Saha Bedabrata, Chakraborty Saswati, Das Gopal
Centre for the Environment, Indian Institute of Technology Guwahati, Assam-781039, India.
J Colloid Interface Sci. 2008 Jul 1;323(1):26-32. doi: 10.1016/j.jcis.2008.04.010. Epub 2008 Apr 10.
Benzene-1,3,5-tri-carboxylic acid (trimesic acid, TMA) coated on basic alumina has been shown to be an effective adsorbent for Fe(III) and Fe(II) from aqueous solution. A comparative study on the adsorption of Fe(III) and Fe(II) revealed that TMA coated alumina is more selective towards Fe(III) than Fe(II). The maximum adsorptions of Fe(III) and Fe(II) were 26.6 mg/g and 8.4 mg/g, respectively. Fe(III)/Fe(II) adsorption was also compared in some cases with adsorption of Co(II) and Ni(II). Maximum uptakes (Qm) for Co(II) and Ni(II) were found much lower (approximately 1 mg/g) than Fe(III)/Fe(II). pH dependent studies have revealed that Fe(III) was adsorbed efficiently at high acidic condition (pH approximately 1.5) compared to Fe(II), Co(II) and Ni(II), while temperature did not have significant effect on the adsorption processes. Adsorption of Fe(III) and Fe(II) was quite rapid and thermodynamically favourable. Adsorption processes fitted well in Langmuir isotherm model and followed second order rate kinetics in all cases.
已证明涂覆在碱性氧化铝上的苯 - 1,3,5 - 三羧酸（均苯三甲酸，TMA）是从水溶液中吸附Fe(III)和Fe(II)的有效吸附剂。对Fe(III)和Fe(II)吸附的比较研究表明，涂覆TMA的氧化铝对Fe(III)的选择性高于Fe(II)。Fe(III)和Fe(II)的最大吸附量分别为26.6 mg/g和8.4 mg/g。在某些情况下，还将Fe(III)/Fe(II)的吸附与Co(II)和Ni(II)的吸附进行了比较。发现Co(II)和Ni(II)的最大吸附量（Qm）比Fe(III)/Fe(II)低得多（约1 mg/g）。pH依赖性研究表明，与Fe(II)、Co(II)和Ni(II)相比，Fe(III)在高酸性条件下（pH约为1.5）能有效吸附，而温度对吸附过程没有显著影响。Fe(III)和Fe(II)的吸附相当迅速且在热力学上是有利的。吸附过程在所有情况下都很好地符合朗缪尔等温线模型并遵循二级速率动力学。
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