近期還原氧化鎢及其複合材料因它獨特的物化性和可調式結構在奈米科技引起廣大的討論。因此，在此篇研究中我們利用還原氧化鎢(WO2.72)作為光催化的材料，並能應用於全光譜染料降解及六價鎘(Cr 6+)還原。
在第一部分中，我們製備出高效率的光催化奈米複合材料(Ag3VO4/WO2.72)並在紫外光(UV)、可見光(Vis)、近紅外光(NIR)及太陽光催化下成功降解有機染料羅丹明 B (Rh B)及甲基藍 (MB)。其中Ag3VO4和WO2.72的莫爾比率為1:2 (AgV-WO-2)時有最佳光降解效率。AgV-WO-2在太陽光及可見光催化時，降解羅丹明 B和甲基藍效率可達99%及98%。在紫外光(UV)催化時，降解羅丹明 B和甲基藍效率可達96%及89%，而在近紅外光催化時分別是40%及38%。此外，我們也探討此光催化奈米複合材料對於還原六價鎘的能力。AgV-WO-2在太陽光的催化下，其六價鎘還原效率可達90%。在與其它的文獻相比之下，AgV-WO-2不管是在降解染料或是還原六價鎘都表現出更佳的結果，因此，此光催化奈米複合材料在去除羅丹明 B (Rh B)、甲基藍 (MB)和還原六價鎘(Cr 6+)上極具有的價值。
在第二部分中，我們將工業廢棄的三醋酸纖維素(rTAC)配置成溶液並混摻WO2.72/Fe3O4，最後利用靜電紡絲技術將三醋酸纖維素混摻WO2.72/Fe3O4材料電紡在聚乙烯醇(PVA)不織布上，形成具有光催化特性的雙面膜。在此篇論文中，我們探討了WO2.72/Fe3O4和雙面膜在太陽光催化下，對於有機染料甲基橘(MO)、羅丹明 B和甲基藍的降解及在紫外光、可見光和太陽光催化下，及對於還原六價鎘的能力。此雙面膜設計以聚乙烯醇親水的特性，驅動汙水更易穿透到三醋酸纖維(rTAC)層並使汙染物與光催化材料接觸而降解。從結果來看，WO2.72/Fe3O4奈米複合材料對於有機染料的降解及還原六價鎘(Cr 6+)都有相當好的成效。特別是WO-FO-0.5，其還原六價鎘的能力比Fe3O4出色許多，分別在太陽光、可見光(Vis)及紫外光(UV)催化時高出2.9、1.6及2.0倍。而在太陽光下降解羅丹明 B、甲基藍及甲基橘的能力也分別高出20、29.2及1.6倍。合成的雙面膜對於降解羅丹明 B和甲基藍及還原六價鎘也展現出良好的光催化特性、穩定性和可重複利用性。在20 ppm的甲基藍及20 ppm的羅丹明 B中，其光催化效率分別達到接近100%及50%。而在50 ppm的六價鎘中也能達到80 %的還原效率。因此，此可重複回收使用之雙面膜在環境除汙的應用上具有相當大的潛力。

Recently, reduced tungsten oxides and their composites has got huge attention in the development of nanotechnology because of their merits such as; high tunable structure and owing unique physicochemical properties. Herein, the dissertation highlights reduced tungsten oxides (WO2.72) materials for photocatalytic activities for degradation of organic dye pollutants from ultraviolet to near infrared and Photocatalytic reduction of Chromium (VI) and organic pollutants under UV, Visible and Solar light.
In the first section we have reported preparation of highly efficient photocatalyst Ag3VO4/WO2.72 nanocomposites. The photocatalytic performances of the prepared nanocomposites towards photodegradation of organic dyes Rhodamine B (Rh B) and Methylene Blue (MB) were studied. The Ag3VO4/WO2.72 nanocomposites exhibited outstanding photocatalytic performance for the photodegradation of Rh B and MB, and they were stable under irradiation with UV, visible, near-infrared (NIR), and solar light. A nanocomposite prepared with Ag3VO4 and WO2.72 in a 1:2 molar ratios (AgV-WO-2) exhibited particularly high photodegradation efficiency. AgV-WO-2 photodegraded 99% of the Rh B and 98% of the MB in aqueous solutions under solar and visible light. Under UV light, 96% of the Rh B and 89% of the MB were degraded, while 40% of the Rh B and 38% of the MB in solutions irradiated with NIR light were removed. The photocatalytic performance of the nanocomposites for the photo reduction of chromium (VI) was also studied. AgV-WO-2 exhibited a photo reduction efficiency of 90% under solar light irradiation. The photocatalytic activities of the AgV-WO-2 nanocomposites were better than other reported catalysts for the photodegradation of Rh B and the photo reduction of Cr (VI). It is thus a promising photocatalyst for the removal of Rh B, MB, and chromium (VI).
In the second section, recyclable Janus membrane was prepared from industrial waste triacetate cellulose (TAC) by solution electro spinning. Recycled TAC (rTAC) and poly vinyl alcohol (PVA) were used as the host matrix and substrate with WO2.72/Fe3O4 nanocomposite. The photocatalytic property of WO2.72/Fe3O4 nanocomposite towards photodegradation of organic dyes such as methyl orange (MO), Rhodamine B (Rh B), and methylene blue (MB) under solar light irradiation as well as photocatalytic reduction of Cr(VI) under UV, Visible and Solar light were studied. The photocatalytic performance of recyclable Janus membrane for photocatalytic reduction of Cr(VI) and photodegradation of MB and Rh B were also investigated. The recyclable Janus membrane were intentionally designed so that the contaminated water can easily come into contact with hydrophilic PVA and pass to porous rTAC where the pollutant and the photocatalyst meet and photocatalysis takes place. The result displayed that WO2.72/Fe3O4 nanocomposite exhibited excellent photocatalytic performance for photodegradation of MO, MB and Rh B dyes under solar light and photo reduction of Cr(VI) under UV, visible and solar light. Particularly, WO-FO-0.5 nanocomposite exhibited 2.9, 1.6, and 2.0 times for Cr(VI) photo reduction under solar, visible, and UV and 20, 29.2 and 1.6 times that of Fe3O4, for Rh B, MB and MO under solar light. The synthesized recyclable Janus membrane exhibited outstanding photocatalytic activity and stability for photodegradation of MB and Rh B dyes and photo reduction of Cr(VI). Photocatalysis efficiency of about 100% of 20 ppm MB, 50% of 20 ppm Rh B and 80% of 50 ppm Cr(VI) can be obtained by the recyclable Janus membrane and still it is stable after multiple cycle. Therefore, the recyclable Janus membrane is promising candidate for environmental remediation under solar light irradiation.

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