Citric Acid Modified Bentonite for Congo Red Adsorption
Raw bentonite (RB) was chemically modified by citric acid (CA) to obtain a low-cost and environment-friendly citric acid incorporated bentonite (CAB) adsorbent, which was applied for the adsorptive removal of Congo Red (CR). The effect of adsorbent dosage, contact time, ionic strength, surfactant, a...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2019-02-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fmats.2019.00005/full |
| _version_ | 1818435270079414272 |
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| author | Hanbing Zhang Hanbing Zhang Juan Zhou Juan Zhou Yaseen Muhammad Yaseen Muhammad Rui Tang Kun Liu Ying Zhu Zhangfa Tong |
| author_facet | Hanbing Zhang Hanbing Zhang Juan Zhou Juan Zhou Yaseen Muhammad Yaseen Muhammad Rui Tang Kun Liu Ying Zhu Zhangfa Tong |
| author_sort | Hanbing Zhang |
| collection | DOAJ |
| description | Raw bentonite (RB) was chemically modified by citric acid (CA) to obtain a low-cost and environment-friendly citric acid incorporated bentonite (CAB) adsorbent, which was applied for the adsorptive removal of Congo Red (CR). The effect of adsorbent dosage, contact time, ionic strength, surfactant, and pH on adsorption was investigated. Adsorption equilibrium data fitted well with Langmuir model while the Langmuir adsorption capacity of CR on CAB reached up to 384 mg·g−1. Furthermore, CR adsorption on CAB followed pseudo-second kinetic model while intra-particle diffusion was not the only rate-limiting step as determined from intra-particle diffusion model investigation. RB and CAB were characterized by XRD, FT-IR, and BET techniques. A proposed mechanism for the adsorption of CR over CAB suggested the chemical adsorption phenomenon is mainly controlled by chelation, hydrogen bonding, and fixing. |
| first_indexed | 2024-12-14T16:50:13Z |
| format | Article |
| id | doaj.art-5f333bad89dc424bb97019b006ff3d5e |
| institution | Directory Open Access Journal |
| issn | 2296-8016 |
| language | English |
| last_indexed | 2024-12-14T16:50:13Z |
| publishDate | 2019-02-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Materials |
| spelling | doaj.art-5f333bad89dc424bb97019b006ff3d5e2022-12-21T22:54:04ZengFrontiers Media S.A.Frontiers in Materials2296-80162019-02-01610.3389/fmats.2019.00005439081Citric Acid Modified Bentonite for Congo Red AdsorptionHanbing Zhang0Hanbing Zhang1Juan Zhou2Juan Zhou3Yaseen Muhammad4Yaseen Muhammad5Rui Tang6Kun Liu7Ying Zhu8Zhangfa Tong9Institute of Environmental Engineering, College of Resources, Environment and Materials, Guangxi University, Nanning, ChinaGuangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, ChinaGuangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, ChinaGuangzhou of China Light Industry Engineering Co. Ltd., Guangzhou, ChinaGuangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, ChinaInstitute of Chemical Sciences, University of Peshawar, Peshawar, PakistanGuangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, ChinaInstitute of Environmental Engineering, College of Resources, Environment and Materials, Guangxi University, Nanning, ChinaInstitute of Environmental Engineering, College of Resources, Environment and Materials, Guangxi University, Nanning, ChinaGuangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, ChinaRaw bentonite (RB) was chemically modified by citric acid (CA) to obtain a low-cost and environment-friendly citric acid incorporated bentonite (CAB) adsorbent, which was applied for the adsorptive removal of Congo Red (CR). The effect of adsorbent dosage, contact time, ionic strength, surfactant, and pH on adsorption was investigated. Adsorption equilibrium data fitted well with Langmuir model while the Langmuir adsorption capacity of CR on CAB reached up to 384 mg·g−1. Furthermore, CR adsorption on CAB followed pseudo-second kinetic model while intra-particle diffusion was not the only rate-limiting step as determined from intra-particle diffusion model investigation. RB and CAB were characterized by XRD, FT-IR, and BET techniques. A proposed mechanism for the adsorption of CR over CAB suggested the chemical adsorption phenomenon is mainly controlled by chelation, hydrogen bonding, and fixing.https://www.frontiersin.org/article/10.3389/fmats.2019.00005/fullcitric acid modified bentoniteCongo Redadsorption modeladsorption mechanismXRD and FT-IR |
| spellingShingle | Hanbing Zhang Hanbing Zhang Juan Zhou Juan Zhou Yaseen Muhammad Yaseen Muhammad Rui Tang Kun Liu Ying Zhu Zhangfa Tong Citric Acid Modified Bentonite for Congo Red Adsorption Frontiers in Materials citric acid modified bentonite Congo Red adsorption model adsorption mechanism XRD and FT-IR |
| title | Citric Acid Modified Bentonite for Congo Red Adsorption |
| title_full | Citric Acid Modified Bentonite for Congo Red Adsorption |
| title_fullStr | Citric Acid Modified Bentonite for Congo Red Adsorption |
| title_full_unstemmed | Citric Acid Modified Bentonite for Congo Red Adsorption |
| title_short | Citric Acid Modified Bentonite for Congo Red Adsorption |
| title_sort | citric acid modified bentonite for congo red adsorption |
| topic | citric acid modified bentonite Congo Red adsorption model adsorption mechanism XRD and FT-IR |
| url | https://www.frontiersin.org/article/10.3389/fmats.2019.00005/full |
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