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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Adsorption-desorption of heavy metal ions.
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Adsorption-desorption of heavy metal ions.

机译：重金属离子的吸附-解吸。

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摘要

Adsorption and desorption studies on different types of adsorbents, including natural materials such as teak tree bark powder, rice husk, natural bentonite, different algae like Ecklonia maxima, Escherichia coli, Ascophyllum nodasum, Rhizopus nigricans, Cladophora fascicularis, goethite and soils of three nuclear power plant and artificial materials such as Fe oxide-coated sand, goethite pretreated with phosphate, dithizone modified sodium trititanate whisker, modified nanometre sized TiO 2, Chromosorb 102 resins and poly(m-phenylenediamine) are summarized. The kinetics, thermodynamics, sorption/desorption mechanism of different metal ions on different adsorbents under different experimental conditions are discussed. It is found that desorbing agent is greatly dependent on the adsorbate used. All the metal ions are desorbed using acids like HCl, HNO 3 and H 2SO 4 in most of the cases, except Cr(VI). EDTA can be used to remove Pb 2+ and Zn 2+ in addition to acids. Since Cr(VI) is present in anionic form; it can be eliminated from the loaded adsorbents using bases like NaOH, Na 2CO 3 or NaHCO 3.
机译：对不同类型吸附剂的吸附和解吸研究，包括天然材料，如柚木树皮粉，稻壳，天然膨润土，不同藻类（如Ecklonia maxima，大肠杆菌，Ascophyllum nodasum，Rhizopus nigricans，Cladophora fascicularis，针铁矿和三核土壤）总结了电厂和人造材料，例如氧化铁涂层的砂，经过磷酸盐预处理的针铁矿，双硫zone改性的三钛酸钠晶须，改性的纳米级TiO 2，Chromosorb 102树脂和聚间苯二胺。讨论了不同实验条件下不同金属离子在不同吸附剂上的动力学，热力学，吸附/解吸机理。发现解吸剂在很大程度上取决于所使用的被吸附物。除Cr（VI）外，大多数情况下，所有金属离子均使用HCl，HNO 3和H 2SO 4等酸解吸。 EDTA除可去除酸外还可用于去除Pb 2+和Zn 2+。由于Cr（VI）以阴离子形式存在;可以使用NaOH，Na 2CO 3或NaHCO 3等碱将其从负载的吸附剂中消除。

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