Qicheng Qiao

Publications (2)5.29 Total impact

• Article: Kinetics for ammonium ion removal using a three-dimensional electrode system.

  Qicheng Qiao, Yuemin Zhao, Lizhang Wang
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  ABSTRACT: Electrochemical oxidation of ammonium ions (NH(4)(+)) by using a three-dimensional electrode (TDE) composed of IrO(2)-Ta(2)O(5)/Ti anode and bamboo carbon was carried out in this paper. Experimental results reveal that the NH(4)(+) oxidation follows first-order kinetics at lower NH(4)(+) concentration and the rate constant is highly dependent on the applied current density, dosage of chlorine ions and initial NH(4)(+) concentration. In addition, increasing current density, more Cl(-) dosage and higher initial NH(4)(+) concentration are beneficial for NH(4)(+) removal. By inspecting the relation between rate constant and those operating factors, an overall empirical equation for estimation of the rate constant of NH(4)(+) oxidation is presented. The estimated model is in good agreement with the experimental results and it could also be used for accurate design of the TDE system.
  Water Science & Technology 01/2012; 67(1):168-73. · 1.12 Impact Factor
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  Available from: aseanenvironment.info

  Article: Kinetic modeling of electrochemical degradation of phenol in a three-dimension electrode process.

  Lizhang Wang, Jianfeng Fu, Qicheng Qiao, Yuemin Zhao
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  ABSTRACT: For giving a reasonable design method of electro-chemistry reactor, based on law of conservation of energy and law of conservation of charge, using a series of assumption, theoretical energy model was proposed in this study. By proper mathematics simplification method for the new model which demonstrats the relation between energy demanding and providing of the three-dimension electrode (TDE) reactor, the most important characteristic parameters (K(1), K(2)) which are constant for a certain matter during electro-oxidation process were obtained. Experiments about phenol degradation using TDE reactor filling with granular activated carbon (GAC) were conducted to examine the fitness of new energy equation and experimental data. Results from experiments revealed that the oxidation behavior could be reasonably described using new model and the energy providing can be calculated by following equation: W=1.56x10(14)eta(d(2)/V)C(0)EQ(2)(1+square root of (1+(V lnK)/(3.63x10(13)eta(2)d(2)Q(2)C(0)E))). The calculated results obtained from above equation were in good agreement with experimental data especially at higher phenol removal efficiency. The new energy equation illustrates energy could be easily obtained through the solution of the value of characteristic parameters by simple lab-scale experiments.
  Journal of Hazardous Materials 07/2007; 144(1-2):118-25. · 4.17 Impact Factor