從電鍍、皮革、印染和製造業所產生的六價鉻排放到環境中，由於其高毒性而對人類造成嚴重的健康問題，還有其他有無毒物質如有機染料和非染料也同樣會導致健康問題。這些污染物由於它們影響了生態和環境，因此為了有效地處理它們，我們使用了新型光催化劑還原或氧化使其毒性較小或無毒。
在第一項工作中，我們的目的是有效地以光催化還原廢水中的劇毒六價鉻汙染物。在此我們利用簡易的低溫方法製備了具有不同銦前驅物含量之銦摻雜Zn(O,S)奈米顆粒，以還原高毒性的Cr(VI)，並以不同的檢測方式測定其性能。其中含有5摩爾百分比的銦前驅物的ZnInOS-5在光照射後，在3分鐘內還原了99.9％的Cr(VI)。ZnInOS-5還原Cr(VI)的速度是無摻雜之ZnInOS-0的46倍。In摻雜Zn(O,S)之光催化活性的增強可以歸因於其粒徑小，電荷轉移電阻低以及光生空穴和電子的複合率低。由於其卓越的性能，ZnInOS-5是光催化Cr(VI)降解的理想選擇。
在第二項工作中，透過簡易的室溫水解法在沒有任何有毒的沉澱化學物質和任何封端劑下成功地合成不同銦含量的In摻雜BiOBr。通過不同的檢測技術系統地分析了所有製備的光催化劑，並測試了它們對RhB的光催化降解。其中，In前驅物相對於In和Bi前驅物總量為15 mol.%的In-15-BiOBr顯示出最佳的光催化活性。In-15-BiOBr僅在15分鐘內即可完全降解10 mg / L RhB水溶液，其速度是純BiOBr的4.7倍。In摻雜所顯示的高度增強的光催化活性歸因於所製備的In摻雜的BiOBr光催化劑的較低的電荷轉移阻力和較高的電荷分離。我們將提出可能的In-15-BiOBr光催化降解RhB的機制。
在第三項工作中，已在室溫下製備了一系列不含模板的In摻雜BiOBrxI1-x固溶體納米片光催化劑，並通過各種方法對其進行了特徵分析。它完全降解了帶正電的甲基橙（MO），帶負電的羅丹明B（RhB）和亞甲基藍（MB）有機染料以及糠醛的中性和無色非染料有機化合物。平帶電位提供了將溶解的O2還原為導帶中O_2^(.-)可能性，而捕獲實驗發現 (O_2^(.-) ) 是主要的自由基種類，接著h +進行光降解。。結果表明，In-BiOBrI-0.4具有優異的光催化降解活性，這可能是由於金屬離子摻雜與固溶體形成之間的協同作用所致。如光學和光電化學研究所證實的，它進一步提高了可見光收集能力和光致電荷載流子分離效率。確定了反應速率的順序並提出了機理。這項工作可以為設計有效的光催化劑進行環境修復奠定基礎。

Toxic inorganic and organic pollutants are released to the environment from different industries. Hexavalent chromium that mainly discharged from electroplating, leather, dyeing, and manufacturing industries causes serious health problems to human beings due to its high toxicity. Other toxic pollutants discharged to the water bodies include organic dyes and non-dyes that can cause health problems. These inorganic and organic pollutants need to be either reduced or oxidized to make them less toxic or nontoxic. To effectively treat them, novel photocatalysts are employed due to their ecological and environmental influences.
In the first work, efficient photocatalytic reduction of highly toxic hexavalent chromium pollutants from wastewater was focused. Here, indium doped zinc oxysulfide nanoparticles with different indium precursor contents were prepared by a facile low-temperature method to reduce highly toxic Cr(VI). The as-prepared photocatalysts were characterized using different techniques. The photocatalytic activities of the as-prepared nanoparticles were evaluated by the photocatalytic reduction of Cr(VI). ZnInOS-5 with 5 molar percentage indium precursor performed 99.9% reduction of Cr(VI) within 3 minutes of light irradiation. The rate of Cr(VI) reduction by ZnInOS-5 was 46 times faster than In-free ZnInOS-0. The enhanced photocatalytic activities by In-doped Zn(O,S) were attributed to small particle size, low charge-transfer resistance, and low recombination rate of photo-generated holes and electrons. Due to its excellent performance, ZnInOS-5 is an ideal candidate for photocatalytic Cr(VI) detoxification.
On the second work, the In-doped BiOBr nanosheet was successfully synthesized with different amounts of indium by a simple room temperature hydrolysis method without any toxic precipitation chemicals and/or any capping agent. All the as-prepared photocatalysts were systematically characterized by using different techniques and tested for their photocatalytic degradation of RhB. All the In-doped photocatalysts showed enhanced photocatalytic activity under visible light irradiation. Among all, In-15-BiOBr with 15 mol.% In precursor relative to total In and Bi precursors showed the best photocatalytic activity. In-15-BiOBr completely degraded 10 mg/L RhB aqueous solution within only 15 minutes with a rate of 4.7 times faster than the pure BiOBr. The highly enhanced photocatalytic activity shown with In doping was ascribed to lower charge transfer resistance and high charge separation of the as-prepared In-doped BiOBr photocatalyst. A possible photocatalytic RhB degradation mechanism with In-15-BiOBr using visible light was proposed.
In the third work, a series of template free In-doped BiOBrxI1-x solid solution nanosheet photocatalysts have been prepared at room temperature and characterized by various methods. Complete degradation of positively charged methyl orange (MO), negatively charged Rhodamine B (RhB) and methylene blue (MB) organic dyes, and neutral and colorless non-dye organic compound of furfural was attained. The flat band potential offered the possibility of reduction of dissolved O2 to O_2^(.-) in the conduction band while the trapping experiment identified the (O_2^(.-) ) is the main radical species followed by h+ for the photodegradation. The result indicated In-BiOBrI-0.4 had an excellent photocatalytic degradation activity which could be due to the synergetic effect between metal ion doping and solid solution formation. It further promotes visible light-harvesting ability and photoinduced charge carrier separation efficiency as confirmed by the optical and photoelectrochemical investigations. The order of the reaction rate was determined and the mechanism was proposed. This work can lay a base for the design of effective photocatalyst toward environmental remediation.

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