【摘要】 研究了钢渣含铁废物,以及添加Fe(Ⅱ)后钢渣-Fe(Ⅱ)体系对硝基苯还原转化的可行性及化学机理.实验在20±2℃及转速为30 r.min-1条件下进行,结果表明,单独钢渣体系对硝基苯的吸附和还原转化能力有限,其还原能力与钢渣本身残存的还原活性组分Fe(0),FeO有关.钢渣与Fe(Ⅱ)的表面结合系统能够提高硝基苯的还原转化速率.溶液中钢渣量大于12 g.L-1时,混合液pH值范围为11~12,硝基苯可在1h内完全转化.降低钢渣用量使混合液酸碱度稳定在中性,硝基苯转化速率减慢,高效液相色谱分析结果证实硝基苯还原转化遵循硝基苯→亚硝基苯→羟基苯胺→苯胺的途径.更多还原

【Abstract】 The paper presents a research of the feasibility to use steel slag,byproducts from iron and steel-making industries as a new reactive material for nitrobenzene reduction and an investigation of the reductive transformation of nitrobenzene in the combined system of steel slag and Fe(Ⅱ).The research was conducted at the temperature of 20±2 ℃ and the rotation speed of 30 r·min1.Results show that steel slag has limited capacity to adsorb and reduce nitrobenzene due to the contained active compounds of Fe(0) and FeO.The combination of steel slag and Fe(Ⅱ) can significantly enhance the reduction rate of nitrobenzene.And in the pH range of 11～12,when steel slag dosage is more than 12 g·L-1,nitrobenzene is observed completely transformed in 1 h due to the newly formed Fe(OH)2.The reaction rate can be slowed down under neutral condition,and high performance liquid chromatography(HPLC) analytical results further show that the reductive transformation of nitrobenzene follows the sequence of nitrobenzene,nitrosobenzene,hydroxyaniline and aniline.更多还原