埃洛石纳米管负载金属氧化物及其催化性能的研究

发布时间：2018-09-18 18:05

【摘要】：埃洛石纳米管(HNTs)是一种天然铝硅酸盐的中空管状纳米管,价格低廉,具有一定的长径比、天然纳米空间及内腔负载容积大等特点,适合作为纳米反应器,同时其比较大的外表面积和硅铝骨架结构,适合作为催化剂载体。本文以HNTs结构特征为研究对象,采用滴加灌装法在HNTs管腔内分别负载纳米氧化铜和氮掺杂纳米氧化锌颗粒,制得纳米氧化铜负载型催化剂(CuO/HNTs)和氮掺杂纳米氧化锌负载型催化剂(N-doped-ZnO/HNTs);采用反应釜气相沉积法在HNTs表面负载纳米二氧化钛颗粒,制备HNTs负载型纳米催化剂,分别研究了它们的催化性能。采用XRD、FI-IR、TGA、SEM、TEM、BET等表征手段研究了HNTs的结构和物理性质,结果表明本课题采用的国产HNTs的长度约为200-500 nm,外径约为50-70 nm,内径约为15-25 nm,比表面积为33.8 m2/g。经800℃煅烧3h后,HNTs的管状结构依然能保持完好,表明HNTs具有很好的热稳定性。在100℃下,经pH=1或13的溶液水热浸泡处理后,HNTs的管状结构依然完好,说明HNTs具有良好的耐酸碱性。以HNTs的中空管状结构为模板,采用滴加灌装法分别制得纳米氧化铜负载型催化剂(CuO/HNTs)和氮掺杂纳米氧化锌负载型催化剂(N-doped-ZnO/HNTs)。运用XRD、FT-IR、 Uv-vis、SEM、TEM、EDX等表征手段对CuO/HNTs、N-doped-ZnO/HNTs进行了分析表征,结果表明,纳米氧化铜、纳米氧化锌颗粒成功负载到了HNTs管腔内,且ZnO中氮元素的原子摩尔百分含量为1.2%。研究了CuO/HNTs在环己烯环氧化为2-环己烯酮反应中的催化性能,结果表明,CuO/HNTs的转化率大于99%,选择性可达98%。研究了N-doped-ZnO/HNTs在模拟太阳光下,光催化降解甲基橙的光催化性能,结果表明,在光照120 min后,N-doped-ZnO/HNTs对甲基橙的去除率为70%。以HNTs表面为模板,采用反应釜气相沉积法负载氮掺杂纳米二氧化钛。运用XRD、 FI-IR、Uv-vis、SEM、TEM、EDX等表征手段对N-doped-TiO2/HNTs表征分析,结果表明,在HNTs表面成功负载了氮掺杂纳米二氧化钛,研磨和滴加两种方式下制备的Ti02氮的原子摩尔百分含量分别为2.3%、4.1%,钛的原子百分含量分别为2.43%、6.52%。研究了其在模拟太阳光下,光催化降解甲基橙和苯酚的光催化性能。结果表明,采用研磨方式和滴加方式制备的N-doped-TiO2/HNTs催化剂,氮的相对含量分别为0.45%、2.09%。光照300 min后,对甲基橙的去除率分别为8.55%、9.82%；光照150 mmin后,对苯酚的去除率分别为40.38%、74.42%。
[Abstract]:(HNTs) is a kind of natural aluminosilicate hollow tubular nanotubes, which has the advantages of low cost, certain aspect ratio, large loading volume of natural nano-space and inner cavity, and so on, so it is suitable for nanoreactor. At the same time, it is suitable to be used as catalyst carrier because of its large surface area and Si-Al skeleton structure. In this paper, the structural characteristics of HNTs were studied, and the nano-copper oxide and nitrogen-doped nano-zinc oxide particles were loaded in the HNTs tube cavity by drip filling method, respectively. Nano-CuO supported catalysts (CuO/HNTs) and nitrogen-doped nano-ZnO supported catalysts (N-doped-ZnO/HNTs) were prepared, and HNTs supported nano-catalysts were prepared by vapor deposition method on the surface of HNTs. Their catalytic properties were studied. The structure and physical properties of HNTs were studied by means of XRD,FI-IR,TGA,SEM,TEM,BET and other characterization methods. The results show that the length of domestic HNTs is about 200-500 nm, outer diameter is about 50-70 nm, inner diameter is 15-25 nm, specific surface area is 33.8 m2 / g. After calcined at 800 鈩，

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