title: Facile fabrication of magnetic carboxymethyl starch/poly(vinyl alcohol) composite gel for methylene blue removal.
abstract: This study presents a simple method to fabricate magnetic carboxymethyl starch/poly(vinyl alcohol) (mCMS/PVA) composite gel. The obtained mCMS/PVA was characterized by Fourier transform infrared (FTIR) spectra, vibrating-sample magnetometer (VSM) and scanning electron microscopy (SEM) measurements. The application of mCMS/PVA as an adsorbent for removal of cationic methylene blue (MB) dye from water was investigated. Benefiting from the combined merits of carboxymethyl starch and magnetic gel, the mCMS/PVA simultaneously exhibited excellent adsorption property toward MB and convenient magnetic separation capability. The effects of initial dye concentration, contact time, pH and ionic strength on the adsorption performance of mCMS/PVA adsorbent were investigated systematically. The adsorption process of mCMS/PVA for MB fitted pseudo-second-order model and Freundlich isotherm. Moreover, desorption experiments revealed that the mCMS/PVA adsorbent could be well regenerated in ethanol solution without obvious compromise of removal efficiency even after eight cycles of desorption/adsorption. Considering the facile fabrication process and robust adsorption performance, the mCMS/PVA composite gel has great potential as a low cost adsorbent for environmental decontamination.
authors.affiliation: Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Nonferrous Metal and Featured Materials, Key Laboratory of New Processing Technology for Nonferrous Metal and Materials (Ministry of Education), Guilin University of Technology, Guilin 541004, PR China; College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, PR China.
authors.forename: Guisheng
authors.initials: G
authors.lastname: Gong
authors.affiliation: Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Nonferrous Metal and Featured Materials, Key Laboratory of New Processing Technology for Nonferrous Metal and Materials (Ministry of Education), Guilin University of Technology, Guilin 541004, PR China; College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, PR China. Electronic address: zhangfaai@163.com.
authors.forename: Faai
authors.initials: F
authors.lastname: Zhang
authors.affiliation: Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Nonferrous Metal and Featured Materials, Key Laboratory of New Processing Technology for Nonferrous Metal and Materials (Ministry of Education), Guilin University of Technology, Guilin 541004, PR China; College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, PR China.
authors.forename: Zehong
authors.initials: Z
authors.lastname: Cheng
authors.affiliation: Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Nonferrous Metal and Featured Materials, Key Laboratory of New Processing Technology for Nonferrous Metal and Materials (Ministry of Education), Guilin University of Technology, Guilin 541004, PR China; College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, PR China. Electronic address: zhouli@glut.edu.cn.
authors.forename: Li
authors.initials: L
authors.lastname: Zhou
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry; D005782:Gels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry*; D009994:Osmolar Concentration; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000031:analogs & derivatives* / Q000737:chemistry; D013696:Temperature
chemical_list: D004396:Coloring Agents; D005782:Gels; D058185:Magnetite Nanoparticles; D011142:Polyvinyl Alcohol; D013213:Starch; C034848:carboxymethyl starch; D008751:Methylene Blue
keywords: Carboxymethyl starch; Dye adsorption; Magnetic composite gel