【摘要】 以含PdCl₃SC（NH₂）₂^-溶液为原料,采用Fe-H₂O₂还原法回收溶液中的钯,研究了还原过程的机理,考察了pH、还原时间、H₂O₂用量和铁粉用量对还原率的影响。结果表明,铁粉被氧化后的Fe²⁺可催化H₂O₂而产生氧化能力极强的·OH自由基,该自由基对复杂的PdCl₃SC（NH₂）₂^-结构具有很强的破坏力,使稳定的PdCl₃SC（NH₂）₂^-以PdCl ₄^2-形态分离出来,提高了铁对钯的还原性能。在溶液体积20mL,25℃,pH=2,H₂O₂用量0.10mL/mL,反应时间60min和铁粉用量0.50mg/mL的条件下,钯的平均还原率可达99.25%。更多还原

【Abstract】 PdCl₃SC（NH₂）₂^-in solution was reduced with Fe-H₂O₂ to recover palladium.Mechanism of reduction was investigated.Influences of pH value,reduction time,dosage of H₂O₂ and iron powder on reduction rate of palladium were explored.The results show that free radical of·OH with strong oxidation ability is produced.Free radical can destroy construction of palladium-thiourea-chlorine complex ion,which makes PdCl₃SC（NH₂）₂^-change into PdCl ₄^2- and increase reducing rate.Average reduction rate is 99.25% under the optimum conditions including volume of solution of 20mL,pH value of 2,reduction time of 60 min,dosage of H₂O₂ of 0.10 mL/mL,and amount of iron powder of 0.50mg/mL.更多还原