Dyes are broadly utilized and therefore wastewaters discharged into rivers or public sewage treatment plants are extremely polluted. Thus, the current work aimed to study the kinetic for photocatalytic degradation of Basic Red 51 (BR51) dye in aqueous solution by green synthesized zinc oxide nanoparticles (ZnO NPs). The results revealed that the maximum degradation (98.40%) and chemical oxygen demand (COD) removal (98.08%) was recorded with 150 mg of ZnO NPs, pH 3 and 5 ppm of BR51. ZnO NPs showed high reusability of 95.73%. The photocatalytic degradation of BR51 follows pseudo first‐order kinetics, the apparent rate constants (Kapp) of solar photocatalytic degradation of BR51 were determined as 0.3798, 0.6066, 0.2747 and 0.1307 min⁻¹ for 5, 10, 15 and 20 ppm of BR51 at optimum condition respectively. Phytotoxicity study confirms that the degraded products of BR51 are non‐toxic. This confers the possibility of applying green ZnO NPs for the treatment of industrial wastewaters containing dye pollutants to ensure the environmental sanitation for future generations.

中文翻译：

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绿色ZnO纳米粒子光催化剂有效降解BR51的动力学及机理研究

染料被广泛使用，因此排放到河流或公共污水处理厂中的废水受到了严重污染。因此，当前的工作旨在研究绿色合成的氧化锌纳米粒子（ZnO NPs）在水溶液中对碱性红51（BR51）染料进行光催化降解的动力学。结果表明，使用150 mg ZnO NP，pH 3和5 ppm BR51记录了最大降解（98.40％）和化学需氧量（COD）去除（98.08％）。ZnO NPs的可重用性高达95.73％。BR51的光催化降解遵循拟一级反应动力学，太阳光催化降解BR51的表观速率常数（Kapp）确定为0.3798、0.6066、0.2747和0.1307 min ^-1在最佳条件下分别添加5、10、15和20 ppm的BR51。植物毒性研究证实，BR51的降解产物无毒。这赋予了将绿色ZnO NP用于处理含有染料污染物的工业废水的可能性，以确保子孙后代的环境卫生。