| 摘要: | 本研究嘗試結合高壓蒸氣技術(控制蒸氣壓力0.9 MPa、蒸氣溫度190 °C、反應時間8小時)及奈米二氧化鈦塗層技術，評估漿紙污泥?燒灰製備為輕質化光觸媒催化材料之可行性。為驗證光觸媒催化之功能特性，除進行材料之特性分析外，並以模擬空氣淨化試驗，評估其去除甲苯之能力。輕質化材料試驗結果顯示，在鈣矽比(CaO/SiO2)控制在1.11及調濕養護之條件下，材料特性除符合輕質化材料之體密度(1.07 g/cm3)及視孔隙率(57.13%)之要求外，材料之抗壓強度可達57 kg/cm2以上，符合相關高壓蒸氣養護輕質氣泡混凝土之產品規範。光觸媒材料之主要晶相，係以鈣矽水合物(C-S-H)、方解石(Calcite, CaCO3)、勃姆石(Boehmite, AlO(OH))及矽酸鈣(Ca2SiO4)等為主。空氣淨化試驗結果顯示，相較於未塗佈TiO2之材料，塗佈0.5%、1.0%及1.5% TiO2之光觸媒材料，具較佳之光催化活性，其中尤以1.0% TiO2之光觸媒材料，具最佳之光催化活性及耐久性，就CO2礦化率而言，可達81.88%，然經五次重複試驗後，礦化率降低至3.59%。本研究以漿紙污泥?燒灰製備輕質化材料，於表面塗佈二氧化鈦後，初步驗證可藉由光催化特性將甲苯轉換為二氧化碳。整體而言，本研究雖具後續應用發展之潛力，然未來仍需進一步探討與評估甲苯之去除反應機制，以釐清自製輕質化光觸媒催化材料之應用可行性。
;This study investigates the characterization of air-purifying photocatalyst lightweight material manufactured by paper mill sludge calcined ash by combination of autoclaving technique (steam pressure 0.9 MPa, steam temperature 190 °C, and reaction time 8 hours) and nano-titanium dioxide (TiO2) coating technology. In order to evaluate the catalytic ability of prepared air-purifying photocatalyst, the toluene removal experiments were also conducted.
In the case of CaO/SiO2 ratio 1.11 and curing by humidity control, the experimental results indicated that the lightweight material has not only met the criteria of relevant autoclaving lightweight material with bulk density (1.07 g/cm3) and apparent porosity (57.13%), but also has the good performance of compressive strength (higher than 57 kg/cm2).The mainly crystal phases of the lightweight material were identified by XRD including calcium silicon hydrate (C-S-H), Calcite(CaCO3), Boehmite(AlO(OH)), and Ca2SiO4. According to the analysis results of the air purification test, the prepared catalysts containing 0.5%, 1.0%, and 1.5% TiO2 have a good photocatalytic characteristics. Especially for 1.0% TiO2 air-purifying photocatalyst, it presents the best photocatalytic activity with corresponding to 81.88% of CO2 mineralization rate. On the other hand, the prepared catalyst durability seems not to be good enough. After five cycles, the CO2 mineralization rate was decreased to 3.59%. In this study, the prepared air-purifying photocatalyst could provide the good photocatalytic characteristics to convert toluene into CO2. Although the prepared air-purifying photocatalyst have a good potential for application; however, to clarify the long-term application and market development of air-purifying photocatalyst lightweight material, it is necessary to further discuss and evaluate the toluene removal mechanism in the future. |
