Preparation method for processing wastewater adsorbing material containing lead

An adsorption material and wastewater technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of high price, large usage, low adsorption rate, etc., and achieve high adsorption selectivity, Effect of extended service life and high porosity

Inactive Publication Date: 2012-09-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the traditional methods for removing lead ions include precipitation method, coagulant method, ion exchange method, chemical oxidation met

Method used

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  • Preparation method for processing wastewater adsorbing material containing lead
  • Preparation method for processing wastewater adsorbing material containing lead
  • Preparation method for processing wastewater adsorbing material containing lead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 0.66 g of chitosan and 0.10 g of lead chloride with an electronic balance, and dissolve them in a mixed solvent of 20 ml of trifluoroacetic acid and 2 ml of dichloromethane, and magnetically stir for 24 hours to obtain a spinning solution of chitosan. Then add the spinning stock solution to a 20 ml syringe, adjust the flow rate to 0.8 ml / h by a micro syringe pump, use 8 # needle as the spinneret, use aluminum foil as the receiving device, and ground the aluminum foil. The receiving distance between the needle and the aluminum foil is 9 cm, and a voltage of 18 kV is applied for spinning. The nanofiber felt obtained by electrospinning was placed in a closed glass container containing 3 ml of glutaraldehyde, and cross-linked in glutaraldehyde steam at 20°C for 48 hours. The cross-linked chitosan nanofiber mat was washed with 1 mol / L EDTA solution to obtain a lead ion imprinted cross-linked chitosan nanofiber adsorption material.

Embodiment 2

[0032] Weigh 1.00 g of chitosan and 0.10 g of lead nitrate with an electronic balance, and dissolve them in a mixed solvent of 20 ml of trifluoroacetic acid and 2 ml of ioverol, and magnetically stir for 24 hours to obtain a spinning solution of chitosan. Then add the spinning stock solution to a 20 ml syringe, adjust the flow rate to 1.6 ml / h by the micro-injection pump, use the 9 # needle as the spinneret, use the aluminum foil as the receiving device, and the aluminum foil to ground. The receiving distance between the needle and the aluminum foil is 9 cm, and a voltage of 22 kV is applied for spinning. The nanofiber felt obtained by electrospinning was placed in a closed glass container containing 3ml of glyoxal, and cross-linked in glyoxal steam at 30°C for 24 hours. The cross-linked chitosan nanofiber felt was washed with 1 mol / L HCl solution to obtain a lead ion imprinted cross-linked chitosan nanofiber adsorption material.

Embodiment 3

[0034] Weigh 1.32 g of chitosan and 0.16 g of lead chloride with an electronic balance, dissolve them in a mixed solvent of 30 ml of dimethylformamide and 3 ml of dichloromethane, and magnetically stir for 24 hours to obtain a spinning solution of chitosan. Then add the spinning stock solution to a 20 ml syringe, adjust the flow rate to 1.0 ml / h by a micro syringe pump, use a 10 # needle as a spinneret, use aluminum foil as a receiving device, and ground the aluminum foil. The receiving distance between the needle and the aluminum foil is 10 cm, and a 25 kV voltage is applied for spinning. The nanofiber felt obtained by electrospinning was placed in a closed glass container containing 3ml of formaldehyde, and crosslinked in formaldehyde vapor at 40°C for 24h. The cross-linked chitosan nanofiber membrane was washed with 1 mol / L EDTA to obtain a lead ion imprinted cross-linked chitosan nanofiber adsorption material.

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Abstract

The invention belongs to the field of high polymer material and environmental protection technology, and particularly relates to a preparation method of a lead ion imprinting crosslinking chitosan nanofiber adsorbing material applied to the wastewater containing lead. The method comprises the following steps of: preparing spinning solution by mixing the solution of chitosan and lead chloride and the solution of trifluoroacetic acid and dichloromethane according to a certain proportion; preparing the chitosan nanofiber adsorbing material by using an electrospinning process;and removing chelate ions by crosslinking agent crosslinking and solution washing treatments to obtain the lead ion imprinting crosslinking chitosan nanofiber adsorbing material. Lead ion adsorption experiments show that the adsorption amount of the adsorbing material for lead ions in the wastewater containing lead can reach 500-700mg/g, and the adsorption amount is far better than that of the traditional adsorbing material; and the preparation method of the absorbing material is simple and practical and has good promotional value.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and environmental protection, and in particular relates to a preparation method of an adsorption material for treating lead-containing wastewater. Background technique [0002] Lead ions in wastewater mainly come from the mining, smelting and industrial production of lead mines. When the lead content in wastewater reaches 0.1mg / L, it can inhibit the self-purification of water and bring destructive effects on the natural environment. In addition, excessive lead will affect the normal functions of the human kidney, hematopoietic system, and brain. Therefore, the wastewater solution containing heavy metal lead ions cannot be discharged directly, and certain technical means need to be taken to treat the wastewater before it is discharged. [0003] At present, the traditional methods for removing lead ions include precipitation method, coagulant method, ion exchange method, chemical oxidatio...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/26C02F1/28C02F1/62
Inventor 李岩仇天宝
Owner TONGJI UNIV
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