用原生物质和改性生物质材料去除水溶液中的六价铬和三价铬:综述。

Cr(VI) and Cr(III) removal from aqueous solution by raw and modified lignocellulosic materials: a review.

机构信息

Centro de Geociencias-Universidad Nacional Autónoma de México, Campus Juriquilla, Boulevard Juriquilla 3001, 76230 Queretaro, Mexico.

出版信息

J Hazard Mater. 2010 Aug 15;180(1-3):1-19. doi: 10.1016/j.jhazmat.2010.04.060. Epub 2010 Apr 21.

Abstract

In aqueous systems, chromium usually exists in both trivalent and hexavalent oxidation states, being Cr(VI) of particular importance and concern due to its great toxicity. Industrial sources of Cr(VI) are leather tanning, mining of chrome ore, production of steel and alloys, etc. The most common conventional method for Cr(VI) removal is reduction to Cr(III) at pH 2.0 and precipitation of Cr (OH)(3) with lime at pH 9-10. The disadvantage of precipitation is the disposal of the solid waste. Adsorption of Cr by different low cost materials seems to be a suitable choice for wastewater treatment. Many by-products of agriculture have proved to be suitable low cost adsorbents for Cr(VI) and Cr(III) removal from water. Lignocellulosic residues, which include both wood residues and agricultural residues, have adsorption capacity comparable to other natural sorbents, but they have the advantage of very low or no cost, great availability and simple operational process. This study is a review of the recent literature on the use of natural and modified lignocellulosic residues for Cr adsorption. The Cr maximum adsorption capacity and the adsorption mechanism under different experimental conditions are reported when possibly.

摘要

在水系统中,铬通常以三价和六价两种氧化态存在,由于其毒性很大,六价铬尤其受到重视和关注。工业来源的六价铬来自皮革鞣制、铬矿石开采、钢铁和合金生产等。去除六价铬的最常见常规方法是在 pH 值为 2.0 时将其还原为三价铬,然后用石灰将铬(OH)(3)沉淀在 pH 值为 9-10 时。沉淀的缺点是固体废物的处理。用不同的低成本材料吸附铬似乎是处理废水的一种合适选择。许多农业副产品已被证明是适合从水中去除六价铬和三价铬的低成本吸附剂。木质纤维素残留物包括木材残渣和农业残渣,它们具有与其他天然吸附剂相当的吸附能力,但它们具有成本低或无成本、可用性高和操作过程简单的优势。本研究综述了最近关于利用天然和改性木质纤维素残留物吸附铬的文献。报告了在不同实验条件下的最大铬吸附容量和吸附机制。

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