Graphene oxide and thiol functionalized natural zeolite for the removal of lead from water | Zendy

Mohsen Manjili | Zendy; Marcia R. Silva | Zendy; David Garman | Zendy; Haifeng Zhang | Zendy

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Graphene oxide and thiol functionalized natural zeolite for the removal of lead from water

Author(s) -

Mohsen Manjili,

Marcia R. Silva,

David Garman,

Haifeng Zhang

Publication year - 2020

Publication title -

water science and technology water supply

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.318

H-Index - 39

eISSN - 1607-0798

pISSN - 1606-9749

DOI - 10.2166/ws.2020.156

Subject(s) - zeolite , adsorption , thermogravimetric analysis , graphene , fourier transform infrared spectroscopy , oxide , clinoptilolite , chemical engineering , sorption , materials science , scanning electron microscope , inorganic chemistry , chemistry , nuclear chemistry , organic chemistry , nanotechnology , catalysis , composite material , metallurgy , engineering

Materials with potentially enhanced adsorption properties were developed by functionalizing natural clean clinoptilolite zeolite (CZ) to fabricate graphene oxide coated zeolite (GOZ) and cystamine dihydrochloride zeolite (CDHZ). The functionalized materials were characterized with Fourier transform infrared spectroscopy (FTIR), Raman, thermogravimetric analysis (TGA), and a scanning electron microscope (SEM) equipped with X-ray spectroscopy (EDS) techniques. The solution pH effect on removal efficiency was investigated at acidic, neutral, and basic pH levels. All adsorbent materials showed the highest adsorption capacities at neutral pH. Experiments were used to assess efficacy for the removal of lead with the sorption kinetics and the adsorption isotherms being determined for the baseline material CZ and treated zeolites. The addition of graphene oxide and thiol functional groups increased the lead removal capacity of natural clean zeolite by 16.81% and 34.53%, respectively. Diffusion studies revealed that the overall lead adsorption process is a particle diffusion process. Theoretical calculations confirmed the pseudo-second-order model as the kinetic mechanism for lead adsorption for CZ, GOZ and CDHZ.

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