不同温度桉树叶生物炭对Cd<sup>2+</sup>的吸附特性及机制

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Abstract Three types of biochar were generated from eucalyptus leaves under different pyrolysis temperatures of 300,500and 700℃(referred as BC300,BC500 and BC700),and their surface characteristics and Cd (Ⅱ) adsorption processes were investigated using element analysis,BET-N₂,Zeta analysis,Boehm titration,SEM-EDS,FTIR and other analytical methods.The results showed that as pyrolysis temperature increased,the yields decreased,but the ash content,pH,specific surface area and Zeta potential increased.The adsorptive capacity followed in the order of BC700(94.32mg/g),BC500(67.07mg/g) and BC300(60.38mg/g),and both Langmuir and Freundlich models were reasonable to describe the adsorption behavior of BC300and BC500,but Freundlich model was more suitable to describe the adsorption processes of BC700.Adsorption kinetic showed the equilibrium time followed by 540min (BC300),360min (BC500) and 80min (BC700),which were better fitted by pseudo-second order model (R²>0.98) indicating the adsorption was mainly chemical.The results of FTIR and Boehm titration indicated that the spectra of BC700incurred more changes than those of other biochars,which suggested more functional groups were involved in the adsorption including -OH、C=O、C=C、C-O groups.BC700biochar are more effective than other biochars to remove Cd²⁺,which was due to larger specific surface,more negative charge amount and functional groups.Based on the studies above,the removal of Cd²⁺ were mainly by surface electrostatic adsorption and chelation.

Key words： eucalyptus leaves biochar cadmium pyrolysis temperature adsorption characteristics

Received: 28 July 2017

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	GAO Li-yang
	DENG Jin-huan
	TANG Guo-qiang
	HUANG Xiang-neng
	CAI Kun-zheng
	CAI Yi-xia
	HUANG Fei

Cite this article:

GAO Li-yang,DENG Jin-huan,TANG Guo-qiang等. Adsorption characteristics and Mechanism of Cd²⁺on biochar with different pyrolysis temperatures produced from eucalyptus leaves[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(3): 1001-1009.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I3/1001

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