Chemically modified maize cobs waste with enhanced adsorption properties upon methyl orange and arsenic.
Chemically modified maize cobs waste with enhanced adsorption properties upon methyl orange and arsenic.
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DOI：
10.1016/j.biortech.2007.09.023
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发表时间：
2008-07
影响因子：
11.4
通讯作者：
M. P. Elizalde-González;J. Mattusch;R. Wennrich
中科院分区：
文献类型：
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作者：
M. P. Elizalde-González;J. Mattusch;R. Wennrich
The surface chemistry of maize naturasorbent was altered in this work by the modifying agents: phosphoric acid and different amines (triethanolamine, diethylenetriamine and 1,4-diaminobutane). Removal of methyl orange (25mgl−1) was <50% by maize corn cobs modified by phosphorylation and higher by the quaternized samples: 68% with the 1,4-diaminobutane and 73% with the diethylenetriamine modificators. Adsorption of arsenite by the samples modified with phosphoric acid/ammonia was 11μgg−1, which corresponds to 98% removal from a 550μg As l−1solution for an adsorbent dose of 50mgml−1. The samples modified by phosphoric acid/urea removed 0.4μgg−1arsenate from a 300μg As l−1solution. Adsorption of methyl orange, arsenite and arsenate was superior by the chemically modified maize cobs judged against the initial naturasorbent. For comparison, removal by the commercial anion exchanger was 100% for methyl orange, 45% (5μgg−1) for arsenite and 99% (5μgg−1) for arsenate.
