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Application of biological adsorbing agent

A biological adsorbent and application technology, applied in the direction of adsorption of water/sewage treatment, water pollutants, special compound water treatment, etc., can solve the problem that the filtrate is not fully utilized, and achieve waste reduction, good adsorption performance, and simple operation Effect

Inactive Publication Date: 2015-04-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical modification method of citric acid to biomass is generally obtained through solid-liquid contact, filtration, drying and other treatments to obtain modified biosorbents, but the filtrate after modification is generally not fully utilized, and so far no modification of biomass has been reported. Relevant literature reports on the utilization of filtrate

Method used

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  • Application of biological adsorbing agent
  • Application of biological adsorbing agent
  • Application of biological adsorbing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The tea dregs discarded in the beverage production factory are recovered, washed in hot water, dried in an oven at 80°C to constant weight, then crushed and sieved. Take 60-200 mesh tea residue powder, add it to 0.1mol / L citric acid solution, the solid-to-liquid ratio is 1:50 (g:mL), soak for 24 hours, then raise the temperature to 120°C under continuous stirring, and continue for 90 minutes, naturally Cool to room temperature, and the filtrate obtained by suction filtration is the filtrate produced by citric acid modified tea dregs.

[0034] Take 300 mL of the above filtrate, add 3.0 g of chitosan, and continue to stir at 50 ° C for 4 h, then adjust the pH value to 8 with 1 mol / L NaOH solution during stirring, and then continue to stir for 1 h; filter and wash after natural cooling, the obtained The solid particles are oven-dried and pulverized at 50°C to make the biosorbent.

[0035] figure 1 The scanning electron micrograph of the biosorbent prepared for the presen...

Embodiment 2

[0037] The discarded bamboo shoot shells from the bamboo shoot processing factory were recovered, washed to remove the surface dust, dried in an oven at 80°C to constant weight, and then crushed and sieved. Take bamboo shoot shell powder of 40-200 mesh, add it to 0.5mol / L citric acid solution, the solid-to-liquid ratio is 1:100, after immersing for 6 hours, heat up to 80°C under continuous stirring, and continue for 90 minutes, and naturally cool to room temperature. The filtrate obtained by suction filtration is the filtrate produced by citric acid modified bamboo shoot shells.

[0038] Take 300mL of the above filtrate, add 6.0g chitosan, continue stirring at 80°C for 4h, then adjust the pH value to 8 with 1mol / L NaOH solution during stirring, and continue stirring for 1h; Wash with ionic water until the pH is constant, filter and wash after natural cooling, and dry and pulverize the obtained solid particles in an oven at 50°C to prepare the biosorbent.

[0039] figure 2 T...

Embodiment 3

[0041] The discarded citrus peel residue after pectin extraction in pectin factory is recovered, washed and dried in an oven at 80°C to constant weight, then crushed and sieved. Take 40-200 mesh citrus peel powder and add it to 1.0mol / L citric acid solution with a solid-to-liquid ratio of 1:80. After soaking for 15 hours, raise the temperature to 100°C under continuous stirring for 90 minutes, and let it cool naturally to room temperature. , the filtrate obtained by suction filtration is the filtrate produced by citric acid modified citrus peel.

[0042] Take 300 mL of the above filtrate, add 4.5 g of chitosan, continue to stir at 60 ° C for 4 h, then adjust the pH value to 9 with 1 mol / L NaOH solution during stirring, and then continue to stir for 1 h; filter and wash after natural cooling, the obtained The solid particles are oven-dried and pulverized at 50°C to make the biosorbent.

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Abstract

The invention provides application of a biological adsorbing agent, and relates to application of the biological adsorbing agent in preparation of the biological adsorbing agent for heavy metals and dyeing waste water. A preparation method of the biological adsorbing agent comprises the steps of washing a biomass raw material, drying, crushing and screening to obtain biomass powder; mixing, impregnating, heating and stirring citric acid solution and the biomass powder to obtain a solid-liquid mixture; carrying out suction filtration on the solid-liquid mixture and collecting filtrate; mixing the filtrate with chitosan, heating, stirring, adjusting the pH value to be 8-10, dissolving out solids, stirring continuously, cooling, performing suction filtration, and washing to be neutral to obtain neutral filter residues; and drying and crushing the neutral filter residues to obtain the biological adsorbing agent. The biological adsorbing agent can be applied to preparation of the biological adsorbing agent of heavy metals and dyeing waste water, the operation is simple, the application range is wide, acid treatment waste liquid of multiple forestry and agricultural residue biomasses can be prepared into the effective and cheap adsorbing agent for heavy metals and dyeing waste water by the method.

Description

technical field [0001] The invention relates to a biosorbent, in particular to the use of a biosorbent in the preparation of heavy metal and dye wastewater biosorbents. Background technique [0002] Since the 20th century, with the development of modern industry, the pollution of water resources by heavy metals and dyes has become a major environmental problem that needs to be solved urgently. The content of heavy metals in natural water is very small, and the heavy metals in polluted water mainly come from industrial sectors such as mining, electroplating, and chemical industry. Excessive heavy metals accumulate in the human body, which can cause vomiting, headache, dizziness, dyspnea and even life-threatening; excessive heavy metals can also endanger the normal growth of most plants and destroy the osmotic adjustment of aquatic animals. It is estimated that 40,000 to 80,000 tons of dyes are discharged into rivers, lakes, seas, and surface waters as wastewater every year d...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62C02F1/58
CPCB01J20/24B01J20/3085B01J2220/44B01J2220/4875C02F1/285C02F2101/20C02F2101/308C02F2103/14C02F2305/04
Inventor 叶李艺周儒森罗智明王帅庄灿峰张敬苗
Owner XIAMEN UNIV
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