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In this paper, we reviewed the present status of synthesis of nano structured materials for technological development as bimetallic, trimetallic and various organic, inorganic polymers nanocomposites in the field of nanosciences. Nanocomposites play an important role in the field of sciences, engineering and industries due to their high catalytic power, high optical, electrical and mechanical properties, which can be very useful in the field of biosensors, nano medicines and many more as social welfare factor. There are many techniques used for the preparation of nanocomposites. Among them, green method is commonly used technique for the synthesis of nanomaterials which is cost-effective, eco-friendly and less hazardous materials for the environment. Here we attempt to present an elaborate work done in the field of nanocomposites dwelling upon their advantages, challenges and future prospects.

Green synthesis of nano structured materials isan emerging field for the researchers working in the field of chemical, physical, life sciences, engineering and medical sciences, for the welfare of society.In the present study green synthesis of silver nanoparticles (AgNPs)was performed by using flowers of Bistorta macrophylla, a medicinal herb of polygonaceae family of Garhwal Himalayas. For green synthesis of AgNPs, the aqueous flowers extract and the aqueous solution of AgNO3(of 5 milli molar concentration) were well mixed in ratios of 1:9.The metal ion present in the solution reduced Ag+1 to Ag0 within three to four days, which was characterized by color change observation, UV, SEM-EDX, XRD, TEM etc. The absorption maxima of AgNPs of Bistorta macrophylla flowers (BMF) was obtained in the range of 451– 454nm for 5mM concentration of AgNO3, and the SEM images revealed that the average clustersize of synthesized Ag nanoparticles from 5BMF1:9ranges from 20 μm– 23μm, while the EDX analysis four elements show their presence as Ag (51.44 weight %), C (22.45 weight %), Cl (1.18 weight %) and O (22.24 weight%) in the synthesized AgNPs of 5mM(BMF1:9).XRD revealed that the crystals nature of synthesized AgNPs were cubic, and TEM results shows that the biosynthesized nanoparticles are agglomerated and irregular shaped in which size ranging from 12 nm to 38 nm. Synthesized AgNPs were also found to be active for potent antibacterial activity against various pathogenic and harmfull bacterial strains of humans like Pseudomonas Sp.(19.5mm), Bacillus cereus(21 mm) and CoNS (Coagulase Negative Staphylococci) (16.4 mm).Synthesized nanomaterial may be active for efficient clinical applications.

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Abstract-Dyes are chemical compounds which are used to convey colour to various materials, but during the processing and operation it produces toxics and hazardous side product which is very harmful to ecosystem and biodiversity. Researchers are developing various methods to degrade such toxic dyes and use of noble metal nano particle as a catalyst is emerging field of interest among scientific community. In this research article we had scanned our previously synthesized silver nanoparticle from Citrus medicapeels extracts; Synthesis and characterization were previously reported by authors.SynthesizedAgNPs has excellent photo-catalytic potential against various toxic dyes like Methylene blue, Rose bengal, Acridine Orange, Methyl Orange. Our nano-catalyst methylene blue nearly 52.15% in 5 hours while in absence of nano-catalyst dye degrades nearly32.85%. It is also capable of degrading acridine orange study shows it degrade Acridine orange dye 58.74% in just 4 hours and rose bengal dye 59.57 % followed by 4 hours of Continuous UV absorption. It also degrades methyl orange dye nearly 52% in 10 hours of solar irradiation. Synthesized AgNPs can be used as photo-catalyst for degrading toxic dyes.