Comparative uptake study of toxic elements from aqueous media by the different particle-size-fractions of fly ash
Comparative uptake study of toxic elements from aqueous media by the different particle-size-fractions of fly ash
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DOI：
10.1016/j.jhazmat.2010.07.095
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发表时间：
2010-11-15
影响因子：
13.6
通讯作者：
Moutsatsou, Angeliki
中科院分区：
文献类型：
--
作者：
Itskos, Grigorios;Koukouzas, Nikolaos;Moutsatsou, Angeliki
本文所述的研究的目的是确定去除铬（总），铬（VI），铜，镍，铅，锌和镉从废水中使用不同的粒度级的高钙质和高硅质粉煤灰（FA）。测试了三种不同的希腊FA（两种钙质和一种硅质）从水溶液中沉淀重金属的能力。每个FA样品被分成六个不同的粒度级，粒度范围为：[（0-25）（25-40）（40-90）（90-150）（150-400）和（>400）] μ m。根据其化学组成、pH、烧失量（LOI）和CaOf（%）来评估不同的FA颗粒级分。批吸附实验，然后进行，表明各种颗粒馏分的高硅FA沉淀Cr（VI）更有效，但不太能够保留镉，铜，镍，铅和锌。另一方面，高钙粉煤灰被证明是更有效地吸收镉，铜，镍，铅和锌，但较少的六价铬。这种特殊的趋势也证实了在相同的粉煤灰的不同粒径分数的情况下。事实证明，当将脂肪酸分离成它们的大小级分时，它可以在工业废水修复领域中更有效。(C)2010 Elsevier BV保留所有权利。
The purpose of the study described in this paper was to determine the removal of Cr (total), Cr (VI), Cu, Ni, Pb, Zn and Cd from wastewater using different particle-size-fractions of highly calcareous and highly siliceous fly ashes (FAs). Three different Hellenic FAs (two calcareous and one siliceous) were tested for their capability of precipitating heavy metals from aqueous solutions. Each FA sample was separated into six different size-fractions with a grain diameter range of:[(0-25)(25-40) (40-90) (90-150) (150-400) and (>400)] mu m. The different FA grain-fractions were evaluated in terms of their chemical composition, pH. Loss on Ignition (LOI) and CaOf (%). Batch adsorption experiments were then carried out, indicating that the various grain-fractions of the highly siliceous FA were more efficient in precipitating Cr (VI) but less capable of retaining Cd, Cu, Ni, Pb and Zn. On the other hand, the high-Ca fly ashes were proven to be more efficient in uptaking Cd, Cu, Ni, Pb and Zn, but less in hexavalent chromium. This particular tendency was also confirmed in the case of the different particle-size-fractions of same fly ashes. It was actually verified that FAs can be more effective in the field of industrial wastewater-remediation when separated into their size-fractions. (C) 2010 Elsevier B.V. All rights reserved.