Herein we report the covalent grafting of chitosan on graphene oxide (GO) followed by a simple approach for anchoring silver (AgNPs) and gold (AuNPs) nanoparticles onto a chitosan grafted graphene oxide surface by a NaBH4 reduction method. Catalytic activity of prepared heterogeneous GO grafted chitosan stabilized silver and gold nanocatalysts (GO-Chit-Ag/AuNPs) was explored for the reduction o...

I. Introduction Extensive usage of dyestuffs and its disposal are the important sources for the today's environmental contamination. Different types of chemical and physical processes such as chemical coagulation, activated carbon adsorption are used for pollutant removal in the textile industrial wastewater, but they just transfer contaminants from one phase to another that needs further and u...

The results of earlier investigations of the carcinogenic action of azo dyes in rats were summarized by Kinosita in 1937 and 1940 (22, 23), and by Hartwell in 1941 (17). Since then much work has been done involving various types of controlled, restricted diets and a theory has been evolved (19) to account for the activity of certain dyes and the inactivity of others. A short review of this work...

OBJECTIVE To determine if a causal connection exists between food additives and various medical complaints. DESIGN Literature study. METHOD Medline over the period January 1966-January 1999 was searched for articles on the following substances not containing protein and lactose: monosodium glutamate (MSG), sulfites, azo-dyes (tartrazine, sunset yellow, azorubin, amarant, cochineal red), ben...

The various soluble liver protein-carcinogen conjugates produced in vivo by two hepatocarcinogens have been resolved and analyzed according to molecular size. In addition, the molecular sizes of the principal soluble conjugates of three types of carcinogens have been compared in order to deduce whether they originate from a common or similar target pro tein. Adult male rats were fed the liver c...

The results of earlier investigations of the carcinogenic action of azo dyes in rats were summarized by Kinosita in 1937 and 1940 (22, 23), and by Hartwell in 1941 (17). Since then much work has been done involving various types of controlled, restricted diets and a theory has been evolved (19) to account for the activity of certain dyes and the inactivity of others. A short review of this work...

Wastewater from the textile industry can contain a variety of polluting subst-ances including dyes. Increasingly, environmental legislation is being imposed to control the release of dyes, in particular azo-based compounds, into the enviro -nment. The ability of microorganisms to decolourise and metabolise dyes has long been known, and the use of bioremediation based technologies for treating t...

Industrial dyeing processes produce a large amount of wastewater that contains many organic compounds such as different type of dyes and pigments, dispersing agents, surfactants which are difficult to treat. Considering that little studies have been done on biodegradation of oil-soluble azo dyes, the lake of this issue is completely felt. In this study, biotrea...

Degradation of dyes especially, azo dyes are difficult due to their complex structure and synthetic nature. The main objective of this study was to evaluate the Fenton-biological (aerobic) treatment train for decolorization and mineralization of azo dyes viz. Reactive Black 5 (RB5), Reactive Blue 13 (RB13) and Acid Orange 7 (AO7). The objective of Fenton treatment was only to decolorize the dye...