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

被引:185
作者
Chen, Youyuan
Wang, Baoying
Xin, Jia [1 ]
Sun, Ping
Wu, Dan
机构
[1] Ocean Univ China, Key Lab Marine Environm & Ecol, Minist Educ, Qingdao 266100, Peoples R China
关键词
Enteromorpha prolifera; Magnetic biochar; Adsorption; Cr(VI); AQUEOUS-SOLUTION; MAGNETIC BIOCHAR; HEXAVALENT CHROMIUM; HYDROTHERMAL CARBONIZATION; PARTICLE-SIZE; BIO-CHAR; REMOVAL; PYROLYSIS; SORPTION; CARBON;
D O I
10.1016/j.ecoenv.2018.08.024
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 gamma-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.
引用
收藏
页码:440 / 447
页数:8
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