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Preparation and Characterization of Macroalgae Biochar Nanomaterials with Highly Efficient Adsorption and Photodegradation Ability

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School of Naval Architecture and Mechanical-electrical Engineering, Zhejiang Ocean University, Zhoushan 316022, China
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Institute of Innovation & Application, Zhejiang Ocean University, Zhoushan 316022, China
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College of Environmental and Science Technology, Donghua University, Shanghai 201620, China
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College of Food and Medical, Zhejiang Ocean University, Zhoushan 316022, China
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College of Petrochemical and Energy Engineering, Zhejiang Ocean University, Zhoushan 316022, China
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Authors to whom correspondence should be addressed.
Materials 2018, 11(9), 1709; https://doi.org/10.3390/ma11091709
Received: 9 August 2018 / Revised: 2 September 2018 / Accepted: 4 September 2018 / Published: 13 September 2018
In this study, carbonized kelp biochar (AKB) modified by KOH impregnation and photocatalytic Bi2MoO6/AKB composite (BKBC) nanomaterials were the first time successfully synthesized for efficient removal of dyes in aqueous solution. BET, XRD, FT-IR, and SEM were employed to characterize as-prepared samples. UV-vis and other test results indicated that the removal efficiency of methylene blue (MB) was 61.39% and 94.12% for BKBC and AKB, respectively, which was up to 13 times and 20 times higher in comparison with pure Bi2MoO6 (PBM). In addition, the equilibrium adsorption capacity of MB could reach up to 324.1 mg/g for AKB. This high dyes adsorption performance could be likely attributed to its high specific surface area (507.177 m2/g) and its abundant presence of various functional groups such as –OH and =C–H on AKB. Particularly, the existing of amorphous carbon and transition metal oxides, such as Fe2O3 and Mn5O8, could be beneficial for the photodegradation of MB for AKB. Meanwhile, experimental data indicated that adsorption kinetics complied with the pseudo-second order model well, and all of the tests had satisfactory results in terms of the highly efficient adsorption and photodegradation activity of AKB nanomaterials, which suggested its great potential in wastewater treatment. View Full-Text
Keywords: nanomaterial; kelp biochar; adsorption capacity; photocatalytic activity; removal efficiency nanomaterial; kelp biochar; adsorption capacity; photocatalytic activity; removal efficiency
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MDPI and ACS Style

Zhou, Y.; Zhang, H.; Cai, L.; Guo, J.; Wang, Y.; Ji, L.; Song, W. Preparation and Characterization of Macroalgae Biochar Nanomaterials with Highly Efficient Adsorption and Photodegradation Ability. Materials 2018, 11, 1709.

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