Abstract
Nanocomposite materials containing graphene oxide have attracted tremendous interest as catalysts and adsorbents for water purification. In this study, mesoporous titanosilicate/reduced graphene oxide composite materials with different Ti contents were employed as adsorbents for removing bisphenol A (BPA) from water systems. The adsorptive interaction between BPA and adsorption sites on the composite materials was investigated by Fourier transform infrared (FT-IR) and Raman spectroscopy. Adsorption capacities of BPA at equilibrium, q e (mg/g), decreased with increasing Ti contents, proportional to the surface area of the composite materials. FT-IR observations for fresh and spent adsorbents indicated that BPA adsorbed onto the composite materials by the electrostatic interaction between OH functional groups contained in BPA and on the adsorbents. The electrostatic adsorption sites on the adsorbents were categorized into three hydroxyl groups: Si-OH, Ti-OH, and graphene-OH. In Raman spectra, the intensity ratios of D to G band were decreased after the adsorption of BPA, implying adsorptive interaction of benzene rings of BPA with the sp2 hybrid structure of the reduced graphene oxide.
Highlights
Endocrine-disrupting chemicals (EDCs) are substances that mimic natural hormones in the endocrine system causing adverse effects on humans and wildlife [1,2]
EDCs are considered to be exogenous agents that interfere with the synthesis, secretion, transport, binding, action, and elimination of natural hormones in the body responsible for the maintenance of homeostasis, reproduction, development, and behavior
Bisphenol A (BPA), an EDC, is a cause of considerable social and scientific concern. It is heavily used as a monomer in the synthesis of epoxy resins and polycarbonate plastics [3] and is considered to be a significant pollutant since its weak estrogen-like effect is harmful to organisms [3,4,5]
Summary
Endocrine-disrupting chemicals (EDCs) are substances that mimic natural hormones in the endocrine system causing adverse effects on humans and wildlife [1,2]. EDCs are considered to be exogenous agents that interfere with the synthesis, secretion, transport, binding, action, and elimination of natural hormones in the body responsible for the maintenance of homeostasis, reproduction, development, and behavior. Bisphenol A (BPA), an EDC, is a cause of considerable social and scientific concern. It is heavily used as a monomer in the synthesis of epoxy resins and polycarbonate plastics [3] and is considered to be a significant pollutant since its weak estrogen-like effect is harmful to organisms [3,4,5].
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