Fabrication of magnetic macroporous chitosan-g-poly (acrylic acid) hydrogel for removal of Cd2+and Pb2.
A novel macroporous magnetic macroporous chitosan-g-poly (acrylic acid) hydrogel adsorbent was fabricated from the Pickering high internal emulsions template stabilized by modified Fe3O4nanoparticles. The structure and composition of modified Fe3O4and macroporous magnetic hydrogel were characterized by TEM, XRD, TG and SEM techniques. The characterization results suggest that the Fe3O4nanoparticles have been modified successfully with organosilane of 3-aminopropyltrimethoxysilane (APTES), and the porous structure of the macroporous hydrogel can be tuned with the amount of stabilized particles, volume fraction of dispersed phase and the amount of the cosurfactant. Adsorption experiments indicate that the adsorption equilibrium was rapidly reached within 20min and the maximal adsorption capacities were determined to be 308.84mg/g for Cd2+and 695.22mg/g for Pb2+. After five adsorption-desorption cycles, the adsorbent can retain its high adsorption capacity. The introduction of Fe3O4is beneficial to the recycle of adsorbent after usage.
Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou, 730000, PR China; Graduate University of the Chinese Academy of Sciences, Beijing, 100049, PR China.
Yongfeng
Y
Zhu
Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou, 730000, PR China; Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China. Electronic address: zhengya@lzu.edu.cn.
Yian
Y
Zheng
Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou, 730000, PR China; Graduate University of the Chinese Academy of Sciences, Beijing, 100049, PR China.
Feng
F
Wang
Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou, 730000, PR China. Electronic address: aqwang@licp.cas.cn.
Aiqin
A
Wang
D000180:Acrylic Resins / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D020100:Hydrogels / Q000138:chemical synthesis / Q000737:chemistry; D007854:Lead / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D000180:Acrylic Resins; D020100:Hydrogels; D002104:Cadmium; D007854:Lead; C006903:carbopol 940; D048271:Chitosan; D052203:Ferrosoferric Oxide
Adsorption; Heavy metal; Macroporous hydrogel; Magnetic; Pickering-HIPEs