摘要
本文通过氨性浸出方式处理吸附Cd(Ⅱ)之后的零价铁材料(Fe≡Cd),使表面吸附的Cd(Ⅱ)脱附同时对材料改性,获得了一种新的改性铁基磁性材料(MFe)。基于紫外光谱、溶液化学和量子化学分析,证实了Fe≡Cd上的Cd(Ⅱ)与游离NH_(3)结合形成Cd-NH_(3)配合物从而实现脱附的可行性。结果表明:(NH_(4))_(2)SO_(4)和NH_(3)·H_(2)O浸出可以有效脱附Fe≡Cd表面的Cd(Ⅱ)。脱附改性后材料的结构性质发生了明显改变,生成了大量吸附活性强的铁(羟基)氧化物,且—NH_(2)基团成功修饰在材料表面,为Cd(Ⅱ)提供了更多的吸附位点。改性磁性材料(MFe)对Cd(Ⅱ)的吸附量较Fe^(0)(Q_(e)=23.5 mg/g)明显提升,达47.0 mg/g,且循环再生性能良好,可高效循环6次以上。
The material(Fe≡Cd)after Cd(Ⅱ)adsorptionwas treated by ammonia leaching,the adsorbed Cd(Ⅱ)was desorbed and the material was modified at the same time,and a new modified ferro-based magnetic material(MFe)was obtained.Based on UV spectrum,solution chemistry and quantum chemistry analysis,it is confirmed that Cd(Ⅱ)on Fe≡Cd combines with free NH_(3) to form Cd-NH_(3) complexes to achieve desorption.The results show that(NH_(4))_(2)SO_(4) and NH_(3)·H_(2)O leaching can desorb Cd(Ⅱ)on the surface of Fe≡Cd effectively.The structure and properties of MFe have been significantly changed,and a large number of iron(hydroxyl)oxides with strong adsorption activity have been generated,and the—NH_(2) group has been successfully modified on the surface of the material,providing more adsorption sites for Cd(Ⅱ).The adsorption capacity of MFe for Cd(Ⅱ)is significantly higher than that of Fe^(0)(Q_(e)=23.5 mg/g),reaching up to 47.0 mg/g.The recycling performance is favorable,and it can be efficiently recycled for more than 6 times.
作者
付君浩
李振兴
田志国
曾礼强
邓朝政
吴江岳恩
韩海生
FU Junhao;LI Zhenxing;TIAN Zhiguo;ZENG Liqiang;DENG Chaozheng;WU Jiangyueen;HAN Haisheng(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Hunan Shizhuyuan Nonferrous Metals Co.,Ltd.,Chenzhou 423037,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2024年第2期640-652,共13页
The Chinese Journal of Nonferrous Metals
基金
国家重点研发计划资助项目(2022YFC2905104,2022YFC2905105)
国家自然科学基金资助项目(52122406)
湖南省高新技术产业科技创新引领计划资助项目(2021GK4056)。
作者简介
通信作者:韩海生,博士,教授,电话:15111046402,E-mail:hanhai5086@csu.edu.cn。
