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以羧甲基纤维素钠(CMC)作为稳定剂,优化了制备条件,在反应温度25℃,m(CMC)/m(Fe)=5以及m(Ni)/m(Fe)=0.03的条件下成功制备了CMC-Ni/Fe纳米双金属颗粒。用制得的CMC-Ni/Fe纳米双金属颗粒于30℃下降解5 mg/L的PCB77溶液48 h,当双金属颗粒用量为3 g/L时,有高达94%的PCB77被降解,而没有加入CMC的Ni/Fe双金属体系只有71%的PCB77被降解。CMC-Ni/Fe纳米双金属颗粒经XRD检测,表现出明显的单质铁特征峰,且无铁氧化物特征峰,表明制备所得的纳米颗粒中的铁单质没有被氧化。经粒度分析仪的检测,CMC-Ni-Fe双金属纳米颗粒平均粒径在23.94 nm,明显小于没有加CMC的Ni/Fe双金属颗粒粒径(100 nm)。
The conditions for the preparation were optimized with sodium carboxymethyl cellulose (CMC) as stabilizer and m (CMC) / m (Fe) = 5 and m (Ni) / m Under the successful preparation of CMC-Ni / Fe nano-bimetallic particles. With the prepared CMC-Ni / Fe nano-bimetallic particles degrading 5 mg / L PCB77 solution for 48 h at 30 ℃, up to 94% of PCB77 was degraded when the amount of bimetallic particles was 3 g / L, Only 71% of PCB77 was degraded in the Ni / Fe bimetallic system without CMC addition. The XRD patterns of CMC-Ni / Fe nano-bimetallic particles show obvious peaks of elemental iron with no characteristic peaks of iron oxide, indicating that the iron in the prepared nano-particles is not oxidized. The average size of CMC-Ni-Fe bimetallic nanoparticles at 23.94 nm was significantly smaller than that of Ni / Fe bimetallic particles without CMC (100 nm) by particle size analyzer.