School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, 523808, PR China; Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313000, China.
Dongguan Institute of Science and Technology Innovation, Dongguan University of Technology, Dongguan 523808, China; School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China.
Chemosphere. 2022 Sep;302:134750. doi: 10.1016/j.chemosphere.2022.134750. Epub 2022 Apr 30.
Increasing water pollution is a severe problem in densely industrialized countries. Nanomaterials provide strong potentials for the efficient elimination of organic pollutants due to their beneficial properties. Advancement in water purification is required to more efficiently remove the emerging organic contaminants, especially in pharmaceuticals wastes such as acetophenone, which shows high solubility in industrial wastewaters. Bismuth ferrite-based nanostructures were fabricated using a novel double solvent sol-gel method. The phase purity and crystallinity of bismuth ferrite were confirmed using XRD and further endorsed by TEM analysis. The SEM and XPS were used to study the particle sizes and presence of co-dopants on the Bi and Fe-sites of bismuth ferrite. After co-doping, the band-gap engineering of pure bismuth ferrites was accomplished by reducing it from 2.06 eV to 1.45 eV, likely attributing to the creation of shallow traps for the incoming photo-generated charge carriers. In particular, the BiGdFeSn and BiSmFeMn successfully eliminated up to 98% of acetophenone from polluted water in 3 h by irradiation of visible-light. These results reveal the suitability of the co-doped bismuth ferrites photocatalysts for the practical removal of pharmaceutical contaminants in hazardous industrial wastewater. The photodegradation of acetophenone by bismuth ferrite nanostructures with potentially long-lasting reusability demonstrate its potential as an advanced photocatalyst for wastewater treatment.
水污染加剧是工业化国家面临的严峻问题。由于纳米材料具有独特的性质，因此在去除有机污染物方面具有很大的应用潜力。为了更有效地去除新兴的有机污染物，特别是在制药工业废水中，如高溶解性的苯乙酮，需要进一步改进水净化技术。本研究采用一种新颖的双溶剂溶胶-凝胶法制备了铁酸铋基纳米结构。通过 XRD 确认了铁酸铋的相纯度和结晶度，TEM 分析进一步证实了这一点。SEM 和 XPS 用于研究纳米粒子的粒径和共掺杂剂在 Bi 和 Fe 位上的存在。共掺杂后，通过将纯铁酸铋的能带隙从 2.06 eV 降低到 1.45 eV，实现了能带隙工程，这可能归因于浅陷阱的形成，有利于光生电荷载流子的注入。特别是，BiGdFeSn 和 BiSmFeMn 在可见光照射下，3 小时内成功去除了高达 98%的水中的苯乙酮。这些结果表明，共掺杂铁酸铋光催化剂适用于实际去除危险工业废水中的药物污染物。铁酸铋纳米结构对苯乙酮的光降解具有潜在的长循环稳定性，这表明其作为废水处理的高级光催化剂具有广阔的应用前景。
