纳米四氧化三铁吸附水中汞离子的研究

以纳米Fe₃O₄颗粒作吸附剂，研究其用量、粒径、吸附温度以及pH值等因素对Hg²⁺吸附效果的影响，考察了纳米Fe₃O₄颗粒对水中Hg²⁺的吸附性能，并对吸附结果的重现性和吸附机理进行了研究。结果表明：纳米Fe₃O₄颗粒对水中Hg²⁺的吸附去除率随其用量的增加、粒径的减小而增大；对Hg²⁺吸附的最佳温度为19℃、最佳pH值为3.5，此pH值不需要经过酸或碱调节，便于控制；实验的重现性良好；纳米Fe₃O₄颗粒吸附水中Hg²⁺以物理吸附为主。纳米Fe₃O₄颗粒对Hg²⁺的吸附符合Freundlich吸附方程，显示了很强的纳米效应，是一种具有较好应用前景的Hg²⁺吸附剂。

Adsorption of Hg2+ from water by nano-Fe3O4 particles

The adsorption properties of Hg2 on nano-Fe3O4 particles have been studied and the effects of varying the dosage,particle size,temperature and pH on the adsorption process investigated.The reproducibility of the adsorption process and the adsorption mechanism were also studied.It was found that the removal ratio of Hg2 increased with increasing dosage of nano-Fe3O4 particles.The adsorption effects also increased with decreasing particle size,and were enhanced at low temperature,showing that physical adsorption was involved. The optimal pH value was found to be 3.5,which is conveniently obtained without adjustment by addition of acid or alkali being required.The adsorption showed good reproducibility and was consistent with the Freundlich equation.The significant nano-effects observed suggest that the nano-Fe3O4 is a promising adsorbent for Hg2 .