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RISS 인기검색어
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- 저자 : Yunhai Wu (검색결과 5 건)
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Phosphorus Release from Lake Sediments: Effects of pH,Temperature and Dissolved Oxygen
YunHai Wu,Yajun Wen,Jianxin Zhou,Yunying Wu 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.1
Sediments can release Phosphorus (P) into overlying water under certain environmental conditions, which may have a significant impact on water quality and result in continuous eutrophication. We used laboratory experiments to evaluate effects of pH,temperature, and Dissolved Oxygen (DO) on P release from Lake Xuanwu, China. The results demonstrate that effects of pH on P release from sediments were distinct; more P was released under alkaline conditions than acidic conditions, but the least amount of P was released under neutral pH. Increasing temperature resulted in more release of P and a longer time to achieve equilibrium between sediment P release and P in overlying water. Influences of DO supply levels on P release were also quite significant; anaerobic conditions were more conducive to the release of P than aerobic conditions. Orthogonal experiments show that the 3 significant factors on P release from sediments were, in descending order, DO, temperature, and pH. These findings have important management implications for Lake Xuanwu.
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Optimizing adsorption of arsenic(III) by NH2-MCM-41 using response surface methodology
YunHai Wu,Yanping Jin,Julin Cao,Palizhati Yilihan,Yajun Wen,Jianxin Zhou 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Response surface methodology (RSM) was used to optimize process parameters for arsenic (As(III)) removal from aqueous solution using amine-functionalized MCM-41 (NH2-MCM-41). Four independent variables such as pH, initial metal concentration, temperature and adsorbent dosage were investigated. The optimal conditions to remove As(III) by NH2-MCM-41 was found to be pH 5.62, initial As(III) concentration 5.00 mg/L, temperature 20 8C and NH2-MCM-41 dosage 5.00 g/L. XRD, FTIR and SEM analyses testified to the obvious change of the surface morphology and the presence of metal on the sorbent after adsorption. 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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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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YunHai Wu,XianMiao,Li Jiang,Bin Li,ShiXun Feng 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.3
The low cost fresh biomass of Saccharomyces cerevisiae (S. cerevisiae) was utilized for removal of Chromium ion from aqueous solution. The maximum biosorption was found to occur at pH 1.0. The biosorption capacity of S. cerevisiae was found to be 3.89 mg/g for a solution with initial Cr(VI) concentration of 50 mg/L at 35℃. Several biosorption isotherms were used to fit the equilibrium data, indicating biosorption relied mainly on physical adsorption onto heterogeneous surface. Kinetic models were evaluated and we found that pseudo-second-order rate kinetic model showed better correlation, and the biosorption of Cr(VI) was governed by film diffusion as well as intraparticle diffusion. Thermodynamic constants indicated that the biosorption was spontaneous and endothermic. Fourier transform infra-red (FTIR) spectroscopy was used to reveal the main function groups of biosorption, which were hydroxyl, amine groups, C-H of the alkanes, C=O and S=O.
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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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