Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Viet Nam; Faculty of Natural Sciences, Duy Tan University, Da Nang City, 550000, Viet Nam.
Industrial University of Ho Chi Minh City, 12 Nguyen Van Bao, Go Vap District, Ho Chi Minh City, 700000, Viet Nam.
Chemosphere. 2020 Oct;257:127147. doi: 10.1016/j.chemosphere.2020.127147. Epub 2020 May 21.
In this report, the adsorption of Cr(VI) onto MnO/CS nanocomposite material from aqueous solution is investigated. All the factors, which affect the adsorption, such as pH, adsorption time, Cr(VI) initial concentration and adsorbent dosage, are also examined. The results obtained show that the Cr(VI) uptake is strongly affected by pH and ion strength. Analysis within the nonlinear isotherm models indicates that the Sips isotherm combining with the Langmuir and Freundlich models offer the best fit to the experimental data due to the obtained highest R and smallest RMSE and χ values. The calculated Langmuir monolayer adsorption capacity is 61.56 mg g at pH of 2.0 and adsorption time of 120 min. Moreover, the mechanism studies by combining theoretical models with analytical spectroscopies reveal that the electrostatic attraction plays the important role to the uptake of Cr(VI) onto MnO/CS nanocomposite. Therefore, the present nanocomposite material can be applied to remove total Cr from wastewater produced by the galvanized manufacturing factory with a relatively high efficiency.
在本报告中，研究了 MnO/CS 纳米复合材料从水溶液中吸附 Cr(VI)的情况。还考察了影响吸附的所有因素，如 pH 值、吸附时间、Cr(VI)初始浓度和吸附剂用量。结果表明，Cr(VI)的摄取强烈受到 pH 值和离子强度的影响。非线性等温线模型的分析表明，Sips 等温线与 Langmuir 和 Freundlich 模型相结合，由于获得的最高 R 和最小 RMSE 和 χ 值，最能拟合实验数据。在 pH 值为 2.0 和吸附时间为 120 min 的条件下，计算出的单层 Langmuir 吸附容量为 61.56mg/g。此外，通过将理论模型与分析光谱学相结合的机理研究表明，静电吸引对 MnO/CS 纳米复合材料吸附 Cr(VI)起着重要作用。因此，该纳米复合材料可用于去除镀锌制造厂产生的废水中的总铬，效率相对较高。
