Crystal violet adsorption onto modified biosorbent prepared from agricultural waste: kinetics, isotherm and thermodynamic studies

IF 1.9 4区工程技术 Q3 ENGINEERING, CHEMICAL

Chemical Engineering Communications Pub Date : 2023-10-10 DOI:10.1080/00986445.2023.2266677

Betul Tuba Gemici

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引用次数: 0

Abstract

AbstractThe present study investigated crystal violet removal by modifying the chestnut shell with a chemical activation method. For this purpose, H2SO4 and NaOH pretreatments were applied to the chestnut shell and the pretreatment method that gave the best performance under the same conditions was determined. The best adsorption efficiency was achieved with the NaOH pretreatment (99.06%) and the crystal violet adsorption reached equilibrium within 60 min. After selecting the best chemical activation method, the modified chestnut shell was characterized before and after adsorption (FTIR and SEM). Furthermore, the effects of parameters such as pH, initial crystal violet concentration, adsorbent dosage, temperature, and contact time were observed. Moreover, isotherm, kinetics and thermodynamics of the adsorption process were researched in detail. The best results were obtained with the Langmuir isotherm model (R2=0.99) and the pseudo-second-order kinetic model (R2=0.99). Thermodynamic parameters showed that the adsorption process is spontaneous, endothermic and feasible.Keywords: Adsorptioncrystal violetisothermkineticsmodified chestnut shellthermodynamic Authors’ contributionsB.T.G. conducted all the experiments and data analyses and prepared original draft.Disclosure statementThe author declares that there is no conflict of interest.

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由农业废弃物制备的改性生物吸附剂对结晶紫的吸附:动力学、等温线和热力学研究

摘要本文研究了化学活化法修饰板栗壳去除结晶紫的方法。为此，对板栗壳进行了H2SO4和NaOH预处理，确定了在相同条件下性能最佳的预处理方法。NaOH预处理达到最佳吸附效率(99.06%)，结晶紫吸附在60 min内达到平衡。选择最佳化学活化方法后，对改性板栗壳吸附前后进行了表征(FTIR和SEM)。考察了pH、结晶紫初始浓度、吸附剂用量、温度、接触时间等参数对吸附效果的影响。并对吸附过程的等温线、动力学和热力学进行了详细研究。Langmuir等温线模型(R2=0.99)和拟二级动力学模型(R2=0.99)得到的结果最好。热力学参数表明，吸附过程是自发的、吸热的、可行的。关键词:吸附;结晶;紫;负责所有实验和数据分析，并撰写初稿。披露声明作者声明不存在利益冲突。

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来源期刊

Chemical Engineering Communications 工程技术-工程：化工

CiteScore

5.50

自引率

4.00%

发文量

审稿时长

6 months

期刊介绍： Chemical Engineering Communications provides a forum for the publication of manuscripts reporting on results of both basic and applied research in all areas of chemical engineering. The journal''s audience includes researchers and practitioners in academia, industry, and government. Chemical Engineering Communications publishes full-length research articles dealing with completed research projects on subjects such as experimentation (both techniques and data) and new theoretical models. Critical review papers reporting on the current state of the art in topical areas of chemical engineering are also welcome; submission of these is strongly encouraged.