title: Fabrication of mesoporous lignin-based biosorbent from rice straw and its application for heavy-metal-ion removal.
abstract: Lignocellulosic biomass offers the most abundant renewable resource in replacing traditional fossil resources. However, it is still a major challenge to directly convert the lignin component into value-added materials. The availability of plentiful hydroxyl groups in lignin macromolecules and its unique three-dimensional structure make it an ideal precursor for mesoporous biosorbents. In this work, we reported an environmentally friendly and economically feasible method for the fabrication of mesoporous lignin-based biosorbent (MLBB) from lignocellulosic biomass through a SO3micro-thermal-explosion process, as a byproduct of microcrystalline cellulose. BET analysis reveal the average pore-size distribution of 5.50nm, the average pore value of 0.35cm3/g, and the specific surface area of 186m2/g. The physicochemical properties of MLBB were studied by fourier transform infrared spectroscopy (FTIR), attenuated-total-reflection fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and element analysis. These results showed that there are large amounts of sulfonic functional groups existing on the surface of this biosorbent. Pb(II) was used as a model heavy-metal-ion to demonstrate the technical feasibility for heavy-metal-ion removal. Considering that lignocellulosic biomass is a naturally abundant and renewable resource and SO3micro-thermal-explosion is a proven technique, this biosorbent can be easily produced at large scale and become a sustainable and reliable resource for wastewater treatment.
authors.affiliation: School of Medical Engineering, Hefei University of Technology, Hefei 230009, China. Electronic address: Fangxu@hfut.edu.cn.
authors.forename: Fang
authors.initials: F
authors.lastname: Xu
authors.affiliation: School of Medical Engineering, Hefei University of Technology, Hefei 230009, China; CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China.
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Zhu
authors.affiliation: Environmental Monitoring Center of Taizhou, Taizhou 31800, China.
authors.forename: Qing-Quan
authors.initials: QQ
authors.lastname: Rao
authors.affiliation: School of Medical Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Sheng-Wen
authors.initials: SW
authors.lastname: Shui
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China.
authors.forename: Wen-Wei
authors.initials: WW
authors.lastname: Li
authors.affiliation: School of Medical Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Hong-Bo
authors.initials: HB
authors.lastname: He
authors.affiliation: School of Medical Engineering, Hefei University of Technology, Hefei 230009, China. Electronic address: yaors@hfut.edu.cn.
authors.forename: Ri-Sheng
authors.initials: RS
authors.lastname: Yao
mesh_terms: D000327:Adsorption; D002482:Cellulose / Q000737:chemistry; D005374:Filtration / Q000295:instrumentation*; D007700:Kinetics; D008031:Lignin / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D008956:Models, Chemical; D012275:Oryza; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D019216:Metals, Heavy; D002482:Cellulose; D008031:Lignin; C109691:microcrystalline cellulose
keywords: Lignin; Lignocellulosic biomass; Mesoporous biosorbent; Micro-thermal-explosion; Rice straw; Sulfur trioxide