不同pH下纳米级天然黄铁矿对水中ReO_4^-的去除规律

Reduction-immobilization of dissolved rhenium by pyrite nanoparticles in varied pH

黄铁矿对高锝酸根还原固定的效果受溶液pH的影响较大,研究用高铼酸根代替高锝酸根,通过批实验的方法探究了不同初始pH下天然黄铁矿还原固定高铼酸根的规律。结果表明:接近中性条件下黄铁矿处理高铼酸根效果甚微,如pH=7,反应72h,去除率只有约17%;而在一定的强酸性条件下(氢离子浓度0.3~0.9mol/L),还原固定效果却高达99%;一定的碱性(pH=12)条件下,天然黄铁矿对高铼酸根的作用尽管比较缓慢,但有较好的还原固定趋势。本研究为进一步探究反应机理与实际应用提供了理论依据。

Technetium is one of the main components of nuclear wastes and the effect of pH on aqueous Tc reduction by pyrite is quite evident. A batch experiment was carried out to investigate the reduction-immobilization of dissolved Re by natural pyrite under varied initial pH. The results showed that the nanoparticles reduced dissolved Re by 17% at pH close to neutral（ pH = 7）. Approximately 99% Re was reduced under a strong acid circumstance where the concentration of H^＋ ranges from 0. 3 to 0. 9 mol / L. A steady upward trend was observed while the pH was adjusted to 12. The results warrant further demonstration of reaction mechanism and pratical applications.