Adsorption of humic acid on acid-activated Greek bentonite
Adsorption of humic acid on acid-activated Greek bentonite
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DOI：
10.1016/j.jcis.2009.07.028
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发表时间：
2009-12-15
影响因子：
9.9
通讯作者：
Rigas, F.
中科院分区：
文献类型：
--
作者：
Doulia, Danae;Leodopoulos, Ch.;Rigas, F.
本文研究了用0.25 ~ 13 M稀硫酸溶液酸化处理的希腊米洛斯岛膨润土对腐殖酸的吸附。膨润土活化与3 M硫酸（AAS）显示出更高的效率，从水溶液中去除腐殖酸，并选择作进一步研究。采用亚甲基蓝吸附法测定了酸活化膨润土的比表面积。用扫描电镜（SEM）研究了膨润土的表面形貌。采用批量吸附技术研究了接触时间、吸附质浓度、吸附剂剂量和温度对3 M H2SO 4活化的膨润土吸附腐殖酸的影响。酸性pH和高离子强度被证明是有利的吸附效率。使用伪一级、伪二级和颗粒内扩散模型来描述动力学数据并评估速率常数。用Langmuir、Freundlich和Temkin方程对实验数据进行了分析，并确定了等温常数。还评价了用3 M硫酸活化膨润土吸附腐殖酸的热力学参数（Δ H度、Δ S度和Δ G度）。(C)2009爱思唯尔公司All rights reserved.
The adsorption of humic acid on bentonite from Milos Island (Greece) acid-treated with dilute H2SO4 Solutions over a concentration range between 0.25 and 13 M has been Studied. Bentonite activated with 3 M Sulfuric acid (AAS) showed a higher efficiency in removing humic acid from aqueous solutions and was selected for further investigation. The specific surface area of acid-activated bentonite was estimated using the methylene blue adsorption method. The Morphology of untreated, activated, and HA-sorbed bentonite was studied Under scanning electron microscope (SEM). The effects of contact time, adsorbate concentration, adsorbent dose, and temperature on the adsorption Of humic acid onto bentonite activated with 3 M H2SO4 were Studied using a batch adsorption technique. Acidic pH and high ionic strength proved to be favorable for the adsorption efficiency. Pseudo-first-order, pseudo-second-order, and intraparticle diffusion models were used to describe the kinetic data and the rate constants were evaluated. The experimental isotherm data were analyzed using Langmuir, Freundlich, and Temkin equations and the isotherm constants were determined. Thermodynamic parameters (Delta H degrees, Delta S degrees, and Delta G degrees) of adsorption of humic acid onto acid-activated bentonite with 3 M Sulfuric acid were also evaluated. (C) 2009 Elsevier Inc. All rights reserved.