The toxicity of cationic surfactant HDTMA-Br, desorbed from surfactant modified zeolite, towards faecal indicator and environmental microorganisms

Reeve, Peter J.; Fallowfield, Howard

doi:10.1016/j.jhazmat.2017.06.022

Cited by 29 publications

(11 citation statements)

References 24 publications

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“…For the purpose of this study, the authors chose two surface active agents: hexadecyltrimethylammonium bromide (HDTMA-Br) and benzyldimethylhexadecylammonium chloride (HDBA-Cl). HDTMA-Br is most commonly used [28,29], and the HDTMA molecule consists of 16 carbon atoms and constitutes the chain where hydrophilic head is attached. Organo-vermiculite modified with HDTMA has been proved to be an effective sorbent for organic compounds and anions [30,31].…”

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confidence: 99%

Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

et al. 2019

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Among the various technologies tested for removing the anionic species resulting from arsenic contamination, sorption methods have received unflagging interest. Being potential sorbent materials, clay minerals modified by cationic surfactants are often examined for this purpose. Among the clay minerals tested, information regarding sorption properties of expanded vermiculite modified with surfactants is scarce. Therefore, the present study aims to prepare organo-vermiculites modified with hexadecyltrimethylammonium (HDTMA) and benzyldimethylhexadecylammonium (HDBA) at surfactant concentrations of 0.5, 1.0, and 2.0 cation exchange capacity. Modified sorbents were identified and characterized using the analytical methods that can determine phase composition and textural properties of the samples. The sorption of As(III) and As(V) as a function of initial pH value, initial concentration of As(III, V), and initial dosage of sorbent was investigated. The results show that HDTMA and HDBA affect the properties of raw vermiculite. For instance, increase in the concentration of surfactants is often accompanied by a change in interlayer space or textural properties of vermiculite. It was observed that tested organo-minerals adsorbed As(V) to a greater extent compared to As(III). Various analytical studies were carried out and the results revealed the successful synthesis of organo-vermiculite. Moreover, the study also showed that the structure of organo-vermiculite has a significant impact on the uptake of As(III) and As(V) anions.In the last decades, various technologies for removing As from contaminated water have been investigated, such as oxidation, coagulation, ion exchange, precipitation, membrane filtration, biological treatment, and sorption [9][10][11]. However, most of these methods have drawbacks, including high costs, deficient removal, generation of waste products, or high reagent and energy requirement. Among the methods mentioned earlier, adsorption seems to be the most effective method [1,12]. For removal by adsorption technique, activated carbon, metal-organic frameworks, zeolites, bog iron ores, water treatment residuals, and activated alumina have been proven to be promising adsorbents for arsenic removal [13][14][15][16][17].Clay minerals are low-cost and nontoxic sorbents. Raw clays are able to sorb cations owing to their negatively charged surface; however, they display low sorption efficiency for negatively charged contaminants such as arsenic [18]. Nevertheless, clays can be chemically modified by organic surfactants, which change the charge on the clay surface from negative to positive [19]. The organo-clays are hydrophobic materials that can effectively sorb anions and organic compounds. Modified kaolinite, montmorillonite, and illite are the most popular clay minerals that are used as sorbents [20][21][22]. However, only a few studies have focused on using organo-vermiculites to sorb anions [23,24].Vermiculite is a 2:1 phyllosilicate mineral having a sandwiched structure with two tetrahedral shee...

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confidence: 99%

Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

et al. 2019

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“…Arquad ® or related surfactants comprised quaternary ammonium compounds, containing nitrogen cations (N + ) supported by four species of alkyl or aryl groups; they are the primary concern for toxicity to soil native microorganism (Li and Brownawell, ). Conceivably, these functional groups could exert toxicological impact on soil microorganisms (Reeve and Fallowfield, ) and inhibit biodegradation of hydrocarbon compounds (Ugochukwu et al , ). However, the modified form of that organoclay (ABP) provided a congenial microhabitat for soil microorganism potentially through (i) anchoring of the exposed sites of the cationic surfactant through non‐toxic fatty acid molecules and (ii) creating a more hydrophobic clay mineral surface to facilitate solid surface‐supported microbial biofilms (Singh et al , ; Leglize et al , ).…”

Section: Discussionmentioning

confidence: 99%

Modified clays alter diversity and respiration profile of microorganisms in long‐term hydrocarbon and metal co‐contaminated soil

Biswas

Juhasz

Rahman

et al. 2019

Microbial Biotechnology

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Summary Clays and surfactant‐modified clays (organoclays) are becoming popular as pollutant sorbents due to their high reactivity and low‐cost availability. However, the lack of field testing and data on ecotoxicity limits their application. Considering such aspects, this study assessed the impact of clay amendments to polycyclic aromatic hydrocarbons (PAHs)/cadmium (Cd)‐contaminated soil on microbial respiration profiles (active vs. inactive cells) using redox staining and the relative abundance and diversity of bacteria and archaea. These clay products are bentonite, cationic surfactant‐modified bentonite and palmitic acid‐grafted surfactant‐modified bentonite). After 70 days, the addition of bentonite and its modified forms altered microbial community structure mainly among dominant groups (Actinobacteria, Proteobacteria, Firmicutes and Chloroflexi) with effects varying depending on material loading to soil. Among amendments, fatty acid (palmitic acid) tailored cationic surfactant‐modified bentonite proved to be microbial growth supportive and significantly increased the number of respiration‐active microbial cells by 5% at a low dose of material (e.g. 1%). Even at high dose (5%), the similarity index using operational taxonomic units (OTUs) also indicates that this modified organoclay‐mixed soil provided only slightly different environment than control soil, and therefore, it could offer more biocompatibility than its counterpart organoclay at similar dose (e.g. cationic surfactant‐modified bentonite). This study promotes designing ‘eco‐safe’ clay‐based sorbents for environmental remediation.

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“…Limited reports are available documenting that organoclays produced by synthetic cationic surfactants are toxic to the natural biotic community. [71][72][73][74] Sarkar et al 72 concluded that few QAC (e.g., HDTMA, ODTMA)-modified clay minerals exhibit toxicity to soil microbes by affecting their enzymatic functions such as dehydrogenase and nitrification. These organoclays are also noxious to earthworms as indicated by up to 62% bodyweight loss in the presence of organoclays (loading rate: 1% in soil).…”

Section: Organoclay: Surfactant-modified Nanoclaysmentioning

confidence: 99%

“…128 Considering the eco-benefits of using food grade non-ionic surfactants (Section 2.2.3) they could be equally useful to clean-up oil spills without damaging environmental habitats and organisms. 94,95 Since the uncontrollable desorption of surfactants from organoclays is a critical constraint during application of such materials, 74 retrieval of pollutant-adsorbed organoclays could be another green strategy. For example, ethyl hexadecyl dimethyl ammonium bromide (EHDAB, CH 3 (CH 2 ) 14 CH 2 N + (CH 3 ) 3 )-metal hexacyanoferrate composite could be an effective material for adsorbing radioactive pollutant (Cs + ).…”

Section: Organoclay: Surfactant-modified Nanoclaysmentioning

confidence: 99%

Biocompatible functionalisation of nanoclays for improved environmental remediation

et al. 2019

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The toxicity of cationic surfactant HDTMA-Br, desorbed from surfactant modified zeolite, towards faecal indicator and environmental microorganisms

Cited by 29 publications

References 24 publications

Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

Modified clays alter diversity and respiration profile of microorganisms in long‐term hydrocarbon and metal co‐contaminated soil

Biocompatible functionalisation of nanoclays for improved environmental remediation

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