Photocatalytic process optimization study of vanadium and nitrogen co-doped Ti-bearing blast furnace slag
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摘要: 为了实现含钛高炉渣的高附加值、合理的综合利用问题，利用其含TiO2可制备光催化剂的特点，以攀钢含钛高炉渣为原料，以硝酸铵为氮源，以偏钒酸铵为钒源，采用高温固相烧结法掺入钒源，液相法掺入氮源的分步掺杂的方式制备了钒-氮共掺杂含钛高炉渣光催化材料，在紫外光下，以亚甲基蓝为模拟污染物，选取掺杂量、煅烧温度及煅烧时间为影响因素，评价其光催化活性；并用SEM、XRD手段对催化剂进行了表征。结果表明：钒、氮共掺杂对高炉渣的物相晶型影响较小，但能够增大其比表面积，提高其光催化活性；在煅烧温度300 ℃、N-Ti摩尔掺杂比30%、偏钒酸铵-TiO2质量百分比45%、煅烧时间2 h时，制备的钒-氮共掺杂含钛高炉渣光催化剂降解率达到97.0%，比未掺杂之前提高了47.0%。Abstract: The characteristics of the photocatalysts can be prepared using Ti-bearing blast furnace slag containing TiO2 to realize Ti-bearing blast furnace slag′s high added value and reasonable comprehensive utilization. Photocatalytic material derived from vanadium and nitrogen co-doped Ti-bearing blast furnace slag was produced by two-step doping approach (high-temperature solid-phase sintering method was used to adulterate vanadium source and liquid-phase method was used to adulterate nitrogen source). The raw material was Ti-bearing blast furnace slag produced from Pangang. At the same time, ammonium nitrate and ammonium metavanadate were carried out as the nitrogen source and the vanadium source, respectively. The effects of calcination temperature, doping amount and calcination time on the degradation rate of simulated pollutant methylene blue solution were investigated under ultraviolet light, and SEM and XRD characterized the photocatalytic activity. The results show that the co-doping of vanadium and nitrogen has a negligible effect on the crystal structure of blast furnace slag but can increase the specific surface area of blast furnace slag and improve its photocatalytic activity. The N/Ti molar ratio is 30% and the mass percentage of ammonium metavanadate TiO2 was 45% when the calcination temperature was 300 ℃. In addition, the degradation rate of the prepared vanadium and nitrogen co-doped Ti-bearing blast furnace slag photocatalyst reached 97.0% when the calcination time was 2 h, which was 47.0% higher than that before doping.
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图 1 高炉渣及光催化剂的SEM形貌
Figure 1. SEM patterns of the blast furnace slag and photocatalysts
图 3 煅烧温度对光催化剂降解效率的影响
Figure 3. Effect of calcination temperature on the degradation efficiency of the photocatalyst
图 4 不同煅烧温度下降解率随时间的变化
Figure 4. Variation of degradation rate with time at different calcination temperature
图 5 掺杂量对光催化剂降解效率的影响
Figure 5. Effect of doping ratio on degradation efficiency of the photocatalyst
图 6 不同掺杂量下降解率随时间的变化
Figure 6. The change of degradation rate with time in different doping amount
图 7 煅烧时间对光催化剂降解效率的影响
Figure 7. Effect of calcination time on degradation efficiency of the photocatalyst
图 8 不同煅烧时间下降解率随时间的变化
Figure 8. The change of degradation rate with different calcination times
表 1 含钛高炉渣的主要成分
Table 1. Main compositions of the Ti-bearing blast furnace slag
% TiO2 Fe2O3 SiO2 MgO Al2O3 CaO V2O5 F 23.16 2.64 24.01 7.47 13.49 27.19 0.82 0.12 
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