Abstract

In this study, the performance of boron carbide (B₄C) on the adsorptive removal of methylene blue from aqueous solutions was investigated. Adsorption studies were carried out using different adsorbent dosage, dye concentration, pH, and temperature parameters. The BET analysis results showed the B₄C surface area is 317.6 m²/g and B₄C has a mesoporous structure. From the adsorption studies, the maximum dye removal percentage was obtained as 97.3% at 55 °C. Besides, different isotherm models were used during adsorption and the order was determined as Langmuir > Flory – Huggins > D – R > Freundlich > Harkins – Jura. For the Langmuir isotherm, q_m was calculated as 188.68 mg/g at 55 °C. D-R isotherm, enthalpy, and activation energy data showed that adsorption took place physically. The kinetic studies showed that the adsorption was compatible with the pseudo-second-order kinetic model. Besides, it was determined from the thermodynamic studies that adsorption occurs endothermically and spontaneously.

摘要

在这项研究中，研究了碳化硼 (B ₄ C) 对水溶液中亚甲基蓝的吸附去除性能。使用不同的吸附剂剂量、染料浓度、pH 和温度参数进行吸附研究。BET分析结果表明B ₄ C比表面积为317.6 m ² /g，B ₄ C具有介孔结构。根据吸附研究，在 55 °C 时获得的最大染料去除百分比为 97.3%。此外，在吸附过程中使用了不同的等温线模型，顺序为Langmuir > Flory – Huggins > D – R > Freundlich > Harkins – Jura。对于朗缪尔等温线，q _m在 55 °C 下计算为 188.68 mg/g。DR 等温线、焓和活化能数据表明吸附是物理发生的。动力学研究表明吸附符合准二级动力学模型。此外，从热力学研究确定吸附是吸热和自发发生的。