Carbon disulfide-modified turmeric powder-incorporated silica gel for removal of Hg2+ in aqueous media
Document Type
Article
Publication Date
6-1-2024
Abstract
The application of turmeric powder as a natural product-based material for removing Hg2+ from water was demonstrated. In this study, carbon disulfide-modified turmeric (MT) was synthesized and incorporated into silica gel to create a selective sorbent (SiO2-MT). Infrared spectroscopy and energy-dispersive X-ray spectroscopy confirmed that MT was successfully incorporated into the silica gel matrix. Morphological studies revealed that SiO2-MT was porous with a pore size of 1.87 nm. SiO2-MT exhibited selectivity for the adsorption of Hg2+. The overall performance of SiO2-MT in adsorbing Hg2+ significantly improved with increasing SiO2-MT dosage, ranging from 5 to 20 mg. After reaching a dosage of 20 mg of SiO2-MT, no further significant improvement was observed. The optimal pH for Hg2+ removal ranged from four to five, with approximately 90% Hg2+ removal, and the adsorption process reached equilibrium at 180 min. The adsorption data were well-fitted to the Langmuir isotherm and pseudo-second-order kinetics models, indicating that SiO2-MT adsorbed Hg2+ through monolayer adsorption and chemisorption. The maximum adsorption capacity of the synthesized SiO2-MT was 37.6 mg g(-1), which is higher than that of other reported biomasses, including bamboo leaves and garlic powder. In conclusion, this study demonstrates the potential use of turmeric powder, a natural product, for effective Hg2+ removal during water treatment.
Keywords
Natural products, Water treatment, Heavy metals removal, Kinetics and mechanism, Sol-gel, Mercury(ii) ion
Divisions
CHEMISTRY
Funders
Universiti Malaya (PG049-2016A); (GPF049B-2018),Universiti Malaya (IPPP),Ministry of Education, Malaysia
Publication Title
International Journal of Environmental Science and Technology
Volume
21
Issue
10
Publisher
Springer
Publisher Location
ONE NEW YORK PLAZA, SUITE 4600, NEW YORK, NY, UNITED STATES