Renewable and efficient removal of arsenic from contaminated water by modified biochars derived from As-enriched plant

Mengxi Feng; Xin Zhang; Qingling Fu; Hongqing Hu; Fei Miao; Chaojun Huang; Jun Zhu

doi:10.1016/j.biortech.2023.129680

Renewable and efficient removal of arsenic from contaminated water by modified biochars derived from As-enriched plant

Bioresour Technol. 2023 Nov:387:129680. doi: 10.1016/j.biortech.2023.129680. Epub 2023 Aug 14.

Authors

Mengxi Feng¹, Xin Zhang², Qingling Fu³, Hongqing Hu², Fei Miao², Chaojun Huang¹, Jun Zhu²

Affiliations

¹ Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, Hubei Province, China.
² Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, Hubei Province, China; Hubei Key Laboratory of Soil Environment and Pollution Remediation, Huazhong Agricultural University, Wuhan 430070, China.
³ Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, Hubei Province, China; Hubei Key Laboratory of Soil Environment and Pollution Remediation, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: fuqingling@mail.hzau.edu.cn.

PMID: 37586434
DOI: 10.1016/j.biortech.2023.129680

Abstract

There were limited researches on the scientific disposal of As-enriched plants, and how to reduce the available As content in the processed products and improve the utilization value were the key. In this study, the effect and mechanism of biochar produced by the As-enriched Pteris vittate before and after modification on the removal of As(III) in water were studied. The results indicated that the available As contents of Fe-BC300 and Fe-BC500 were reduced by 78.7 % and 91.9 % compared to original biochars, respectively. Modified biochars not only had a large adsorption capacity for As(III) (50.3 and 39.7 mg/g), but also can efficiently oxidize As(III) to As(V). The removal rate of As(III) by modified biochar was still higher than 50% after 3 cycles. The increase of the point of zero charge and the introduction of Fe were the main reasons for its efficient adsorption and oxidation of As(III).

Keywords: Arsenic; Harmlessness; Iron modified biochar; Pteris vittata; Resource utilization.

MeSH terms

Adsorption
Arsenic*
Charcoal
Oxidation-Reduction
Water Pollutants, Chemical*

Substances

Arsenic
biochar
Charcoal
Water Pollutants, Chemical