Department of Chemistry (BK21 FOUR) and Research Institute of Natural Science, Gyeongsang National University, Jinju, 52828, South Korea.
Nanomaterials and Nanotechnology Center (Electronic Convergence Division), Korea Institute of Ceramic Engineering & Technology, 101 Soho-ro, Jinju, 52851, South Korea.
Chemosphere. 2021 Jan;262:128358. doi: 10.1016/j.chemosphere.2020.128358. Epub 2020 Sep 15.
Discharge of heavy metals from various sources of industrial wastewater poses significant environmental and health concerns. Thus, efficient recovery of precious metals from wastewater employing sustainable, rapid, and cost-effective treatment methods is highly desirable. In this work, palladium nanoparticles (Pd NPs) were successfully recovered from industrial wastewater using a pulsed laser process in the absence of additives or reducing agents. Notably, the developed approach is faster and more environmentally friendly than other conventional recovery methods. The recovered Pd NPs were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and inductively coupled plasma optical emission spectroscopy (ICP-OES). Various pulsed laser parameters (i.e., laser wavelength, power, and irradiation time) were optimized to obtain ideal conditions for the pulsed laser ablation process. Effective recovery of the Pd metal from industrial wastewater was achieved at a laser wavelength of 355 nm, power of 40 mJ/pulse, and irradiation time of 30 min. The Pd NPs exhibited excellent catalytic activity toward the reduction of 4-nitrophenol. Thus, the recovered materials showed remarkable potential for application in degradation of toxic aromatic nitro compounds in the environment.
重金属从各种工业废水中的排放对环境和健康构成了重大威胁。因此，采用可持续、快速和经济有效的处理方法，从废水中高效回收贵金属是非常理想的。在这项工作中，钯纳米粒子（Pd NPs）在没有添加剂或还原剂的情况下，成功地通过脉冲激光工艺从工业废水中回收。值得注意的是，与其他传统回收方法相比，所开发的方法更快、更环保。回收的 Pd NPs 通过 X 射线粉末衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）和电感耦合等离子体发射光谱（ICP-OES）进行了表征。优化了各种脉冲激光参数（即激光波长、功率和辐照时间），以获得脉冲激光烧蚀过程的理想条件。在激光波长为 355nm、功率为 40mJ/脉冲和辐照时间为 30 分钟的条件下，实现了从工业废水中有效回收 Pd 金属。Pd NPs 对 4-硝基苯酚的还原表现出优异的催化活性。因此，回收的材料在环境中降解有毒芳香族硝基化合物方面显示出了显著的应用潜力。
