruit carbon quantum dot composite, all components can be physically blended at room temperature to obtain the product, and the process is zero emission; the dragon fruit carbon quantum dots are obtained by hydrothermal treatment at 200 DEG C, dialysis and freeze-drying with the fruit peel as the only carbon source, the raw material is renewable, and the process does not require additional additives; the composite realizes the coupling of the conductive skeleton and the surface carboxyl / amino group by loading the carbon quantum dots on the amino acid functionalized reduced graphene oxide, thereby providing three scale inhibition mechanisms of lattice distortion, electrostatic repulsion and template shielding. The scale inhibition dispersant composed of L-arginine modified reduced graphene oxide / carbon quantum dot composite has good scale inhibition rate at low content; the obtained formula has good scale inhibition rate under the condition of GB / T 16632-2019; the lignosulfonate molecular weight is limited to 2000-4000 to ensure the dispersion performance and reduce the risk of viscosity increase; the system is free of phosphorus, heavy metals and organic solvents, and can be directly used for circulating cooling water to reduce the hardness of circulating water and reduce the hidden danger. 2+ has good scale inhibition rate; the lignosulfonate molecular weight is limited to 2000-4000 to ensure the dispersion performance and reduce the risk of viscosity increase; the system is free of phosphorus, heavy metals and organic solvents, and can be directly used for circulating cooling water to reduce the hardness of circulating water and reduce the hidden danger. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the principles of the application.

[0017] Figure 1 is the calcium carbonate scale inhibition rate test result at a constant temperature of 50 DEG C;

[0018] Figure 2 is the calcium carbonate scale inhibition rate test result at a constant temperature of 80 DEG C. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with reference to the embodiments and drawings, the illustrative embodiments of the present application and the description thereof are only used to explain the present application, and do not limit the present application.

[0020] The synthesis method of the dragon fruit carbon quantum dots in the present application is as follows: the dragon fruit peel is dried and ground into powder, and then the powder is passed through a 0.5 mu m screen to obtain precursor particles with uniform particle size; 1.2 g of the dragon fruit peel powder is mixed with 25 mL of deionized water, and then ultrasonic dispersion is performed, and the mixture is transferred to a stainless steel autoclave with a polytetrafluoroethylene liner, and then the mixture is reacted at 200 DEG C for 12 hours; after the reaction is completed, the mixture is naturally cooled to room temperature, and then the precipitate is removed by centrifugation, and then the mixture is filtered through a 0.2 mu m filter membrane to collect the yellow supernatant; the obtained liquid is placed in a dialysis bag with a molecular weight cut-off of 1000, and then the liquid is dialyzed against deionized water for 24 hours; after dialysis, the liquid is freeze-dried for 12 hours to remove all water, and then the dragon fruit carbon quantum dots are obtained.

[0021] Example 1

[0022] A biological scale-inhibiting dispersant comprises, by weight parts, 30 parts of polyaspartic acid, 5 parts of sodium lignosulfonate with a molecular weight of 2000-4000, and 5 parts of L-arginine modified reduced graphene oxide / carbon quantum dot composite.

[0023] The preparation method of the biological scale-inhibiting dispersant is to uniformly mix the components at room temperature.

[0024] The preparation method of the L-arginine modified reduced graphene oxide / carbon quantum dot composite is as follows: 0.5 g of pitaya carbon quantum dots is dispersed in 10 mL of deionized water to obtain an A solution; 0.2 g of L-arginine modified reduced graphene oxide is dispersed in 10 mL of deionized water to obtain a B solution; the A solution and the B solution are uniformly mixed, and then reacted in a 60℃ water bath for 10 h; after the reaction is completed, the precipitate is obtained by centrifugation, the precipitate is washed with deionized water for 3 times, and then freeze-dried to obtain the composite.

[0025] The preparation method of the L-arginine modified reduced graphene oxide is as follows: 0.5 g of graphene is dispersed in 100 mL of deionized water, and then ultrasonic treatment is continued for 15 min; 2.5 g of NaOH is added at the 5th min of ultrasonic treatment, and 2.5 g of L-arginine is added at the 10th min; after the reaction is completed, the precipitate is obtained by centrifugation at 4500 rpm for 15 min; the precipitate is washed with a 1:1 water-ethanol mixture, and the washing is repeated until the precipitate is neutral; the precipitate is dried at 60℃ for 24 h to obtain the L-arginine modified reduced graphene oxide.

[0026] Example 2

[0027] A biological scale-inhibiting dispersant comprises, by weight parts, 30 parts of polyaspartic acid, 5 parts of sodium lignosulfonate with a molecular weight of 2000-4000, and 5 parts of L-arginine modified reduced graphene oxide / carbon quantum dot composite.

