Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea.
Water Quality Center, Chemicals & Environment Research Institute, Korea Testing & Research Institute, Gyeonggi-do 13810, Korea.
Int J Mol Sci. 2022 Oct 13;23(20):12225. doi: 10.3390/ijms232012225.
The granulation of bismuth oxide (BO) by alginate (Alg) and the iodide adsorption efficacy of Alg-BO for different initial iodide concentrations and contact time values were examined. The optimal conditions for Alg-BO granulation were identified by controlling the weight ratio between Alg and BO. According to the batch iodide adsorption experiment, the Alg:BO weight ratio of 1:20 was appropriate, as it yielded a uniform spherical shape. According to iodide adsorption isotherm experiments and isotherm model fitting, the maximum sorption capacity () was calculated to be 111.8 mg/g based on the Langmuir isotherm, and this value did not plateau even at an initial iodide concentration of 1000 mg/L. Furthermore, iodide adsorption by Alg-BO occurred as monolayer adsorption by the chemical interaction and precipitation between bismuth and iodide, followed by physical multilayer adsorption at a very high concentration of iodide in solution. The iodide adsorption over time was fitted using the intraparticle diffusion model. The results indicated that iodide adsorption was proceeded by boundary layer diffusion during 480 min and reached the plateau from 1440 min to 5760 min by intraparticle diffusion. According to the images obtained using cross-section scanning electron microscopy assisted by energy-dispersive spectroscopy, the adsorbed iodide interacted with the BO in Alg-BO through Bi-O-I complexation. This research shows that Alg-BO is a promising iodide adsorbent owing to its high adsorption capacity, stability, convenience, and ability to prevent secondary pollution.
研究了藻酸盐（Alg）对氧化铋（BO）的颗粒化作用以及 Alg-BO 对不同初始碘浓度和接触时间的碘吸附效果。通过控制 Alg 和 BO 之间的重量比来确定 Alg-BO 造粒的最佳条件。根据间歇碘吸附实验，Alg:BO 的重量比为 1:20 是合适的，因为它产生了均匀的球形。根据碘吸附等温线实验和等温线模型拟合，根据 Langmuir 等温线计算出最大吸附容量（）为 111.8 mg/g，即使在初始碘浓度为 1000 mg/L 时，该值也没有达到平台。此外，Alg-BO 对碘的吸附是通过铋和碘之间的化学相互作用和沉淀进行的单层吸附，然后在溶液中碘浓度非常高时进行物理多层吸附。通过内颗粒扩散模型拟合碘随时间的吸附。结果表明，碘的吸附在 480 min 内通过边界层扩散进行，在 1440 min 至 5760 min 内通过内颗粒扩散达到平台。根据带有能量色散光谱的截面扫描电子显微镜获得的图像，吸附的碘通过 Bi-O-I 络合与 Alg-BO 中的 BO 相互作用。这项研究表明，Alg-BO 是一种很有前途的碘吸附剂，因为它具有高吸附容量、稳定性、便利性和防止二次污染的能力。
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