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Surfactant-Modified Clay Sorbents for the Removal of p-nitrophenol

Published online by Cambridge University Press:  01 January 2024

Ruta Ozola*
Affiliation:
Department of Environmental Science, University of Latvia, Raina Blvd 19, LV-1586, Riga, Latvia
Andrejs Krauklis
Affiliation:
Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway
Juris Burlakovs
Affiliation:
Department of Environmental Science, University of Latvia, Raina Blvd 19, LV-1586, Riga, Latvia Department of Biology and Environmental Science, Linnaeus University, 39182, Kalmar, Sweden
Maris Klavins
Affiliation:
Department of Environmental Science, University of Latvia, Raina Blvd 19, LV-1586, Riga, Latvia
Zane Vincevica-Gaile
Affiliation:
Department of Environmental Science, University of Latvia, Raina Blvd 19, LV-1586, Riga, Latvia
William Hogland
Affiliation:
Department of Biology and Environmental Science, Linnaeus University, 39182, Kalmar, Sweden
*
*E-mail address of corresponding author: ruta.ozola@lu.lv

Abstract

Organic pollutants are widespread and a known problem for the environment. p-nitrophenol (PNP) is one such pollutant found in effluents from various industries involved with pesticides, pharmaceuticals, petrochemicals, plastic, paper, and other materials. The objective of this research was to prepare and test organically modified clays using four different surfactants and to evaluate the removal efficiency of PNP from aqueous solutions. Organically modified clays have attracted great interest due to their wide applications in industry and environmental protection as sorbents for organic pollutants. Two natural smectite-dominated clay types from outcrops in Latvia and Lithuania as well as industrially manufactured montmorillonite (Mt) clay were modified using different nonionic (4-methylmorpholine N-oxide (NMO) and dimethyldodecylamine N-oxide (DDAO)) and cationic (benzyltrimethyl ammonium chloride (BTMAC) and dodecyltrimethyl ammonium chloride (DTAC)) surfactants. Modified clay materials were characterized by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and the Brunauer-Emmett-Teller method (BET) for surface area analysis. Sorption of PNP was investigated under various conditions, e.g. surfactant loading, initial PNP concentration, contact time, and pH. The novelty of the present study was to prepare innovative organo-sorbents based on manufactured as well as natural clay samples using cationic surfactants and nonconventional nonionic surfactants as modifiers. The sorption data combined with FTIR and XRD supplementary results suggests that nonionic organo-clay (Mt-DDAO_2) is the most effective sorbent and may serve as a low-toxicity immobilizer of pollutants such as phenols.

Type
Article
Copyright
Copyright © Clay Minerals Society 2019

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