摘要
通过高温真空烧结法和水热反应法成功制备了表面负载有二氧化钛纳米线的开孔泡沫钛镍合金电极.多孔钛镍合金的烧结温度为1473 K,时间为2 h;水热反应温度为373 K,反应时间为16 h.利用X射线粉末衍射分析(XRD)和扫描电镜(SEM)对负载二氧化钛纳米线开孔泡沫钛镍合金进行了表征.将该泡沫电极作为阳极,泡沫镍为阴极组成串联水处理装置,并利用甲基橙溶液研究了该装置电解净化污水的能力.利用紫外-分光光度法研究了不同阳极电压下钛镍合金对甲基橙的分解能力.研究表明,在阳极氧化电压大于30 V的条件下,甲基橙溶液以200 mL/min的流速一次性流经该装置便可使甲基橙的脱色率达90%以上.
Porous Ti-Ni alloy was prepared by dipping method and vacuum sintering. Glue and Ti-Ni powders （95 wt% Ti＋5 wt% Ni） were mixed together to get a slurry. Then a piece of open cell polymer foam （20 mm×20 mm×2 mm） was dipped into the slurry. After being stirred in the slurry for 1 h, the polymer foam was pulled out and squeezed to remove extra slurry. The polymer foam loaded with Ti-Ni slurry was sintered at 1473 K in vacuum for 2 h. With the decomposition of polymer foam at high temperature, an open cell porous Ti-Ni alloy with pore diameter about 0.2 mm was obtained. Because of the addition of Ni powders, porous Ti-Ni alloy has obvious metal luster. A hydrothermal process was applied for TiO2 nanowires preparation. 5 g of porous Ti-Ni alloy was placed in 20 mL H2O2 （30%） aqueous solution at 373 K for 16 h. Then the porous Ti-Ni alloy was filtered out and washed with deionized water. After being dried at 373 K for 6 h, TiO2 nanowires-loaded porous Ti-Ni alloy （TWP-alloy） was obtained. Then the TWP-alloy was characterized by X-ray diffraction and scanning electron microscope. The length of TiO2 nanowires on the surface of Ti-Ni porous alloy was about 2 μm and the diameter of the nanowires was about 20 nm. In the XRD pattern of TWP-alloy, the major phase was Ti and minor phase was TiNi. After being heat-treated at 723 K for 4 h, the phase of the TiO2 nanowires coated on porous Ti-Ni alloy was changed into rutile. During the heat-treatment from 298 K to 723 K, no anatase phase was observed. This means the formation of anatase phase was blocked by the dimension effect of TiO2 nanowires. Then a kind of streaming wastewater treatment instrument was assembled by using TWP-alloy as anode and porous Ni as cathode. Methyl orange solution was taken as a sample to investigate the wastewater processing efficiency of TWP-alloy. Under the anode voltage of 30 V, the discoloration of methyl orange can get 93% under the flow velocity of 200 mL/min.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2013年第6期947-950,共4页
Acta Chimica Sinica
基金
中央高校基本科研业务费专项资金(No.2009SD-26)
北师大测试基金(C10)资助~~
