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A comprehensive study on activated carbon prepared from spent shiitake substrate via pyrolysis with ZnCl2

文献类型： 外文期刊

作者： Ma, Yuhui 1 ; Wang, Qunhui 1 ; Wang, Xiaona 1 ; Sun, Xiaohong 2 ; Wang, Xiaoqiang 3 ;

作者机构： 1.Univ Sci & Technol Beijing, Dept Civil & Environm Engn, Beijing 100083, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Beijing Agr Biotechnol Ctr, Beijing 100083, Peoples R China

3.North China Elect Power Univ, Sch Renewable Energy, Natl Engn Lab Biomass Power Generat Equipment, Beijing 102206, Peoples R China

关键词： Spent shiitake substrate;ZnCl2 activation;Characterization;Adsorption;Pyrolysis process

期刊名称：JOURNAL OF POROUS MATERIALS （ 影响因子：2.496； 五年影响因子：2.257 ）

ISSN： 1380-2224

年卷期： 2015 年 22 卷 1 期

页码：

收录情况： SCI

摘要： Activated carbon was produced from spent shiitake substrate (SSS) via ZnCl2 activation. The product was studied by scanning electron microscopy (SEM), N-2-adsorption, Fourier transform infrared spectroscopy and X-ray diffraction (XRD), and its adsorptive behavior was quantified using methylene blue. The pyrolysis of SSS with ZnCl2 was investigated by thermogravimetric analysis, XRD, SEM and energy dispersive X-ray spectrometry. Pyrolysis kinetic was analyzed via Coats-Redfern method. Experimental results demonstrated that the product had surface area of 1,743 m(2) g(-1) and total pore volume of 0.930 cm(3) g(-1). The adsorption equilibrium data followed Langmuir isotherm model with a monolayer adsorption capacity of 408.16 mg g(-1), and pseudo-second-order kinetic model better described the adsorption kinetic. The adsorption mechanism was well described by the intraparticle diffusion model. SSS can transform into a plastic phase during activation, and zinc oxide chloride hydrate (Zn2OCl2 center dot 2H(2)O) was formed above 260 A degrees C. The diffusion of the ZnCl2 gas generated from the decomposition of Zn2OCl2 center dot 2H(2)O around 500 A degrees C was responsible for the porosity development. ZnO was the main zinc-containing matter in the carbon at high pyrolysis temperatures. With the addition of ZnCl2, the activation energy of the pyrolysis of the lignocellulose structure in SSS was reduced to 12.27 kJ mol(-1).

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