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Facile template-free synthesis of new α-MnO2 nanorod/silver iodide p–n junction nanocomposites with high photocatalytic performance
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-04-06 , DOI: 10.1039/d0nj01033b Hadi Salari 1, 2, 3, 4, 5 , Mona Kohantorabi 1, 5, 6, 7
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-04-06 , DOI: 10.1039/d0nj01033b Hadi Salari 1, 2, 3, 4, 5 , Mona Kohantorabi 1, 5, 6, 7
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In the present study, a novel α-MnO2/AgI photocatalyst was successfully fabricated by using hydrothermal/precipitation methods, and its photocatalytic performance was evaluated from the degradation of Acid blue 92 (AB92) dye under visible light irradiation. The surface and crystalline structure, morphology, and electro-chemical properties of the as-made photocatalyst were investigated by BET, XRD, XPS, SEM-EDS, TEM, DRS, PL, PC, and Raman analysis. The optimized nanocomposite (α-MnO2/AgI) with a weight ratio of 1 : 15 showed the best photocatalytic activity in the decomposition of AB92 with a removal efficiency of 100% in 40 min which was better than that of pure α-MnO2 (48%) and AgI (61%), confirming the synergistic effect in the as-prepared photocatalyst. The high photocatalytic activity of the nanocomposite is attributed to the high activity of AgI nanoparticles and the heterojunction between α-MnO2 and AgI which can enhance light adsorption and the photo-generation of electron–hole (e−/h+) pairs. The effect of experimental parameters including initial solution pH, catalyst dosage, and concentration of dye was studied in the degradation reaction, and the results obtained indicated that in acidic media (pH = 4) when the catalyst dosage and dye concentration were 300 mg L−1 and 10 mg L−1, respectively, high activity was observed. Also, the reactive species trapping experiments were applied for investigation of the decomposition mechanism. Based on the results, the holes (h+) and superoxide radicals (O2˙−) that are generated play a vital role in the photo-degradation process, while hydroxyl radicals (HO˙) showed a lower effect. The α-MnO2/AgI nanocomposite exhibited high recyclability in four consecutive photocatalytic runs without losing the activity.
中文翻译：
无需模板即可轻松合成具有高光催化性能的新型α-MnO2纳米棒/碘化银p-n结纳米复合材料
在本研究中，一种新颖的α-MnO的2 /碘化银光催化剂成功地通过使用水热/沉淀方法制造，和光催化性能是由酸的降解蓝92（AB92）可见光照射下染料评估。通过BET，XRD，XPS，SEM-EDS，TEM，DRS，PL，PC和拉曼分析研究了制成的光催化剂的表面和晶体结构，形态和电化学性能。优化的纳米复合材料（α-MnO的2 / AGI）以1:1的重量比：15显示，AB92的分解的光催化活性最好为100％，在40分钟去除效率明显高于纯α-的MnO更好2（48％）和AgI（61％），证实了所制备光催化剂具有协同作用。纳米复合材料的高的光催化活性是归因于碘化银纳米粒子的高活性和α-MnO的之间的异质结2和碘化银这可以增强光吸收和光产生的电子-空穴的（E - /小时+）对。研究了初始溶液pH，催化剂用量和染料浓度等实验参数对降解反应的影响，结果表明，在酸性介质（pH = 4）下，催化剂用量和染料浓度为300 mg L-时， 1和10 mg L -1分别观察到高活性。此外，反应性物种捕获实验被用于研究分解机理。基于这些结果，该空穴（h +）和超氧自由基（O 2 ˙ - ），其生成播放在光降解过程中的重要作用，而羟基自由基（HO）显示较低的效果。α-的MnO 2 /纳米复合材料的AgI在四个连续的光催化运行显示出高的可回收性而不会失去活性。
更新日期：2020-04-06
中文翻译：
无需模板即可轻松合成具有高光催化性能的新型α-MnO2纳米棒/碘化银p-n结纳米复合材料
在本研究中，一种新颖的α-MnO的2 /碘化银光催化剂成功地通过使用水热/沉淀方法制造，和光催化性能是由酸的降解蓝92（AB92）可见光照射下染料评估。通过BET，XRD，XPS，SEM-EDS，TEM，DRS，PL，PC和拉曼分析研究了制成的光催化剂的表面和晶体结构，形态和电化学性能。优化的纳米复合材料（α-MnO的2 / AGI）以1:1的重量比：15显示，AB92的分解的光催化活性最好为100％，在40分钟去除效率明显高于纯α-的MnO更好2（48％）和AgI（61％），证实了所制备光催化剂具有协同作用。纳米复合材料的高的光催化活性是归因于碘化银纳米粒子的高活性和α-MnO的之间的异质结2和碘化银这可以增强光吸收和光产生的电子-空穴的（E - /小时+）对。研究了初始溶液pH，催化剂用量和染料浓度等实验参数对降解反应的影响，结果表明，在酸性介质（pH = 4）下，催化剂用量和染料浓度为300 mg L-时， 1和10 mg L -1分别观察到高活性。此外，反应性物种捕获实验被用于研究分解机理。基于这些结果，该空穴（h +）和超氧自由基（O 2 ˙ - ），其生成播放在光降解过程中的重要作用，而羟基自由基（HO）显示较低的效果。α-的MnO 2 /纳米复合材料的AgI在四个连续的光催化运行显示出高的可回收性而不会失去活性。
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