伞形蛇舌草活性炭吸附活性毒性染料的实验研究

IF 2.8 4区 工程技术 Q2 CHEMISTRY, APPLIED
J. Sheeja, K. Sampath, R. Kesavasamy
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引用次数: 7

摘要

采用化学活化和热活化法制备了球形蛇舌草活性炭(HUAC)。研究了蛇舌草活性炭对碱性绿4 (BG4)和酸性品红(AF)的吸附行为,并用紫外可见光谱(UV-vis)、红外光谱(FTIR)和FESEM对其进行了表征。探讨了BG4和AF染料在HUAC表面吸附的可能机理。考察了初始染料浓度、pH、吸附剂用量、接触时间、温度等不同吸附控制参数对吸附效果的影响。pH值为10时BG4去除率为97.94%,pH值为4时AF去除率为76.7%。采用Langmuir、Freundlich和Temkin等温线拟合实验数据,考察吸附机理。吸附数据显示,BG4的单层吸附容量最大为102.38 mg/g, AF的多层吸附容量最大为139.33 mg/g。不同初始染料浓度下的动力学数据分别用伪一级、伪二级和颗粒内扩散模型计算。计算吉布斯自由能变化∆g0、焓变化∆H 0、熵变化∆S 0等热力学参数。由所得值可知,∆G 0和∆H 0为负值,说明HUAC对BG4和AF的吸附是自发的、放热的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental Investigations on Adsorption of Reactive Toxic Dyes Using Hedyotis umbellate Activated Carbon
Hedyotis umbellate activated carbon (HUAC) was prepared by chemical and thermal activation. The adsorption behavior of Hedyotis umbellate activated carbon in aqueous basic green 4 (BG4) and acid fuchsin (AF) was investigated and characterized by UV-vis, FTIR, and FESEM. The possible mechanism of the adsorption of BG4 and AF dyes on the HUAC surface was framed. The influence of various adsorption control parameters like the initial dye concentration, pH, adsorbent dose, contact time, and temperature was studied. The data confirmed excellent BG4 removal of 97.94% at pH 10 and AF removal of 76.7% at pH 4. The experimental data were fitted using Langmuir, Freundlich, and Temkin isotherms to examine the adsorption mechanism. The adsorption data revealed monolayer adsorption of BG4 with the maximum capacity of 102.38 mg/g and multilayer adsorption of AF with the capacity of 139.33 mg/g. The kinetic data for different initial dye concentrations were computed using pseudofirst order, pseudosecond order, and intraparticle diffusion models. Thermodynamic parameters like Gibbs free energy change ∆ G 0 , enthalpy change ∆ H 0 , and entropy change ∆ S 0 were evaluated. From the values obtained, the negative values of ∆ G 0 and ∆ H 0 indicate that the adsorption of BG4 and AF by HUAC is spontaneous and exothermic.
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来源期刊
Adsorption Science & Technology
Adsorption Science & Technology 工程技术-工程:化工
CiteScore
5.00
自引率
10.30%
发文量
181
审稿时长
4.5 months
期刊介绍: Adsorption Science & Technology is a peer-reviewed, open access journal devoted to studies of adsorption and desorption phenomena, which publishes original research papers and critical review articles, with occasional special issues relating to particular topics and symposia.
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