[0028] The preparation method of the biological scale-inhibiting dispersant is to uniformly mix the components at room temperature.

[0029] The preparation method of the L-arginine modified reduced graphene oxide / carbon quantum dot composite is as follows: 0.5 g of pitaya carbon quantum dots is dispersed in 10 mL of deionized water to obtain an A solution; 0.2 g of L-arginine modified reduced graphene oxide is dispersed in 10 mL of deionized water to obtain a B solution; the A solution and the B solution are uniformly mixed, and then reacted in a 60℃ water bath for 10 h; after the reaction is completed, the precipitate is obtained by centrifugation, the precipitate is washed with deionized water for 3 times, and then freeze-dried to obtain the composite.

[0030] The L-histidine modified reduced graphene oxide is prepared as follows: 0.5 g of graphene is dispersed in 100 mL of deionized water, and ultrasonic treatment is continued for 15 min, wherein 2.5 g of NaOH is added at the 5th min of ultrasonic treatment, and 2.5 g of L-histidine is added at the 10th min of ultrasonic treatment; after the reaction is completed, centrifugal separation is performed at 4500 rpm for 15 min to obtain a precipitate, the precipitate is washed with a 1:1 water-ethanol mixture, and the washing is repeated until the precipitate is neutral; and the precipitate is dried at 60℃ for 24 h to obtain the L-histidine modified reduced graphene oxide.

[0031] Example 3

[0032] A biological scale-inhibiting dispersant, which comprises, by weight parts, 30 parts of polyaspartic acid, 5 parts of sodium lignosulfonate with a molecular weight of 2000-4000, and 5 parts of L-lysine modified reduced graphene oxide / carbon quantum dot composite.

[0033] The preparation method of the biological scale-inhibiting dispersant is to uniformly mix the components at room temperature.

[0034] The preparation method of the L-lysine modified reduced graphene oxide / carbon quantum dot composite is as follows: 0.5 g of dragon fruit carbon quantum dots is dispersed in 10 mL of deionized water to obtain an A solution; 0.2 g of L-histidine modified reduced graphene oxide is dispersed in 10 mL of deionized water to obtain a B solution; the A solution and the B solution are uniformly mixed, and then reacted in a 60℃ water bath for 10 h; after the reaction is completed, centrifugal separation is performed to obtain a precipitate, the precipitate is washed with deionized water for 3 times, and then freeze-dried to obtain the composite.

[0035] The L-lysine modified reduced graphene oxide is prepared as follows: 0.5 g of graphene is dispersed in 100 mL of deionized water, and ultrasonic treatment is continued for 15 min, wherein 2.5 g of NaOH is added at the 5th min of ultrasonic treatment, and 2.5 g of L-lysine is added at the 10th min of ultrasonic treatment; after the reaction is completed, centrifugal separation is performed at 4500 rpm for 15 min to obtain a precipitate, the precipitate is washed with a 1:1 water-ethanol mixture, and the washing is repeated until the precipitate is neutral; and the precipitate is dried at 60℃ for 24 h to obtain the L-lysine modified reduced graphene oxide.

[0036] Comparative Example 1

[0037] A biological scale-inhibiting dispersant, which comprises, by weight parts, 30 parts of polyaspartic acid, and 5 parts of sodium lignosulfonate with a molecular weight of 2000-4000.

[0038] The preparation method of the biological scale-inhibiting dispersant is to uniformly mix the components at room temperature.

[0039] Comparative Example 2

[0040] A biological scale-inhibiting dispersant comprises, by weight parts, 30 parts of polyaspartic acid, 5 parts of sodium lignosulfonate with a molecular weight of 2000-4000, and 5 parts of carbon quantum dots. The carbon quantum dots are pitaya carbon quantum dots.

[0041] The preparation method of the biological scale-inhibiting dispersant is to uniformly mix the components at room temperature.

[0042] Comparative Example 3

[0043] A biological scale-inhibiting dispersant comprises, by weight parts, 30 parts of polyaspartic acid, 5 parts of sodium lignosulfonate with a molecular weight of 2000-4000, and 5 parts of L-arginine modified reduced graphene oxide.

[0044] The preparation method of the biological scale-inhibiting dispersant is to uniformly mix the components at room temperature.

[0045] The preparation method of the L-arginine modified reduced graphene oxide is as follows: 0.5 g of graphene is dispersed in 100 mL of deionized water, and ultrasonic treatment is continued for 15 min, wherein 2.5 g of NaOH is added at the 5th min of ultrasonic treatment, and 2.5 g of L-arginine is added at the 10th min; after the reaction is completed, centrifugation is performed at 4500 rpm for 15 min to obtain a precipitate, the precipitate is washed with a 1:1 water-ethanol mixture, and the washing is repeated until the precipitate is neutral; the precipitate is dried at 60°C for 24 h to obtain L-arginine modified reduced graphene oxide.

