磁荧光顺磁离子(Gd,Mn,或Co)在较高的顺磁离子掺杂浓度下掺杂的I-III-VI量子点(QD)限制了它们在磁驱动水基应用中的使用。这项工作介绍,第一次,在16、20和30的高Gd摩尔比下使用稳定的磁荧光Gd掺杂的AgInS2QDs用于水环境中Ag离子的荧光检测和吸附。pH的影响,初始浓度,接触时间,并对吸附剂用量进行了系统评价。Gd摩尔比最小的AgInS2量子点(16)表现出最佳的荧光特性(LOD=0.88,R2=0.9549),而所有材料在优化条件下(pH为2,初始浓度为30ppm,接触时间为10分钟,吸附剂用量为0.02g),然后进行伪二级反应。吸附机理被认为是离子交换的组合,静电相互作用,络合,和扩散过程。在环境废水样品中的应用表明,Ag离子与Ti2Pb2离子一起完全去除,Ni2+,Cr3+,和Zn2+离子。
The poor fluorescence properties of magneto-fluorescent paramagnetic-ion (Gd, Mn, or Co) doped I-III-VI quantum dots (QDs) at higher paramagnetic-ion doping concentrations have limited their use in magnetic-driven water-based applications. This work presents, for the first time, the use of stable magneto-fluorescent Gd-doped AgInS2 QDs at high Gd mole ratios of 16, 20, and 30 for the fluorescence detection and adsorption of Ag+ ions in water environments. The effect of pH, initial concentration, contact time, and adsorbent dosage were systematically evaluated. The AgInS2 QDs with the least Gd mole ratio (16) exhibited the best fluorescence characteristics (LOD = 0.88, R2 = 0.9549) while all materials showed good adsorption properties under optimized conditions (pH of 2, initial concentration of 30 ppm, contact time of 10 min and adsorbent dosage of 0.02 g) and a pseudo 2nd order reaction was followed. The adsorption mechanism was proposed to be a combination of ion-exchange, electrostatic interaction, complexation, and diffusion processes. Application in environmental wastewater samples revealed complete removal of Ag + ions alongside Ti2+ Pb2+, Ni2+, Cr3+, and Zn2+ ions.