Modified preparation method for corn straw capable of adsorbing arsenic in water

A technology for absorbing water from corn stalks, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of unused straw, environmental pollution, waste of resources, etc., and achieve low price, Raw materials are readily available and easy to handle

Inactive Publication Date: 2014-12-24
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] my country is a large agricultural country with abundant crop straw resources, among which the annual output of corn straw reaches hundreds of millions of tons, but at present these straws are not properly utilized, and most of them are randomly discarded in the farmland or burned on the spot, which not only causes a waste of resources , also cause environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Remove the middle section from the air-dried corn stalks, cut them into short stalks, wash and dry to constant weight, then remove the hard skin on the surface, and cut them into straw particles with a diameter of 0.8~1.2cm;

[0025] (2) Soak the above-mentioned straw particles in isopropanol with a volume concentration of 0.8% for 9 hours, take them out, wash them with deionized water, and dry them;

[0026] (3) Soak the straw particles dried in step (2) in NaOH solution with a concentration of 0.8mol / L for 8 hours, take it out and wash it repeatedly with deionized water for 3 to 5 times, so that the pH value is neutral and then dried at 77°C;

[0027] (4) Soak the straw particles dried in step (3) in oxalic acid with a concentration of 0.22mol / L for 6 hours, take it out, wash it with deionized water, and dry it to obtain the modified corn straw Adsorbent.

[0028] Use the above-mentioned modified corn stalks to adsorb arsenic in water, adjust the pH of the arsen...

Embodiment 2

[0031] (1) Remove the middle section of the air-dried corn stalks, cut them into short stalks, wash and dry them to constant weight, then remove the hard skin on the surface, and cut them into straw particles with a diameter of 1.8~1.2cm;

[0032] (2) Soak the above-mentioned straw particles in isopropanol with a volume concentration of 1.2% for 10 hours, take them out, wash them with deionized water, and dry them;

[0033] (3) Soak the dried straw particles in step (2) in a NaOH solution with a concentration of 1.0mol / L for 7 hours, take it out and wash it repeatedly with deionized water for 3 to 5 times, so that the pH value is neutral. and then dried at 73°C;

[0034] (4) Soak the straw particles dried in step (3) in oxalic acid with a concentration of 0.18mol / L, soak for 7 hours, take it out, wash it with deionized water, and dry it to obtain the modified corn straw Adsorbent.

[0035] Use the above-mentioned modified corn stalks to adsorb arsenic in water, adjust the pH...

Embodiment 3

[0038] (1) Remove the middle section of the air-dried corn stalks, cut them into short stalks, wash and dry them to constant weight, then remove the hard skin on the surface, and cut them into straw particles with a diameter of 1.8~1.2cm;

[0039] (2) Soak the above-mentioned straw particles in isopropanol with a volume concentration of 1.0% for 8 hours, take them out, wash them with deionized water, and dry them;

[0040] (3) Soak the dried straw particles in step (2) in a NaOH solution with a concentration of 1.2mol / L for 6 hours, take it out and wash it repeatedly with deionized water for 3 to 5 times, so that the pH value is neutral. and then dried at 75°C;

[0041](4) Soak the straw particles dried in step (3) in oxalic acid with a concentration of 0.2mol / L, soak for 8 hours, take it out, wash it with deionized water, and dry it to obtain the modified corn straw Adsorbent.

[0042] Use the above-mentioned modified corn stalks to adsorb arsenic in water, adjust the pH of...

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Abstract

The invention belongs to the field of environmental protection and particularly relates to a modified preparation method for a corn straw capable of adsorbing arsenic in water. Middle nodules of the air-dried corn straw are removed, the corn straw is cut into short sticks, the short sticks are washed and dried to reach constant weight, the hard barks on the surfaces are removed, the short sticks are cut into straw particles, the straw particles are soaked in isopropyl alcohol for 8-10 hours, washed with deionized water and dried, then the processed straw particles are soaked in a NaOH solution with the concentration of 0.8-1.2mol / L for 6-8 hours, washed with deionized water and dried, then the processed straw particles are soaked in oxalic acid with the concentration of 0.18-0.22mol / L, washed with deionized water, and dried, so as to finally obtain a modified corn straw adsorbent, wherein the maximum saturated adsorption is up to 94[mu]gAs(III) / g (straw). The materials are easy to get, the cost is low, the toxicity is low, the modified method is simple in operation steps, the conditions are easy to achieve, high temperature or high pressure is not needed, the method is easy to realize, and the arsenic adsorption effect of the modified corn straw is good.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a modification preparation method of corn stalks used for absorbing arsenic in water. Background technique [0002] In many parts of the world, the arsenic content in groundwater and surface water exceeds the standard. Among them, Bangladesh, India, Thailand and Taiwan are the most serious countries and regions in Asia. In my country, areas with serious arsenic poisoning are mainly distributed in Shanxi, Inner Mongolia, Xinjiang, Ningxia and other provinces (autonomous regions). According to the survey results of the Ministry of Water Resources, the National Development and Reform Commission, and the Ministry of Health on 2,674 county-level units in my country from November 2004 to June 2005, the number of people drinking water with excessive arsenic in rural areas nationwide is 2.89 million, distributed in 23 provinces , autonomous regions, and municipalities ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/58
Inventor 范荣桂赵晓亮董雪姜清凤郜秋平戴艺张世强王全程王建
Owner LIAONING TECHNICAL UNIVERSITY
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