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In this research, a novel magnetic mesoporous adsorbent with mixed phase of Fe2O3/Mn3O4 nanocomposite was prepared by a facile precipitating method and characterized extensively. The prepared nanocomposite was used as adsorbent for toxic methyl orange (MO) dye removal from aqua matrix considering its high surface area (178.27 m2/g) with high saturation magnetization (23.07 emu/g). Maximum dye adsorption occurs at solution pH 2.0 and the electrostatic attraction between anionic form of MO dye molecules and the positively charged nanocomposite surface is the main driving force behind this adsorption. Response surface methodology (RSM) was used for optimizing the process variables and maximum MO removal of 97.67% is obtained at optimum experimental condition with contact time, adsorbent dose and initial MO dye concentration of 45 min, 0.87 g/l and 116 mg/l, respectively. Artificial neural network (ANN) model with optimum topology of 3–5–1 was developed for predicting the MO removal (%), which has shown higher predictive ability than RSM model. Maximum adsorption capacity of this nanocomposite was found to be 322.58 mg/g from Langmuir isotherm model. Kinetic studies reveal the applicability of second‐order kinetic model with contribution of intra‐particle diffusion in this process.

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In this study, mixed phase of CaFe 2 O 4 and ZrO 2 magnetic nanocomposite (CaF-ZO-MNC) was fabricated through facile co-precipitation method and was explored for abatement of methyl orange (MO) dye from aqua matrix. X-ray diffraction (XRD) pattern of the synthesized CaF-ZO-MNC depicted significant diffraction peaks of ZrO 2 and CaFe 2 O 4 nanoparticles ensured the crystalline nature of the material. The coexistence of ZrO 2 and CaFe 2 O 4 nanoparticles in the composite increased the BET surface area (95.32m 2 /g) and improves its physicochemical properties as an adsorbent. Enhanced adsorption capacity towards MO dye was found to be 370.37 mg/g from Langmuir model, which is higher than standalone nanoscale Fe, Ca, and Zr metal oxide nanoparticles. The equilibrium adsorption data were found to follow Langmuir isotherm and the adsorption process followed second order kinetic model strictly. Response surface methodology (RSM) was utilized for optimizing the experimental conditions for maximizing the MO dye removal (%) with desirability function approach. Four factors five levels central composite design was implemented for RSM study and the simultaneous interaction of process variables on dye removal efficiency was studied by 3D response surface plots. Maximum MO dye removal of 98.92% was determined with MO dye concentration of 22 mg/L, adsorbent dose of 0.54 g/L, contact time of 25 min at recation temperature of 30°C.KEYWORDS adsorption capacity, kinetic and isotherm study, metal oxide nanocomposite, optimization, toxic dye

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