Microwave synthesis and adsorption performance of a novel crosslinked starch microsphere.
A new crosslinked starch microsphere (CSM) was synthesized in a microwave-assisted inversed emulsion system with soluble starch (ST) as a raw material, MBAA as a crosslinker, and K2S2O8-NaHSO3 as an initiator. The synthesized starch microsphere was characterized and examined by scanning electron microscope (SEM), FTIR spectroscopy and adsorption isotherms of N2 at 77K. Adsorption performance was investigated in methyl violet solution. The results showed that the maximum adsorption capacity for MV was 99.3mg/g at 298 K, and the adsorption fitted pseudo-second-order kinetic model well with correlation coefficients greater than 0.99. The isothermal data obeyed the Langmuir model better compared to Freundlich model and Tempkin model, and the adsorption was exothermic and spontaneous. pH variations (2.0-10.0) did not significantly affect the adsorption of MV onto CSM.
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China; National Engineering Laboratory for Rice and By-Product Deep Processing, Center South University of Forestry and Technology, Changsha 41004, PR China. Electronic address: qintlin@163.com.
Qintie
Q
Lin
Jianxin
J
Pan
Qinlu
Q
Lin
Qianjun
Q
Liu
D000327:Adsorption; D003432:Cross-Linking Reagents / Q000737:chemistry*; D004058:Diffusion; D005840:Gentian Violet / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D008872:Microwaves; D009584:Nitrogen / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000295:instrumentation*
D003432:Cross-Linking Reagents; D014874:Water Pollutants, Chemical; D013213:Starch; D005840:Gentian Violet; D009584:Nitrogen
Adsorption; Crosslinked starch microsphere; Methyl violet; Microwave