Abstract
NPs synthesis, characterization and azo-dye degradationA facile cost effective wet chemical method of synthesis is proposed for Cu-NPs, CuO-NPs and Cu-doped ZnO-NPs. The nanomaterials are opto-physically characterized for nano standard quality. Cu-doped ZnO-NPs based catalytic system is found to possess most efficient photocatalytic activity in degradation of two organic azo-dyes namely methyl red (MR) and malachite green (MG) that are released as industrial effluents in eco-environment intercollegium. Two possible photocatalytic degradation pathways are proposed to understand the mechanism of interaction prevailing during the mineralization of MR and MG dyes. Such study provides insight for waste water management. The uniqueness of the present work is 1) possible routes of MG dye degradation by Cu-doped ZnO-NPs and subsequent intermediate by-products are novel and pioneered of its kind. 2) two new intermediate byproducts are identified suggesting prevalence of multiple MR degradation pathways by Cu-doped ZnO-NPs.Assessment of ecotoxicityFor assessment of residual NPs impact on environment, eco-toxicological assay is performed using plant system (Sesamum indicum L.) as model. The study encompasses seed germination, seedling morphology, quantification of endogenous H2O2 and MDA generation, estimation of DNA double strand break and analysis of cell cycle inhibition. Results highlight reduced ecotoxicity of Cu-doped ZnO-NPs compared to the other synthesized nanomaterials thereby suggesting better environmental applicability in waste water purification.
Highlights
Nanomaterials are significant submicron supra-atomic structures possessing generation potentiality in multidisciplinary scientific applications [1,2]
Release of organic azo-dyes namely, methyl red (MR) and malachite green (MG) as industrial effluents is a major threat to ecosystem [26]; extensively used in paper, rubber, plastic and textile industries [27,28]
Residual nanomaterials released during the process of dye elimination and industrial waste water purification is a potent source of biohazards and can generate ecotoxicity
Summary
Nanomaterials are significant submicron supra-atomic structures possessing generation potentiality in multidisciplinary scientific applications [1,2]. Among the metal oxide NPs, ZnOnanostructures exhibit wide morphological diversities like simple ball shape, micro-nano filapodia, tetrapod, needle-topped nanorosette, among others [2,8,9] Applicational potentiality of such nanoscale structural complexes is significantly assessed based on their photocatalytic [10,11,12,13,14] and UV photodetection and gas sensing [15] ability, antimicrobial [16,17,18,19] and anticancerous [20,21,22] potentiality and for virostatic [23] as well as immune-protective [24] activities among others [25]. The rooted plant species can well be used for assessment of residual toxicity as soil serve as reservoir for released NPs in the ecoenvironmental inter-collegium Such toxicological assessment is significant for selection of nanoparticle based catalytic system towards environmental application. Available literatures addressing photocatalytic potentiality of nanomaterials lack the assessment of environmental applicability and needs to be investigated before reaching to a logical conclusion
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
