Charge Transfer in MoS2 Based Nanocomposites and its Photocatalytic Applications

Abstract

In present era, degradation of environment has emerged as a major threat due to newlinewidespread industrialization all over the world. Various industries like chemical, newlinetextile, paper, plastic widely use different types of organic dyes (Guo 2016, Liang newline2016, Wang 2016b). These organic dyes are typically azo-based chromophores newlinecombined with different reactive groups and are extensively used due to their newlineapplication based favourable features like easy dilution in water and bold colors newline(Aksu 2005). Since, during hydrolysis process at the time of dyeing, a major portion newlineof these reactive dyes (about 50%) is lost, therefore, waste water from industries newlinecontain large quantity of dyes which poses major threat (Heinfling 1997). Release of newlinethese coloured dye waste water in environment can originate dangerous by-products newlinethrough oxidation, hydrolysis or other chemical reactions taking place in wastewater newlinephase and resist biodegradation (Pagga 1986, Shaul 1991, Reife 1996, Bianco Prevot newline2001, Neppolian 2002a, Saquib 2003, Konstantinou 2004, Kansal 2009). Thus, newlinedisposal of these dyes is a major issue since they bring toxic and hazardous organic newlinepollutants that contaminates natural water resources which not only endangers the newlineaquatic life but also poses severe health threats for humans (Guo 2016, Liang 2016, newlineWang 2016b, Pattnaik 2018). Hence, proper decoloriztion of dyes from industry newlineeffluents require demanding attention. Traditionally, various physical techniques like newlinereverse osmosis, ultrafiltration, adsorption on activated carbon, ion exchange on newlinesynthetic adsorbent resins, coagulation by chemical agents etc. have been commonly newlineused for degradation of dye effluents till date (Tang 1995, Galindo 2001a, Kuo 2001, newlineMeshko 2001, Konstantinou 2004). All these techniques are non-destructive, since newlinethey only change phase of the organic compounds causing secondary level of newlinepollution. Hence, major attention is needed towards either post-treatment of these newlinesolid-wastes or regeneration of such materials which can adsorb these secondary newline