Synthesis of a novel hierarchical pillared Sep@Fe3O4/ZnAl-LDH composite for effective anionic dyes removal

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 663; p. 130921
• Main Authors: Chengqian, Fang, Wanbing, Liu, Yimin, Dai, Zhiheng, Wang, Yaqi, Li, Ling, Cai, Bo, Liu, Siwen, Yang, Junlong, Wang, Xianglong, Ding, Yue-Fei, Zhang, Yan, Li, Li, Wan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 20.04.2023
• Subjects: adsorbents; adsorption; Anionic dyes; coprecipitation; endothermy; Hierarchically pillared; magnetism; methyl orange; Nanoscale structural unit; Overall micron-scale morphology; porosity; Regeneration; Sep@Fe3O4/Zn Al-LDH composite; sorption isotherms; thermodynamics; