Abstract
The graphene based materials in water pollutant treatment have recently gained significant attention due to their high surface area, high mechanical strength and tuneable surface chemistry. However, the relatively high cost, poor hydrophobicity, low adsorption capacity, and recyclability limit their practical application. Here in, driven by need, we report a simple approach for the synthesis of graphene quantum dots (GQDs) via pyrolysis, preferred because of high controllability and fewer defects over chemical exfoliation methods. The synthesized GQDs are further embedded on bacterial cellulose nanopaper (BCN) and characterized using spectroscopy and microscopy techniques. Furthermore, the well-ordered multi-layered GQD embedded BCN based filtration assembly is designed and developed for treatment of water pollutants and industrial dye wastewater. The multi-layered GQD embedded BCN based filtration assembly is validated by purifying industrial dye and heavy metal (Hg2+, Pb2+) with removal efficiency of 99.6% and 97%, respectively. Our multi-layered filtration assembly demonstrated significant membrane regeneration capacity until six cycles. The isotherm model also showed an appropriate fit exhibiting good adsorption behaviour. Our multi-layered filtration assembly can be established as a promising filtration assembly for inexpensive, efficient and low energy applications in wastewater treatment.
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Acknowledgments
We gratefully acknowledge Department of Science and Technology, Govt of India (DST/TMD(EWO)/OWUIS-2018/RS-20(G)) for financial support.
Dr Gajendra Singh Vishwakarma gratefully acknowledge GSBTM, Govt of Gujarat, India (GSBTM/JDR&D/604-2019/307) for financial support. We acknowledge Mr. Ravindrasinh Rehewar, CEO, SVA Robotics, India for the support of product design and development.
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Pandya, A., Shah, K., Prajapati, H. et al. GQD embedded bacterial cellulose nanopaper based multi-layered filtration membranes assembly for industrial dye and heavy metal removal in wastewater. Cellulose 28, 10385–10398 (2021). https://doi.org/10.1007/s10570-021-04174-1
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DOI: https://doi.org/10.1007/s10570-021-04174-1