石墨基二氧化铅阳极室温电生三价钴的研究  

Study on Electro-generation of Trivalent Cobalt Ion with Graphite-based Lead Dioxide Anode at Ambient Temperature

作　　者：徐泽民[1] 李波[2] 

机构地区：[1]四川大学化学学院,成都610064 [2]四川大学皮革化学与工程教育部重点实验室,成都610065

出　　处：《四川大学学报（自然科学版）》2005年第3期553-557,共5页Journal of Sichuan University(Natural Science Edition)

摘　　要：以库仑分析法为研究手段,考察了在室温下经电化学活化的石墨基二氧化铅阳极电生三价钴的条件及其应用.石墨基二氧化铅电极的电化学活化方法是在0.1mol/L硫酸钠溶液中,在搅拌下于-1.0V还原30s,再于+3.0V氧化5min,反复此过程数次即可.在0.20mol/L硫酸钴0.15mol/L硫酸铁铵5.5mol/L硫酸体系中,氧化电流为20mA、还原电流为40mA时,活化后的电极电生三价钴的库仑效率可达97%以上,三价钴在溶液中的稳定时间可达30min.将电生的三价钴作为氧化剂,对于适量的葡萄糖和邻苯二甲酸氢钾进行氧化,以重铬酸钾法测定的COD值作为对照标准,其氧化率分别可达99.8%和71.2%.It was studied that the graphite-based lead dioxide anode which had been electrochemically activated was used to electrogenerate trivalent cobalt ion by means of coulometry at ambient temperature. The steps of the electrochemical activation for the graphite-based lead dioxide electrode were carried on as follows. First put the electrode into 0.1 mol/L sodium sulfate solution and kept the potential of the electrode at 1.0V (vs. saturated calomel electrode) thirty seconds by accompanied stirring, then changed the potential into +3.0V for five minutes and repeated the operation 3～4 times. Under the conditions that oxidative currents were kept 20 milliamperes and reductive current 40 milliamperes, the coulombic efficiencies of the electro-generation of trivalent cobalt ion produced by the graphite-based lead dioxide electrode would reach more than 97% in the medium of 0.20 mol/L CoSO_(4 )-0.15 mol/L Fe(NH_(4))(SO_(4))_(2)- 5.5 mol/L H_(2)SO_(4). Trivalent cobalt ion in the solution was stable within 30 minutes. When trivalent cobalt ion was used to oxidize the appropriate amounts of glucose and potassium acid phthalate, the oxidative efficiencies of the organic species that were oxidized were 99.8%and 71.2% respectively, compared with the measure values of chemical oxygen demand obtained with dichromate method.

关 键 词：三价钴 室温电生 二氧化铅阳极 库仑分析 

分 类 号：O65[理学—分析化学]