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Preparation of Mn/Ti-modified zeolite and its performance for removing iron and manganese

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Abstract

Excessive iron and manganese presented in groundwater sources may cause harm to human health that needs to be solved urgently. This research aims to develop high-performance Mn/Ti-modified zeolites using sol-gel method and hydrothermal synthesis method to remove Fe2+ and Mn2+ simultaneously. The preparation parameters were optimized by response surface methodology, and the results confirmed that the optimal preparation conditions were as follows: mass ratio of MnO2-TiO2/zeolite = 1, hydrothermal temperature = 200°C, and calcination temperature = 500°C. The results of batch adsorption experiments showed that the best removal rate of Fe2+ and Mn2+ by modified zeolite materials which was prepared under the optimum conditions reached 96.8% and 94.4%, respectively, at which the saturated adsorption capacity was 2.80 mg/g and 1.86 mg/g. Through the adsorption kinetics, thermodynamics, internal diffusion, and isothermal adsorption analyses, it is confirmed that the adsorption process of Fe2+ and Mn2+ by the modified zeolite is mainly chemical adsorption. The results of the Weber-Morris internal diffusion model prove that internal diffusion is not the only step that controls the adsorption process. In addition, combined with the characterization of the composite-modified zeolite and the adsorption experimental study, it shows that there is an autocatalytic reaction in the adsorption process.

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Funding

This work was financially supported by the National Key R&D Program of China (No. 2018YFC0406400) and the National Natural Science Foundation of China (No. 52170096).

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Contributions

Guirong Sun: literature search, organization of the manuscript, and manuscript writing.

Xuelu Shi: conceptualization and resources.

Chunhui Zhang and Yuanhui Tang: critically revised the work.

Bingxu Quan, Nan Xiao, and Yizhen Zhang: collection and summarization of the literature.

Jinghua Tong and Wenqian Wang: investigation.

Binhu Xiao and Chunyu Zhang: manuscript inspection and confirmation.

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Correspondence to Chunhui Zhang.

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The authors declare no competing interests.

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Responsible Editor: Tito Roberto Cadaval Jr

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Zhang, C., Sun, G., Quan, B. et al. Preparation of Mn/Ti-modified zeolite and its performance for removing iron and manganese. Environ Sci Pollut Res 29, 80581–80596 (2022). https://doi.org/10.1007/s11356-022-21309-4

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  • DOI: https://doi.org/10.1007/s11356-022-21309-4

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