CdO@C合成及其对酸性染料和重金属离子的吸附研究
- Synthesis of CdO@C and its adsorption for acid dye and heavy metal ion
- 摘要：以酸性红14 (AR14),Cd(NO3)2?4H2O为原料,通过共沉积-煅烧法合成CdO@C。利用XRD、FT-IR、N2吸脱附、SEM、XPS等技术对合成样品结构性能进行表征,结果表明,CdO@C为六方纳米片状结构,富含羟基与羧基,孔隙率较高。考察煅烧温度与碳引入量对产物性质的影响,结果表明煅烧温度对产物性能影响较大,而碳引入量影响不大。利用合成的CdO@C为吸附剂对进行吸附,结果表明400S℃煅烧产物对AR14和Cu2+的吸附效率都较高；引入Cu2+可提高AR14的吸附效率,而AR14对Cu2+吸附效率影响不大。此外,对CdO@C吸附AR14和Cu2+的机理进行了研究,结果表明吸附剂与Cu2+之间存在π电子配位键和正常配位键,而吸附剂与AR14之间存在氢键和静电引力；AR14与Cu2+混和后,两者之间通过配位键结合,所以吸附剂对混合液的吸附效率也较好。
- Abstract：CdO@C was synthesized by an codeposition and calcination method using AR14 and Cd(NO3)2?4H2O as raw materials. The synthesized samples were characterized by XRD, FT-IR, N2 adsorption and desorption, SEM, XPS, etc., and the results show that CdO@C with hexagonal nanosheet structure was obtained, and that numerous hydroxyl, carboxyl, and pores were produced in the synthesized samples. Effects of calcination temperature and carbon introduction on the properties of products were investigated, and the results show that the calcination temperature has a significant impact on the performance of the product, while the impact of carbon introduction is not so significant. The results of adsorption of AR14 and Cu2+ over CdO@C illustrate that the adsorbent prepared at 400S℃ has an efficient adsorption efficiency for both single and dual components, and that Cu2+can improve the removal efficiency of AR14, while the introduction of AR14 has little effect on the adsorption efficiency of cu2+. Furthermore, the adsorption mechanism of AR14 and Cu2+ over CdO@C was studied and the results show that π electronic coordination bonds and normal coordination bonds are formed between Cu2+ and adsorbent, and hydrogen bonding and electrostatic attraction are the main interaction between AR14 and adsorbent, and that the formation of coordination bond between Cu2+ and AR14 result in a high adsorption efficiency for the mixture of Cu2+ and AR14 over CdO@C.
