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.
Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds
Magdalena Tuchowska,Magdalena Wołowiec,Agnieszka Solińska,A. Kościelniak,T. Bajda
Published 2019 in Minerals
ABSTRACT
PUBLICATION RECORD
- Publication year
2019
- Venue
Minerals
- Publication date
2019-08-12
- Fields of study
Materials Science, Chemistry, Environmental Science
- Identifiers
- External record
- Source metadata
Semantic Scholar
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- arsenic sorption
Removal or uptake of arsenic species by the modified sorbents in batch experiments.
Aliases: arsenic uptake, arsenic adsorption
- benzyldimethylhexadecylammonium (hdba)
A cationic surfactant used to modify vermiculite at different exchange-capacity loadings.
Aliases: HDBA, benzyldimethylhexadecylammonium
- cation exchange capacity
A dosage basis expressing surfactant loading relative to the clay's exchange sites.
Aliases: CEC
- hexadecyltrimethylammonium (hdtma)
A cationic surfactant used to modify vermiculite at different exchange-capacity loadings.
Aliases: HDTMA, hexadecyltrimethylammonium
- interlayer space
The spacing between vermiculite layers measured as part of the structural characterization.
Aliases: basal spacing
- organo-vermiculite
Vermiculite modified with cationic surfactants for the arsenic sorption experiments.
Aliases: organo-mineral vermiculite
- textural properties
Surface- and pore-related material properties assessed during characterization.
Aliases: texture
- vermiculite
The layered clay mineral used as the parent material before surfactant modification.
Aliases: expanded vermiculite
REFERENCES
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