某些氧化铁矿物对砷的吸附:界面化学的影响

B. Koomson, E. Asiam
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引用次数: 4

摘要

从含砷金矿中提取金的湿法冶金急剧增加,不可避免地导致砷释放到世界各地的环境中。尾矿储存设施中残留的砷矿物可被氧化并将砷动员到环境中。这会污染土壤、地下水和地表水,最终污染生物群。尽管在砷修复方面有完善的技术和最近的进展,但对氧化铁底物(针铁矿、赤铁矿和磁铁矿)的矿物学以及这些氧化铁底物在水介质中吸附过程中表面电荷上砷的命运的认识和理解有限。本研究的目的是研究界面化学对砷在选定的氧化铁颗粒上吸附的影响,以帮助更好地理解和了解污染水中的砷去除。采用定量x射线衍射法(QXRD)和酸消解法(电感耦合等离子体发射光谱法(ICP-OES))分别测定了所选氧化铁矿物的总体矿物学和部分化学成分。以氧化铁颗粒为吸附剂进行了Zeta电位测量,以阐明界面化学对溶液中砷的吸附行为的影响。研究证实,氧化铁矿物主要为赤铁矿、磁铁矿和针铁矿,针铁矿中含大量石英。砷的吸附与pH值有关,并对氧化铁颗粒的zeta电位和等电点(IEP)有很大影响。所研究的所有底物的zeta电位在pH为2时呈强正电位,但在pH ~ >.9时呈反转。底物与砷及其水解产物之间的相互作用导致zeta电位的大小显著降低,IEP的变化表明了特异性吸附。关键词:砷,吸附,氧化铁矿物,Zeta电位
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Arsenic Adsorption by Some Iron Oxide Minerals: Influence of Interfacial Chemistry
The dramatic increase in hydrometallurgical extraction of gold from arsenic bearing gold ores has inevitably resulted in the release of arsenic into the environment worldwide. Residual arsenic minerals in tailings storage facilities can be oxidised and mobilise arsenic into the environment. This can contaminate soils, ground and surface waters and eventually biota. In spite of well-established technologies and recent advances in arsenic remediation, there are limited knowledge and understanding of the iron oxide substrate (goethite, hematite and magnetite) mineralogy and the fate of arsenic on the surface charge of these iron oxide substrates in an aqueous media during adsorption. The aim of the present study was to investigate the influence of interfacial chemistry on arsenic adsorption onto selected iron oxide particles to assist in developing a better understanding and new knowledge in arsenic removal from contaminated waters. Bulk mineralogy and partial chemical composition of selected iron oxide minerals were obtained using quantitative x-ray diffractometry (QXRD) and acid digestion followed by metal determination using inductively coupled plasma optical emission spectrometry (ICP-OES) respectively. Zeta Potential measurements involving iron oxide particles as arsenic adsorbents were carried out to elucidate the influence of interfacial chemistry on the adsorption behavior of arsenic from solution. The study confirmed that the iron oxide minerals were predominantly hematite, magnetite and goethite with goethite containing significant amounts of quartz. Arsenic adsorption was pH dependent and strongly influenced the zeta potential and isoelectric point (IEP) of the iron oxide particles. The zeta potential of all substrates studied was strongly positive at pH 2 but indicated a reversal at pH ~ > 9. The interaction between substrates, arsenic and its hydrolysable products resulted in significant decrease in the magnitude of zeta potential and change in IEP indicating specific adsorption.   Keywords: Arsenic, Adsorption, Iron Oxide Minerals, Zeta Potential
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