Preparation method of magnetic straw cellulose adsorbent for heavy metal ions

A technology of straw cellulose and heavy metal ions, applied in alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems such as difficult separation and secondary pollution, and achieve improved compatibility and life cycle chain Short, the effect of controlling environmental pollution

Active Publication Date: 2017-11-21
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the straw was pretreated and chemically oxidized to prepare aldehyde-based straw cellulose, and finally KH550 modified magnetic nanoparticles, aldehyde-based straw cellulose, polyethyleneimine and glutaraldehyde were chemically cross-linked to prepare A magnetic straw cellulose / polyethyleneimine heavy metal ion adsorbent with a cross-linked structure and a variety of heavy metal ion adsorption groups. The magnetic nanoparticles are modified by a silane coupling agent to improve the compatibility of the magnetic nanoparticles and the polymer matrix. Inhibit the macro phase separation of magnetic nanoparticles and polymer matrix, realize the efficient magnetic intelligent separation of magnetic straw cellulose / polyethyleneimine heavy metal ion adsorption, and better solve the problem of difficult solid-liquid separation and easy secondary pollution of ordinary adsorbents Shortcomings

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] Cut the cotton stalks into pieces, wash them with deionized water for 3 times, dry them in an oven at 60°C, crush them, and sieve the 100-mesh cotton stalk powder, add 10g of cotton stalk powder and 3g of sodium chlorite to 100mL pH=4.5 acetic acid-sodium acetate buffer solution, heated to 80°C, reacted for 3 hours, cooled to room temperature, filtered, washed with deionized water three times, centrifuged, dried in an oven at 80°C, and crushed to obtain pretreated cotton straw; 10 g of pretreated cotton The straw was added to 100mL NaOH solution with a mass concentration of 10%, heated to 80°C, reacted for 3h, filtered, washed with deionized water three times, and centrifuged to obtain pretreated cotton straw cellulose; 10g of pretreated cotton straw cellulose, Add 5 g of sodium periodate and 100 mL of deionized water into a three-necked flask, raise the temperature to 55° C., react for 2 hours, wash the product with deionized water three times, and centrifuge to obtain ...

Embodiment 2

[0034] Cut the soybean straw into pieces, wash it with deionized water for 5 times, dry it in an oven at 80°C, crush it, and sieve the 200-mesh soybean straw powder, add 15g soybean straw powder and 4g sodium chlorite to 150mL pH=4.8 acetic acid-sodium acetate buffer solution, warming up to 50°C, reacting for 6 hours, cooling to room temperature, filtering, washing with deionized water for 5 times, centrifuging, drying in an oven at 60°C, and crushing to obtain pretreated soybean straw; 30g of pretreated soybean The straw was added to 200mL of NaOH solution with a mass concentration of 10%, heated to 90°C, reacted for 2h, filtered, washed with deionized water for 5 times, and centrifuged to obtain pretreated soybean straw cellulose; 30g of pretreated soybean straw cellulose, Add 10g of sodium periodate and 200mL of deionized water into a three-necked flask, raise the temperature to 60°C, react for 1.5h, wash the product with deionized water for 5 times, and centrifuge to obtain...

Embodiment 3

[0038] Cut sorghum straw into pieces, wash with deionized water for 3 times, dry in an oven at 60°C, crush, sieve 150-mesh sorghum straw powder, add 30g sorghum straw powder and 10g sodium chlorite to 200mL pH=3.5 acetic acid-sodium acetate buffer solution, heated up to 90°C, reacted for 2 hours, cooled to room temperature, filtered, washed 5 times with deionized water, centrifuged, dried in an oven at 80°C, and crushed to obtain pretreated sorghum straw; 15g of pretreated sorghum The straw was added to 150mL of NaOH solution with a mass concentration of 5%, heated to 60°C, reacted for 6h, filtered, washed with deionized water for 5 times, and centrifuged to obtain pretreated sorghum straw cellulose; 20g of pretreated sorghum straw cellulose, Add 8 g of sodium periodate and 150 mL of deionized water into a three-necked flask, raise the temperature to 40° C., react for 3 hours, wash the product with deionized water for 5 times, and centrifuge to obtain aldehyde-based sorghum str...

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Abstract

The invention relates to a preparation method of a magnetic straw cellulose adsorbent for heavy metal ions. The method comprises the following steps: respectively preprocessing straws with sodium chlorite and sodium hydroxide, and oxidizing the pretreated straws with sodium periodate to obtain aldehyde straw cellulose; and preparing magnetic nano-particles by adopting an improved chemical coprecipitation technology, modifying the surfaces of the magnetic nano-particles with a silane coupling agent KH550 to obtain KH550 modified magnetic nano-particles, and carrying out a crosslinking reaction on the KH550 modified magnetic nano-particles, polyethyleneimine and glutaraldehyde to prepare the magnetic straw cellulose adsorbent for heavy metal ions, having a Schiff base crosslinked structure and various adsorption groups. The saturation magnetization intensity of the adsorbent is 10-30 e mu / g, the remanent flux density and the coercive field strength tend to zero, the adsorbent has paramagnetism and magnetic responsibility, the heavy metal ion adsorption capacity reaches 15-250 mg / g, adsorption balancing can be reached in 50-150 min, the heavy metal ion adsorption capacity of the adsorbent which is recycled 5 times exceeds 75% of the first adsorption capacity, and the adsorbent can be widely applied to heavy metal ion adsorption separation and heavy metal ion pollution treatment.

Description

1. Technical field [0001] The invention relates to a preparation method of a magnetic straw cellulose heavy metal ion adsorbent. The magnetic straw cellulose heavy metal ion adsorbent prepared by the invention is suitable for the adsorption and separation of heavy metal ions, and can be widely used in heavy metal ion adsorption, heavy metal ion separation and purification, and Environmental pollution control of heavy metal ions, etc. 2. Background technology [0002] With the improvement of global industrialization, environmental pollution is becoming more and more serious. Among them, water pollution has seriously affected people's production and life. Industrial wastewater is the main source of heavy metal pollution in water bodies. Many industrial processes, such as electroplating, tanning, mining, steelmaking, dyeing, etc. , will produce a large amount of wastewater containing heavy metal ions, such as Cd 2+ 、Cu 2+ , Pb 2+ 、Ni 2+ 、As 3+ , Hg 2+ 、Cr 3+ 、Co 2+ and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
Inventor 万涛陈巧和熊静唐利廖玲王艳芬刘玥莹李明
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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