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首页> 外文期刊>African Journal of Biotechnology >Heavy metal removal from aqueous solutions by sorption using natural clays from Burkina Faso
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Heavy metal removal from aqueous solutions by sorption using natural clays from Burkina Faso

机译：使用布基纳法索的天然粘土通过吸附从水溶液中去除重金属

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摘要

The acid-base properties of two raw and purified mixed clays from Burkina Faso were studied, as well as their potential to remove copper(II), lead(II) and chromium(III), and thereby their ability to be used to purify water from heavy metals. The purification procedure of the clays involved removal of carbonates, iron oxides and organic matter. A determination of the elemental composition of the mixed clays revealed the presence of aluminum, iron and silicon as main constituents. The high alkaline pH in one of the samples is attributable to the presence of carbonate in the raw clay. The point of zero charge (pHpzc) values of the clays, as determined by potentiometric titrations, were 6.79 and 9.52 for the raw clays, while after purification they were 6.87 and 6.76, respectively. Metal adsorption to the clay surfaces started at pH values below pHpzc, strongly indicating formation of inner-sphere complexes. With contact time of 48 h, complete removal of copper(II) was achieved at pH 8 for all samples. More than 90% of the lead(II) removal was attributed to adsorption while for chromium(III), it was 85%. Adsorption to organic matter and iron oxides, and precipitation of metal hydroxides gave significant contributions to the removal of metal ions in aqueous systems.
机译：研究了两种来自布基纳法索的粗制和纯制混合粘土的酸碱性质，以及它们去除铜（II），铅（II）和铬（III）的潜力，从而具有净化水的能力。重金属。粘土的纯化过程包括去除碳酸盐，氧化铁和有机物。对混合粘土的元素组成的测定表明存在铝，铁和硅作为主要成分。其中一个样品中的高碱性pH值归因于原始粘土中碳酸盐的存在。通过电位滴定法确定的粘土的零电荷点（pHpzc）值对于原始粘土为6.79和9.52，而在纯化后，它们分别为6.87和6.76。金属对粘土表面的吸附始于低于pHpzc的pH值，强烈表明形成了内球络合物。在48小时的接触时间下，所有样品在pH 8时都可以完全去除铜（II）。超过90％的铅（II）去除归因于吸附，而铬（III）则为85％。吸附到有机物和氧化铁上，以及金属氢氧化物的沉淀对去除水性系统中的金属离子做出了重大贡献。

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