载磁铁矿-二氧化钛 PVA-海藻酸钠珠粒从水溶液中光催化还原去除铯（I）离子。
Photocatalytic reduction of Cs(I) ions removed by combined maghemite-titania PVA-alginate beads from aqueous solution.
机构信息
Centre for Environmental Sustainability and Water Security, Research Institute for Sustainable Environment, Faculty of Civil Engineering, Universiti Teknologi Malaysia, UTM Skudai, 81310, Johor Bahru, Malaysia.
Centre for Environmental Sustainability and Water Security, Research Institute for Sustainable Environment, Faculty of Civil Engineering, Universiti Teknologi Malaysia, UTM Skudai, 81310, Johor Bahru, Malaysia; Directorate General of Water Resources, Ministry of Public Works and Housing, Jalan Pattimura No. 20, Jakarta, 12110, Indonesia; Islamic Science Research Network, Muhammadiyah University of Hamka, Jalan Limau No. 2, Kabayoran Baru, Jakarta, 12130, Indonesia.
出版信息
J Environ Manage. 2017 Apr 15;191:219-227. doi: 10.1016/j.jenvman.2017.01.019. Epub 2017 Jan 18.
The presence of Cs(I) ions in nuclear wastewater becomes an important issue for the reason of its high toxicity. The development of adsorbent embedded metal-based catalysts that has sufficient adsorption capacity is expected for the removal of Cs(I) ions from contaminated water. This study tested the use of maghemite, titania and combined maghemite-titania polyvinyl alcohol (PVA)-alginate beads as an adsorbent to remove Cs(I) ions from aqueous solution with the variables of pH and initial concentration using batch experiments under sunlight. The results showed that the use of combined maghemite-titania PVA-alginate beads can have an efficiency of 93.1% better than the use of either maghemite PVA-alginate beads with an efficiency of 91.8% or titania PVA-alginate beads with an efficiency of 90.1%. The experimental data for adsorption of Cs(I) ions from aqueous solution with the initial concentrations of 50, 100 and 200 mg L on the surface of combined maghemite-titania PVA-alginate beads were well fit by the pseudo-second-order and Langmuir models. The optimal adsorption of Cs(I) ions from aqueous solution by combined maghemite-titania PVA-alginate beads under sunlight occurs at pH 8 with an initial Cs(I) ion concentration of 50 mg L. The combined maghemite-titania PVA-alginate beads can be recycled at least five times with a slight loss of their original properties.
核废水中 Cs(I) 离子的存在因其高毒性而成为一个重要问题。开发具有足够吸附能力的嵌入金属基催化剂的吸附剂有望用于从受污染的水中去除 Cs(I) 离子。本研究使用磁赤铁矿、二氧化钛和结合的磁赤铁矿-二氧化钛聚乙烯醇（PVA）-海藻酸钠珠作为吸附剂，通过在阳光下进行的批量实验，用 pH 和初始浓度等变量测试了从水溶液中去除 Cs(I) 离子的效果。结果表明，与使用磁赤铁矿 PVA-海藻酸钠珠（效率为 91.8%）或二氧化钛 PVA-海藻酸钠珠（效率为 90.1%）相比，使用结合的磁赤铁矿-二氧化钛 PVA-海藻酸钠珠的效率可提高 93.1%。初始浓度为 50、100 和 200mg/L 的 Cs(I) 离子在水溶液中的吸附实验数据，通过准二级和 Langmuir 模型得到很好的拟合。在 pH 8 下，初始 Cs(I) 离子浓度为 50mg/L，太阳光下结合的磁赤铁矿-二氧化钛 PVA-海藻酸钠珠对水溶液中 Cs(I) 离子的最佳吸附。结合的磁赤铁矿-二氧化钛 PVA-海藻酸钠珠至少可以循环使用五次，且几乎没有损失其原有性能。
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