Sodium Dodecyl Sulfate Modified-Zeolite as a Promising Adsorbent for the Removal of Natural Organic Matter From Aqueous Environments

Abstract

Background: High concentrations of natural organic matter (NOM) may cause the production of harmful compounds in treated drinking water. Surfactant-modified zeolites (SMZs) with various loadings of sodium dodecyl sulfate (SDS) have been used as adsorbents to remove NOM from aqueous solution. SMZ has presented higher NOM adsorption more efficiency than natural zeolite. NOM affects the quality of drinking water in several points. Objectives: The purpose this study was to investigate the SDS-modified isotherm of natural Iranian zeolite obtained from Semnan mines, for the removal of NOM from aqueous solution. Materials and Methods: The adsorption of NOM onto SDS-modified zeolite as a function of contact time, initial NOM concentrations, adsorbent dose and solution pH was investigated. The isotherm experiments were carried out with fixing the adsorbent dose and varying the initial concentration of NOM. Results: The results indicated that SDS-modified zeolite showed greatly enhanced adsorption capacity. Findings revealed that the Langmuir isotherm best described the NOM adsorption on the adsorbent. The adsorption isotherm was well fitted to the Langmuir model. The maximum adsorption capacity of SMZ with surfactant bilayer coverage for NOM was 111 mg/g at 25°C and pH = 5. Conclusions: The findings of this study showed that the modification of natural zeolites can achieve higher adsorption capacity for organics. In addition, based on the results, natural zeolite being modified with SDS as a cationic surfactant had good efficiency for the adsorption of NOM.

Preparation of magnetite-silica–cetyltrimethylammonium for phenol removal based on adsolubilization

“…The solid was washed with distilled water repeatedly until no Br − ions were detected with no deposits forming in the filtrate by dropping AgNO 3 . Magnetite-silica-cetyltrimethylammonium (MS-CTA) was then dried at 50°C for 24 h in an oven [17]. Magnetite-silica with the addition of 1, 5, and 10 mmol L −1 CTAB solution was represented as MSA 1 , MSA 2 , and MSA 3 .…”

Removal of Lead Ions from Aqueous Solution by Nano Zero-Valent Iron (nZVI)

“…Bazrafshan et al, (2014) reported that the equilibrium assessment reveals that the Langmuir model is better than Freundlich model for removal of methyl orange and reactive red 198 dyes by Moringa peregrine ash (28). Mahvi et al, (2016) showed that the natural organic matter from aqueous environments removed by sodium dodecyl sulfate modified zeolite and the adsorption isotherm was well fitted to the Langmuir model (29). Many studies showed that increasing initial time caused an increase of Lead removal with G-nZVI and nZVI.…”

Fabrication and characterization of polymer-based nanocomposite membrane modified by magnetite nanoparticles for Cd 2+ and Pb 2+ removal from aqueous solutions

“…The dimensionless separation factor R L was determined to be between 0 and 1 for both metal ion concentrations in the range of 5-50 mg•g −1 , indicating that the adsorption process by the fabricated NCM is favorable [58]. Moreover, n values greater than 1 from the Freundlich isotherm studies suggest favorable adsorption conditions [59]. Nevertheless, the values of the correlation coefficients showed that the removal process of both Cd 2+ and Pb 2+ ions from the aqueous solution can be the best fit to the Langmuir isotherm model.…”