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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.
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Yunhai Wu,Zhu Ming,Shengxin Yang,Yiang Fan,Peng Fang,Haitao Sha,Ligen Cha 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
The adsorption mechanism of Cr(VI) uptake onto Bamboo Charcoal grafted by Cu2+-N-aminopropylsilanecomplexes (BC/Cu-N) was investigated. The properties of BC/Cu-N were characterized using XRD, FTIR,SEM, EDS, potentiometric acid–base titration and electrochemical analysis. Results indicated that theframework integrity of BC was kept aftermodification and the quantity of functional groups on BC/Cu-Nsurface has changed. There existed functional groups on the BC/Cu-N which could consume OH and thepHpzc was found to be 6.20. Moreover, electrochemical analysis showed that new electron transferpathway was imported. Parameters such as pH, initial Cr(VI) concentration, adsorbent dosage andtemperature were optimized using RSM. Analysis of variance of the quadratic model for Cr(VI) wassuitable to predict the adsorption of Cr(VI) (F value = 134.23 and P value < 0.001) with a high correlation(R2 = 0.9921). The results showed that the initial Cr(VI) concentration and the adsorption capacity ofCr(VI) were positively related. Adsorption data of Cr(VI) were better fitted by Sips, Temkin and D-Rmodels with the maximum adsorption capacity of 17.9383 mg/g. In addition, the pseudo second-orderkinetic model was found to be more suitable for the adsorption of Cr(VI).
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