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Cheng T.,Jiangsu City Vocational College | Dai Y.Z.,Xiangtan University | Chen C.,Jiangsu University of Science and Technology | Huang Z.Q.,Jiangsu City Vocational College
Asian Journal of Chemistry | Year: 2012

The experiment was conducted to examine the potential of zero-valent iron (Fe 0) as the sole electron donor for reductive dechlorination of 2,4-dichlorophenol by mixed culture. The optimal conditions and the sustainability of 2,4-dichlorophenol dechlorination in Fe 0+microbe system were also investigated. The results showed that, Fe 0 was an effective electron donor to stimulate reductive dechlorination of 2,4-dichlorophenol and 2,4-dichlorophenol (30 mg L -1) could be transformed completely within 68 h. The rate was similar to that with acetate or lactate as electron donor, while the rate was slow with glucose as electron donor. The quantity of Fe 0, inoculation added and pH had a significant effect on 2,4-dichlorophenol dechlorination. The optimal quantity of Fe 0, inoculation added and initial pH was 2.0 g L -1, 646.4 mg volatile suspended solid L -1 and 8, respectively. Fe 0 sustained 2,4-dichlorophenol dechlorination over a long period. 4-Chlorophenol was the intermediate roduct from 2,4-dichlorophenol, but it was difficult to be further degraded.


Chen C.,Jiangsu University of Science and Technology | Cheng T.,Jiangsu City Vocational College
Asian Journal of Chemistry | Year: 2013

Avrami equation was applied to model the formation process of fly ash based Linde F (K) zeolite. The results showed that: (1) Linde F (K) zeolite could be gained through the reaction between fly ash and potassium hydroxide solutions and temperature seriously affected the reaction rate. (2) Avrami equation could be successfully used to analysis the kinetics process of Linde F (K) zeolite growth. (3) The formation of model of this zeolite is heterogeneous and the crystalline is linear growth. (4) The activation energy of zeolite crystalline and nucleation is about 134.5 and 85.4 kJ/mol, respectively.


Cheng T.,Jiangsu City Vocational College | Chen C.,Jiangsu University of Science and Technology | Pan T.,Jiangsu City Vocational College
Asian Journal of Chemistry | Year: 2013

The experiment was conducted to examine the biodegradation of 2,4-dichlorophenol (2,4-DCP) and the variation of COD concentration during the acclimation period of anaerobic microorganism. The effect of acclimation substrates and acclimated culture on the 2,4-DCP degradation was also investigated. The results showed that, the anaerobic microorganism had the potential of degrading chlorophenols. During the acclimation period, the anaerobic culture adapted to the toxicity of 2,4-DCP gradually. The degradation capability and degradation rate of 2,4-DCP improved with the extension of acclimation time. The 2,4,6-trichlorophenol (2,4,6-TCP) and 2,4-DCP acclimated culture for the 2,4-DCP degradation was superior to the 2,4-DCP acclimated culture during the acclimation period. The COD removal rate was enhanced with the long-term coexistence of 2,4,6-TCP and 2,4-DCP. Moreover, Compared to the fresh culture, the acclimated culture improved the 2,4-DCP degradation obviously and the optimal acclimated microorganism was the culture acclimated to 2,4,6-TCP and 2,4-DCP. The COD removal rate in different systems had a relation to the 2,4-DCP degradation in some extent. © 2013 Asian Journal of Chemistry.


Cheng T.,Jiangsu City Vocational College | Chen C.,Jiangsu University of Science and Technology | Pan T.,Jiangsu City Vocational College | Xie W.F.,Jiangsu City Vocational College
Asian Journal of Chemistry | Year: 2013

The experiment was conducted to examine the effect of acclimated culture on the 2,4-dichlorophenol and 2,4,6-trichlorophenol degradation. The variation of the chemical oxygen demand (COD) concentration in different degradation systems was also investigated. The results showed that, anaerobic culture began to degrade 2,4-dichlorophenol and 2,4,6-trichlorophenol almost without lag phase. In the early degradation period, the degradation rate of 2,4-dichlorophenol and 2,4,6-trichlorophenol was relatively lower, but the degradation rate improved obviously in the late degradation period. Compared to the fresh culture, the acclimated culture promoted the degradation rate of 2,4-dichlorophenol and 2,4,6-trichlorophenol. The degradation effect of the culture acclimated to 2,4-dichlorophenol and 2,4,6- trichlorophenol was the best to the other culture. In addition, the degradation rate of organics was the highest in the system of 2,4- dichlorophenol and 2,4,6-trichlorophenol acclimated culture.


Han C.,Jiangsu City Vocational College | Chen C.,Jiangsu University of Science and Technology | Cheng T.,Jiangsu City Vocational College | Xie X.,Nanjing University
MATEC Web of Conferences | Year: 2016

The Test was to examine the adsorption property of Pb(II) irons by Linde type F (K) zeolite. The zeolite was synthesized by fly ash. The adsorbent dosage, pH, reaction temperature and reaction time were investigated. The adsorption isotherm and adsorption kinetics equation were studied. The results showed the adsorbent dosage, pH, reaction temperature and reaction time had significant effects on the adsorption of Pb(II) irons. The removal rate was improved with the increasing of zeolite dosage. The saturated adsorption capacity was decreased gradually. The adsorption of Pb(II) irons tended to saturate when initial pH was 6. With the increasing of temperature, the equilibration time of adsorption was shorter. Langmuir isotherm was more applicable to explain the monolayer adsorption procedure of Pb(II) on Linde type F(K) zeolite. For adsorption kinetics, pseudo-second order model showed better calculation results. © The Authors, published by EDP Sciences, 2016.


