Coşkun Yasemin İşlek, Aksuner Nur, Yanik Jale
Acta Chim Slov. 2019 Jun;66(2):402-413.
Sandpaper wastes were used as adsorbent after pyrolysis at 500 °C and calcination at 800 °C for the removal of brilliant green and malachite green cationic dye from an aqueous solution. The effects of the pH, the adsorbent dose, the contact time, and the initial dye concentration on the removal efficiencies were investigated. The isotherm studies were conducted by using the Langmuir, Freundlich, and Dubinin-Radushkevich models, and thermodynamic studies were also performed. The adsorption of the Brilliant green and malachite green were found to comply with the Langmuir isotherm model and the Freundlich isotherm model, respectively. The thermodynamic studies showed that the adsorption of dyes were endothermic. The E values obtained from the Dubinin-Radushkevich isotherm showed that the adsorption mechanism was chemical in nature. Furthermore, the three kinetic models (pseudo first-order, pseudo second-order, and intraparticle diffusion) were investigated. It was found that the pseudo second-order kinetic model fitted well for adsorption of dyes.
砂纸废料在500℃热解并在800℃煅烧后用作吸附剂，用于从水溶液中去除亮绿和孔雀石绿阳离子染料。研究了pH值、吸附剂用量、接触时间和初始染料浓度对去除效率的影响。通过使用朗缪尔、弗伦德利希和杜比宁-拉杜舍维奇模型进行等温线研究，并进行了热力学研究。发现亮绿和孔雀石绿的吸附分别符合朗缪尔等温线模型和弗伦德利希等温线模型。热力学研究表明染料的吸附是吸热的。从杜比宁-拉杜舍维奇等温线获得的E值表明吸附机制本质上是化学的。此外，研究了三种动力学模型（准一级、准二级和颗粒内扩散）。发现准二级动力学模型非常适合染料的吸附。
