Department of Research & Development, Energy Acres Building, University of Petroleum & Energy Studies (UPES), Bidholi, Dehradun, Uttarakhand, 248007, India.
Wastewater Technology Division, CSIR-National Environmental Engineering Research Institute, Nagpur, Maharashtra, 440020, India.
Environ Sci Pollut Res Int. 2021 Nov;28(42):59551-59569. doi: 10.1007/s11356-021-16296-x. Epub 2021 Sep 11.
Direct or indirect discharge of wastes containing organic pollutants have contributed to the environmental pollution globally. Decontamination of highly polluted natural resources such as water using an effective treatment is a great challenge for public health and environmental protection. Photodegradation of organic pollutants using efficient photocatalyst has attracted extensive interest due to their stability, effectiveness towards degradation efficiency, energy, and cost efficiency. Among various photocatalysts, layered double hydroxides (LDHs) and their derivatives have shown great potential towards photodegradation of organic pollutants. Herein, we review the mechanism, key factors, and performance of LDHs and their derivatives for the photodegradation of organic pollutants. LDH-based photocatalysts are classified into three different categories namely unmodified LDHs, modified LDHs, and calcined LDHs. Each LDH category is reviewed separately in terms of their photodegradation efficiency and kinetics of degradation. In addition, the effect of photocatalyst dose, pH, and initial concentration of pollutant as well as photocatalytic mechanisms are also summarized. Lastly, the stability and reusability of different photocatalysts are discussed. Challenges related to modeling the LDHs and its derivatives are addressed in order to improve their functional capacity.
直接或间接排放含有有机污染物的废物已导致全球环境污染。使用有效处理方法对受污染的自然资源（如水源）进行净化，这对公共健康和环境保护是一个巨大的挑战。利用高效光催化剂进行有机污染物的光降解因其稳定性、降解效率、能量和成本效益而受到广泛关注。在各种光催化剂中，层状双氢氧化物（LDHs）及其衍生物在有机污染物的光降解方面表现出巨大的潜力。本文综述了 LDHs 及其衍生物用于光降解有机污染物的机制、关键因素和性能。基于 LDH 的光催化剂分为三类：未改性 LDH、改性 LDH 和煅烧 LDH。分别从光降解效率和降解动力学的角度对每种 LDH 类别的光催化剂进行了综述。此外，还总结了光催化剂剂量、pH 值、污染物初始浓度以及光催化机制的影响。最后，讨论了不同光催化剂的稳定性和可重复使用性。还讨论了与 LDHs 及其衍生物建模相关的挑战，以提高其功能能力。
