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- Title
Synthesis of Cu/Zn doped zeolite hybrids for batch remediation of toxic environmental pollutants.
- Authors
Tabassum, Noshabah; Rafique, Uzaira
- Abstract
The industrial revolution has led to an unequal and uncontrolled distribution of the toxic substances in different environmental compartments. A large number of researchers have offered specific solution to combat the hazardous and toxic substances. The real challenge faced today is the complex interaction of the pollutants in each compartment compelling the scientists to develop materials offering one spot solution applicable to a wide range of toxicants. In the present research, zeolite as base material is synthesized from economical precursors using hydrothermal method. Post modification for synthesis of functionalized hybrids is attempted with doping of metals (Cu, Zn). The purpose of preparation of hybrids is to have diverse functional groups on the surface of a single zeolite to adsorb a variety of pollutants from environmental media. The synthesized materials are subjected to a series of characterization techniques [Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy/ Energy-dispersive X-ray (SEM/EDX)] to determine surface and bulk properties for effective adsorption. The successful incorporation of metal-oxygen is indicated by FTIR. SEM analysis proposes that crevices and channels serve as pores for uptake of incoming pollutants. Further, EDX shows silica and alumina percentage which is involved in developing zeolite framework (internal and external linkages) for binding. The thermal stability of zeolite (360°C–570°C) is assessed from TGA studies. XRD demonstrates the amorphous nature of zeolite framework that generally decreases on functionalization. Zeolite and the functionalized hybrids are applied for the removal of metals (Hg, As), dyes (Methylene blue, Methyl orange). Generally, mercury showed better removal than arsenic on the adsorbents. Moreover all zeolite based hybrids testifies the fitness of pseudo-second-order kinetics and Langmuir and Freundlich isotherms for the removal of mercury and arsenic.
- Subjects
POLLUTANTS; ENVIRONMENTAL remediation; ARSENIC removal (Water purification); HAZARDOUS substances; POISONS; ZEOLITES
- Publication
Desalination & Water Treatment, 2021, Vol 236, p250
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2021.27697