Recycling application of waste long-root Eichhornia crassipes in the heavy metal removal using oxidized biochar derived as adsorbents

Sen Lin; Weiwei Huang; Hongjun Yang; Shuying Sun; Jianguo Yu

doi:10.1016/j.biortech.2020.123749

Recycling application of waste long-root Eichhornia crassipes in the heavy metal removal using oxidized biochar derived as adsorbents

Bioresour Technol. 2020 Oct:314:123749. doi: 10.1016/j.biortech.2020.123749. Epub 2020 Jun 27.

Authors

Sen Lin¹, Weiwei Huang², Hongjun Yang³, Shuying Sun⁴, Jianguo Yu¹

Affiliations

¹ National Engineering Research Center for Integrated Utilization of Salt Lake Resources, East China University of Science and Technology, Shanghai 200237, China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.
² College of Ecology and Environment, Hainan University, Haikou 570228, China.
³ Yunnan Research Institute of Ecological Agriculture, Yunnan 610203, China.
⁴ National Engineering Research Center for Integrated Utilization of Salt Lake Resources, East China University of Science and Technology, Shanghai 200237, China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China. Electronic address: [email protected].

PMID: 32623285
DOI: 10.1016/j.biortech.2020.123749

Abstract

An oxidized biochar was prepared using long-root Eichhornia crassipes through an aerobic/anaerobic hybrid calcination to recycle its waste plants after eutrophic treatments. The adsorption performances of the biochar were investigated and the results showed that the adsorption equilibrium could arrive in 30 min and the adsorption capacities for Pb²⁺, Cu²⁺, Cd²⁺ and Zn²⁺ at 30 °C were 0.57, 0.41, 0.44 and 0.48 mmol/g, respectively. The adsorption could be promoted at higher pH and temperature and the adsorption tolerance for different heavy metal ions to the existence of competing ions and organic matters was hierarchical. The adsorption was deduced to be heterozygous courses and mainly controlled by complexation of oxygen-containing groups with these heavy metal ions. It was confirmed that the biochar could be regenerated with HCl solution and the adsorption performance kept consistent in 10 adsorption-desorption cycles.

Keywords: Adsorption; Heavy metal; Long-root Eichhornia crassipes; Oxidized biochar; Recycling application.

MeSH terms

Adsorption
Charcoal
Eichhornia*
Metals, Heavy*
Water Pollutants, Chemical / analysis*

Substances

Metals, Heavy
Water Pollutants, Chemical
biochar
Charcoal