Ting C.,Jiangsu City Vocational College | Chen C.,Jiangsu University of Science and Technology | Cheng Hui H.,Jiangsu City Vocational College | Yuan T.,Jiangsu University of Science and Technology
MATEC Web of Conferences | Year: 2016

The batch experiments were conducted to examine the adsorption properties of Ni(II) ions by synthesizing Linde type F(K) zeolite from coal fly ash. Several important parameters were investigated. The adsorption isotherm and kinetics equation were also discussed. The results showed that, the zeolite doses had obvious effect on the adsorption properties of Ni(II). With the increasing of zeolite doses, the adsorption efficiency was improved significantly, and the saturated adsorption capacity was decreased continuously. The adsorption efficiency increased from 12% to 92% as pH increased from 2.0 to 7.0. With the increasing of temperature and contact time, the adsorption efficiency of Ni(II) ions improved obviously. Langmuir adsorption isotherm and Pseudo- first order model showed better calculation results for the adsorption of Ni(II) on Linde type F (K) zeolite. © The Authors, published by EDP Sciences, 2016.


Han C.,Jiangsu City Vocational College | Li Z.,Jiangsu City Vocational College | Shen J.,Nanjing University
Asian Journal of Chemistry | Year: 2015

Pt/TiO2-Cu2O photocatalysts were prepared in the experiments. For these complex oxides, morphology, structure, composition and optical properties were investigated by HRTEM, XRD, ICP and UV-visible techniques, respectively. In addition, in the absence of oxygen, the photocatalytic generation of H2 from methanol over Pt/TiO2-Cu2O under visible light was studied and the effects of Pt content and composition of catalyst on photocatalytic activity were elucidated. The result showed Pt was deposited on the surface of TiO2-Cu2O in a clustered manner with particle size of 5-20 nm. When Pt content reached 1 wt. %, such catalyst exhibited highest photocatalytic activity. After the catalyst of 1% Pt/5% TiO2-Cu2O used for 7 times, the photocatalytic activity in the generation from aqueous methanol of hydrogen remained relatively stable. The catalyst of Pt/TiO2-Cu2O photocatalytic generation of hydrogen from methanol solution achieved through the photo-generated electron of e-reduction of H2O to produce H2. As a result, 327 μmol H2 was obtained after 3 h. © 2015 Chemical Publishing Co. All rights reserved.


Cheng T.,Jiangsu City Vocational College | Chen C.,Jiangsu University of Science and Technology | Xie W.F.,Jiangsu City Vocational College
Asian Journal of Chemistry | Year: 2014

Reaction kinetics of fly ash in Al2O3-NaOH solution system were analyzed by a modified "Jander" equation. After kinetics analysis, only two reaction stages could be found during the reaction process. Stage 1, the reaction process was limited by diffusion through a porous layer. Stage 2, the reaction process was controlled by diffusion through a dense layer. The rate constants of stage 2 were in the order of 7.5 M NaOH (0.00609), Al2O3/Na2O = 0 > 7.5 M NaOH, Al 2O3/Na2O = 0.0066 > (0.00404) > 7.5 M NaOH, Al 2O3/Na2O = 0.013 (0.00301) > 7.5 M NaOH, Al2O3/Na2O = 0.033 (0.00128).


Chen C.,Jiangsu University of Science and Technology | Cheng T.,Jiangsu City Vocational College
Journal of the Chemical Society of Pakistan | Year: 2013

The work focuses on evaluating wet air oxidation and catalytic wet air oxidation technique to degrade refinery spent caustics (original COD is 250,781 mg/L) in a milder operation conditions (150-200°C, 0.2-2.5MPa). The results show that: in non-catalyst WAO, the highest COD degradation conversion could reach about 75% when 200°C, 2MPa oxygen and 300rpm were used. At every temperature, the reaction procedures follow pseudo-first order equations and the activation energy is 45.5 kJ/mol. The reactivity of three main contaminants in wastewater is on the order of sulphide > petroleum > volatile phenol. The COD degradation conversion could improve to about 95% when composite catalyst MnOx-CeOx/γ-Al2O3 (W Mn/Wγ-Al2O3=0.5 and WCe/W MnOx/γ-Al2O3=0.4) was used. The pseudo-first order equations also could be applied for catalyst system and its activation energy decreases to 27.2 kJ/mol. The catalyst could improve the degradation efficiency of petroleum and volatile phenol. Their conversions could increase to 85% and 74% respectively after catalyst used.


Xiaojun C.,Jiangsu City Vocational College | Xianpeng L.,Jiangsu City Vocational College | Peng X.,Jiangsu City Vocational College
2015 International Conference on Computer and Computational Sciences, ICCCS 2015 | Year: 2015

Using empirical analysis, conventional air automatic monitoring system has high precision, but large bulk, high cost, and single datum class make it impossible for large-scale installation. Based on intriducing Internet of Things(IOT) into the field of environmental protection, this paper puts forward a kind of real-time air pollution monitoring and forecasting system. By using IOT, this system can reduce the hardware cost into 1/10 as before. The system can be laid out in a large number in monitoring area to form monitoring sensor network. Besides the functions of conventional air automatic monitoring system, it also exhibits the function of forecasting development trend of air pollution within a certain time range by analyzing the data obtained by front-end perception system according to neural network technology. Targeted emergency disposal measures can be taken to minimize losses in practical application. © 2015 IEEE.

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