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Environmental Nanotechnology Approaches for the Remediation of Contaminants
Published in M.H. Fulekar, Bhawana Pathak, Bioremediation Technology, 2020
Sunlight assisted green synthesized transition metal oxide (ZnO, CuO, Co3O4, NiO and Cr2O3) nanoparticles were able to photocatalytically degrade the 80% to 88% of the dyes in a short period of 180 minute depending on the sizes of respective nanoparticles (Shanker et al., 2016a). Potassium metal hexacyanoferrate KMHCF nanoparticles obtained with aid of A. marmelos degraded almost 95% of organic colorants (Jassal et al., 2016a). Using Morinda tinctoria leaf extract silver nanoparticles were synthesized and effectively degraded 95% of dye in 72 hours under sunlight irradiation. In addition to this, Polygonum Hydropiper was also used as a biogenic source for synthesizing silver nanoparticles with high catalytic efficiency in degrading MB completely within thirteen minutes. Yeast (Saccharomyces cerevisiae) extract was also utilized for synthesizing silver nanoparticles which were effectively applied for degrading ∼90% of MB within 6 hours. A high degradation of 98% for Orange II was reported using green synthesized bimetallic Fe/Pd nanoparticles, whereas, only 16% of the dye was degraded using Fe nanoparticles. Green synthesized copper oxide nanoparticles and ZnO/Graphene Oxide (GO) nanocomposite were also used for decolorization of the dye.
Green synthesis: Photocatalytic degradation of textile dyes using metal and metal oxide nanoparticles-latest trends and advancements
Published in Critical Reviews in Environmental Science and Technology, 2020
P. C. Nagajyothi, S. V. Prabhakar Vattikuti, K. C. Devarayapalli, K. Yoo, Jaesool Shim, T. V. M. Sreekanth
Vanaja et al. (2014) reported the Morinda tinctoria leaf mediated synthesis of Ag NPs. The green synthesized Ag NPs were spherical and in size range from 79–96 nm. The calculated percentage of MB dye degradation using Ag NPs was 95.3% in 72 h, indicating that Ag NPs exhibit excellent photocatalytic activity. AgNPs have been synthesized from Cocos nucifera mesocarps extract (Maria, Aiswarya, Vidya, & Saidutta, 2017). At pH 11, the synthesized AgNPs were spherical, monodispersed and a size ranging from 40-50 nm. The photocatalytic activity results revealed that NPs successfully degradation (75%) of MG dye under solar radiation. TOC and COD degradation rates are 90.8% and 42.4%, after 6 h irradiation time, demonstrating that the complex MG molecule is simpler products of less harmful nature. These synthesized AgNPs needs continued irradiation for a longer time may further reduce the COD and TOC levels, hence leading to complete mineralization of the MG dye.