【摘要】 研究了红壤、水稻土、粉煤灰三种介质对水中Cr6+的吸附与还原作用,对比研究了pH对其的吸附与还原性能的影响,以及最佳pH条件下三种介质对Cr6+的吸附与还原速率。试验结果表明,三种介质都对Cr6+表现出不同程度的吸附和还原作用。红壤在pH=2时对Cr6+的吸附还原作用最强,水稻土和粉煤灰在pH=1时对Cr6+的吸附还原作用最强,红壤和水稻土的累积吸附量与时间的关系符合Elovich方程。红壤和粉煤灰对Cr6+的吸附速度较快。三种介质相比较,红壤对Cr的吸附效果最好,粉煤灰对Cr6+的还原作用最强。更多还原

【Abstract】 Three media, laterite, paddy soil and coal fly ash, were used to adsorb and deoxidize Cr6+. The influence of pH and the effects under the optimal pH were compared. The results showed that three media all worked on Cr6+ adsorption and deoxidization in different degree. Later ite reached the highest point at pH 2, while paddy soil and coal fly ash at pH 1. The adsorption curves of laterite and paddy soil accorded with Elovich model. The adsorption velocity of laterite and coal fly ash was faster. Laterite was the best adsorbent, and coal fly ash was the best reducer.更多还原