A new approach to modification of natural adsorbent for heavy metal adsorption
A new approach to modification of natural adsorbent for heavy metal adsorption
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DOI：
10.1016/j.biortech.2007.04.037
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发表时间：
2008-05-01
影响因子：
11.4
通讯作者：
Dursun, Sukru
中科院分区：
文献类型：
--
作者：
Argun, Mehmet Emin;Dursun, Sukru
用芬顿试剂对天然吸附剂进行改性，并测定了其对水溶液中Cd（II）离子的去除效果。通过红外光谱分析，研究了松树皮改性后吸附材料表面性质的变化。考察了Fe ~（2+）/H_2O_2比值、氧化还原电位（ORP）、pH值和接触时间等因素对反应的影响。不同的吸附等温线也得到使用浓度的镉（II）离子范围从0.1至100毫克L-1。吸附过程遵循准一级反应动力学，并遵循Langmuir吸附等温线。讨论了改性树皮吸附Cd（II）的热力学参数，包括吉布斯自由能、熵和焓的变化，揭示了改性树皮在自然条件下吸附Cd（II）是自发的放热过程。最大去除效率为97%，在pH值为7，90分钟的接触时间（3 - 5毫克L-1的初始浓度和2.5克L-1的固液比）。(C)2007爱思唯尔有限公司保留所有权利。
This paper describes modification of a natural adsorbent with Fenton reagent and determines the removal of Cd(II) ions from aqueous solution. Changes of the surface properties of adsorbent materials were determined by the FT-IR analysis after the modification of pine bark. The effect of Fe2+/H2O2 ratio, ORP, pH, and contact time were determined. Different adsorption isotherms were also obtained using concentrations of Cd(II) ions ranging from 0.1 to 100 mg L-1. The adsorption process follows pseudo-first-order reaction kinetics and follows the Langmuir adsorption isotherm. The paper discusses thermodynamic parameters, including changes in Gibbs free energy, entropy, and enthalpy, for the adsorption of Cd(II) on modified bark, and revealed that the adsorption process was spontaneous and exothermic under natural conditions. The maximum removal efficiency obtained was 97% at pH 7 and with a 90-min contact time (for 3 5 mg L-1 initial concentration and a 2.5 g L-1 solid-to-liquid ratio). (C) 2007 Elsevier Ltd. All rights reserved.