University School of Chemical Technology, Guru Gobind Singh Indraprastha University, Dwarka Sector 16C, New Delhi, 110078, India.
Environ Sci Pollut Res Int. 2022 Mar;29(15):22093-22105. doi: 10.1007/s11356-021-17159-1. Epub 2021 Nov 15.
Herein, we report a facile synthesis of Ni/NiO/SnO hybrids where the core-shell-type Ni/NiO nanoparticle is decorated with the SnO nanoparticle to make a heterojunction and their potential evaluation for simultaneous removal of organic and inorganic pollutants. The metallic nickel core of the nanoparticle helps to separate easily from water magnetically and restricts the possible secondary contamination. The formation of semiconductor-semiconductor heterojunction enhances the photocatalytic activity to degrade the organic pollutants. The nanomaterial was characterized using microscopic, spectroscopic, and BET analyses. Results indicated an efficient degradation of ~ 94% of crystal violet in 40 min. An adsorption capacity of ~ 530 mg g and ~ 650 mg g of cadmium and lead ions, respectively, was found for single-component adsorption experiments, and ~ 520 mg g and ~ 720 mg g of cadmium and lead ions, respectively, were found for multi-component experiments. This observation suggested that the lead and cadmium ion adsorption process is affected by the synergistic and antagonistic effects, respectively. However, no significant change in the photocatalytic activity was observed for multi-component experiments. Results indicated that the process followed the Langmuir isotherm and pseudo-second-order kinetics irrespective of the number of pollutants present. An excellent adsorption capacity of metal ions and photodegradation capability of organic dye in multi-component solution, and possible reusability of the nanoparticle, make the Ni/NiO/SnO a potential material for simultaneous removal of organic and inorganic pollutants.
在此，我们报告了一种简便的 Ni/NiO/SnO 杂化材料的合成方法，其中核壳型 Ni/NiO 纳米颗粒被 SnO 纳米颗粒修饰以形成异质结，并评估了它们同时去除有机和无机污染物的潜力。纳米颗粒的金属镍核有助于通过磁性从水中轻松分离，并限制可能的二次污染。半导体-半导体异质结的形成增强了光催化活性，从而降解有机污染物。使用微观、光谱和 BET 分析对纳米材料进行了表征。结果表明，在 40 分钟内，对结晶紫的有效降解率约为 94%。在单一组分吸附实验中，分别发现了约 530 mg/g 和 650 mg/g 的镉和铅离子的吸附容量，在多组分实验中，分别发现了约 520 mg/g 和 720 mg/g 的镉和铅离子的吸附容量。这一观察结果表明，铅和镉离子的吸附过程分别受到协同和拮抗作用的影响。然而，多组分实验中光催化活性没有明显变化。结果表明，无论存在多少污染物，该过程均遵循 Langmuir 等温线和拟二级动力学。在多组分溶液中，金属离子具有出色的吸附容量和有机染料的光降解能力，以及纳米颗粒可能的可重复使用性，使 Ni/NiO/SnO 成为同时去除有机和无机污染物的潜在材料。
