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Adsorbent for simultaneously removing heavy metals and phenol organics in mineral processing wastewater and preparation method thereof

An adsorbent, heavy metal technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problem of bentonite stability, long-term performance and ability to withstand slightly higher temperatures, and it is difficult to remove inorganic substances. The adsorption effect of pollutants and organic pollutants is not very ideal, so as to achieve the effect of not easy precipitation, low foam capacity, and convenient direct recovery.

Inactive Publication Date: 2012-07-18
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two types of modification methods commonly used at present have their advantages and disadvantages respectively: the organobentonite modified with quaternary ammonium cationic surfactant has better performance in adsorbing organic pollutants, but it is difficult to remove inorganic pollutants; Inorganic pillared bentonite modified by metal polycations can effectively adsorb inorganic pollutants such as heavy metals, but the adsorption effect on organic pollutants is not very satisfactory
However, the stability, long-term effect and ability to withstand slightly high temperature of bentonite modified by quaternary ammonium salt surfactant and chelating agent are still insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 (comparison):

[0032] Modified bentonite (MB, modified Bentonite) with different amounts of surfactant hexadecyldimethylbenzyl ammonium chloride (HDBAC), with phenol as the representative of phenolic organic compounds, investigated the surfactant The effect of loading on the adsorption effect.

[0033] In each case, 10 g of bentonite raw soil (its cation exchange capacity 1.06 mmol / 100 g) that was dried and pulverized through a 100 mesh sieve was added to five surfactant solutions of 100 ml respectively (containing 0.858, 1.716, 0.858, 1.716, 2.574, 3.432, 4.290g cetyl dimethyl benzyl ammonium chloride, respectively equivalent to 0.2, 0.4, 0.6, 0.8, 1.0 times the bentonite cation exchange capacity), stirred at room temperature for 24h, added 10ml of four Ethylene pentamine (TEPA), continue to stir for 24 hours, wash and filter, then dry at 60°C, grind through a 100-mesh sieve, and place the prepared chelated pillared organic bentonite (abbreviated as orga...

Embodiment 2

[0036] Hexadecyl dimethyl benzyl ammonium chloride (HDBAC), hexadecyl trimethyl ammonium bromide (HTAB), benzyl trimethyl ammonium chloride (BTMA), hexadecyl triphenyl Bentonite was modified by five kinds of surfactants, tetrabutylphosphorus bromide (TBP or CTPhPBr), tetrabutylphosphorus bromide (PX4B), and chelating agent tetraethylenepentamine (TEPA). Phenol was used as the representative of phenolic organic compounds, and three comparisons were made. Phenol removal effect of a kind of chelated pillared organobentonite.

[0037] In each case, 10g of bentonite raw soil that was dried and crushed through a 100 mesh sieve was added to five surfactant solutions of 100ml respectively (each solution contained HDBAC 3.432g, HTAB 3.161g, BTMA 2.056g, TBP 4.922g, PX4B 2.943g, both equivalent to 0.8 times the cation exchange capacity of bentonite), stirred at room temperature for 24h, added 10ml of TEPA respectively, continued to stir for 24h, washed and filtered, dried at 60°C, and g...

Embodiment 3

[0040] On the basis of organic modification with hexadecyl dimethyl benzyl ammonium chloride (HDBAC), 10ml of three chelating agents tetraethylenepentamine (TEPA), triethylenetetramine (TETA) and ethylenediamine were added. Amines (En), with Cd 2+ As a representative of heavy metals, compare the effect of organoclays prepared by three different methods on Cd 2+ removal effect.

[0041] In each case, 10 g of bentonite raw soil that was dried and crushed through a 100-mesh sieve was added to three parts of HDBAC solutions of 100 ml (containing 3.432 g of HDBAC in the solution, which is equivalent to 0.8 times the cation exchange capacity of bentonite). Stir at 25°C for 24 hours, then add 10ml of the above three chelating agents, continue to stir for 24 hours, wash and filter, then dry at 60°C, grind through a 100-mesh sieve, and put the three organic soils in a desiccator for later use.

[0042] Add 20ml of Cd with a concentration of 50mg / L to three 25ml centrifuge tubes 2+ s...

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PUM

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Abstract

The invention discloses an adsorbent for simultaneously removing heavy metals and phenol organics in wastewater. The adsorbent is obtained by modifying bentonite with a quaternary phosphonium salt cationic surfactant and a chelating agent. The invention also discloses a preparation method of the adsorbent. The preparation method comprises the following steps of: 1) throwing the surfactant into water and heating and stirring the surfactant until the surfactant is completely dissolved; 2) throwing original bentonite into the solution and stirring the original bentonite under room temperature; 3) adding the chelating agent and continuing stirring under room temperature; and 4) drying the product after washing and filtering, grinding and sieving the product with a 100-mesh sieve and placing the obtained product in a dryer under room temperature for later use. The adsorbent and the preparation method have the following advantages that the quaternary phosphonium salt cationic surfactant is firstly exchanged into interlayers of bentonite and the chelating agent also enters the interlayers through hydrophobic bond of the cationic surfactant, thus enlarging the layer distances and ensuring the interlayers to have hydrophobicity and enhancing adsorption of the phenol organics; meanwhile, the chelating agent and the heavy metals form coordination complexes; the adsorbent has a good effect on simultaneously removing heavy metals and phenol organics in mineral processing wastewater; and the removal rates of Cd2<+> and phenol organics in the actual mineral processing wastewater are respectively 88.1% and 99.9%.

Description

technical field [0001] The invention belongs to the field of clay mineral processing and utilization, and in particular relates to an adsorbent for simultaneously removing heavy metals and phenolic organic matter in mineral processing wastewater and a preparation method thereof. Background technique [0002] Since entering the 21st century, my country's non-ferrous metal industry has been further developed, and its industrial scale has jumped to the first in the world. In the production process of non-ferrous metal smelting, besides the waste water from metal beneficiation-smelting contains a large amount of heavy metal compounds, due to the use of a large amount of xanthate and black powder in the production process, various organic and inorganic flotation agents are used in ore flotation. The selected chemicals are easy to form organic substances such as phenols after conversion, so the discharged wastewater often contains pollutants such as heavy metals and phenolic organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/58C02F1/62
Inventor 葛飞黄珂朱润良莫晓余刘汉阳
Owner XIANGTAN UNIV
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