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Sulfur-nitrogen-doped porous biochar, preparation method and application

A biochar, sulfur and nitrogen technology, applied in chemical instruments and methods, water pollutants, alkali metal compounds, etc., can solve problems such as not being developed and utilized, and achieve good selection and adsorption capacity, high heavy metal ion selective adsorption capacity , the effect of simple operation

Inactive Publication Date: 2018-12-07
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Except for a small amount of bean dregs for food, it is mainly used as feed or fertilizer, and most of them have not been well developed and utilized.

Method used

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  • Sulfur-nitrogen-doped porous biochar, preparation method and application
  • Sulfur-nitrogen-doped porous biochar, preparation method and application
  • Sulfur-nitrogen-doped porous biochar, preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0034] The specific preparation process includes mixing calcium sulfate, potassium oxalate and defatted soybean dregs at a mass ratio of 1:1:1, and the calcination conditions are as follows: heating up to 800°C at a heating rate of 5°C / min under argon gas, heating time 1h, and naturally cooled to room temperature, the obtained product was washed three times with dilute hydrochloric acid, and dried overnight at 60°C to obtain the final product.

[0035] More specifically, the obtained sulfur-nitrogen-doped biochar was added to the heavy metal solution at 0.5 g / L, and the adsorbent was evenly dispersed in the aqueous solution by stirring, and the adsorption was carried out for 120 minutes until the adsorption equilibrium was reached, and the adsorption was separated by centrifugation. The material is separated from the solution, and the separated material is subjected to in-situ reduction treatment of surface heavy metals with 1M sodium borohydride to obtain a biochar-metal nanop...

Embodiment 1

[0040] Example 1: Optimization of preparation conditions for sulfur and nitrogen doped porous biochar

[0041] The preparation process of porous biochar doped with sulfur and nitrogen is mainly to uniformly mix calcium sulfate, potassium oxalate and defatted soybean dregs and perform high-temperature calcination. The defatted soybean dregs used in this experiment contain 85% moisture, 3.0% protein, and 0.5% fat. Carbohydrates (cellulose, polysaccharides, etc.) 8.0%.

[0042] The specific calcination conditions are as follows: under argon gas, the temperature is raised to 800°C at a heating rate of 5°C / min, the heating time is 1h, and it is naturally cooled to room temperature. The obtained product is washed with dilute hydrochloric acid three times, and dried overnight at 60°C to obtain the final product.

[0043] The preparation condition optimization of the preparation method of sulfur and nitrogen doped porous biochar comprises the following steps:

[0044] 1) Auxiliary ad...

Embodiment 2

[0049] Example 2: Adsorption capacity of sulfur and nitrogen doped porous biochar for different heavy metals

[0050] 1) Competitive adsorption capacity of sulfur and nitrogen doped porous biochar in mixed heavy metal ion solution

[0051] The biochar adsorbent was added to a mixture of heavy metal ions at an amount of 0.5 mg / L to test its competitive adsorption capacity. The mixture included seven heavy metal ions lead, copper, nickel, chromium, zinc, manganese, iron and Concentrations were 10ppm, adsorption reaction 10h. After the reaction is completed, the material and the reaction solution are separated by centrifugation, and the supernatant solution is measured by flame atomic absorption, and the distribution coefficient of the biochar material for each ion is calculated using the formula to judge its selective adsorption capacity. The result is as image 3 The a in the figure shows that the partition coefficients of the biochar adsorption material for the heavy metals ...

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Abstract

The invention discloses a sulfur-nitrogen-doped porous biochar, a preparation method and an application. The preparation method uses calcium sulfate as a template, potassium oxalate as an activator and bean fibers as a carbon source, and employs calcination to prepare the sulfur-nitrogen-doped porous biochar. The sulfur-nitrogen-doped biochar is an environment-friendly adsorbent for treating heavymetal wastewaters with low cost and high efficiency, adsorption capacities for Cu<2+> and Ni<2+> ions are substantially superior to other biochars. At the same time, the sulfur-nitrogen-doped biocharcontaining adsorbed heavy metals can be subjected to a reduction treatment, and then the reduction-treated sulfur-nitrogen-doped biochar can be further used for catalytic degradation of pollutants inwater to realize recovery and application of the heavy metals.

Description

technical field [0001] The invention belongs to the field of biochar preparation, and in particular relates to sulfur and nitrogen doped porous biochar, a preparation method and application. Background technique [0002] Biochar is an insoluble, stable, highly aromatized, carbon-rich black fluffy solid substance, which belongs to the category of black carbon, and its constituent elements are mainly carbon, hydrogen, oxygen, nitrogen, etc. The carbon content is above 70%. Biochar has a dense microporous structure and a huge specific surface area. It has strong adsorption capacity and can adsorb heavy metals such as lead, chromium, mercury, cadmium, copper, and zinc. In addition, biochar also has notable characteristics such as low production cost, ecological safety, no pollution, and large-scale promotion. These remarkable features make it an efficient and cheap heavy metal ion adsorbent. [0003] Okara is a by-product in the process of producing soymilk or tofu, which has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J27/24B01J35/10C02F1/28C02F1/72C02F101/20C02F101/30
CPCB01J20/0274B01J20/0285B01J20/20C02F1/281C02F1/283C02F1/725B01J20/28045B01J20/28054B01J27/24C02F2101/308C02F2101/20B01J35/60
Inventor 王建龙王靖杨庆锋杨伟霞张亮张天树张道宏李忠宏
Owner NORTHWEST A & F UNIV
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