Rational synthesis and characterization of highly water stable MOF@GO composite for efficient removal of mercury (Hg2+) from water
Ahmed M. Fallatah,
Habib Ur Rehman Shah,
Khalil Ahmad,
Muhammad Ashfaq,
Abdul Rauf,
Muhammad Muneer,
Mohamed M. Ibrahim,
Zeinhom M. El-Bahy,
Amir Shahzad,
Afshain Babras
Affiliations
Ahmed M. Fallatah
Department of Chemistry, College of Science, Taif University, PO Box 11099, Taif 21944, Saudi Arabia
Habib Ur Rehman Shah
Institute of Chemistry, Baghdad Ul Jadeed Campus, The Islamia University of Bahawapur-63100, Punjab, Pakistan; Roy & Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, United States; Corresponding author.
Khalil Ahmad
Institute of Chemistry, Baghdad Ul Jadeed Campus, The Islamia University of Bahawapur-63100, Punjab, Pakistan; Department of Chemistry, University of Management and Technology Sialkot Campus Sialkot, Punjab, Pakistan; Corresponding author.
Muhammad Ashfaq
Institute of Chemistry, Baghdad Ul Jadeed Campus, The Islamia University of Bahawapur-63100, Punjab, Pakistan; Corresponding author.
Abdul Rauf
Institute of Chemistry, Baghdad Ul Jadeed Campus, The Islamia University of Bahawapur-63100, Punjab, Pakistan
Muhammad Muneer
Department of Chemistry, Khwaja Fareed University of Engineering and Information Technology Rahimyarkhan-64200, Punjab, Pakistan
Mohamed M. Ibrahim
Department of Chemistry, College of Science, Taif University, PO Box 11099, Taif 21944, Saudi Arabia
Zeinhom M. El-Bahy
Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt
Amir Shahzad
Institute of Chemistry, Baghdad Ul Jadeed Campus, The Islamia University of Bahawapur-63100, Punjab, Pakistan
Afshain Babras
Institute of Chemistry, Baghdad Ul Jadeed Campus, The Islamia University of Bahawapur-63100, Punjab, Pakistan
The present study is aimed at adsorptive removal of Mercury (Hg2+) using highly functionalized nanomaterials based on Graphene Oxide Zeolitic Imidazolate Framework composite (ZIF-67@GO). Solvothermal methodology was used to synthesize ZIF-67@GO composite. Synthesized compounds were confirmed by FTIR, SEM, PXRD and EDX analysis. The as-prepared ZIF-67@GO was tested as efficient adsorbent for effective removal of Mercury (Hg2+) from aquatic environment. The atomic adsorption spectrophotometer was used to monitor the process of adsorption of Hg+2 on ZIF-67@GO. From the adsorption data, the maximum removal efficiency achieved was 91.1% using 10 mg amount of composite for 50 mL using 20 ppm Mercury (Hg2+) solution. Different parameters like pH, contact time, concentration, adsorption kinetics and isotherm were also examined to explore adsorption process. Adsorption data fitted well for Freundlich Model having R2 value of 0.9925 than Langmuir Isotherm with R2 value of 0.9238. Kinetics were rapid and excellently described via 2nd order model with R2 = 0.99946 than 1st order model with R2 value of 0.8836. Freundlich and pseudo 2nd order models validated that multilayer chemisorption occurs during adsorption process due to the presence of highly functionalized sites on ZIF-67@GO composite. The synthesized composite material has shown excellent reusability. Thus, water stable ZIF-67@GO composites can efficiently be used for Mercury (Hg2+) confiscation from water.
