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标题：Bioadsorbents and Filters for Removal of Heavy Metals in Different Environmental Samples-A Brief Review
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作者：Hirra Rashid ; Ghazala Yaqub
期刊名称：Nature, Environment and Pollution Technology
印刷版ISSN：0972-6268
出版年度：2017
卷号：16
期号：4
语种：English
出版社：Technoscience Publications
摘要：To eliminate the problem of heavy metals, there are naturally occurring materials that are locally andcommonly found and are very much encouraged as low cost adsorbents such as industrial andagricultural wastes. Several agricultural and industrial wastes as potential adsorbents have beenviewed, which includes wood ash and bone ash, cassava waste, chitosan-g-poly (butyl acrylate)/bentonite nano composite, Eucalyptus tereticornis bark, sarooj clay, orange fruit peel, fly ash, potatopeels, coconut shell charcoal, pecan shells, bagasse fly ash, waste sludge, pith and saw dust, maizecob and husk, hazelnut shell, soybean hull, jackfruit, crab shell, neem leaves, cooked tea dust, teakleaves, cashewnut shells, aerogel carbon, sewage sludge ash and lignite-based fly ash. The adsorptiondetails of these adsorbents have been keenly viewed and judged in batch studies mostly. The judgmentis on the basis of adsorption isotherms, thermodynamics and parameters like contact time, adsorbentdosage, pH, initial metal concentration and adsorption capacity. Hence, it is proved from the review ofthese adsorbents that they are highly selective in terms of separation, thermally and mechanicallystable and do not foul, regenerative and less soluble in liquids. They are commonly available and arevery less costly with removal efficiency up to 99%. The usage of these adsorbents is better applicableat low pH and oxidized or carbonized or activated before using them as adsorbents to remove heavymetal ions from agricultural, industrial and municipal wastes.