Phenol Electrochemical Degradation Of Influencing Factors

Phenol is one of the most risky environmental pollutants for its high chemical oxygen demand and toxicum. In addition, It is difficult to be biodegraded and its amount of discharge is large so the polluted area is wide. The technology of electrocatalysts oxidation, employed to degrade organics, has aroused the interests, home and abroad, for the advantage of efficient oxidation power, simple technics, and with no secondary pollution.The experiment, concerning electrocatalysts oxidation technology disposing hydroxybenzene polluted water, tests the degradation characteristics of phenol in Ti/PbO₂, Pt, and graphite electrode. The result shows that Ti/PbO₂ is more effective.The phenol is electrolyzed with constant electronic current in tri-electrode non-membrane electrolytic bath. With Ti/PbO₂ taken as anode, Ti board as cathode, and saturated potassium chloride calomel electrode as reference, it is researched the effect of the factors, such as primary concentration, electroanalysis timing, temperature, PH value, current and so on, on the declining rate of chemical oxygen removel rate and current coefficient of performance. Based on the research, the best technological condition has been worked out.The experiment also tests the effect of metal cation and anion on the degradation of indirect electro-oxidated phenol. The linear volt-ampere scanning has been carried out with CHI660b, the electronic chemistry apparatus. Comparing the current concentration, changed with electrode potential, it is examined tentatively the function of Mn²⁺,Ni²⁺ and anion ClO^-,Cl^- dealing with phenol degradation of indirect electro-oxidation.Eletrolyzing the ionic above (liquid with phenol) should use liquid chromatography to get the sample (phenol and the products of degradation) analyzed with quantitive approach to observe the effect of individual ion on phenol change and dissolving at different electrolysis time.The result shows that Mn²⁺,Ni²⁺,Cl^-, and ClO^- promote the degradation of phenol to some extent; in another word, the direct ecletro-oxidation is better than degradation in the same condition. HPLC measures the concentration of phenol and the products in the wastewater, pre-and-pro-degradation. Based on the data, it is proposed the eletronic chemistry mechanism of phenol with and without ionic. The products of oxidated phenol include hydroquinone, pyrocatechol, para-benzoquinone, fumaric acid, cis-butenedioic acid, dicarboxyl, and etc., while the ultimate products are carbon dioxide and water.This research is innovative for it offers theoretic reference for wastewater disposal technology——electrocatalysts degraded phenol.