Activated carbon coated palygorskite as adsorbent by activation and its adsorption for methylene blue  

作　　者：Xianlong Zhang Liping Cheng Xueping Wu Yingzhao Tang Yucheng Wu 

机构地区：[1]School of Chemistry and Chemical Engineering, Hefei University of Technology [2]School of Materials Science and Engineering, Hefei University of Technology

出　　处：《Journal of Environmental Sciences》2015年第7期97-105,共9页环境科学学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No. 51002042, No. 40902020 and No. 51072044);the Fundamental Research Funds for the Central Universities (No. 2013HGQC0015);Scientific Research Foundation for the Returned Scholars from Ministry of Education of China (No. 2013JYLH0774);Project from Ministry of Science and Technology of Anhui Province (No. J2014AKKJ0002)

摘　　要：An activation process for developing the surface and porous structure of palygorskite/carbon（PG/C） nanocomposite using ZnC l2 as activating agent was investigated. The obtained activated PG/C was characterized by X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FTIR）, field-emission scanning electron microscopy（SEM）, and Brunauer-Emmett-Teller analysis（BET） techniques. The effects of activation conditions were examined,including activation temperature and impregnation ratio. With increased temperature and impregnation ratio, the collapse of the palygorskite crystal structure was found to accelerate and the carbon coated on the surface underwent further carbonization. XRD and SEM data confirmed that the palygorskite structure was destroyed and the carbon structure was developed during activation. The presence of the characteristic absorption peaks of C_C and C-H vibrations in the FTIR spectra suggested the occurrence of aromatization. The BET surface area improved by more than 11-fold（1201 m2/g for activated PG/C vs. 106 m2/g for PG/C） after activation, and the material appeared to be mainly microporous. The maximum adsorption capacity of methylene blue onto the activated PG/C reached 351 mg/g. The activated PG/C demonstrated better compressive strength than activated carbon without palygorskite clay.An activation process for developing the surface and porous structure of palygorskite/carbon（PG/C） nanocomposite using ZnC l2 as activating agent was investigated. The obtained activated PG/C was characterized by X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FTIR）, field-emission scanning electron microscopy（SEM）, and Brunauer-Emmett-Teller analysis（BET） techniques. The effects of activation conditions were examined,including activation temperature and impregnation ratio. With increased temperature and impregnation ratio, the collapse of the palygorskite crystal structure was found to accelerate and the carbon coated on the surface underwent further carbonization. XRD and SEM data confirmed that the palygorskite structure was destroyed and the carbon structure was developed during activation. The presence of the characteristic absorption peaks of C_C and C-H vibrations in the FTIR spectra suggested the occurrence of aromatization. The BET surface area improved by more than 11-fold（1201 m2/g for activated PG/C vs. 106 m2/g for PG/C） after activation, and the material appeared to be mainly microporous. The maximum adsorption capacity of methylene blue onto the activated PG/C reached 351 mg/g. The activated PG/C demonstrated better compressive strength than activated carbon without palygorskite clay.

关 键 词：Palygorskite/carbon ACTIVATION ADSORPTION Methylene blue Compressive strength 

分 类 号：X703[环境科学与工程—环境工程]