Magnetic carboxylated cellulose nanocrystals as adsorbent for the removal of Pb(II) from aqueous solution.
A novel magnetic carboxylated cellulose nanocrystal composite (CCN-Fe3O4) was prepared as an adsorbent for the adsorption of Pb(II) from aqueous solution. The new adsorbent was characterized by transmission electron microscopy, vibrating sample magnetometry, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Batch experiments were carried out to investigate the effects of contact time, adsorbent dose, pH, and temperature on adsorption capacity. Pb(II) adsorption onto CCN-Fe3O4reached equilibrium in 240min, and the maximum adsorption capacity of Pb(II) was 63.78mgg-1at 298.2K. The equilibrium data fitted the Langmuir isotherm model better than the Freundlich isotherm model, and they were well explained in terms of pseudo-second-order kinetics. Thermodynamics studies indicated that the adsorption of Pb(II) onto CCN-Fe3O4was spontaneous and endothermic in nature. The adsorbent could also be regenerated with acid treatment and successfully reapplied.
School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, PR China, PR China.
Jiao
J
Lu
School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, PR China, PR China.
Ru-Na
RN
Jin
School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, PR China, PR China.
Chao
C
Liu
School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, PR China, PR China.
Yan-Fei
YF
Wang
School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, PR China, PR China. Electronic address: xkouyang@zjou.edu.cn.
Xiao-Kun
XK
Ouyang
D000327:Adsorption; D002264:Carboxylic Acids / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000737:chemistry* / Q000302:isolation & purification*; D060328:Magnetic Phenomena; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D012996:Solutions; D013696:Temperature; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
D002264:Carboxylic Acids; D058185:Magnetite Nanoparticles; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D007854:Lead; D002482:Cellulose
Carboxylated cellulose nanocrystal; Lead removal; Magnetic separation