Products Cited in Publications Worldwide Carbamazepine adsorption with a series of organoclays: removal and toxicity analyses

Carbamazepine adsorption with a series of organoclays: removal and toxicity analyses

Rayanne M. A. Viegas; Marlon L. Melo; Luciano C. Brandão Lima; Ramón R. P. Garcia; Edson C. Silva Filho; Josy A. Osajima; Osvaldo Chiavone‑Filho

DOI:

Abstract

Organoclays have been used as efficient adsorbents for pharmaceutical pollutants present in waters. (CBZ) is one of the drugs most frequently found in water bodies. In this study, four organoclays were prepared by modifying bentonite with the cationic (HDTMA) and . The synthesized materials were characterized by XRD, CHN, FTIR, TG, BET and SEM analyses, confirming organophilization. The were interspersed in different arrangements in the interlayer space. sorption was investigated through batch equilibrium experiments, under variation of the pH, contact time, dosage of adsorbent, and initial drug concentration. Changes in pH showed no adsorption influence. sorption by the organoclays followed a pseudo-second-order kinetics. The best sorption performance was obtained for the BCN1-HDTMA100 clay, with a capacity of 34.34 ± 1.41 mg g−1, about ten times greater than the unmodified bentonite under the same conditions. This may be attributed to the higher surfactant content. The adsorption isotherm at 25 ºC showed linear behavior. Toxicity tests of the organoclays and corresponding medium in presence of were carried out. This is a novelty report. Most of the organoclays had no toxicity against Artemia salina. The toxicity of the medium after adsorptive treatment was eliminated. Organoclay-CBZ hybrids were also characterized after adsorption. FTIR and TG analyzes confirmed the incorporation of the drug. Hydrophobic interaction was the dominant contribution evaluated to the adsorption of . The results demonstrated that organoclays can be a promising alternative adsorbent for the removal of pharmaceutical pollutants in water remediation.

Keywords

Emerging contaminants ; Pharmaceutical pollutants ; Water treatment ; Modifed bentonite ; Cationic surfactant

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Trimethyloctadecylammonium bromide

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Trimethyloctadecylammonium bromide

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