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Response surface methodology directed adsorption of chlorate and chlorite onto MIEX resin and study of chemical properties
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-01-03 , DOI: 10.1039/c9ew01003c Yiqiong Yang 1, 2, 3, 4 , Zenghui Zheng 1, 2, 3, 4 , Dongfeng Zhang 1, 2, 3, 4 , Xiaodong Zhang 1, 2, 3, 4
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-01-03 , DOI: 10.1039/c9ew01003c Yiqiong Yang 1, 2, 3, 4 , Zenghui Zheng 1, 2, 3, 4 , Dongfeng Zhang 1, 2, 3, 4 , Xiaodong Zhang 1, 2, 3, 4
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This study investigates the adsorption behaviors of chlorate and chlorite by MIEX resin, and determines the optimal conditions for the removal rate by utilizing response surface methodology. The chemical properties of the solution, such as pH, coexistent anions and ion strength, have great influences on the adsorption of chlorate and chlorite. The adsorption capacities of chlorate and chlorite by MIEX are 525 and 398 mg L−1, respectively. When the pH is close to neutral, the removal rate of chlorate and chlorite on MIEX is the best. Sulfate radicals have a damaging influence on the adsorption of chlorate and chlorite on MIEX, leading to a low adsorption capacity. The initial adsorption kinetics of chlorate and chlorite adsorption on MIEX follows the intra-particle diffusion-controlled adsorption. The Box–Behnken design method is successfully used to establish a quadratic polynomial mode for predicting the removal efficiency of chlorate and chlorite, which is composed of three variables (adsorbent dosage, reaction time and initial concentration). The optimal removal conditions are: dosage 6.67 mL L−1, reaction time 45.26 min, initial concentration 3.08 mg L−1 for chlorate; and dosage 9.62 mL L−1, reaction time 46.36 min, initial concentration 3.04 mg L−1 for chlorite. According to the results, the adsorbent dosage has a strong interaction with the chlorate or chlorite concentration and reaction time, which has a significant impact on the optimization of the chlorate and chlorite removal process using MIEX. According to FTIR spectra, the adsorption mechanism for chlorate and chlorite is anion exchange.
中文翻译：
响应面法指导氯酸盐和亚氯酸盐在MIEX树脂上的吸附以及化学性质的研究
本研究研究了MIEX树脂对氯酸盐和亚氯酸盐的吸附行为，并通过响应面法确定了去除率的最佳条件。溶液的化学性质（例如pH值，共存阴离子和离子强度）对氯酸盐和亚氯酸盐的吸附有很大影响。MIEX对氯酸盐和亚氯酸盐的吸附能力分别为525和398 mg L -1， 分别。当pH值接近中性时，MIEX上氯酸盐和亚氯酸盐的去除率最好。硫酸根自由基对MIEX上氯酸盐和亚氯酸盐的吸附具有破坏性影响，导致吸附能力低。氯酸盐和亚氯酸盐在MIEX上的初始吸附动力学遵循颗粒内扩散控制的吸附。Box-Behnken设计方法已成功用于建立二次多项式模式，以预测氯酸盐和亚氯酸盐的去除效率，该模式由三个变量（吸附剂剂量，反应时间和初始浓度）组成。最佳去除条件为：加入量为6.67 mL L -1，反应时间为45.26 min，氯酸盐的初始浓度为3.08 mg L -1。和剂量9.62 mL L-1，反应时间46.36分钟，亚氯酸盐的初始浓度为3.04 mg L -1。根据结果，吸附剂剂量与氯酸盐或亚氯酸盐浓度和反应时间有很强的相互作用，这对使用MIEX优化氯酸盐和亚氯酸盐脱除工艺有重要影响。根据FTIR光谱，氯酸盐和亚氯酸盐的吸附机理是阴离子交换。
更新日期：2020-01-03
中文翻译：
响应面法指导氯酸盐和亚氯酸盐在MIEX树脂上的吸附以及化学性质的研究
本研究研究了MIEX树脂对氯酸盐和亚氯酸盐的吸附行为，并通过响应面法确定了去除率的最佳条件。溶液的化学性质（例如pH值，共存阴离子和离子强度）对氯酸盐和亚氯酸盐的吸附有很大影响。MIEX对氯酸盐和亚氯酸盐的吸附能力分别为525和398 mg L -1， 分别。当pH值接近中性时，MIEX上氯酸盐和亚氯酸盐的去除率最好。硫酸根自由基对MIEX上氯酸盐和亚氯酸盐的吸附具有破坏性影响，导致吸附能力低。氯酸盐和亚氯酸盐在MIEX上的初始吸附动力学遵循颗粒内扩散控制的吸附。Box-Behnken设计方法已成功用于建立二次多项式模式，以预测氯酸盐和亚氯酸盐的去除效率，该模式由三个变量（吸附剂剂量，反应时间和初始浓度）组成。最佳去除条件为：加入量为6.67 mL L -1，反应时间为45.26 min，氯酸盐的初始浓度为3.08 mg L -1。和剂量9.62 mL L-1，反应时间46.36分钟，亚氯酸盐的初始浓度为3.04 mg L -1。根据结果，吸附剂剂量与氯酸盐或亚氯酸盐浓度和反应时间有很强的相互作用，这对使用MIEX优化氯酸盐和亚氯酸盐脱除工艺有重要影响。根据FTIR光谱，氯酸盐和亚氯酸盐的吸附机理是阴离子交换。
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