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Physicochemical and Photocatalytic Properties under Visible Light of ZnO-Bentonite/Chitosan Hybrid-Biocompositefor Water Remediation
Content Provider | MDPI |
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Author | Aadnan, Imane Zegaoui, Omar Mragui, Abderrahim El Silva, Joaquim Carlos Gomes Esteves da |
Copyright Year | 2021 |
Description | In this investigation, a hybrid-biocomposite “ZnO-Bentonite/Chitosan” was synthesized using inexpensive and environmentally friendly materials (Bentonitechitosan) and (ZnO). It was used as a photocatalyst for water remediation. The structural, optical, thermal, and morphological properties of the synthesized hybrid-biocomposite were investigated using XRD, FTIR spectroscopy, UV-vis diffuse reflectance spectroscopy, TGA, XPS, and SEM-EDS. The thermal measurements showed that the decomposition of CS was postponed progressively by adding PB and ZnO, and the thermal stability of the synthesized hybrid-biocomposite was improved. The characterization results highlighted strong interactions between the C–O, C=O, $-NH_{2}$, and OH groups of chitosan and the alumina-silica sheets of bentonite on the one side, and between the functional groups of chitosan $(-NH_{2}$, OH) and ZnO on the other side. The photocatalytic efficiency of the prepared hybrid-biocomposite was assessed in the presence of Methyl Orange (MO). The experiments carried out in the dark showed that the MO removal increased in the presence of Zn-PB/CS hybrid-biocomposite (86.1%) by comparison with PB (75.8%) and CS (65.4%) materials. The photocatalytic experiments carried out under visible light showed that the MO removal increased 268 times in the presence of Zn-PB/CS by comparison withZnO.The holes trapping experiments indicated that they are the main oxidative active species involved in the MO degradation under both UV-A and visible light irradiations. |
Starting Page | 102 |
e-ISSN | 20794991 |
DOI | 10.3390/nano12010102 |
Journal | Nanomaterials |
Issue Number | 1 |
Volume Number | 12 |
Language | English |
Publisher | MDPI |
Publisher Date | 2021-12-29 |
Access Restriction | Open |
Subject Keyword | Nanomaterials Environmental Engineering Zno-bentonite/chitosan Hybrid-biocomposite Photocatalysis Methyl Orange Visible Light Mechanism |
Content Type | Text |
Resource Type | Article |