TY - JOUR
T1 - Metal-Organic Framework-74 for Ultratrace Arsenic Removal from Water
T2 - Experimental and Density Functional Theory Studies
AU - Abu Tarboush, Belal J.
AU - Chouman, Ali
AU - Jonderian, Antranik
AU - Ahmad, Mohammad
AU - Hmadeh, Mohamad
AU - Al-Ghoul, Mazen
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/7/27
Y1 - 2018/7/27
N2 - This study investigates and compares arsenic, As(V), removal from aqueous media using the water-stable zinc metal-organic frameworks (Zn-MOF-74) prepared via room-temperature precipitation (RT-Zn-MOF-74) and a solvothermal procedure (HT-Zn-MOF-74). The Zn-MOF-74 crystals possess average particle sizes of 66 nm and 144 μm for RT-Zn-MOF-74 and HT-Zn-MOF-74, respectively. Moreover, nanosized RT-Zn-MOF-74 exhibited a superior performance to HT-Zn-MOF-74. While the Brunauer-Emmett-Teller surface area of RT-Zn-MOF-74 was smaller than that of HT-Zn-MOF-74, higher adsorption uptake took place on the room-temperature-synthesized ones because of their small particle size and better dispersion. Adsorption isotherm studies showed that the Langmuir isotherm was effective for the adsorption of As(V) onto RT-Zn-MOF-74 and HT-Zn-MOF-74 with maximum adsorption uptake (qmax) values of 99.0 and 48.7 mg g-1, respectively. These values exceed most reported maximum adsorption capacities at neutral pH. The thermodynamics of adsorption revealed a spontaneous endothermic process that is due to the substitution of adsorbed water molecules by arsenate in the pores of the MOF crystal. This was further investigated using plane-wave density functional theory calculations. This study constitutes direct evidence for the importance of tuning the size of the MOF crystals to enhance their properties.
AB - This study investigates and compares arsenic, As(V), removal from aqueous media using the water-stable zinc metal-organic frameworks (Zn-MOF-74) prepared via room-temperature precipitation (RT-Zn-MOF-74) and a solvothermal procedure (HT-Zn-MOF-74). The Zn-MOF-74 crystals possess average particle sizes of 66 nm and 144 μm for RT-Zn-MOF-74 and HT-Zn-MOF-74, respectively. Moreover, nanosized RT-Zn-MOF-74 exhibited a superior performance to HT-Zn-MOF-74. While the Brunauer-Emmett-Teller surface area of RT-Zn-MOF-74 was smaller than that of HT-Zn-MOF-74, higher adsorption uptake took place on the room-temperature-synthesized ones because of their small particle size and better dispersion. Adsorption isotherm studies showed that the Langmuir isotherm was effective for the adsorption of As(V) onto RT-Zn-MOF-74 and HT-Zn-MOF-74 with maximum adsorption uptake (qmax) values of 99.0 and 48.7 mg g-1, respectively. These values exceed most reported maximum adsorption capacities at neutral pH. The thermodynamics of adsorption revealed a spontaneous endothermic process that is due to the substitution of adsorbed water molecules by arsenate in the pores of the MOF crystal. This was further investigated using plane-wave density functional theory calculations. This study constitutes direct evidence for the importance of tuning the size of the MOF crystals to enhance their properties.
KW - adsorption
KW - arsenic removal
KW - metal-organic frameworks
KW - nanomaterial
KW - water treatment
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U2 - 10.1021/acsanm.8b00501
DO - 10.1021/acsanm.8b00501
M3 - Article
AN - SCOPUS:85070949546
SN - 2574-0970
VL - 1
SP - 3283
EP - 3292
JO - ACS Applied Nano Materials
JF - ACS Applied Nano Materials
IS - 7
ER -