【摘要】 研究了模拟日光照射下草酸协同黄铁矿对Cr(Ⅵ)的还原作用机理及其影响因素.结果表明,加入草酸后,反应体系中生成了光化学活性高的草酸铁(Ⅲ)配合物,同时还可能阻止了黄铁矿表面Fe(Ⅲ)水解产物Fe(OH)3和CrxFe1-x(OH)3的生成,从而使黄铁矿还原Cr(Ⅵ)的速率明显得到提高.增加溶液酸度、草酸浓度和黄铁矿质量浓度,有利于Cr(Ⅵ)的还原.更多还原

【Abstract】 The mechanism and experimental factors of Cr(Ⅵ) reduction by pyrite assisted by oxalic acid under simulated solar light irradiation were investigated.The results demonstrated that the reduction of Cr(Ⅵ) by pyrite was markedly accelerated with addition of oxalic acid due to(1) the formation of highly photo-activie Fe(Ⅲ)-oxalate complex in the reaction system and(2) the removal of precipitates including Fe(OH)3 and CrxFe1-x(OH)3.Lower pH,higher oxalic acid concentration and higher pyrite loading in suspension were beneficial to the conversion of Cr(Ⅵ) to Cr(Ⅲ).更多还原