determination of optimal conditions for dye adsorption using hydrogel containing zinc oxide and carbon quantum dots by experimental design

This research investigates the impact of pollutant degradation on the nanocomposite in the presence of ultraviolet light. in this study, the experimental design method was used to optimize the experimental conditions and analyze the removal of rhodamine b dye by the hydrogel/zinc oxide/carbon dots nanocomposite under ultraviolet light. the key parameters examined in this process are the amount of adsorbent (ranging from 0.25 to 1.5 g) and time (ranging from 30 to 135 min). the influence of ph on adsorption is disregarded due to its negligible effect. the analyses demonstrate a strong correlation between the predicted values and the experimental data. the study demonstrates the successful degradation mechanism under ultraviolet light. the results confirm the selection of degree 2 models based on a greater p-value at a confidence level above 95 %. the regression coefficient (r2 = 0.9454) validates the suitability of the model. the relationship between time and the adsorbent amount is investigated through response surface diagrams, revealing that an increase in both parameters leads to a higher percentage of removal. consequently, the maximum removal is achieved at 135 min and 1.5 g of adsorbent. furthermore, the contour diagram predicts the adsorption yield based on the amount of adsorbent and time. overall, the results indicate that the use of the nanocomposite with ultraviolet light is an effective approach for pollutant removal. the removal percentage increases with longer exposure times and greater adsorbent amount.