The present study is set out to determine the photocatalytic degradation potential of ZnO nanoparticles for effective degradation of Eosin dye. The heterogeneous photocatalytic experiments were carried out by irradiating aqueous dye solutions with ultraviolet light. The influence of effective parameters like flow rate, pH, catalyst dose, and dye concentration was examined. The best degradation efficiency (66.82%) of ZnO Nanoparticles against Eosin dye was achieved within 90 min of reaction time. The Box–Behnken design under the Response Surface Methodology (RSM) was chosen as a statistical tool to obtain the correlation of influential parameters. The optimum values were recorded as follows: 0.59 g, 15.75 ppm and 136.12 ml/min for amount of catalyst, dye concentration and flow rate, respectively. The maximum percent degradation achieved at these conditions was 71.44%.
In this study, bio-adsorbent from barley straw and coconut shell were used as bio-adsorbent to remove methylene blue (MB) from wastewater, which were prepared by refluxing barely straw (BS) and coconut shell (CS) in concentrated sulfuric acid, and have a specific surface area 1.165 and 11.759 m 2 /g for BS-SO3H and CS-SO3H respectively. Several parameters are studied such as pH and initial concentration of dye in wastewater, and it is found that the adsorption capacity is improved in the basic medium; also, it is directly proportional to the initial concentration. The results from the adsorption process were found to be more fitted with Langmuir isotherm than the Freundlich isotherm for both adsorbents, so it confirmed that the adsorption process is monolayer. The maximum adsorption capacity was found to be 256.4, and 344.8 mg/g for barley straw and coconut shell respectively, and the design parameters of packed bed column were calculated for batch adsorption process.
The present study is set out to determine the photocatalytic degradation potential of ZnO nanoparticles for effective degradation of Eosin dye. The heterogeneous photocatalytic experiments were carried out by irradiating aqueous dye solutions with ultraviolet light. The influence of effective parameters like flow rate, pH, catalyst dose, and dye concentration was examined. The best degradation efficiency (66.82%) of ZnO Nanoparticles against Eosin dye was achieved within 90 min of reaction time. The Box–Behnken design under the Response Surface Methodology (RSM) was chosen as a statistical tool to obtain the correlation of influential parameters. The optimum values were recorded as follows: 0.59 g, 15.75 ppm and 136.12 ml/min for amount of catalyst, dye concentration and flow rate, respectively. The maximum percent degradation achieved at these conditions was 71.44%.
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