Ni-Fe双金属纳米颗粒的制备及其性能试验研究

Study on preparation and properties of Ni-Fe bimetallic nanoparticles

为制备吸附性与还原性优良的零价铁,试验结合金属修饰与固体负载的两种改良方法,采用电沉积法制备活性炭负载型镍铁双金属颗粒(Ni/Fe-AC BPs)。通过场发射扫描电镜(FESEM)、能谱图(EDS)、比表面积分析仪(BET)进行表征,并以六价铬去除率为其性能评价指标。单因素制备试验结果表明:最优沉积液配比为硫酸铁400g/L,硫酸镍80g/L,硼酸40g/L,硫酸锰60g/L;最佳电沉积条件为电流密度0.45A/cm2,温度40℃,电沉积10min,此条件下,六价铬去除率高达100%。FESEM、EDS及XRD证实了镍铁双金属颗粒制备成功,且所制材料呈絮球状,分散均匀;BET及AC、Fe-AC、Ni/Fe-AC BPs除铬对比试验表明,Ni/Fe-AC BPs的比表面积较AC小47.60%,但除Cr(Ⅵ)率高达100.00%,而AC吸附率仅5.43%。因此,Ni/Fe-AC BPs具有良好的催化还原性能。

To prepare zero-valent iron with excellent adsorptive and reducible properties,activated carbon was used in this experiment as a load,and modified with metal modification to obtain activated carbonsupported Ni/Fe bimetallic particles by electro-deposition.Ni/Fe-AC BPs were characterized by FESEM,EDS,and BET analyzer,and the Cr(Ⅵ)removal rate was used as the performance evaluation index.The results of single factor preparation test showed that the optimum deposition solution ratio was ferric sulfate400 g/L,nickel sulfate 80 g/L,boric acid 40 g/L and manganese sulfate 60 g/L.The optimum electro-deposition conditions were current density 0.45 A/cm2,temperature 40 ℃ and electrodeposition10 min.Under these conditions,the removal rate of hexavalent chromium was as high as 100%.FESEM,EDS and XRD confirmed that the preparation of nickel-iron bimetallic particles was successful,and the prepared materials were flocculent and uniformly dispersed.The comparison tests of BET and AC,Fe-AC,Ni/Fe-AC BPs for chromium removal showed that the specific surface area of Ni/Fe-AC BPs was 47.6%smaller than AC,but the removal rate of Cr(VI)was 100%,while the adsorption rate of AC was only5.43%.Therefore,Ni/Fe-AC BPs have a good catalytic reduction performance.