Zhang Xinyu, Sun Rui, Sun Shixin, Ren Fangfang, Chen Xuanrong, Wu Lin, Xing Rong
College of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng 224002, China.
College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, China.
ACS Omega. 2019 Mar 29;4(3):6068-6076. doi: 10.1021/acsomega.9b00379. eCollection 2019 Mar 31.
With the increasing consumption of natural resources, photocatalysis converting solar energy to chemical energy has attracted extensive attention of researchers owing to the advantages of developing energy-saving and environmentally benign processes. In this work, a facile and simple method was developed to synthesize a metal-free organic optoelectronic molecule (denoted as DPPRD), which is composed of a central diketopyrrolopyrrole moiety and two terminal units of a rhodanine (RD) moiety. This is a first green strategy toward the synthesis of DPPRD. Because of good thermal stability, narrow band gap, and excellent visible light absorption of solar spectrum, DPPRD exhibited to be an efficient and chemically stable photocatalyst for visible light degradation of organic pollutants such as bisphenol A (BPA) and methyl orange (MO) in aqueous solution. The control experiments with different types of radical scavengers implied that the hole (h) and hydroxyl radicals (OH) were the key reactive species during the photodegradation processes. The photodegradation pathways of BPA and MO were thus proposed based on the identified intermediates. This improved method for DPPRD synthesis is expected to widen its applications to industrial production, whereas its excellent visible light photocatalytic activity would be utilized potentially in the field of environmental and industrial applications.
随着自然资源消耗的不断增加，光催化将太阳能转化为化学能因其在开发节能和环境友好工艺方面的优势而受到研究人员的广泛关注。在这项工作中，开发了一种简便的方法来合成一种无金属有机光电分子（表示为DPPRD），它由一个中心二酮吡咯并吡咯部分和两个罗丹宁（RD）部分的末端单元组成。这是合成DPPRD的首个绿色策略。由于具有良好的热稳定性、窄带隙以及对太阳光谱优异的可见光吸收能力，DPPRD在水溶液中对双酚A（BPA）和甲基橙（MO）等有机污染物的可见光降解方面表现出是一种高效且化学稳定的光催化剂。使用不同类型自由基清除剂的对照实验表明，空穴（h）和羟基自由基（OH）是光降解过程中的关键活性物种。基于鉴定出的中间体，提出了BPA和MO的光降解途径。这种改进的DPPRD合成方法有望扩大其在工业生产中的应用，而其优异的可见光光催化活性有望在环境和工业应用领域得到潜在利用。
