Abstract：The chitosan (CS) and graphene oxide (GO) synthesized with the modified hummers method were used as raw material to prepare CS-GO composites by chemical crosslinking. Then the magnetic chitosan/graphene oxide (MCSGO) composite absorbent material was prepared by chemical co-precipitation method. The structure and functional groups of MCSGO were characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The adsorption property and adsorption mechanism of Pb(II) in water on MCSGO were studied. The results showed that CS was cross-linked with GO via NH-CO bond. The CS-GO was successfully endowed magnetic property by loading Fe3O4. The adsorption equilibrium could be reached at room temperature within 90 min under the following conditions: the initial mass concentration of Pb(II) was 50mg/L, the dosage of adsorbent was 0.04g and the pH was 5. The equilibrium adsorption capacity was 60.99mg/g. The adsorption behavior of Pb(II) on MCSGO could be described using pseudo-second-order kinetics model and Langmuir isotherm model. It indicated that this adsorption process was the chemical monolayer adsorption of homogeneous surface. The experimental results of magnetic separation under external magnetic field showed that MCSGO had good magnetic recyclability. Hydrochloric acid was used as desorption reagent for the regeneration of MCSGO. The adsorption capacity of Pb(II) on MCSGO only decreased by 16.72% after recycling for six times, indicating the MCSGO had excellent performance of regeneration.
常会, 范文娟, 曾成华, 李艳萍. 磁性壳聚糖/氧化石墨烯吸附材料的制备及其对Pb(II)的吸附[J]. 冶金分析, 2018, 38(11): 34-42.
CHANG Hui, FAN Wen-juan, ZENG Cheng-hua, LI Yan-ping. Preparation of magnetic chitosan/graphene oxide composites and its adsorption performance to Pb(II). , 2018, 38(11): 34-42.
Huang X M,Pan M.The highly efficient adsorption of Pb(II) on graphene oxides: A process combined by batch experiments and modeling techniques[J].Journal of Molecular Liquids,2016,215:410-416.
[2]
Xu W B,Song Y,Dai K,et al.Novel ternary nanohybrids of tetraethylenepentamine and graphene oxide decorated with MnFe2O4 magnetic nanoparticles for the adsorption of Pb(II)[J].Journal of Hazardous Materials,2018,358:337-345.
[3]
Thanh H T M,Phuong T T T,Hang P T L,et al.Comparative study of Pb(II) adsorption onto MIL-101 and Fe-MIL-101 from aqueous solutions[J].Journal of Environmental Chemical Engineerin,2018,6(4):4093-4102.
[4]
Wang G Y,Zhang S R,Yao P,et al.Removal of Pb(II) from aqueous solutions by Phytolacca americana L. biomass as a low cost biosorbent[J].Arabian Journal of Chemistry,2018,11(1):99-110.
[5]
Wang X,Wang Y,Wang X J,et al.Adsorption of Pb(II) from aqueous solution to Ni-doped bamboo charcoal[J].Journal of Industrial and Engineering Chemistry,2013,19:353-359.
[6]
Hu Z H,Omer A M,Ouyang X K,et al.Fabrication of carboxylated cellulose nanocrystal/sodium alginate hydrogel beads for adsorption of Pb(II) from aqueous solution[J].International Journal of Biological Macromolecules,2018,108:149-157.
[7]
王敏,陈爱侠,陈贝.壳聚糖/氧化石墨烯复合材料对Cr(VI)吸附性能研究[J].环境保护科学,2018,44(2):51-56.WANG Min,CHEN Ai-xia,CHEN Bei.Study of the adsorption performance of Cr(VI) by chitosan/graphene oxide composite material[J].Environmental Protection Science,2018,44(2):51-56.
[8]
Anitha T,Kumar P S,Kumar K S,et al.Adsorptive removal of Pb(II) ions from polluted water by newly synthesized chitosan-polyacrylonitrile blend:equilibrium,kinetic,mechanism and thermodynamic approach[J].Process Safety and Environmental Protection,2015,98:187-197.
[9]
Liu B J,Chen W,Peng X N,et al.Biosorption of lead from aqueous solutions by ion-imprinted tetraethylenepentamine modified chitosan beads[J].International Journal of Biological Macromolecules,2016,86:562-569.
[10]
Javanbakht V,Ghoreishi S M,Habibi N,et al.A novel magnetic chitosan/clinoptilolite/magnetite nanocomposite for highly efficient removal of Pb(II) ions from aqueous solution[J].Powder Technology,2016,302:372-383.
[11]
Kuang S P,Wang Z Z,Liu J,et al.Preparation of triethylene-tetramine grafted magnetic chitosan for adsorption of Pb(II) ion from aqueous solutions[J].Journal of Hazardous Material,2013,260(18):210-219.
[12]
龚育,孔亚飞,马真真,等.氧化石墨烯/壳聚糖复合微球的制备及其对铌的吸附性能[J].冶金分析,2017,37(8):15-20.GONG Yu,KONG Ya-fei,MA Zhen-zhen,et al.Preparation of graphene oxide/chitosan composite beads and its adsorption performance for nibium[J].Metallurgical Analysis,2017,37(8):15-20.
[13]
Li M F,Liu Y G,Liu S B,et al.Performance of magnetic graphene oxide/diethylenetriaminepentaacetic acid nanocomposite for the tetracycline and ciprofloxacin adsorption in single and binary systems[J].Journal of Colloid and Interface Science,2018,521:150-159.
[14]
闫洪志,杨晓超,张斌,等.磁性氧化石墨烯对水中Pb2+吸附性能的研究[J].黑龙江大学自然科学学报,2016,33(5):656-663.YAN Hong-zhi,YANG Xiao-chao,ZHANG Bin,et al.Adsorption properties of magnetic graphene oxide for Pb2+ in water[J].Journal of Natural Science of Heilongjiang University,2016,33(5):656-663.
[15]
张连科,刘心宇,王维大,等.油料作物秸秆生物炭对水体中铅离子的吸附特性与机制[J].农业工程学报,2018,34(7):218-226.ZHANG Lian-ke,LIU Xin-yu,WANG Wei-da,et al.Characteristics and mechanism of lead adsorption from aqueous solutions by oil crops straw-derived biochar[J].Transactions of the Chinese Society of Agricultural Engineering,2018,34(7):218-226.
[16]
Wang N,Jin R N,Omer A M,et al.Adsorption of Pb(II) from fish sauce using carboxylated cellulose nanocrystal:isotherm,kinetics,and thermodynamic studies[J].International Journal of Biological Macromolecules,2017,102:232-240.
[17]
Araujo C S T,Almeida I LS,Rezende H C,et al.Elucidation of mechanism involved in adsorption of Pb(II) onto lobeira fruit(solanum lycocarpum) using Langmuir, Freundlich and Temkin isotherms[J].Microchemical Journal,2018,137:348-354.
[18]
Yang J B,Yu M Q,Qiu T.Adsorption thermodynamics and kinetics of Cr(VI) on KIP210 resin[J].Journal of industrial and Engineering Chemistry,2014,20(2):480-486.
