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Abatement of Cr(VI) and As(III) by MnO2 loaded MCM-41 in wastewater treatment
YunHai Wu,Shengxin Yang,Meili Zhang,Ayinigaer Aierken,Yunying Wu 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.8
Manganese dioxide (MnO2) loaded MCM-41 (MnO2/MCM-41) was used as adsorbent to remove Cr(VI) and As(III) from aqueous solution. The adsorbent was synthesized and characterized. Effect of pH on the removal of Cr(VI) and As(III) was investigated. The desired pH of aqueous solution was 2 for the removal of Cr(VI) and 4 for the removal of As(III). Besides, the adsorption of As(III) and Cr(VI) can be well described by Langmuir and Freundlich isotherm models, respectively. The kinetic data can be successfully depicted by pseudo-second-order model. Moreover, external and intra-particle diffusion were found to be rate-controlling steps of the adsorption process. Thermodynamic analysis suggested that the adsorption process was spontaneous and endothermic. In a binary system, the presence of Cr(VI) and As(III) slightly reduced the removal efficiency of each other. The desorption study showed 0.1mol/L NaOH liquor held good desorption ability for metal loaded MnO2/MCM-41.
Jiong Zhang,Yunhai Huang,Weidong Liu,Liankun Wang,Chao Yang,Lin Zuo 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.1
This paper presents a micromechanical method to analyze the thermal stresses in a finite plane containing multiple elliptical inclusions. Firstly, the Eshelby’s equivalent inclusion method is employed to solve the elastic fields of a two-dimensional infinite plane containing multiple elliptical inclusions under a uniform temperature change. Both the interior Eshelby’s tensor and the exterior Eshelby’s tensor are employed. Then the boundary of the plane is modeled by continuous distributions of dislocation densities. By combining the two steps, a system of singular integral equations is formulated based on the traction-free boundary condition. Then the thermal stresses of the plane can be obtained by the superposition of the stresses obtained by the Eshelby’s equivalent inclusion method and distributed dislocation method. Additionally, some examples are given to show the effects of the presented method. The effects of the material constants, geometric parameters and fiber packing arrangement on the thermal stresses are also studied.