Kinetics and Mechanism of Methylene Blue Adsorption by a TiO2/Diatomite Nanocomposite and Its Components

IF 0.9 Q3 Engineering Surface Engineering and Applied Electrochemistry Pub Date : 2023-12-14 DOI:10.3103/S1068375523060078

T. Ya. Datsko, V. I. Zelentsov

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Abstract

A study was made of the kinetics of the adsorption of the methylene blue dye from an aqueous solution on the photocatalyst DDT (nanosized titanium dioxide in the anatase phase, deposited on diatomite) and its components: diatomite D and anatase TiO₂. The effect of the initial concentration and pH of the methylene blue solution on the rate of the adsorption process was investigated. The kinetic data of adsorption were processed using two simplified kinetic models, one of the pseudo-first-order and the other of pseudo-second-order. To investigate the adsorption mechanism, a model of intraparticle diffusion kinetics was employed. The adsorption kinetics of methylene blue on the surfaces of D, TiO₂, and DDT was found to be best described by the pseudo-second-order model. It was shown that the adsorption of methylene blue on the D and DDT adsorbents is a multistep process involving adsorption on the external surface and inside particles, with the limiting step being a chemical reaction. For the adsorption on TiO₂, the limiting step is the external diffusion.

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TiO2/Diatomite 纳米复合材料及其成分吸附亚甲基蓝的动力学和机理

摘要研究了光催化剂DDT(硅藻土上沉积的锐钛矿相纳米二氧化钛)及其组分硅藻土D和锐钛矿TiO2对水溶液中亚甲基蓝染料的吸附动力学。考察了亚甲基蓝溶液的初始浓度和pH对吸附速率的影响。采用拟一级和拟二级两种简化的吸附动力学模型对吸附动力学数据进行了处理。为了研究吸附机理，采用了颗粒内扩散动力学模型。亚甲基蓝在D、TiO2和DDT表面的吸附动力学可以用拟二阶模型来描述。结果表明，亚甲基蓝在D和DDT吸附剂上的吸附是一个多步骤的过程，包括外表面和颗粒内部的吸附，其限制步骤是化学反应。对于TiO2的吸附，限制步骤是外扩散。

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来源期刊

Surface Engineering and Applied Electrochemistry Engineering-Industrial and Manufacturing Engineering

CiteScore

1.60

自引率

22.20%

发文量

期刊介绍： Surface Engineering and Applied Electrochemistry is a journal that publishes original and review articles on theory and applications of electroerosion and electrochemical methods for the treatment of materials; physical and chemical methods for the preparation of macro-, micro-, and nanomaterials and their properties; electrical processes in engineering, chemistry, and methods for the processing of biological products and food; and application electromagnetic fields in biological systems.