In-situ synthesised polyaniline - halloysite nanoclay composite sorbent for effective decontamination of nitrate from aqueous streams
| Autor: | P.S. Remya Devi, Sangita D. Kumar, Komal Chauhan, Jayshree Ramkumar, Harshala Parab, Niyoti Shenoy |
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| Rok vydání: | 2020 |
| Předmět: |
Sorbent
Health Toxicology and Mutagenesis Composite number Soil Science 010501 environmental sciences engineering.material 01 natural sciences Halloysite Analytical Chemistry chemistry.chemical_compound Nitrate Polyaniline Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Aqueous solution Chemistry Aquatic ecosystem 010401 analytical chemistry Public Health Environmental and Occupational Health Human decontamination Pollution 0104 chemical sciences Environmental chemistry engineering |
| DOI: | 10.6084/m9.figshare.13065874 |
| Popis: | Nitrate (NO3−) is one of the most common contaminants of water bodies with harmful effects to aquatic life and human beings. There is a need for development of sorbents for effective removal of NO3− form aqueous streams. The aim of present study was to develop a Polyaniline modified halloysite nanoclay (PAni-HC) composite sorbent for the uptake of NO3− from aqueous medium. Aniline coated on halloysite clay was oxidised in acidic medium at 4ºC to synthesise PAni-HC composite in one pot reaction. Successful incorporation of polyaniline (PAni) in the clay matrix was confirmed by different surface characterisation techniques. The as synthesised PAni-HC composite sorbent was tested for NO3− sorption in a batch mode in the initial concentration range of 5–500 mg L−1. The analysis of NO3− was performed using ion chromatography in the suppressed conductivity mode. The experimental data were assessed using different kinetic and equilibrium models for understanding the sorption behaviour of the PAni-HC composite. Sorption followed pseudo second order kinetics and intraparticle diffusion model. The maximum Langmuir sorption capacity of PAni-HC composite for NO3− was found to be 27.9 mg g−1. The composite sorbent when treated with groundwater samples exhibited quantitative removal (> 90%) of NO3−thus demonstrating the applicability of the sorbent in real situations. |
| Databáze: | OpenAIRE |
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