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| Ca(ClO)2和Fe(Ⅱ)协同去除废水中铀的研究 |
| A Study of Synergistic Removal of Uranium from Wastewater Using Ca(ClO)2 and Fe(Ⅱ) |
| 投稿时间：2025-04-29 修订日期：2025-05-11 |
| DOI： |
| 中文关键词: U(VI) Fe(Ⅱ) Ca(ClO)2 共沉淀 |
| 英文关键词:U(Ⅵ) Fe(Ⅱ) Ca(ClO)2 coprecipitation |
| 基金项目:湖南省联合基金(2022JJ50154) |
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| 中文摘要: |
| Fe(Ⅱ)氧化生成的水解沉淀物对铀表现出优异的去除性能，从而实现水溶液中铀的高效去除。在常温、反应时间10 min的条件下，利用次氯酸钙分别对不含Fe2+和含Fe2+的铀溶液（初始pH=3）进行沉淀除铀实验，实验结果表明，在ClO-+UO22+体系中，当初始铀质量浓度为10 mg/L，Ca(ClO)2投加量为30 mg时，铀去除率为96.66%；Ca(ClO)2投加量的增加促使体系pH值上升。在ClO-+Fe2++UO22+体系中，Fe2+的存在可增强铀的去除效果。在初始Fe2+质量浓度为100 mg/L、铀质量浓度为10 mg/L、Ca(ClO)2投加量为35 mg的条件下，残留铀质量浓度降低至9 μg/L。对于实际废水，在相同条件下Ca(ClO)2投加量需增至45 mg，残留铀质量浓度可降至40 μg/L。Fe-U沉淀物表征结果表明，Fe(Ⅱ)主要转化为低结晶度或无定型铁（氢）氧化物，沉淀物中的铁元素和铀元素分别主要以Fe(Ⅲ)和U(Ⅵ)的形式存在。 |
| 英文摘要: |
| The hydrolyzed precipitates generated from the oxidation of Fe(Ⅱ) exhibit excellent uranium removal performance, thereby enabling the highly efficient removal of uranium from aqueous solutions. Under the conditions of room temperature and reaction time of 10 minutes, Ca(ClO)2 was used to conduct uranium precipitation experiments in uranium-containning solutions both without and with Fe2+ (initial pH=3). Experimental results demonstrate a uranium removal ?efficiency of 96.66% in the ClO-+UO22+ system under conditions of 10 mg/L initial UO22+ concentration and 30 mg Ca(ClO)2 dosage. Additionally, an increase in the dosage of Ca(ClO)2 leads to a rise in the system's pH. In the ClO-+Fe2++UO22+ system, the presence of Fe2+ enhances the uranium removal efficiency. Under the conditions of Fe2+ concentration at 100 mg/L, uranium concentration at 10 mg/L, and Ca(ClO)2 dosage at 35 mg, the residual uranium concentration is reduced to 9 μg/L. For actual wastewater, under the same conditions, the dosage of Ca(ClO)2 needs to be increased to 45 mg, which can reduce the residual uranium concentration to 40 μg/L. The characterization results of Fe-U precipitates indicate that Fe(Ⅱ) primarily transformed into low-crystallinity or amorphous iron (hydr)oxides. In the precipitate, iron and uranium primarily exist in the forms of Fe(Ⅲ) and U(Ⅵ), respectively. |
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