Cho Dong-Wan, Yoon Kwangsuk, Kwon Eilhann E, Biswas Jayanta Kumar, Song Hocheol
Department of Environment and Energy, Sejong University, Seoul 05006, South Korea.
Pollution, Ecotoxicology and Ecotechnology Research Unit, Department of Ecological Studies, University of Kalyani, Kalyani, Nadia 741235, West Bengal, India.
Environ Pollut. 2017 Oct;229:942-949. doi: 10.1016/j.envpol.2017.07.079. Epub 2017 Aug 1.
This study investigated the preparation of magnetic biochar from N- and CO-assisted pyrolysis of spent coffee ground (SCG) for use as an adsorption medium for As(V), and the effects of FeCl pretreatment of SCG on the material properties and adsorption capability of the produced biochar. Pyrolysis of FeCl-pretreated SCG in CO atmosphere produced highly porous biochar with its surface area ∼70 times greater than that produced in N condition. However, despite the small surface area, biochar produced in N showed greater As(V) adsorption capability. X-ray diffraction and X-ray photoelectron spectrometer analyses identified FeC and FeO as dominant mineral phases in N and CO conditions, with the former being much more adsorptive toward As(V). The overall results suggest functional biochar can be facilely fabricated by necessary pretreatment to expand the applicability of biochar for specific purposes.
本研究调查了通过N和CO辅助热解废咖啡渣（SCG）制备磁性生物炭用作As(V)的吸附介质，以及SCG的FeCl预处理对所制备生物炭的材料特性和吸附能力的影响。在CO气氛中对FeCl预处理的SCG进行热解产生了高度多孔的生物炭，其表面积比在N条件下产生的生物炭大~70倍。然而，尽管表面积较小，但在N条件下产生的生物炭显示出更大的As(V)吸附能力。X射线衍射和X射线光电子能谱分析确定FeC和FeO是N和CO条件下的主要矿物相，前者对As(V)的吸附性更强。总体结果表明，通过必要的预处理可以轻松制备功能性生物炭，以扩大生物炭在特定用途上的适用性。
