High surface area materials prepared from sewage sludge-based precursors
High surface area materials prepared from sewage sludge-based precursors
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DOI：
10.1016/j.chemosphere.2006.02.017
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发表时间：
2006-09-01
期刊：
影响因子：
8.8
通讯作者：
Linares-Solano, A.
中科院分区：
文献类型：
--
作者：
Ros, A.;Lillo-Rodenas, M. A.;Linares-Solano, A.
本文重点研究基于污水污泥的前体的物理活化（COD 和化学活化（H3PO4、NaOH 和 KOH）。我们的结果表明，（i）简单的酸洗处理导致某些前体的吸附能力显着增加；（ii）在测试的实验条件下，CO2 物理活化和 H3PO4 化学活化对于有效的孔隙度发展是无效的；（iii）选择合适的方案， 通过用碱性氢氧化物对污泥基前体进行化学活化，可以获得高度多孔材料（700-1700 m(2) g(-1)）。用NaOH或KOH进行化学活化的效率很大程度上受用于混合活化剂和前体的方法的影响。当将研磨的氢氧化物与前体物理混合时获得的材料的 BET 值几乎是其他混合时获得的值的两倍 方法被采用。增加氢氧化物：前体比会导致吸附剂的吸附能力增强，对于NaOH活化，BET值范围为689至1224 m(2) g(-1)，对于KOH活化，BET值范围为853至1686 m(2) g(-1)。 (c) 2006 Elsevier Ltd. 保留所有权利。
This paper focuses on physical activation (COD and chemical activation (H3PO4, NaOH and KOH) of sewage sludge-based precursors. Our results show that (i) a simple acid washing treatment leads to a significant increase in the adsorption capacity of some precursors; (ii) under the experimental conditions tested, CO2 physical activation and chemical activation with H3PO4 were ineffective for an efficient porosity development and (iii) choosing an appropriate protocol, it is possible to obtain highly porous materials (700-1700 m(2) g(-1)) by chemical activation of sludge-based precursors with alkaline hydroxides. The efficiency of the chemical activation with NaOH or KOH is very much influenced by the method used for mixing the activating agent and the precursor. The BET values of the materials obtained when physically mixing ground hydroxides with the precursor almost doubled the values obtained if other mixing methods are employed. Increasing the hydroxide: precursor ratio leads to an enhancement of the adsorption capacity of the adsorbents, with BET values ranging from 689 to 1224 m(2) g(-1) for NaOH activation and from 853 to 1686 m(2) g(-1) for KOH activation. (c) 2006 Elsevier Ltd. All rights reserved.