Adsorption of methylene blue from aqueous solution by biochar prepared from jackfruit peel: isotherm model studies

Loc Ton-That, Hoang-Dung Pham, T. Huynh, B. Duong, T. Luu, Duy-Khoi Nguyen, Ngoc-An Nguyen, T. Ho, Van-Hien Pham, Van‐Phuc Dinh
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Abstract

In this study, biochar derived from Jackfruit peel (JA) via the pyrolysis at 500 °C for 2 h was used as an adsorbent to remove Methylene Blue (MB) from aqueous solution. Effects of pH, contact time, and initial MB concentration were investigated. Isotherm models, such as Langmuir, Freundlich, Sips, and Dubinin-Radushkevich, were applied to estimate the adsorption in nature. The results indicated that the Sips and Freundlich models gave the best fit with experimental datas. The maximum adsorption capacity of MB calculated from Langmuir was 39.87 mg/g at 306K, pH = 11, and time = 60 min. The E value evaluated from Dubinin-Radushkevich smaller than 8 kJ/mol indicated that the MB adsorption of JA followed a physical process.
菠萝蜜皮制备的生物炭吸附水溶液中的亚甲基蓝:等温模型研究
本研究以菠萝蜜果皮(JA)为原料,在500℃热解2 h,制备生物炭作为吸附剂去除水溶液中的亚甲基蓝(MB)。考察了pH、接触时间和初始MB浓度的影响。等温模型,如Langmuir, Freundlich, Sips和Dubinin-Radushkevich,被用于估计自然界中的吸附。结果表明,Sips和Freundlich模型与实验数据拟合最好。Langmuir法在306K、pH = 11、时间= 60 min条件下对MB的最大吸附量为39.87 mg/g, Dubinin-Radushkevich法测定的E值小于8 kJ/mol,表明MB对JA的吸附是一个物理过程。
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