Preparation of Manganese Oxide Membrane Coated Zeolite and Characteristics of Treating Manganese Containing Water

Abstract

Abstract: Quartz or manganese sand filters are widely used in water purification plants, however, there are problems such as poor adsorption performance of filter materials and a long time of “start-up period” in the process of contact oxidation manganese removal. In view of this phenomenon, manganese oxide membrane coated zeolite (MOMCZ) was prepared by using zeolite as the matrix material, and potassium permanganate and manganese sulfate were used to generate manganese oxide and then deposit on the surface of zeolite. MOMCZ was combined with the adsorption properties of zeolite and the catalytic oxidation characteristics of manganese oxide. SEM, EDS, XPS, XRD, BET, and Zeta potential analyses were used to observe surface morphology and chemical composite of MOMCZ. The response surface model was used to analyze the effect of adsorption performance of MOMCZ on manganese ions. The results show that manganese oxide membrane on surface of MOMCZ exhibits a three-dimensional complex network structure. The existing forms and molar ratio of Mn element are 51.28% for Mn (Ⅲ) and 48.72% for Mn (Ⅳ). Na_0.55Mn₂O₄(H₂O)_1.5 is the main component of manganese oxide membrane. The specific surface area of MOMCZ is 38.76 m²/g, and the pore size distribution is concentrated in the range of 3～40 nm and the isoelectric point pH value is 2.36. The order of four influencing factors for adsorption of manganese ions by MOMCZ is pH value> load> adsorption time> adsorption temperature. Through model optimization, it is found that the maximum manganese ion removal rate reaches 70.82% at the load of 0.8 mg/g, pH=8.5, adsorption temperature of 23.40 ℃, and adsorption time of 6.58 min. The relative error between the predicted values of experimental model and the actual data values is less than 2.5%. The response surface model of MOMCZ adsorption manganese ion has a high degree of fitting and accurate prediction, and has high feasibility and reference value.

Key words: zeolite, manganese oxide membrane, Na_0.55Mn₂O₄(H₂O)_1.5, adsorption, response surface

CLC Number:

JIN Xing, FU Jinxiang, ZHANG Li, HE Xiang. Preparation of Manganese Oxide Membrane Coated Zeolite and Characteristics of Treating Manganese Containing Water[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3295-3305.

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