利用天然沸石和人工沸石增强对纺织废水中亚甲基蓝的吸附。

Enhanced adsorption of methylene blue from textile wastewater by using natural and artificial zeolite.

机构信息

Bitlis Eren University, Department of Environmental Engineering, Bitlis, Turkey E-mail:

Sakarya University, Department of Environmental Engineering, Sakarya, Turkey.

出版信息

Water Sci Technol. 2020 Aug;82(3):513-523. doi: 10.2166/wst.2020.358.

DOI:10.2166/wst.2020.358

PMID:32960796

Abstract

This study investigated the adsorption of methylene blue with natural and artificial zeolite. The effect of pH, contact time, initial concentration and adsorbent dose on adsorption was also investigated. An artificial dye was prepared. Adsorption removal efficiency was low at pH = 2, 3 and 4 but it was quite high at pH = 7. It was determined that the contact time reaches equilibrium within 60 minutes in the adsorption of methylene blue with natural and artificial zeolite. The initial dyestuff concentration for both adsorbents was 5 mg/L. For the removal of methylene blue, a 0.5 g natural and artificial zeolite dosage was sufficient. In order to express the adsorption of natural and artificial zeolite on methylene blue, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) isotherm models were examined. In the isotherm study, both natural and artificial zeolite adapted to the Langmuir isotherm model. Langmuir correlation coefficient was 0.998 for artificial zeolite and 0.993 for natural zeolite. Both adsorbent materials best fit into the pseudo-second kinetic model with similar correlation coefficient values of 0.999.

摘要

本研究考察了天然沸石和人工沸石对亚甲基蓝的吸附作用。还考察了 pH 值、接触时间、初始浓度和吸附剂用量对吸附的影响。人工合成了一种染料。在 pH 值为 2、3 和 4 时，吸附去除效率较低，但在 pH 值为 7 时，吸附去除效率相当高。结果表明，天然沸石和人工沸石对亚甲基蓝的吸附在 60 分钟内达到平衡。两种吸附剂的初始染料浓度均为 5mg/L。对于亚甲基蓝的去除，0.5g 天然沸石和人工沸石的用量就足够了。为了表达天然沸石和人工沸石对亚甲基蓝的吸附，考察了 Langmuir、Freundlich、Temkin 和 Dubinin-Radushkevich（D-R）等温吸附模型。在等温吸附研究中，天然沸石和人工沸石都适合 Langmuir 等温吸附模型。人工沸石的 Langmuir 相关系数为 0.998，天然沸石的 Langmuir 相关系数为 0.993。两种吸附剂材料均与拟二级动力学模型拟合较好，相关系数值均为 0.999。