[0046] Test Example

[0047] The calcium carbonate scale inhibition performance of the scale inhibitors prepared in Examples 1-3 and Comparative Examples 1-3 was evaluated according to GB / T 16632-2019 "Determination of scale inhibition performance of water treatment agent - calcium carbonate deposition method", and the change in Ca 2+ content in the water sample before and after the addition of the scale inhibitor was determined, the constant temperature time was 10 h, and the calcium carbonate scale inhibition rate test results at a constant temperature of 50°C are shown in Table 1. The calcium carbonate scale inhibition rate test results at a constant temperature of 80°C are shown in Table 2. Figure 1 Figure 2

[0048] The calcium carbonate scale inhibition rate at 50°C is shown in Table 1:

[0049] Table 1

[0050]

[0051] The calcium carbonate scale inhibition rate at 80°C is shown in Table 2:

[0052] Table 2

[0053] ​​

[0054] From the table, at 50℃, the scale inhibition rates of Examples 1-3 at a dosage of 25 mg / L are all ≥96.4%, which are significantly higher than those of Comparative Examples 1-3. At a low dosage of 5 mg / L, the scale inhibition rates of Examples 1-3 are 59.5%-63.2%, which are still 17-21 percentage points higher than the highest value of Comparative Examples, proving that the amino acid modified graphene / carbon quantum dot composite can trigger a synergistic scale inhibition effect at a very low concentration. Among them, the composite composed of L-arginine in Example 1 has a very good scale inhibition rate at a low concentration compared with L-histidine and L-lysine.

[0055] The above detailed description of the specific embodiments has further detailed the purposes, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A biological scale inhibitor and dispersant, characterized in that, The components, by weight, include the following: 30 parts polyaspartic acid, 5 parts sodium lignosulfonate, and 5 parts reduced graphene oxide / carbon quantum dot composite. The carbon quantum dots are dragon fruit carbon quantum dots; The preparation method of the dragon fruit carbon quantum dots is as follows: Dragon fruit peel is dried and ground into powder; the dragon fruit peel powder is mixed with deionized water, ultrasonically dispersed, and then transferred to a stainless steel autoclave lined with polytetrafluoroethylene (PTFE). The mixture is reacted at 200°C for 12 hours; after the reaction, it is naturally cooled to room temperature, centrifuged to remove the precipitate, and then filtered through a filter membrane to collect the yellow supernatant; the resulting liquid is placed in a dialysis bag with a molecular weight cutoff of 1000 and dialyzed with deionized water for 24 hours; after dialysis, it is freeze-dried for 12 hours to remove all moisture, yielding dragon fruit carbon quantum dots. The reduced graphene oxide / carbon quantum dot composite is an L-arginine-modified reduced graphene oxide / carbon quantum dot composite, which is prepared as follows: 0.5g of dragon fruit carbon quantum dots are dispersed in 10mL of deionized water to obtain solution A; 0.2g of L-arginine-modified reduced graphene oxide is dispersed in 10mL of deionized water to obtain solution B; solutions A and B are mixed evenly and reacted in a 60℃ water bath for 10h. After the reaction is completed, the precipitate is obtained by centrifugation, the precipitate is washed three times with deionized water, and then freeze-dried to obtain the composite. Alternatively, the reduced graphene oxide / carbon quantum dot composite is an L-lysine-modified reduced graphene oxide / carbon quantum dot composite, which is prepared as follows: 0.5g of dragon fruit carbon quantum dots are dispersed in 10mL of deionized water to obtain solution A; 0.2g of L-lysine-modified reduced graphene oxide is dispersed in 10mL of deionized water to obtain solution B; solutions A and B are mixed evenly and reacted in a 60℃ water bath for 10h. After the reaction is completed, the precipitate is obtained by centrifugation, the precipitate is washed three times with deionized water, and then freeze-dried to obtain the composite. Alternatively, the reduced graphene oxide / carbon quantum dot composite is an L-histidine-modified reduced graphene oxide / carbon quantum dot composite, which is prepared as follows: 0.5g of dragon fruit carbon quantum dots are dispersed in 10mL of deionized water to obtain solution A; 0.2g of L-histidine-modified reduced graphene oxide is dispersed in 10mL of deionized water to obtain solution B; solutions A and B are mixed evenly and reacted in a 60℃ water bath for 10h. After the reaction is completed, the precipitate is obtained by centrifugation, the precipitate is washed three times with deionized water, and then freeze-dried to obtain the composite.

2. The bioscale inhibitor and dispersant as described in claim 1, characterized in that, The molecular weight of the sodium lignosulfonate is 2000~4000.

Images