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首页> 外文会议>International Meeting of the International Humic Substances Society >Utilizing Visible-light TiO2/Adsorbent Nanocomposite for Humic Acids Removal in Wastewater
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Utilizing Visible-light TiO2/Adsorbent Nanocomposite for Humic Acids Removal in Wastewater

机译：利用可见光TiO2 /吸附剂纳米复合物用于废水中的腐殖酸去除

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Recently, development of TiO2/adsorbent nanocomposite (TNC) has become a strong candidate for dissolved organic compounds (DOC) removal in wastewater [1]. This could reportedly combine the advantages of both adsorption and photocatalytic techniques [2,-5]. On one hand, large surface-area adsorbents work as the support of nano-sized TiO2 photocatalyst and concentrate the pollutants and intermediates around the TiO2, of which photodecomposition rate is intrinsically low due to their limited surface area; on the other hand, the nanosized photocatalyst can decompose the pollutants thus regenerating the adsorbents in situ. However, it is well known that the band gap energy of TiO2 is intrinsically wide between 3.0 and 3.2eV (3.0 for rutile and 3.2 for anatase). This means plain TiO2 semiconductors only absorbs a small portion (5%) of solar spectrum in the UV region. Previous literature studies have demonstrated that wet chemical N-doping could enable the visible light activity of nano-sized TiO2 photocatalysts [6]. Our preliminary results determined that the optimal wet chemical preparation conditions are obtained at equal N-to-Ti molecular ratio of precursors (triethylamine and titanium butoxide) and 350o C calcinations. Consequently, coating visible-light sensitive TiO2 photocatalysts on the surface of porous adsorbents within the same wet chemical procedure are carried out in current work. Zeolite adsorbent (F-9 from Tosoh, Japan) was used as the porous substrates. As-prepared TNC was assessed by aqueous humic acid (HA) removal, which exists widely as contaminants in Australian reservoir before proper treatments.
机译：最近，TiO 2 /吸附剂纳米复合材料（TNC）的发展已成为废水中溶解的有机化合物（DOC）除去的强烈候选物[1]。据报道，这可以结合吸附和光催化技术的优点[2，-5]。一方面，大型表面积吸附剂作为纳米大小的TiO2光催化剂的载体，并浓缩污染物和TiO 2周围的中间体，其中光学分解速度由于其有限的表面积而言是本质上的;另一方面，纳米化光催化剂可以分解污染物，从而原位再生吸附剂。然而，众所周知，TiO2的带间隙能量在3.0至3.2ev（3.0用于锐钛矿的3.0和3.2之间的内在宽。这意味着普通的TiO2半导体仅吸收UV区域中的小部分（5％）太阳光谱。以前的文献研究表明，湿化学N-掺杂可以使纳米大小的TiO2光催化剂的可见光活性[6]。我们的初步结果确定了最佳湿化学制备条件以等于前体（三乙胺和丁二烷酮）和350℃煅烧的等于N-TO-Ti的分子比。因此，在相同湿化学过程中涂覆在多孔吸附剂表面上的可见光敏感TiO2光催化剂在当前的工作中进行。沸石吸附剂（来自陶诺，日本的F-9）用作多孔基材。通过腐殖酸水溶液（HA）去除评估，如制备的TNC，在适当的治疗之前，澳大利亚水库的污染物存在广泛。

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