Chemistry Department, Faculty of Science, Helwan University, Ain Helwan, Cairo, 11795, Egypt.
Environ Sci Pollut Res Int. 2022 Sep;29(43):64792-64806. doi: 10.1007/s11356-022-19970-w. Epub 2022 Apr 27.
Tailoring a material that has a synergistic role as an adsorbent and a photocatalyst for environmental application is an attractive field for research. This article presents a study of facile synthesis of NiO and Ni/NiO with a synergistic role as super adsorbents in the lake of light and photocatalysts under light irradiation. Nano flower-like mesoporous NiO and Ni/NiO were synthesized by the co-precipitation method. XRD, SEM, EDAX, XPS, BET, and DR/UV-Vis spectroscopy techniques were employed for samples' analysis. The point of zero surface charge of prepared samples was detected by the batch equilibrium method. The adsorption efficiency was investigated in the absence of light using aniline blue as a pollutant model dye. The synergistic effect as an adsorbent and a photocatalyst was investigated under UV and sunlight irradiation. Different parameters affecting the adsorption in the dark have been optimized. The results showed that in the absence of light, the prepared samples are super adsorbents with a maximum adsorption capacity ranging from 210 to 230 mg g and a removal % ranging from 95 to 100% within 2 h. Under UV or sunlight irradiation, the adsorbent/photocatalyst attained a dye removal % of 99.8% within 30 min. The adsorption data matched the pseudo-second-order model, and the equilibrium adsorption data showed compatibility with Langmuir model. The findings of experiments revealed that the adsorption is spontaneous, exothermic, and results in less entropy. Under sunlight irradiation, the dye removal efficiency increased by 19% in the case of Ni/NiO hybrid; it showed a removal efficiency of 99.5% within 30 min under sunlight irradiation versus 80% after 120 min in the dark.
将具有协同吸附剂和光催化剂作用的材料应用于环境领域是一个很有吸引力的研究方向。本文研究了在缺乏光照的情况下，NiO 和 Ni/NiO 纳米花状介孔材料作为超级吸附剂和光催化剂的协同作用。采用共沉淀法制备了 NiO 和 Ni/NiO 纳米花状介孔材料。采用 XRD、SEM、EDAX、XPS、BET 和 DR/UV-Vis 光谱技术对样品进行了分析。采用批量平衡法测定了样品的零电荷点。采用亚甲基蓝作为模型污染物染料，在缺乏光照的情况下研究了吸附效率。在紫外光和太阳光照射下研究了协同吸附剂和光催化剂的作用。优化了影响暗吸附的不同参数。结果表明，在缺乏光照的情况下，所制备的样品是具有 210 至 230mg/g 的最大吸附容量和 95%至 100%的去除率的超级吸附剂，在 2h 内即可达到。在紫外光或太阳光照射下，吸附剂/光催化剂在 30min 内可达到 99.8%的染料去除率。吸附数据符合准二级动力学模型，平衡吸附数据符合 Langmuir 模型。实验结果表明，吸附是自发的、放热的，熵减少。在太阳光照射下，Ni/NiO 杂化体的染料去除效率提高了 19%；在太阳光照射下 30min 内的去除效率为 99.5%，而在黑暗中 120min 后为 80%。
