The bimetallic platinum-nanoscale zero-valent iron (Pt/nZVI) composites were synthesized by a liquid-phase reduction method. The as-prepared nanomaterials were first characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface area analysis, and zeta potential measurements. Results revealed that the introduction of Pt into bimetallic particles strongly affected their morphologies, which caused the improvement in the adsorption ability for organics. With 0.5 wt.% of Pt in Pt/nZVI composite (denoted as Pt0.5/nZVI), it exhibited the highest removal of antibiotic oxytetracycline (OTC). Nearly 100% of OTC (initially, 100 mg/L) was removed only after 20-min treatment under an optimal pH of 5.0 and a dose of 0.5 g/L. This study also confirmed that the removal of OTC by Pt/nZVI composite was contributed by adsorption (major), Fenton reactions, and reduction, although the fractional contribution changed during the reaction process. The intermediates formed during OTC degradation by nZVI and Pt/nZVI composite were finally detected and compared by UPLC®-QTof/MS analysis, which confirmed that the presence of Pt metal in bimetallic Pt/nZVI composites generated extra reactive hydrogen atoms for enhanced degradation of OTC.

通过液相还原法合成了双金属铂-纳米零价铁（Pt / nZVI）复合材料。首先通过扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线衍射（XRD），X射线光电子能谱（XPS），Brunauer-Emmett-Teller（BET）表面积表征制备的纳米材料分析和Zeta电位测量。结果表明，将Pt引入双金属颗粒会极大地影响其形貌，从而提高了对有机物的吸附能力。Pt / nZVI复合材料中的Pt含量为0.5 wt。％（表示为Pt0.5 / nZVI）时，它显示出最高的抗生素土霉素（OTC）去除率。仅在最佳pH 5.0和0.5 g / L的条件下处理20分钟后，才除去近100％的OTC（最初为100 mg / L）。这项研究还证实，尽管分数贡献在反应过程中发生了变化，但Pt / nZVI复合材料去除OTC的原因是吸附（主要），Fenton反应和还原。最终检测到nZVI和Pt / nZVI复合材料在OTC降解过程中形成的中间体，并通过UPLC®-QTof/ MS分析进行比较，这证实了双金属Pt / nZVI复合材料中Pt金属的存在产生了额外的反应性氢原子，从而增强了Pb / nZVI复合材料的降解。场外交易。