Adsorption behavior and mechanism of Cr(VI) by modified biochar derived from Enteromorpha prolifera

Youyuan Chen; Baoying Wang; Jia Xin; Ping Sun; Dan Wu

doi:10.1016/j.ecoenv.2018.08.024

Adsorption behavior and mechanism of Cr(VI) by modified biochar derived from Enteromorpha prolifera

Ecotoxicol Environ Saf. 2018 Nov 30:164:440-447. doi: 10.1016/j.ecoenv.2018.08.024. Epub 2018 Aug 22.

Authors

Youyuan Chen¹, Baoying Wang¹, Jia Xin², Ping Sun¹, Dan Wu¹

Affiliations

¹ Key Laboratory of Marine Environment and Ecology, Ministry of Education; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering (MEGE); College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
² Key Laboratory of Marine Environment and Ecology, Ministry of Education; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering (MEGE); College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China. Electronic address: xinj15@ouc.edu.com.

PMID: 30144704
DOI: 10.1016/j.ecoenv.2018.08.024

Abstract

Biochar that was derived from Enteromorpha prolifera and magnetically modified (BCF600) was evaluated for its physicochemical properties and Cr(VI) adsorption behavior and mechanism. The results showed that the modified biochar was less porous on surface and loaded with γ-Fe₂O₃ particles. BCF600 exhibited a maximum adsorption capacity for Cr(VI), which acquired from the Langmuir model of 88.17 mg g^-1 and a removal efficiency of 97.71%, for 100 mg L^-1 of Cr(VI). The adsorption of Cr(VI) by BCF600 decreased with increasing pH and background ion intensity. Based on the FTIR results, the change in the -OH groups on the surface after adsorption confirmed that electrostatic interaction was likely the preponderant mechanism. In addition, the BCF600 could be easily separated using a magnet and displayed high recyclability. Therefore, this magnetic biochar derived from Enteromorpha prolifera has the potential to serve as a highly efficient adsorbent for water pollution control.

Keywords: Adsorption; Cr(VI); Enteromorpha prolifera; Magnetic biochar.

MeSH terms

Adsorption
Charcoal / chemistry*
Chromium / analysis*
Chromium / chemistry
Ferrous Compounds / chemistry
Kinetics
Magnetic Phenomena
Recycling
Ulva*
Water Pollutants, Chemical / analysis*
Water Pollutants, Chemical / chemistry

Substances

Ferrous Compounds
Water Pollutants, Chemical
biochar
Chromium
Charcoal
chromium hexavalent ion