title: Preparation and characterization of a hierarchical porous char from sewage sludge with superior adsorption capacity for toluene by a new two-step pore-fabricating process.
abstract: A kind of hierarchical porous char (SCCA/Zn) was prepared from sewage sludge by a new two-step pore-fabricating process coupling citric acid (CA) with ZnCl2 in a pyrolysis process. The char was characterized by element analysis, N2-adsorption and mercury intrusion measurement etc. It is found that coupling CA and ZnCl2 can synergistically fabricate pores in the pyrolysis process, resulting in a hierarchical porous char, SCCA/Zn, with the largest SBET of 867.6 m(2) g(-1) due to the fact that the former contributes to the fabrication of macro-pores, which provides more space for fabricating meso- and micro-pores by ZnCl2 activation. Although the SBET of SCCA/Zn was 15% less than that of activated carbon fiber (ACF, SBET=999.5 m(2) g(-1)), SCCA/Zn had a higher toluene adsorption capacity (0.83 g g(-1)) than ACF. The inconsistence between their SBET and adsorption capacity can be ascribed to the strong hydrophobic property of SCCA/Zn.
authors: School of Environmental Science and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors: Lingjun
authors: L
authors: Kong
authors: School of Environmental Science and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, PR China. Electronic address: cesxya@mail.sysu.edu.cn.
authors: Ya
authors: Y
authors: Xiong
authors: School of Environmental Science and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, PR China.
authors: Shuanghong
authors: S
authors: Tian
authors: School of Environmental Science and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors: Rongshu
authors: R
authors: Luo
authors: School of Environmental Science and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, PR China.
authors: Chun
authors: C
authors: He
authors: School of Environmental Science and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, PR China.
authors: Haibao
authors: H
authors: Huang
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D002118:Calcium / Q000737:chemistry; D002712:Chlorides / Q000737:chemistry*; D019343:Citric Acid / Q000737:chemistry; D005740:Gases; D006868:Hydrolysis; D057927:Hydrophobic and Hydrophilic Interactions; D009584:Nitrogen / Q000737:chemistry; D016062:Porosity; D012722:Sewage; D013499:Surface Properties; D013696:Temperature; D014050:Toluene / Q000737:chemistry*; D062065:Wastewater; D018508:Water Purification / Q000379:methods; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D002118:Calcium; D002712:Chlorides; D019343:Citric Acid; D005740:Gases; D009584:Nitrogen; D012722:Sewage; D014050:Toluene; D062065:Wastewater; D017967:Zinc Compounds; C016837:zinc chloride
keywords: Adsorption; Hierarchical pores; Hydrophobic; Sludge-derived char; Toluene