title: Removal of direct dyes from aqueous solution by oxidized starch cross-linked chitosan/silica hybrid membrane.
abstract: In this research, chitosan/oxidized starch/silica (CS/OSR/Silica) hybrid membrane was prepared by using oxidized starch and 3-aminopropyltriethoxysilane (APTES) as cross-linking agents. The characterizations of the hybrid membrane were investigated by using attenuated total reflection (ATR) spectroscopy, scanning electron microscopy (SEM), thermogravimetry (TG) analysis and swelling measurement. The CS/OSR/Silica hybrid membrane exhibited the improved thermal stability and low degree of swelling in water. The adsorption properties of the CS/OSR/Silica hybrid membrane were studied by using two direct dyes (Blue 71 and Red 31). The results indicated the adsorption capacity of the CS/OSR/Silica hybrid membrane was found optimal at pH 9.82 and temperature 60°C for Blue 71 and Red 31. The adsorption kinetic data followed pseudo-second order kinetic model and the adsorption behavior of the two dyes on the hybrid membrane fitted well with the Freundlich model. The CS/OSR/Silica hybrid membrane can be used as an appropriate biosorbent for removal of direct dyes from colored wastewater.
authors.affiliation: College of Textiles and Clothing, Yancheng Institute of Technology, Jiangsu 224003, China. Electronic address: hexuemei@ycit.cn.
authors.forename: Xuemei
authors.initials: X
authors.lastname: He
authors.affiliation: College of Textiles and Clothing, Yancheng Institute of Industry Technology, Jiangsu 224003, China.
authors.forename: Mei
authors.initials: M
authors.lastname: Du
authors.affiliation: College of Textiles and Clothing, Yancheng Institute of Technology, Jiangsu 224003, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: College of Textiles and Clothing, Yancheng Institute of Technology, Jiangsu 224003, China.
authors.forename: Tianchi
authors.initials: T
authors.lastname: Zhou
mesh_terms: D000327:Adsorption; D002152:Calorimetry, Differential Scanning; D048271:Chitosan / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008567:Membranes, Artificial; D015394:Molecular Structure; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry*; D013696:Temperature; D013818:Thermogravimetry
chemical_list: D004396:Coloring Agents; D008567:Membranes, Artificial; D012996:Solutions; D012822:Silicon Dioxide; D013213:Starch; D048271:Chitosan
keywords: Adsorption; Chitosan; Direct dyes; Hybrid; Oxidized starch