Kinetics and thermodynamics study on thiamethoxam adsorption onto TiO2 and perlite supported TiO2

IF 1.7 4区化学 Q4 CHEMISTRY, PHYSICAL

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2025-03-15 DOI:10.1007/s11144-025-02827-x

Emmanuel Ngaha, Dilek Duranoğlu

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Abstract

Adsorption of thiamethoxam onto TiO₂ and perlite supported TiO₂ composite (PST) was investigated at different contact time and temperature (295 and 318 K). Adsorption kinetic was evaluated by using the Lindstrom adsorption model to obtain the rate constants of adsorption (k₁) and desorption (k₂) simultaneously. Thermodynamic parameters of adsorption like activation energy (∆E_a), Gibbs free energy (∆G_a), enthalpy (∆H_a), and entropy (∆S_a) were also calculated. The adsorption progressively increased with the contact time until equilibrium was achieved, except with PST (295 K), where almost 81% of the THX was eliminated during the initial 10 min. Equilibrium was reached after 35 min for TiO₂ and PST at any temperatures. The endothermic nature of the adsorption reaction of THX onto TiO₂ and PST has been highlighted. The modeling of the adsorption process allowed us to obtain the theoretical expression of THX adsorbed fraction (φ(t)) and then the adsorption (k₁₎ and desorption (k₁) rate constant. Adsorption was faster than desorption and spontaneously occurred, unlike desorption, which was non-spontaneous.

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噻虫胺吸附TiO2及珍珠岩负载TiO2的动力学和热力学研究

研究了不同接触时间和温度（295和318 K）下噻虫嗪在TiO2和perite负载TiO2复合材料（PST）上的吸附。采用Lindstrom吸附模型对吸附动力学进行评价，得到吸附速率常数k1和解吸速率常数k2。计算了吸附的热力学参数，如活化能（∆Ea）、吉布斯自由能（∆Ga）、焓（∆Ha）和熵（∆Sa）。随着接触时间的增加，吸附量逐渐增加，直到达到平衡，除了PST (295 K)，在最初的10分钟内，几乎81%的THX被消除。在任何温度下，TiO2和PST均在35 min后达到平衡。THX在TiO2和PST上吸附反应的吸热性质得到了强调。通过对吸附过程的建模，我们得到了THX吸附分数（φ(t)）的理论表达式，进而得到了吸附（k1）和解吸（k1）速率常数。吸附比解吸快，并且是自发发生的，而解吸是非自发的。

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来源期刊

Reaction Kinetics, Mechanisms and Catalysis CHEMISTRY, PHYSICAL-

CiteScore

3.30

自引率

5.60%

发文量

201

审稿时长

2.8 months

期刊介绍： Reaction Kinetics, Mechanisms and Catalysis is a medium for original contributions in the following fields: -kinetics of homogeneous reactions in gas, liquid and solid phase; -Homogeneous catalysis; -Heterogeneous catalysis; -Adsorption in heterogeneous catalysis; -Transport processes related to reaction kinetics and catalysis; -Preparation and study of catalysts; -Reactors and apparatus. Reaction Kinetics, Mechanisms and Catalysis was formerly published under the title Reaction Kinetics and Catalysis Letters.