TY - JOUR
T1 - Highly efficient removal of arsenic(III) from aqueous solution by zeolitic imidazolate frameworks with different morphology
AU - Liu, Bao
AU - Jian, Meipeng
AU - Liu, Ruiping
AU - Yao, Jianfeng
AU - Zhang, Xiwang
PY - 2015
Y1 - 2015
N2 - In this study, zeolitic imidazolate frameworks (ZIFs) sorbents with three different morphology (cubic ZIFs, leaf-shaped ZIFs and dodecahedral ZIFs) were successfully synthesized in aqueous solution via green methods at room temperature and tested for removal of As(III). The ZIFs are all high crystalline, and with a BET surface area of 958.4, 12.7 and 1151.2m2/g for cubic ZIFs, leaf-shaped ZIFs and dodecahedral ZIFs, respectively The experiment revealed that all three adsorbents exhibited excellent adsorption capacities of As(III) despite distinct specific surface area and morphology. The adsorption isotherms of cubic ZIFs, leaf-shaped ZIFs and dodecahedral ZIFs were generally fitted by Langmuir model and the maximum adsorption capacities were 122.6, 108.1, 117.5mg/g, respectively at pH 8.5. At initial concentration of 200?g/L, As(III) was rapidly decreased to below 10?g/L by the three ZIFs in 2h at a adsorbent dosage of 0.2g/L. It was found that zinc hydroxyl substitution was the main surface complexation method for As(III) adsorption onto the three ZIFs evidenced by the FTIR and XPS results.
AB - In this study, zeolitic imidazolate frameworks (ZIFs) sorbents with three different morphology (cubic ZIFs, leaf-shaped ZIFs and dodecahedral ZIFs) were successfully synthesized in aqueous solution via green methods at room temperature and tested for removal of As(III). The ZIFs are all high crystalline, and with a BET surface area of 958.4, 12.7 and 1151.2m2/g for cubic ZIFs, leaf-shaped ZIFs and dodecahedral ZIFs, respectively The experiment revealed that all three adsorbents exhibited excellent adsorption capacities of As(III) despite distinct specific surface area and morphology. The adsorption isotherms of cubic ZIFs, leaf-shaped ZIFs and dodecahedral ZIFs were generally fitted by Langmuir model and the maximum adsorption capacities were 122.6, 108.1, 117.5mg/g, respectively at pH 8.5. At initial concentration of 200?g/L, As(III) was rapidly decreased to below 10?g/L by the three ZIFs in 2h at a adsorbent dosage of 0.2g/L. It was found that zinc hydroxyl substitution was the main surface complexation method for As(III) adsorption onto the three ZIFs evidenced by the FTIR and XPS results.
KW - Zeolitic imidazolate frameworks
KW - Sorption
KW - Arsenite
KW - Mechanism
UR - http://goo.gl/IrCM8E
U2 - 10.1016/j.colsurfa.2015.06.009
DO - 10.1016/j.colsurfa.2015.06.009
M3 - Article
VL - 481
SP - 358
EP - 366
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
SN - 0927-7757
ER -