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Process for preparing bean skin biosorption

A technology of biosorbent and adsorbent, which is applied in the field of preparation of soybean skin biosorbent, can solve the problems of restricting popularization and application, and achieve the effect of increasing adsorption capacity, high adsorption capacity and increasing strength

Inactive Publication Date: 2007-02-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thereby limiting the popularization and application in industrial water treatment

Method used

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  • Process for preparing bean skin biosorption

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Experimental program
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Effect test

Embodiment 1

[0028] Crush 10g of granular bean curd with particle size ≤ 3mm, add 300ml of 0.05M NaOH solution, mix and pretreat at 60°C for 2 hours, wash the particles with water until neutral. The granular bean curds were transferred into 20 ml of succinic acid solution for modification, the modification concentration was 0.5 M, the modification temperature was 130° C., and the modification was performed for 12 hours. Then move the bean curd to the aqueous solution to rinse until neutral. Dried at 60 °C to dry soybean hull biosorbent. Get 0.2g soybean hull biosorbent and 50ml Pb(NO 3 ) 2 Add the aqueous solution to a 150ml Erlenmeyer flask, and at room temperature, shake at a speed of 150dyn / m for 24 hours (adsorption equilibrium), and measure the metal ion Pb in the solution. 2+ The adsorption capacity is 89mg / g. The experimental results show that the adsorbent can be used in a wide range of pH = 2 to 11; desorb with 20ml of 0.5M hydrochloric acid for 0.5h, wash with water until neu...

Embodiment 2

[0029] The operating methods of embodiment 2, embodiment 3, embodiment 4 and embodiment 5 are the same as embodiment 1, and the operating parameters are shown in table 1.

Embodiment 5

[0031] Crush 10g of granular bean curd with a particle size of ≤5mm, add 200ml of 0.5M KOH solution, mix and pretreat at 40°C for 10 hours, wash the particles with water until neutral. The granular bean curds were transferred into 300ml of acetic acid solution for modification, the modification concentration was 1M, the modification temperature was 40°C, and the modification was performed for 0.5 hours. Then move the bean curd to the aqueous solution to rinse until neutral. Dried at 30 °C to dry soybean hull biosorbent. Get 0.2g soybean hull biosorbent and 50ml Pb(NO 3 ) 2 Add the aqueous solution to a 150ml Erlenmeyer flask, and at room temperature, shake at a speed of 150dyn / m for 24 hours (adsorption equilibrium), and measure the metal ion Pb in the solution. 2+ The adsorption capacity is 93mg / g. The experimental results show that the adsorbent can be used in a wide range of pH = 2 to 11; then use 0.8M citric acid 100ml to desorb for 8 hours, wash with water until neutr...

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Abstract

The invention relates to a method for preparing beam biological absorber, which can remove and recycle heave metal ion, wherein it directly uses beam as water processing agent, with low mechanical strength and easy broken, and the adsorption capacity can reach 30mg / g; and the invention comprises: breaking the beam, selecting the ones whose diameter is lower than 5mm; adding alkali liquor at 10-80Deg. C to be pretrated for 0.5-24 hours; the amount of alkali liquor and bema are 2-30ml / g; the density of alkali liquor is 0.01-1M; washing it with water to neutral; adding organic acid solution to be modified; the density of organic acid density is 0.05-1M, at 30-130Deg. C; the amount ratio between organic acid and beam is 2-30ml / g, to be modified for 0.5-12 hours; washing it to neutral and drying at 20-80Deg. C. The inventive absorber can be deabosrbed via diluted acid at 0.02-1M; then regenerated via 0.005-1M diluted acid to be used again. The invention has low cost, while the adsorption capacity can reach 60-200mg / g, without secondary pollution.

Description

technical field [0001] The invention relates to a preparation method of a soybean skin biosorbent, which belongs to the field of biosorbents. The soybean skin is a by-product of the soybean processing industry. The soybean hull biosorbent can be applied to the removal of heavy metal ions and the recovery of precious metals. Background technique [0002] There are a variety of heavy metal ions in electroplating wastewater, dye wastewater, tannery wastewater, and metallurgical wastewater. The pollution of these wastewaters has been paid more and more attention. At present, the commonly used treatment methods for this type of wastewater containing various heavy metal ions include chemical treatment, ion exchange, adsorption separation, membrane separation, and microbial methods. These methods are more effective in treating solutions containing high concentrations of heavy metal ions. Good, but there are certain defects when dealing with trace heavy metal ions, such as complex ...

Claims

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Application Information

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IPC IPC(8): B01J20/24
Inventor 苏海佳李嘉谭天伟
Owner BEIJING UNIV OF CHEM TECH
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