| 麦颖清,史妮静,谢水波,李绪忠.生物炭负载纳米氯磷灰石去除水中U(VI)的性能研究[J].南华大学学报(自然科学版),2024,(6):36~45, 77.[MAI Yingqing,SHI Nijing,XIE Shuibo,LI Xuzhong.Study on the Removal of U(VI) by Biochar Loaded Nano-chlorapatite Composited Materials[J].Journal of University of South China(Science and Technology),2024,(6):36~45, 77.] |
| 生物炭负载纳米氯磷灰石去除水中U(VI)的性能研究 |
| Study on the Removal of U(VI) by Biochar Loaded Nano-chlorapatite Composited Materials |
| 投稿时间：2024-03-23 |
| DOI： |
| 中文关键词: U(VI) 生物炭 纳米氯磷灰石 生物炭负载纳米氯磷灰石 |
| 英文关键词:U(VI) biochar nano-chlorapatite biochar loaded nano-chlorapatite |
| 基金项目: |
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| 摘要点击次数: 4 |
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| 中文摘要: |
| 针对铀矿冶中产生的低浓度含铀废水的处理,以松木屑、稻草秸秆和花生壳为原材料,采用共沉淀法在高温限氧条件下制备出3种生物炭负载纳米氯磷灰石复合材料(biochar loaded nano-chlorapatite composited material,nCLAP/BC),采用扫描电子显微镜(scanning electron microscope,SEM)、能量色散X射线谱(X-ray energy dispersive spectrum,EDS)、X射线衍射(X-ray diffraction,XRD)对松木屑生物炭负载纳米氯磷灰石复合材料(pine shavings biochar loaded nano-chlorapatite composited material,nCLAP/BC-1)进行表征,并探究不同因素对三者去除U(VI)过程的影响。结果表明:与对应原始生物炭(biochar,BC)相比,3种nCLAP/BC的除铀效果显著。在nCLAP/BC投加量为0.1 g/L、pH值为4、铀初始质量浓度为5 mg/L的最佳条件下,3种nCLAP/BC对U(VI)的去除率均超过99%,对U(VI)的吸附为以单分子层为主的化学吸附,且为自发吸热过程。综合而言,nCLAP/BC-1对U(VI)的去除效果在三者中最好。能量色散X射线谱EDS和X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)表征结果表明,nCLAP/BC-1去除U(VI)的过程复杂,涉及静电作用、溶解沉淀、离子交换、表面羟基等官能团的络合作用等机制。 |
| 英文摘要: |
| To treat the low-concentration uranium-containing wastewater, three kinds of biochar loaded nano-chlorapatite composited materials (nCLAP/BC) were prepared by co-precipitation method using pine shavings, discarded rice straw and peanut shells as raw materials. Scanning electron microscopy (SEM) and X-ray energy dispersive spectrum (EDS) were used to characterize pine shavings biochar loaded nano-chlorapatite composited material (nCLAP/BC-1). The effects of different factors on the adsorption process of U(VI) by the three were investigated. The results showed that compared with the corresponding original biochar (BC), the three types of nCLAP/BC had much greater uranium removal performance. Under conditions of nCLAP/BC dosage of 0.1 g/L, pH of 4 and the U(VI) initial concentration of 5 mg/L, the removal rate for U(VI) of three types of nCLAP/BC were all above 99%. The adsorption of U(VI) is a chemical adsorption dominated by a monolayer and a spontaneous endothermic process. Among the three, nCLAP/BC-1 had the best removal performance on the removal of U(VI). The characterization results of X-ray energy dispersive spectrum (EDS) and X-ray photoelectron spectroscopy (XPS) showed that the process of removing U(VI) by nCLAP/BC-1 was complex, involving electrostatic interaction, dissolution precipitation, ion exchange and complexation of functional groups such as surface hydroxyl groups. |
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