Textile industries releases enormous quantity of waste water containing high concentration of dyes [1]. The non-biodegradable nature dye baths causes severe environmental troubles [2]. Rhodamine B is one of the predominant xanthene cationic dyes, is generally used in industry as a dye for paper, silk, wool, jute leather, cotton. The xanthene dyes (rose bengal, eosin Y and rhodamine 6G, etc.) are used as fluorescent markers in constitutional nanosized studies, photosensitizers and laser dyes. They have long been familiar to be harmful, to insects (insecticide). They are toxic if consumed by human and animals and cause irritation to the skin, eyes and lung [3,4]. They described the utilization of Plectranthus amboinicus leaf extract [5] as reducing agent for the synthesis of AgNPs as a catalysts which shows high antimicrobial activity. The first time synthesis of SnO2 NPs using Plectranthus amboinicus leaf extract as reducing agent were reported here as a reference [5]. In the presence of NaBH4, electron transfer occurs due to the catalytic reductive degradation of organic dye molecules by metal nanoparticles (MNPs), which is responsible for reducing speed of the reaction [6-11].
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