title: Removal of copper(II) using deacetylated konjac glucomannan conjugated soy protein isolate.
abstract: In this study, an environmentally friendly biosorbent deacetylated konjac glucomannan conjugated soy protein isolate (abbreviated as DKGM-C-SPI) was prepared for Cu(2+) ions removal from aqueous solution. Scanning electron microscopy, Fourier transform infrared spectroscopy and zeta potential analysis revealed successful conjugation of soy protein isolate (SPI) onto deacetylated konjac glucomannan (DKGM) matrix. A comparative adsorption performance of DKGM-C-SPI and DKGM was tested to remove Cu(2+) ions from aqueous solution. DKGM-C-SPI showed the desired adsorption performance for Cu(2+) ions. The adsorption equilibrium of DKGM-C-SPI was achieved within 30 min. The adsorption behavior of DKGM-C-SPI followed a pseudo-second-order reaction model. The maximum Cu(2+) ion adsorption capacities obtained from the Langmuir isotherms fit were shown to be 62.50 mg g(-1) for DKGM-C-SPI and 12.23 mg g(-1) for DKGM. This impressive increase about 5 times in Cu(2+) ion adsorption capacity is attributed to the strong Cu(2+) ion chelating ability of the soy protein isolate (SPI) on the DKGM matrix. These results confirm that the DKGM-C-SPI biosorbent has a potential for Cu(2+) ion extraction from wastewater.
authors.affiliation: College of Applied Chemical Engineering, Shunde Polytechnic, Foshan 528333, PR China. Electronic address: liufenglf_2003@qq.com.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.affiliation: College of Applied Chemical Engineering, Shunde Polytechnic, Foshan 528333, PR China.
authors.forename: Hailiang
authors.initials: H
authors.lastname: Zou
authors.affiliation: College of Applied Chemical Engineering, Shunde Polytechnic, Foshan 528333, PR China.
authors.forename: Jianbing
authors.initials: J
authors.lastname: Peng
authors.affiliation: Key Laboratory of Cellulose Lignocellulosics Chemistry, Chinese Academy of Sciences, Guangzhou 510650, PR China.
authors.forename: Jinwen
authors.initials: J
authors.lastname: Hu
authors.affiliation: College of Applied Chemical Engineering, Shunde Polytechnic, Foshan 528333, PR China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Liu
authors.affiliation: College of Applied Chemical Engineering, Shunde Polytechnic, Foshan 528333, PR China.
authors.forename: Yanwu
authors.initials: Y
authors.lastname: Chen
authors.affiliation: College of Applied Chemical Engineering, Shunde Polytechnic, Foshan 528333, PR China.
authors.forename: Fenghui
authors.initials: F
authors.lastname: Lu
mesh_terms: D000107:Acetylation; D000327:Adsorption; D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification*; D055772:Green Chemistry Technology; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008351:Mannans / Q000737:chemistry*; D030262:Soybean Proteins / Q000737:chemistry*; D014875:Water Pollutants, Radioactive / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: D008351:Mannans; D030262:Soybean Proteins; D014875:Water Pollutants, Radioactive; C022901:(1-6)-alpha-glucomannan; D003300:Copper
keywords: Copper removal; Konjac glucomannan; Soy protein isolate