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Electrocatalytic Degradation of Ammonia Nitrogen in Water

Author: LeTianXiang
Tutor: WeiJie
School: Suzhou Institute of Technology
Course: Applied Chemistry
Keywords: Electrocatalysis Ammonia Removal efficiency Electrode
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 56
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Abstract


Preparation of Ti / SnO 2 -Sb 2 O 3 / PbO 2 Ti / SnO 2 -Sb 2 O 3 / Fe-PbO 2 , Ti / SnO 2 -Sb < sub> 2 O 3 / Co-PbO 2 , Ti / SnO 2 -Sb 2 O 3 / Ni the-PbO 2 are four electrodes, using X-ray diffraction (XRD), inductively coupled plasma emission spectroscopy (ICP), anodic oxygen evolution potential of chlorine evolution potential and electrode strengthen life test methods such as the electrodes were characterized. Through the the electrocatalytic degradation ammonia nitrogen wastewater compared four electrodes prepared by electro-catalytic performance. The results show that in the preparation of the four electrodes, Ti / SnO 2 -Sb 2 O 3 / Fe-PbO 2 electrode having high oxygen evolution potential, the lower the chlorine evolution potential, a strong catalytic activity, the lower the cell voltage and a long service life, is a superior anode material. The intermediate layer of the electrode is a tin antimony oxide, the surface layer is a layer having a catalytic activity of β-PbO . The iron doped improve the the electrode electrocatalytic degradation ability. Meanwhile, the single factor of the current density, and the reaction temperature, pH value, the initial concentration of ammonia nitrogen, plate spacing, chloride ion concentration of ammonia nitrogen wastewater by catalytic degradation effect. The results show that, when the current density of 20 mA · cm -2 , the reaction temperature of 30 ° C, and the pH value is weak alkaline (9.98%), the initial concentration of ammonia nitrogen, 100 mg · L-1 plate distance of 1 cm, the chloride ion concentration of 1100 mg · L-1, ammonia nitrogen removal rate can reach 100%. The first order kinetics and electrocatalytic degradation of ammonia nitrogen wastewater. The orthogonal experiment examines the impact of the current density, solution pH, ammonia initial concentration of chloride ion concentration of ammonia nitrogen wastewater ammonia nitrogen and total nitrogen electrocatalytic degradation effect. The research results show that the primary and secondary relationship of the various factors affecting ammonia electrocatalytic degradation as follows: initial pH value gt; ammonia initial concentration of the gt; chloride ion concentration the gt; current density. Primary and secondary order of the various factors that affect the total nitrogen electrocatalytic degradation as follows: initial pH value gt; ammonia initial concentration gt; current density gt; chloride ion concentration. Considering both ammonia nitrogen and total nitrogen removal indicators to determine the optimum conditions for the electrocatalytic degradation of ammonia die wastewater: the pH value is weak alkaline, ammonia initial concentration of 100mg · L-1, the current density of 25mA · cm -2 , the chloride ion concentration of 1100 mg · L-1. The electrocatalytic degradation process, ammonia Most of into N2, the smaller proportion of nitrite nitrogen in total nitrogen generated in the degradation process. Anode, electro-catalytic degradation actual Ti / SnO 2 -Sb 2 O 3 / Fe-PbO 2 printing and dyeing wastewater, 5 h after ammonia removal rate reached 100% COD removal efficiency of 55.62%, 79.30% total nitrogen removal, the stable operation of the electrode does not appear to fall off.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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