Abstract
The cationic surfactants have various applications being found in personal care products, detergents, cleaning products, disinfectants, hair conditioners, etc. Cationic surfactants are presented in domestic or industrial wastewater, being very resistant pollutants to biodegradation during conventional wastewater treatment (WT) methods, which generated the need to develop new efficient alternative methods. One of the alternative to conventional WT methods involves the utilization of the adsorbent nanomaterials, which are highly efficient, easy to operate, environmental friendly and cost effective. In this study, it was investigated the adsorption process of a cationic surfactant, benzyldodecyldimethylammonium bromide (benzalkonium bromide) from wastewater on magnetite nanomaterial. The adsorption investigation of benzalkonium bromide was analyzed by TOC analysis and the maximum adsorption efficiency obtained was 91.4 %. The experimental data fitted very well with Langmuir model, the correlation coefficient (R2) being 0.9792.
Highlights
Surfactants are the most used organic substances in many household and industrial products
The methods used for analysis of benzalkonium bromide in disinfectants products are based on capillary electrophoresis (CE) and high-performance liquid chromatography (HPLC) with UV detector [12]
benzyldodecyldimethylammonium bromide (BB) kinetic studies The variation of different BB concentrations absorbed in presence of magnetite nanomaterial adsorbent in time showed a rapid decrease up to 2 h, no significant variations were observed (Figure 1)
Summary
Surfactants are the most used organic substances in many household and industrial products. The cationic surfactants have negative influences on the environment by increasing the eutrophication of lakes [7,8] or by disturbing the wastewater treatment process through the decreasing of microbial communities and subsequently disturbing the biochemical reactions of the activated sludge [9,10]. Benzyldodecyldimethylammonium bromide, the chemical name of benzalkonium bromide is a cationic surfactant used as biocide in cosmetic products (hair conditioners and hair coloring preparations), detergent products, pesticide or as an inactive ingredient in pharmaceuticals. It was introduced on the market in 1953 and it has been widely used in chemical disinfectants due to its low price. HPLC, combined with various detectors, is used for the analysis of surfactants and their degradation products [13]
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