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Modified rice straw biochar adsorption material, and preparation method and application thereof

An adsorption material, biochar technology, applied in the application, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problem of inability to apply septic tank manure separation liquid treatment and resource utilization, poor selectivity, and low adsorption capacity and other problems to achieve the effect of resource reuse

Pending Publication Date: 2021-07-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low adsorption capacity and poor selectivity of rice straw biochar to pollutants, it cannot be applied to the treatment and resource utilization of septic tank feces and sewage separation liquid.

Method used

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  • Modified rice straw biochar adsorption material, and preparation method and application thereof
  • Modified rice straw biochar adsorption material, and preparation method and application thereof
  • Modified rice straw biochar adsorption material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1. Grind and sieve rice straw biochar (RSB) to 20 mesh, soak 100 g of carbon in 1000 mL of 1 mol / L HCl solution for 1 h, and then wash repeatedly with ultrapure water until close to Neutral, put it in an oven at 105°C and dry it to constant weight to obtain acid-washed biochar (PRSB).

[0034] Step 2. Take 10 g of PRSB respectively and dissolve them in 100 mL, 1 mol / L FeCl 3 , Fe 2 (SO 4 ) 3 , CaCl 2 solution, after magnetic stirring at room temperature for 1 h, let it stand for 24 h, put it in an oven at 105 °C and dry it to constant weight to obtain acid-washed metal-modified biochars, correspondingly recorded as: PRSB-Fe-5, PRSB- FS-5, PRSB-Ca-5 (the number 5 indicates the loading amount of metal elements, mmol / g, FS indicates the mixture of Fe and S elements).

Embodiment 2

[0036] Step 1 is the same as Step 1 of Embodiment 1.

[0037] Step 2. Take 10 g of PRSB respectively and dissolve them in 100 mL, 1.5 mol / L FeCl 3 , Fe 2 (SO 4 ) 3 , CaCl 2 solution, after magnetic stirring at room temperature for 1 h, let it stand for 24 h, put it in an oven at 105 °C and dry it to constant weight to obtain acid-washed metal-modified biochar, correspondingly recorded as PRSB-Fe-7.5, PRSB-FS -7.5, PRSB-Ca-7.5 (the number 7.5 indicates the loading of metal elements, mmol / g).

Embodiment 3

[0039] Step 1 is the same as Step 1 of Embodiment 1.

[0040] Step 2, take 10g of PRSB respectively, and dissolve them in 100mL, 0.5mol / LFeCl 3 , Fe 2 (SO 4 ) 3 , CaCl 2 solution, after magnetic stirring at room temperature for 1 h, let it stand for 24 h, put it in an oven at 110 °C and dry it to constant weight to obtain acid-washed metal-modified biochars, which are correspondingly recorded as PRSB-Fe-2.5, PRSB-FS -2.5, PRSB-Ca-2.5 (the number 2.5 represents the loading of metal elements, mmol / g).

[0041] Sample Characterization

[0042] figure 1 (a), (b), (c), (d) correspond to the scanning electron microscope images of RSB, PRSB-Fe, PRSB-FS and PRSB-Ca. From the comparison of the figures, it can be seen that the four materials before modification, PSB The surface is flat and smooth, and the surface of the material is eroded by chemical modification, making the surface of PRSB-Fe-5 rough and the pores dense, while PRSB-FS-5 and PRSB-Ca-5 present a complex and porous...

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Abstract

The invention discloses a modified rice straw biochar adsorbing material, and a preparation method and application thereof. The modified rice straw biochar adsorbing material is formed by loading any one of Fe element, a mixture of Fe and S elements or Ca element on the surface of rice straw biochar. The preparation method comprises the steps: step 1, grinding the rice straw biochar, screening to 20 mesh or less, soaking the rice straw biochar in a diluted hydrochloric acid solution for at least 1 hour, carrying out suction filtration, repeatedly washing with ultrapure water until the rice straw biochar is nearly neutral, putting in a drying oven, and drying until the weight is constant to obtain pickled biochar; and step 2, respectively adding PRSB into FeCl3, Fe2(SO4)3 and CaCl2 solutions, magnetically stirring at room temperature for at least 1 hour, standing, and drying in a drying oven until the weight is constant. The modified rice straw biochar adsorbing material is used for treating manure separation liquid of a septic tank. The modified rice straw biochar adsorbing material provided by the invention greatly improves the adsorption capacity of phosphorus, is applied to enrichment and recovery of phosphorus, and realizes treatment and resource utilization of the manure separation liquid of the septic tank.

Description

technical field [0001] The invention belongs to a biomass adsorption material, and in particular relates to a modified rice straw biochar adsorption material, a preparation method and an application of the adsorption material, which are used for the treatment and recycling of manure and sewage separation fluid in septic tanks. Background technique [0002] At present, there are still many problems in the toilets. In the vast rural areas, especially in the northern rural areas, the collection type dry toilets are still the main ones, which are unqualified and unhygienic. The rural "toilet revolution" faces the main battlefield of the national economy, and it is related to the improvement of the quality of life of hundreds of millions of peasants. my country's implementation of the rural revitalization strategy has further accelerated the "toilet revolution" in rural areas. Septic tanks are currently the main treatment method for rural residents' toilet sewage. However, due t...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C05G1/00
CPCB01J20/20B01J20/06B01J20/046C02F1/283C05B17/00B01J2220/4825B01J2220/42
Inventor 皇甫小留王润之何强郭程晨鲍奕铭何璇曹钰
Owner CHONGQING UNIV