Removal of triclosan by CTAB-modified zeolite-rich tuff from aqueous solutions

Abstract

Triclosan (TCS) adsorption behavior by a modified zeolite with Cetyl Trimethyl Ammonium Bromide (CTAB) was evaluated factoring in pH, contact time, and TCS initial concentration in a batch system. Natural clinoptilolite-type zeolite from Sonora, Mexico was conditioned with a sodium chloride solution, and, subsequently, modified with CTAB. All the zeolites were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Electron Dispersive Spectroscopy (EDS), and the Zero Point Charge (pHZPC). It was found that the morphological and structural properties of natural zeolite were not affected after treatment with cationic surfactant. Furthermore, adsorption process efficiency was enhanced by the presence of CTAB, obtaining TCS maximum adsorption capacity at an optimal pH of 9.0. In this context, the positively charged surface of the modified zeolite and the anionic triclosan species present were decisive. Kinetics data were well adjusted to a pseudo-second order model with a TCS adsorption capacity of 1.430 ± 0.051 mg g-1 at an equilibrium time of 18 h. Isotherm results were best adjusted to the Langmuir model with a qmax = 2.027 mg g-1 using an initial Co concentration of 18.0 mg L-1, and reaching an equilibrium Ce concentration of 0.559 mg L-1. The mechanism for the adsorption of TCS by CTAB-modified zeolite was proposed to be electrostatic attractions between the group of partial positive charge of CTAB and the anionic species of triclosan. Consequently, CTAB-modified zeolites could be used as effective adsorbents for triclosan removal.

Preparation and application of a surfactant‐modified Halloysite nanotubes for the adsorption of nitrates from aqueous solutions: Kinetic and equilibrium studies

“…It is evident from the XRD and SEM analyses that neither morphology nor crystal structure of HNTs has been damaged by CTAB modification. The results are consistent with the previous reports 47,56,58–60 . As SEM images were not adequate to confirm surfactant molecules modification on HNTs surfaces, it is necessary to use TEM results as an evidence of the above conclusion.…”

“…The results are consistent with the previous reports. 47,56,[58][59][60] As SEM images were not adequate to confirm surfactant molecules modification on HNTs surfaces, it is necessary to use TEM results as an evidence of the above conclusion.…”

Density functional theory study of hydrophobic zeolites for the removal of triclosan from aqueous solution

“…In addition to these investigations of synthetic zeolites, TCS adsorption experiments were also performed on natural zeolites (clinoptilolites) modified with organic surfactants, which could be cheaper to produce. 33,34 It is, however, worth noting that maximal TCS loadings and affinities towards TCS reported in those works were considerably lower than for the best-performing high-silica zeolites studied by Jiang et al 32…”

Preparation of a Gangue-Based X-type Zeolite Molecular Sieve as a Multiphase Fenton Catalyst and Its Catalytic Performance

“…The S BET of the CX-1.0 sample was 381.5 m 2 /g, and the pore volume was 0.28 cm 3 /g. The hysteresis loop is a mesopore between aggregated zeolite crystals . Replacing two Na + cations by one Cu 2+ cation should lead to more open pores.…”