Abstract

Water is one of the humanity’s major resources, but it is actually at risk due to growth and urbanization. Water reclamation and reuse was introduced as one of the solutions. However, the presence of organic pollutants, such as dyes, in the reclaim water can cause adverse effect to human. The dyes can be removed through photocatalysis process where semiconductor materials such as zinc oxide (ZnO) is used as the catalyst. In this research, several zinc oxide nanoparticles (ZnO NPs) were developed with pullulan as the capping agent through green synthesis. The impact of calcination conditions on the properties of synthesized ZnO NPs was explored. All the synthesized samples were subjected to photocatalytic degradation of two dyes, methyl orange (MO) and rhodamine B (RhB). The results indicated that with the increment of calcination temperature, the average particles size increased from 28.86 to 127.69 nm and the surface area reduced from 30.7996 to 12.3757 m² g⁻¹. As the calcination time changed, substantial impact was observed where, as calcination time increased to 2 h, the average particles size and the surface area significantly increased and reduced, respectively. The best photocatalytic degradation of MO and RhB was observed using ZnO NPs produced at 400 °C and 1 h calcination conditions. Overall, ZnO NPs have a good prospect to be applied for removal of dyes in wastewater.

Graphic abstract

中文翻译：

---

支链淀粉介导的氧化锌纳米颗粒在不同煅烧条件下对甲基橙和若丹明B的快速光致脱色

摘要

水是人类的主要资源之一，但实际上由于发展和城市化而处于危险之中。解决方案之一就是引入了水的回收和再利用。但是，再生水中有机污染物（如染料）的存在会对人体造成不利影响。可以通过光催化工艺去除染料，其中将诸如氧化锌（ZnO）的半导体材料用作催化剂。在这项研究中，通过绿色合成开发了几种以支链淀粉为封端剂的氧化锌纳米颗粒（ZnO NPs）。探讨了煅烧条件对合成ZnO NPs性质的影响。所有合成的样品均经过两种染料的光催化降解，分别为甲基橙（MO）和若丹明B（RhB）。结果表明，随着煅烧温度的升高，²  g ^-1。随着煅烧时间的变化，观察到了实质性的影响，随着煅烧时间增加到2 h，平均粒径和表面积分别显着增加和减少。使用在400°C和1 h煅烧条件下生产的ZnO NPs可以观察到MO和RhB的最佳光催化降解。总体而言，ZnO NP具有广阔的前景，可用于去除废水中的染料。

图形摘要