Synergistic effect of surfactant hexadecyltrimethylammonium supporting and hydrous titania impregnation onto zeolite in enhanced removal of anionic X‐3B dye from aqueous solution

Abstract

A new modified zeolite (HTiZFA) was achieved by dually supporting hexadecyltrimethylammonium (HDTMA) and hydrous titania onto synthetic zeolite from coal fly ash via coating HDTMA and Ti(SO4)2 solution respectively, which has an increased adsorption activity for anion X‐3B dye from aqueous solution. HTiZFA with the optimum removal efficiency was obtained at the coating concentration of 13 mmol/L HDTMA, 20.8 mmol/L Ti(SO4)2, and 2 g/L dosage of zeolite. X‐ray fluorescence, X‐ray diffraction (XRD), scanning electron microscope‐energy dispersive, Fourier transform infrared, Brunauer Emmett Teller (BET), and zeta potential analysis are used to characterize the samples (HTiZFA). In XRD spectrum, no typical peak representing anatase TiO2 crystal suggested that hydrous titania which was impregnated on HTiZFA existed as an amorphous phase. The specific surface area of HTiZFA (32.73–37.71 m2/g) did not alter a lot compared with that of ZFA, but the surface charge of HTiZFA (pH = 8.55) shifted to positive greatly, which caused a considerable enhancement in X‐3B adsorption. It was found that X‐3B sorption on HTiZFA was almost independent on initial pH because the removal rate maintained above 96% in a wide pH range of 3.0–11.0. An increasing qe with an upward temperature confirmed versatile attractive interactions and endothermic sorption nature, and a good ability was observed after several adsorption/desorption circulations. HTiZFA is expected to be a multifunctional adsorbent for treating higher concentration anionic pollutants that cannot be removed by commonly modified products efficiently.

Round-the-Clock Adsorption–Degradation of Tetracycline Hydrochloride by Ag/Ni-TiO2

“…TiO 2 was prepared using a hydrothermal method according to the literature [ 27 , 28 ]. Initially, 0.01 mol titanium sulfate (Sinopharm Chemical Reagent Co., Shanghai, China) was added to 60 mL of deionized water and stirred for 20 min.…”

Kinetic effects of cationic surfactants on the photocatalytic degradation of anionic dyes in aqueous TiO2 dispersions

“…20,21 The role of surfactants as mediator of the interaction of dye and semiconductor in favoring the electron injection from the dye to the photogenerated positive hole proved crucial for the oxidative degradation process. [22][23][24][25] In the present article, we attempted to determine the feasibility of total degradation by UV/TiO2 in the presence of cationic surfactants of two dyes, both anionic at working pH, such as monoazo dye Orange G (OG) and Eosin Y (EY), a brominated derivative of fluorescein belonging to the xanthene group (Scheme 2). These particular dyes, widely used for dyeing in the textile industry, were selected because the variety of functional groups in their structure.…”

“…20,21 The role of surfactants as a mediator of the interaction of dye and semiconductor in favoring the electron injection from the dye to the photogenerated positive hole proved crucial for the oxidative degradation process. 22–25…”