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首页> 外文期刊>Journal of Colloid and Interface Science >THE ZETA POTENTIAL OF IRON AND CHROMIUM HYDROUS OXIDES DURING ADSORPTION AND COPRECIPITATION OF AQUEOUS HEAVY METALS
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THE ZETA POTENTIAL OF IRON AND CHROMIUM HYDROUS OXIDES DURING ADSORPTION AND COPRECIPITATION OF AQUEOUS HEAVY METALS

机译：铁和铬水合氧化物在重金属吸附和沉淀过程中的Zeta势

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摘要

The adsorption and coprecipitation characteristics of Cr(III), Zn(II), and Ni(II) with amorphous hydrous iron(III) oxide (HFO) and those of Zn(II) and Ni(II) with amorphous hydrous chromium(III) oxide (HCO) have been measured by the authors (R. J. Crawford, I. H. Harding, and D. E. Mainwaring, Langmuir 9, 3050, 1993). In the current study, the zeta potentials of these colloidal substrates have been measured as a function of pH during and under the same conditions as the adsorption and coprecipitation processes. The Gouy-Chapman-Stern-Grahame model of the electrical double layer has been used, with allowance for specific site interactions, to accurately model the pH-dependent zeta potential for the individual hydrous metal oxides involved. A surface site mixing model has been proposed which models the zeta potential of the oxide substrates in the presence of an increasing amount of a dissimilar second oxide surface, which results from the process of metal ion adsorption or coprecipitation. This mixing model was found to satisfactorily account for all trends observed in the zeta potentials measured during the adsorption and coprecipitation of Cr(III), Zn(II), and Ni(II) with HFO and those of Zn(II) and Ni(II) with HCO. (C) 1996 Academic Press, Inc. [References: 34]
机译：Cr（III），Zn（II）和Ni（II）在无定形含水氧化铁（HFO）上的吸附和共沉淀特性以及Zn（II）和Ni（II）在无定形含水铬（III）上的吸附和共沉淀特性）（HCO）由作者（RJ Crawford，IH Harding，and DE Mainwaring，Langmuir 9，3050，1993）测量。在当前的研究中，在与吸附和共沉淀过程相同的条件下以及在相同条件下，这些胶体基质的zeta电位已作为pH的函数进行了测量。考虑到特定的位点相互作用，已使用双电层的Gouy-Chapman-Stern-Grahame模型，以精确建模涉及的各个含水金属氧化物的pH依赖的Zeta电位。已经提出了一种表面位点混合模型，该模型在存在越来越多的不同的第二氧化物表面的情况下对氧化物基底的ζ电位进行建模，这是由金属离子吸附或共沉淀过程产生的。发现该混合模型可以令人满意地说明在Cr（III），Zn（II）和Ni（II）与HFO以及Zn（II）和Ni（ II）与HCO。 （C）1996 Academic Press，Inc. [参考：34]

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