Fabrication of mesoporous lignin-based biosorbent from rice straw and its application for heavy-metal-ion removal  

作　　者：Fang Xu Ting-Ting Zhu qing-quan Rao Sheng-Wen Shui Wen-Wei Li Hong-Bo He Ri-Sheng Yao 

机构地区：[1]School of Medical Engineering,Hefei University of Technology,Hefei 230009,China [2]CAS Key Laboratory of Urban Pollutant Conuersion,Department of Chemistry,University of Science&Technology of China,Hefei 230026,China [3]Environmental Monitoring Center of Taizhou,Taizhou 31800,China

出　　处：《Journal of Environmental Sciences》2017年第3期132-140,共9页环境科学学报（英文版）

基　　金：the National Science Foundation of China(No.21207031);the National High Technology Research of China(863)(No.2014AA021902)for the partial support of this study

摘　　要：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 SOB micro-thermal-explosion process, as a byproduct of microcrystalline cellulose. BET analysis reveal the average pore-size distribution of 5.50 nm, the average pore value of 0.35 cm3/g, and the specific surface area of 186 m2/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 sutfonic 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 SO3 micro-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.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 SOB micro-thermal-explosion process, as a byproduct of microcrystalline cellulose. BET analysis reveal the average pore-size distribution of 5.50 nm, the average pore value of 0.35 cm3/g, and the specific surface area of 186 m2/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 sutfonic 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 SO3 micro-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.

关 键 词：Lignocellulosic biomassMesoporous biosorbentRice strawLigninSulfur trioxideMicro-thermal-explosion 

分 类 号：X712[环境科学与工程—环境工程] X703