Modified lead dioxide for organic wastewater treatment: Physicochemical properties and electrocatalytic activity

Abstract

An investigation on lead dioxide electrodeposition from methanesulfonate electrolytes additionally containing Ni 2+ is reported. It is shown that the lead dioxide electrodes micromodified by nickel have different physicochemical properties vs. nonmodified PbO 2-anodes, that are formed during the deposition. The electrocatalytical reactivity of the electrodes involved in comparison to both the oxygen evolution, as well as to the electrooxidation of 2,4-dichlorophenoxyacetic (2,4-D) acid is investigated. The processes of electrochemical oxidation of 2,4-D on various materials occur qualitatively with the same mechanism and differ only in the reaction rate. It is shown that the Ni-PbO 2-anode possesses the highest electrocatalytic activity: the destruction rate of 2,4-D on it increases 1.5 times in comparison with the unmodified lead dioxide. The chemical oxygen demand (COD) of a 0.4 mM solution of 2,4-D, determined by the dichromate method, is 90.0 mg dm-3 which is 94 % of the theoretical value.

Material Selection And Optimization Of Conditions For Electrooxidation Of Nitrofurazone: A Comparative Study Of Tin And Lead Dioxides

“…Morphology and physico-chemical properties of materials.-The morphology and physico-chemical properties of lead dioxide are described in our previous publications in detail. 14,34,35 SEM/EDAX experiments were performed to evaluate the amount and distribution of dopants in SnO 2 (see Fig. 1).…”

“…It is recognized that the efficiency of electrooxidation of organic pollutants depends primarily on the anode material, the nature of the electrolyte, as well as the structure and composition of the toxicant. 14 It is believed 15 that the process of electrooxidation of organic compounds occurs via the mechanism where the secondary transfer of oxygen and adsorbed on the surface of the electrode or free hydroxyl radicals is preferred, rather than direct electron transfer from the compound to the anode. When choosing an electrode material for aqueous solutions, first of all, it is necessary to pay attention to their high mechanical and chemical stability, as well as satisfactory electrical conductivity.…”

Electrosynthesis and catalytic activity of PbO2‐fluorinated surfactant composites

“…According to the literature, 36,37 at high anodic potentials, the electro-oxidation of most organic substances also proceeds with the participation of oxygen-containing particles chemisorbed on the electrode. 4-Chlorophenol was chosen as model compound in order to study the effect of C 4 F 9 SO 3 K on the catalytic activity of PbO 2 -based composite electrodes with respect to organic substances.…”

Ampisilinin Sn/Sb/Ni-Ti Anotlarla Elektrokimyasal Olarak Giderimine Çeşitli Parametrelerin Etkisi

“…Ancak anotların fizikokimyasal özelliklerinin doğrudan hazırlanma yöntemleri ile ilgili olduğu bilinmektedir. Bileşim oranları, parçacık boyutu, yüzey yapısı, özgül yüzey alanı ve bağlama kuvveti anot performansını doğrudan etkilemektedir [82].…”