(1. 東北大學秦皇島分校 資源與材料學院，秦皇島066004；
2. 東北大學 冶金資源與生態(tài)環(huán)境研究所，沈陽 110819；
3. 東北大學 遼寧省冶金資源循環(huán)科學重點實驗室，沈陽 110819；
4. 東北大學 遼寧省硼資源綜合利用工程技術(shù)研究中心，沈陽 110819；
5. 東北大學 硼資源生態(tài)化利用技術(shù)與硼材料遼寧省高校重點實驗室，沈陽 110819)
摘 要: 以低濃度硫酸、高鈦渣為原料，采用高能球磨復合水熱法，在不同酸浸濃度下合成高鈦酸浸渣(ALHTS)光催化劑。利用X射線熒光光譜(XRF)、X射線衍射(XRD)、傅立葉紅外(FTIR)、掃描電鏡(SEM)、氮氣吸附-脫附等溫線、差熱-熱重(TG-DTA)、紫外可見漫反射光譜(DRS)和光致發(fā)光譜(PL)分析等對ALHTS催化劑的結(jié)構(gòu)和性能進行分析和表征。在不同酸浸濃度下，通過甲基橙的脫色率來評價ALHTS催化劑的光催化活性。結(jié)果表明： 當酸浸濃度為20%時，由于鈣鈦礦含量較高，ALHTS催化劑的硫酸鈣含量較低，BET的比表面積最大，在紫 外-可見區(qū)域的光吸收能力最大，電子-空穴對具有較低的再復合率。因此，ALHTS催化劑有較高的光催化活性。采用汞燈光照30 min，不調(diào)pH時甲基橙廢水脫色率達到87.03%。
關(guān)鍵字: 高鈦渣；水熱合成；酸浸；光催化氧化；甲基橙
（1. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China;
2. Institute of Metallurgical Resource and Environmental Engineering, Northeastern University, Shenyang 110819, China;
3. Liaoning Key Laboratory of Metallurgical Resource Recycling Science, Northeastern University, Shenyang 110819, China;
4. Liaoning Engineering and Technology Research Center of Boron Resource Comprehensive Utilization,
Northeastern University, Shenyang 110819, China;
5. Liaoning Provincial Universities Key Laboratory of Boron Resource Ecological Utilization Technology and
Boron Materials, Northeastern University, Shenyang 110819, China）
Abstract:Acid leaching of high titanium slag (ALHTS) photocatalysts under different acid concentrations were prepared by the high energy ball milling method combining with hydrothermal method using high titanium slag and dilute sulphuric acid as the starting materials. The structure and performance of ALHTS photocatalysts were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), N2 adsorption-desorption isotherms, TG-DTA, diffuse reflectance spectrophotometry (DRS) and photoluminescence (PL) methods. The photocatalytic activity of ALHTS photocatalysts under different acid concentrations was checked by the photocatalytic oxidation of methyl orange as a model compound under UV-vis light irradiation. The results show that, ALHTS catalysts acid leached by 20% sulphuric acid exhibit the highest photocatalytic activity, which can be attributed to the synergic effect of higher content of perovskite, the largest BET specific surface area and UV-visible absorption capacity, and the lower recombination rate of the electron-hole pairs. The decoloration rate of methyl orange without adjusting pH reaches 87.3% under mercury lamp irradiation for 30 min.
Key words: high titanium slag; hydro-thermal synthesis; acid leaching; photocatalytic oxidation; methyl orange
