SUN Rongguo1,2, FAN Li3, YIN Xiaogang1, CHEN Zhuo1, LI Qiuhua1, WANG Jun1, JIANG Zeen1
（1. School of Chemistry and Material, Guizhou Normal University, Guiyang 550025, China;
2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
3. Library of Guizhou Normal University, Guiyang 550025, China）
Abstract: Banana peel was selected as sorbent to identify its mercury sorption ability under various conditions, such as dosage, particle size, pH, sorption time, reaction temperature and the initial mercury concentration. The results indicated that the mercury removal efficiency increased with increased dosage, smaller particle size, higher pH, higher reaction temperature, and lower mercury initial concentration. The mercury removal efficiencies were found to be more than 90% when dosage ≥ 0.075 g, particle size ≥ 60 mesh, pH ≥ 5, initial mercury concentration ≤ 200 mg/L, and temperature ≥23℃. Sorption models of Langmuir, Freundlich and Temkin are all adequate to fit the sorption process. The sorption reaction, a spontaneous endothermic reaction, is consistent with the pseudo-second order kinetic model. The sorption process was complex controlled by more influence factors other than the intra-particle diffusion. Banana peel showed an excellent development potential in removing mercury from wastewater because of the high removal rate as well as the low dosage, wide suitable ranges of pH and temperature for the sorption reaction.
Keywords: banana peel; mercury; adsotption; influencing factor; kinetics feature
EARTH AND ENVIRONMENT Vol.46, No.5, Tot No.325, 2018, Page 498-504
