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首页> 外文期刊>Clays and clay minerals >THE TRAPPING OF B FROM WATER BY EXFOLIATED AND FUNCTIONALIZED VERMICULITE
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THE TRAPPING OF B FROM WATER BY EXFOLIATED AND FUNCTIONALIZED VERMICULITE

机译：功能化AND石从水中捕获B

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摘要

Micron-grade natural vermiculite was modified by several physical and chemical treatments in order to increase the adsorption capacity of this material for B. A thermal exfoliation (T - 600℃) of pristine material, a chemical exfoliation through reaction with hydrogen peroxide (H_2O_2 35%), or grafting of a specific B complexant (i.e. N-methyl-D-glucamine: NMDG) led to an increase in the uptake of B at low initial concentrations of the aqueous solutions ([B] ≈ 5 mg L~(-1)). The more efficient material is the NMDG-grafted clay, for which the adsorption uptake is four times greater than that of raw vermiculite, and reaches 0.04 mmol g~(-1). For all modified materials, the effect of the pH on B adsorption and the adsorption kinetics were studied and compared to raw vermiculite. Adsorption isotherms were also plotted and fitted well with the Freundlich equation.
机译：微米级天然ver石经过多种物理和化学处理，以提高该材料对B的吸附能力。原始材料的热剥落（T-600℃），与过氧化氢（H_2O_2 35）反应的化学剥落％），或接枝特定的B络合剂（即N-甲基-D-葡糖胺：NMDG）导致在低初始水溶液浓度下[B]≈5 mg L〜（- 1））。最有效的材料是NMDG接枝的粘土，其吸附吸收率是原始ver石的四倍，达到0.04 mmol g〜（-1）。对于所有改性材料，研究了pH对B吸附和吸附动力学的影响，并将其与粗raw石进行了比较。还绘制了吸附等温线，并与Freundlich方程很好地拟合。

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