高比面積氯化銀的製造暨染料降解與殺菌研究

Study on the manufacture of high specific area silver chloride and dye degradation and sterilization

翁建華(Jian-Hua Weng)

指導教授 ： 林清彬

淡江大學/工學院/機械與機電工程學系碩士班/碩士(2019年)

https://doi.org/10.6846/TKU.2019.00900

摘要

染料廢水若直接排入到河流和湖泊，將會嚴重污染人們的使用水和農田土壤用水。此外，最常見的飲用水消毒方法是添加氯或氯副產物，儘管這些氯化物質具有顯著的消毒效果，但是消毒後的飲用水通常會有不好的味道和氣味，並且會產生潛在致癌的毒性或誘變產物，例如三鹵甲烷和氯仿。因此本研究進一步提出了一種新穎的高表面積多孔SiC-AgCl/Ag0光催化劑的製造方法，並測試該光催化劑對Orange II偶氮染料降解和環境型大腸桿菌殺菌的效果及其耐久性。多孔性光催化劑系將表面潔靜90％孔隙率的碳化矽浸入液氮中後取出並立即浸泡在8.4M硝酸銀中10秒鐘，此時固態的硝酸銀會均勻塗覆在多孔性碳化矽的骨架表面，接著將樣品浸泡在4M鹽酸溶液中，此時肋骨表面會以非均質析出氯化銀，然後將樣品在200℃加熱8小時，用以增強氯化銀和碳化矽肋骨的接著性。SEM觀察顯示奈米級針狀晶體氯化銀在碳化矽的肋骨呈現均勻交錯堆疊。光觸媒在UV光照射後，藉由XRD分析，在該光觸媒產生灰黑色銀原子簇。在可見光和UV光照射下進行Orange II偶氮染料的降解，發現濃度降解動力學遵循一級反應。此外，這種降解偶氮染料的光催化效果在經過4個循環後仍96％的降解效果。另外，環境型大腸桿菌的滅菌可在50分鐘內完成，其降解動力學也遵循一級反應。本研究製得的高表面積多孔SiC-AgCl/Ag0光催化劑不僅降低使用過多高成本的硝酸銀外，而且提高了水中污染物降解及殺菌效果且具有較高的使用可靠度。

關鍵字

氯化銀 ； 光觸媒 ； 大腸桿菌 ； 降解 ； 消毒 ； 可靠度

並列摘要

The dye wastewater is directly discharged into rivers and lakes, it will seriously pollute people's water and the soil of the farmland. In addition, the most common disinfection method for drinking water is to add chlorine or chlorine by-products. Although this chlorination has a significant disinfecting effect, drinking water often has a bad taste and smell and will produces potentially toxic or mutagenic products such as trihalomethanes and chloroform, which may be sources of carcinogenesis, so this study further proposes an innovative procedure of producing highly porous SiC-AgCl/Ag0 photocatalyst and tested for durability and degradability of abiotic material (azo dye, Orange II) and biotic material (bacterial, E. coli). Porous photocatalyst were made by 90% porosity silicon carbide in liquid nitrogen, emerging the specimen in 8.4 M silver nitrate for 10 seconds and the solidified silver nitrate were coated on the backbone of silicon carbide. And, the specimen was emerged in 4M hydrochloride solution for precipitated out the non-homogeneous phase silver chloride on the surface of the backbone. SEM shows the needle-like nano sized crystal silver chloride was homogeneously crosslink on the silicon carbide backbone. Later on the specimen were heated at 200℃ for 8 hours to enhance the adhesion of silver chloride and silicon carbide backbone. Through the XRD analysis under the condition of UV light irradiation, grey-black silver was generated on this porous material. Degradation of azo dye was performed under visible and UV light irradiation and the concentration degradation kinetics follow the first order reaction. Furthermore, the degradability of this photocatalyst which degrades azo dye could persist at least 4 cycles been used in our experiment with 96% degradability. Sterilization of E. coli could be completed in 50 minutes and the degradation kinetics follows the first order reaction as well. The photocatalyst produced in this work not only reduced the cost of consuming too much silver nitrate, but increase the reliability and degradability of contaminant in the water.

並列關鍵字

silver chloride ； photocatalyst ； Degradation ； Sterilization ； reliability

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