The simultaneous adsorption of U(VI), Pb(II), and humic acid (HA) in water solutions on a nanoscale zerovalent iron/molybdenum disulfide (nZVI/MoS₂) composite was investigated using batch, spectroscopic, and modeling techniques. An increased removal of U(VI) and Pb(II) and a gradual decrease in HA removal on nZVI/MoS₂ was observed with increasing pH from 2.0 to 7.0. The adsorption capacities of U(VI), Pb(II), and HA under ternary systems were 57.72, 40.43, and 55.43 mg/g (298 K, pH 4.0), respectively. In addition, nZVI/MoS₂ exhibited good regeneration due to the high surface area and uniform distribution of nZVI. The interaction mechanism was demonstrated to be inner-sphere surface complexation by XPS analysis and surface complexation modeling (SCM). The presence of Pb(II) and HA inhibited U(VI) reduction into U(IV) by nZVI according to XPS analysis; meanwhile, two inner-sphere complexation reactions (weak and strong sites) rather than redox reactions were demonstrated by SCM. These findings showed that nZVI/MoS₂ could be used as an efficient adsorbent for the high elimination of radionuclides, heavy metals, and organics in actual compound pollution of wastewater.

中文翻译：

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通过批量、光谱和建模技术研究 nZVI/MoS2 复合材料上 U (VI)、Pb(II) 和 HA 的协同去除


采用批量光谱法研究了纳米级零价铁/二硫化钼 (nZVI/MoS ₂ ) 复合材料对水溶液中 U(VI)、Pb(II) 和腐殖酸 (HA) 的同时吸附，以及建模技术。随着 pH 从 2.0 增加到 7.0，nZVI/MoS ₂ 上 U(VI) 和 Pb(II) 的去除增加，HA 去除逐渐减少。三元体系下U(VI)、Pb(II)和HA的吸附容量分别为57.72、40.43和55.43 mg/g (298 K, pH 4.0)。此外，由于nZVI的高表面积和均匀分布，nZVI/MoS ₂ 表现出良好的再生能力。通过XPS分析和表面络合建模（SCM）证明相互作用机制是内球表面络合。根据 XPS 分析，Pb(II) 和 HA 的存在抑制了 nZVI 将 U(VI) 还原为 U(IV)；同时，SCM 证明了两个内球络合反应（弱位点和强位点）而不是氧化还原反应。这些研究结果表明，nZVI/MoS ₂ 可以作为一种有效的吸附剂，用于高去除废水中实际复合污染中的放射性核素、重金属和有机物。