Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 125, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physe.2020.114377
Keywords
Arsenic adsorption; Metal-organic framework; Reduced graphene oxide; Polyacrylamide
Funding
- Social Development Fund of Guangdong Province [2017A020216018]
- Guangzhou Science and Technology Project [201904010319]
- Chongqing Science and Technology Commission of China [cstc2019jcyj-msxmX0647]
- Science and Technology Research Program of Chongqing Municipal Education Commission China [KJQN201801324]
- Foundation for High-level Talents of Chongqing University of Arts and Sciences, China [R2018CH11]
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A novel zinc based metal-organic framework and polyacrylamide coated on reduced graphene oxide was developed as an effective adsorbent for the removal of arsenite from water, showing rapid removal efficiency and high stability. The adsorption mechanism involves a synergistic combination of chemisorption and physisorption, with the amide and hydroxyl groups dominating in the adsorption process.
Contamination of drinking water with heavy metals, particularly arsenic (As), is a persistent problem with serious public health implications worldwide. In this study, we present a zinc based metal-organic framework (Zn-MOF-74) and polyacrylamide polymer (PAM) coated on reduced graphene oxide (rGO) as an effective adsorbent for the removal of arsenite (As(III)) from water. Zn-MOF-74 nanoparticles were prepared by room temperature precipitation and these were immobilized on rGO surface grafted PAM by a free-radical polymerization method, (Zn-MOF-74/rGO/PAM nanocomposites). The experimental data correlates well with the pseudo-second-order kinetic model and Langmuir isotherm, and the maximum adsorption capacity (q(max)) was 282.4 mg g(-1) at pH 10, 298 K. The removal efficiency was rapid, removing more than 99.8% of As(III) from a 0.2 mg L-1 solution and achieving drinkable levels in 15 min. Thermodynamic data revealed that the process was spontaneous and endothermic. Furthermore, the adsorbent revealed high stability in pH range 4-10 and could be reused at least four times. Adsorption mechanism involved a synergistic combination of chemisorption and physisorption. FTIR and XPS analyzes revealed that the amide group (-NH2) and hydroxyl group (-OH) on ZnMOF-74/rGO/PAM dominate in their adsorption.
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