Faculty of Civil Engineering, University of Belgrade, Belgrade, Serbia.
Water Environ Res. 2011 Jun;83(6):498-506.
Mechanism and performances of arsenic(III) [As(III)] and arsenic(V) [As(V)] sorption onto hydrated iron(III) oxide (HFO)-coated materials were investigated at neutral pH where arsenic occurs in both molecular and ionic forms. Arsenic sorption by HFO-coated materials was proven to be a multistage process consisting of both macropore and intraparticle diffusion. Higher mass-transfer velocities were obtained for As(III), which is attributed to the beneficial features of HFO. Equilibrium studies revealed the spontaneous and favorable nature of the arsenic sorption process. The maximum sorption capacity and the Gibbs free energy values indicated that HFO-coated materials exhibit more affinity towards As(III). The Langmuir and Freundlich isotherm models revealed both the chemical and physical nature of the sorption process, while the Dubinin-Radushkevich model indicated that physical sorption is a more dominant process with HFO-coated materials.
在中性 pH 值条件下，砷（III）[As(III)]和砷（V）[As(V)]在水合三价铁氧化物（HFO）涂层材料上的吸附机理和性能进行了研究。在中性 pH 值条件下，砷（III）和砷（V）同时以分子和离子形式存在。研究表明，HFO 涂层材料对砷的吸附是一个多阶段过程，包括大孔和颗粒内扩散。As(III) 的传质速度更高，这归因于 HFO 的有益特性。平衡研究表明，砷的吸附过程是自发和有利的。最大吸附容量和吉布斯自由能值表明，HFO 涂层材料对 As(III)具有更高的亲和力。Langmuir 和 Freundlich 等温模型揭示了吸附过程的化学和物理性质，而 Dubinin-Radushkevich 模型表明，物理吸附是 HFO 涂层材料更占主导地位的过程。
