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

4 Cites 2 Cited by

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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, b...

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.

Application Domain

Other chemical processesWater treatment compounds +3

Technology Topic

ChemistryAgricultural residue +9

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Examples

Experimental program(7)

Example Embodiment

[0032] Example 1

[0033] The waste tea residues from beverage production plants are recycled, washed in hot boiling water, dried in an oven at 80°C to a constant weight, then crushed and sieved. Take 60-200 mesh tea dregs powder, add it to 0.1mol/L citric acid solution, solid-liquid ratio is 1:50 (g:mL), after immersing for 24h, heat up to 120℃ under continuous stirring condition, and continue for 90min, natural After cooling to room temperature, the filtrate obtained by suction filtration is the filtrate produced by citric acid modified tea residue.

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

[0035] figure 1 This is the scanning electron micrograph of the biosorbent prepared in Example 1, image 3 Scanning electron micrograph of chitosan used for blending and compounding with citric acid modified biomass filtrate. versus image 3 It can be seen from the comparison that the surface of chitosan and the active ingredients of the filtrate is more rough after being compounded with more multi-void structure, which is an adsorbent with better structural performance.

Example Embodiment

[0036] Example 2

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

[0038] Take 300mL of the above filtrate, add 6.0g chitosan, keep stirring at 80℃ for 4h, then adjust the pH value to 8 with 1mol/L NaOH solution during stirring, and continue to stir for 1h; after natural cooling, filter with suction and use it. The ionized water is washed until the pH is constant, filtered and washed after natural cooling, and the obtained solid particles are dried and crushed in an oven at 50° C. to prepare the biosorbent.

[0039] figure 2 This is the scanning electron micrograph of the biosorbent prepared in Example 2. image 3 Scanning electron micrograph of chitosan used for blending and compounding with citric acid modified biomass filtrate. versus image 3 The comparison shows that the chitosan has a richer fold structure on the surface after being compounded with the active ingredients of the filtrate, and it is also an adsorbent with better structural performance.

Example Embodiment

[0040] Example 3

[0041] The waste citrus peel residues after the pectin is extracted from the pectin factory are recovered, washed and dried in an oven at 80°C to a constant weight, then crushed and sieved. Take 40-200 mesh citrus peel powder, add it to 1.0mol/L citric acid solution, solid-liquid ratio is 1:80, after immersing for 15h, heat up to 100℃ under continuous stirring conditions, and continue for 90min, and cool to room temperature naturally The filtrate obtained by suction filtration is the filtrate produced by citric acid modified citrus peel.

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

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Phenobarbital molecular imprinted polymer and application of phenobarbital molecular imprinted polymer serving as solid-phase extractant

InactiveCN102477137AEasy to prepareGood adsorption performance

Owner:INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY

Classification and recommendation of technical efficacy words

Good adsorption performance

Application of biological adsorbing agent

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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