Issue 9, 2020

Response surface methodology directed adsorption of chlorate and chlorite onto MIEX resin and study of chemical properties

Abstract

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.

Graphical abstract: Response surface methodology directed adsorption of chlorate and chlorite onto MIEX resin and study of chemical properties

Supplementary files

Article information

Article type
Paper
Submitted
09 nov 2019
Accepted
02 jan 2020
First published
03 jan 2020

Environ. Sci.: Water Res. Technol., 2020,6, 2454-2464

Response surface methodology directed adsorption of chlorate and chlorite onto MIEX resin and study of chemical properties

Y. Yang, Z. Zheng, D. Zhang and X. Zhang, Environ. Sci.: Water Res. Technol., 2020, 6, 2454 DOI: 10.1039/C9EW01003C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements