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.
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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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