Due to the uncontrolled discharge of textile effluents, the extent of reactive dyes in wastewater is rising. Due to their toxicity, efficient removal becomes quite essential. In this report, NiAl layered double hydroxide (LDH) has been prepared using the coprecipitation methodology for the photocatalytic degradation of reactive dyes. The as-prepared materials were characterized by different techniques, such as DRS, XRD, FESEM, HRTEM, and XPS etc. The XRD pattern of the LDH confirms the formation of the rhombohedral (3m) phase. The FESEM analysis reveals the irregular hexagon-like shape of the prepared LDH. The NiAl LDH has 98(1) and 87(1)% photodegradation efficiencies towards the removal of reactive blue 19 and reactive Red 120, respectively. The control experiments in the presence of different scavengers confirm that hydroxyl radicals and superoxide anions participate in photocatalytic degradation. The HRMS studies confirm the formation of different smaller fragments, thereby providing a deeper insight into the photodegradation mechanism. Moreover, the demineralization efficiency (88.9%) is quite close to the degradation efficiency for reactive blue 19, signifying practically complete demineralization of the pollutants. The recyclability studies ascertain the high stability of the photocatalyst. Therefore, the as-prepared NiAl LDHs can be considered a promising photocatalyst for the removal of reactive dyes from wastewater.

中文翻译：

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Ni[sbnd]Al层状双氢氧化物光催化降解活性染料

由于纺织废水的无控制排放，废水中活性染料的含量不断上升。由于它们的毒性，有效去除变得非常重要。在本报告中，采用共沉淀方法制备了 NiAl 层状双氢氧化物 (LDH)，用于光催化降解活性染料。通过不同的技术对所制备的材料进行了表征，如 DRS、XRD、FESEM、HRTEM 和 XPS 等。LDH 的 XRD 图案证实了菱面体 (3m) 相的形成。 FESEM 分析显示所制备的 LDH 具有不规则的六边形形状。 NiAl LDH 去除活性蓝 19 和活性红 120 的光降解效率分别为 98(1)% 和 87(1)%。在不同清除剂存在下的对照实验证实羟基自由基和超氧阴离子参与光催化降解。 HRMS 研究证实了不同较小碎片的形成，从而更深入地了解光降解机制。此外，脱盐效率（88.9%）与活性蓝19的降解效率非常接近，表明污染物几乎完全脱盐。可回收性研究确定了光催化剂的高稳定性。因此，所制备的 NiAl LDHs 可以被认为是一种有前途的光催化剂，用于去除废水中的活性染料。