As a result of the scarcity of iodine, as well as its threat to the environment if it is present in excess, iodine as a waste needs to be captured. Compared with ion‐exchange resins and Ag‐containing materials, which are popular iodide adsorbents, Bi‐containing compounds show some important advantages, such as high iodide‐capture capacity and fast kinetics. In this study, two Bi‐containing compounds, BiVO₄ and Bi₂O₃, were investigated comprehensively for iodide immobilization. The influence of the pH, iodide/adsorbent ratio, temperature, crystallite size, and competing ions was explored, with a view to optimization of the capture process. Further study of the iodide‐adsorbed bismuth compounds confirms that the capture of iodide by BiVO₄ and Bi₂O₃ is a chemisorption process with the formation of bismuth oxyiodide (Bi_xO_yI_z). Furthermore, iodide ions are able to penetrate into the bulk of BiVO₄ and Bi₂O₃, which is believed to be responsible for their high capture capacity. The application of Bi_xO_yI_z as a photocatalyst has also been examined in Cr^VI reduction. This result makes the capture of iodide by BiVO₄ and Bi₂O₃ even more environmentally friendly as the photocatalytic application of the iodide‐containing adsorbents not only avoids the production of secondary waste but may help to solve other environmental issues.

中文翻译：

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钒酸铋和氧化铋对碘化物的捕获：过程及其后果的见解

由于碘的缺乏以及碘的过量存在对环境的威胁，需要捕获碘作为废物。与流行的碘化物吸附剂离子交换树脂和含银材料相比，含铋化合物显示出一些重要的优势，例如高碘化物捕获能力和快速动力学。在这项研究中，对两种含Bi的化合物BiVO ₄和Bi ₂ O ₃进行了全面的碘化物固定化研究。探讨了pH，碘化物/吸附剂比率，温度，微晶尺寸和竞争离子的影响，以优化捕获过程。对碘化物吸附的铋化合物的进一步研究证实，BiVO _4可以捕获碘化物Bi ₂ O ₃是化学吸附过程，形成碘氧化铋（Bi _x O _y I _z）。此外，碘离子能够渗透到BiVO ₄和Bi ₂ O ₃的主体中，这被认为是其高捕获能力的原因。还已经研究了在Cr ^VI还原中Bi _x O _y I _z作为光催化剂的应用。该结果使得BiVO ₄和Bi ₂ O ₃捕获碘化物。 由于对含碘化物的吸附剂进行光催化应用，因此更加环保，不仅避免了二次废物的产生，而且可能有助于解决其他环境问题。