A kind of preparation method of polyacrylic acid composite aluminum modified bentonite water treatment agent which absorbs Cr(VI)

A polyacrylic acid aluminum, water treatment agent technology, applied in the direction of adsorption water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of difficult solid-liquid separation, small adsorption capacity of chromium anions, etc. Achieve the effects of abundant resources, easy solid-liquid separation, and reduced processing costs

Inactive Publication Date: 2021-08-24
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a polyacrylic acid composite aluminum that absorbs Cr(VI) in order to overcome the problems such as the small amount of adsorption of chromium anions and the difficulty of solid-liquid separation in Cr(VI)-containing wastewater by natural calcium-based bentonite in the prior art. Preparation method of modified bentonite water treatment agent

Method used

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  • A kind of preparation method of polyacrylic acid composite aluminum modified bentonite water treatment agent which absorbs Cr(VI)
  • A kind of preparation method of polyacrylic acid composite aluminum modified bentonite water treatment agent which absorbs Cr(VI)
  • A kind of preparation method of polyacrylic acid composite aluminum modified bentonite water treatment agent which absorbs Cr(VI)

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Embodiment 1

[0030] Embodiment 1: the specific operations are as follows

[0031] (1) The natural calcium-based bentonite is purified by a wet purification method, ground and sieved with 200 mesh (75 μm) for subsequent use;

[0032] (2) Configure AlCl with a mass concentration of 10g / L 3 Solution, the purified calcium-based bentonite and AlCl 3 The solutions were mixed, stirred electrically at room temperature for 2 hours, left to stand overnight, suction filtered, and dried to obtain aluminum-modified bentonite, which was ground and passed through a 200-mesh (75 μm) sieve for later use;

[0033] Wherein, the mass ratio is calcium-based bentonite: AlCl 3 Solution = 1:10;

[0034] (3) Configure an aqueous solution of acrylic acid with a volume fraction concentration of 50%, add an appropriate amount of NaOH for neutralization, and configure an acrylic acid-sodium acrylate solution with a neutralization degree of 20%;

[0035] (4) Mix aluminum-modified bentonite, acrylic acid-sodium acry...

Embodiment 2

[0042] Embodiment 2: specific operation is as follows

[0043] (1) The natural calcium-based bentonite is purified by a wet purification method, ground and sieved with 200 mesh (75 μm) for subsequent use;

[0044] (2) Configure AlCl with a mass concentration of 10g / L 3 Solution, the purified calcium-based bentonite, AlCl 3 The solutions were mixed, stirred electrically at room temperature for 2 hours, left to stand overnight, suction filtered, and dried to obtain aluminum-modified bentonite, which was ground and passed through a 200-mesh (75 μm) sieve for later use;

[0045] Among them, the mass ratio is calcium-based bentonite: AlCl 3 Solution = 1:10;

[0046] (3) Configure an aqueous solution of acrylic acid with a volume fraction concentration of 50%, add an appropriate amount of NaOH for neutralization, and configure an acrylic acid-sodium acrylate solution with a neutralization degree of 20%;

[0047] (4) Mix aluminum-modified bentonite, acrylic acid-sodium acrylate s...

Embodiment 3

[0054] Embodiment 3: specific operations are as follows

[0055] (1) The natural calcium-based bentonite is purified by a wet purification method, ground and sieved with 200 mesh (75 μm) for subsequent use;

[0056] (2) Configure AlCl with a mass concentration of 10g / L 3 Solution, the purified calcium-based bentonite, AlCl 3 The solutions were mixed, stirred electrically at room temperature for 2 hours, left to stand overnight, suction filtered, and dried to obtain aluminum-modified bentonite, which was ground and passed through a 200-mesh (75 μm) sieve for later use;

[0057] Among them, the mass ratio is calcium-based bentonite: AlCl 3 Solution = 1:10;

[0058] (3) Configure an aqueous solution of acrylic acid with a volume fraction concentration of 50%, add an appropriate amount of NaOH for neutralization, and configure an acrylic acid-sodium acrylate solution with a neutralization degree of 20%;

[0059] (4) Mix aluminum-modified bentonite, acrylic acid-sodium acrylate...

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Abstract

The invention relates to a preparation method of a polyacrylic acid composite aluminum modified bentonite water treatment agent adsorbing Cr(VI). In this method, AlCl is firstly applied to natural calcium-based bentonite. 3 Solution modification, followed by acrylic acid aqueous solution polymerization, and finally configuring different concentrations of cetyltrimethylammonium bromide (CTMAB) solutions, adding polyaluminum acrylate modified bentonite, to obtain increased interlayer spacing, which is not easy to dissociate And the polyacrylic acid composite aluminum modified bentonite water treatment agent with enhanced Cr(VI) adsorption capacity. The invention not only solves the problem of solid-liquid separation of the water treatment agent and the wastewater solution after the wastewater treatment process, but also provides a new way for the adsorption of chromium anions in Cr(VI)-containing wastewater by bentonite.

Description

technical field [0001] The invention relates to a preparation method of a polyacrylic acid composite aluminum modified bentonite water treatment agent which absorbs Cr(VI). Background technique [0002] Chromium is a common heavy metal pollutant, mainly including trivalent chromium (Ⅲ) and hexavalent chromium (VI). Due to its higher solubility and mobility in the environment, Cr(VI) is highly toxic and carcinogenic compared to Cr(III), an essential trace element for mammals . In aqueous solution, Cr(VI) is often represented as chromate (CrO 4 2－ ), hydrogen chromate (HCrO 4 - ), dichromate (Cr 2 o 7 2－ ) and hydrogen dichromate (HCr 2 o 7 - ) form exists. These chromium anions are produced from effluents from the paint, pigment, leather manufacturing, chrome plating and paper industries. Cr(VI) ions have carcinogenic, mutagenic and teratogenic effects. Therefore many treatment techniques, such as chemical precipitation, ion exchange, membrane separation, electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/12C02F1/28C02F101/22
Inventor 曹吉林王爽赵斌谭朝阳刘秀伍张广林
Owner HEBEI UNIV OF TECH
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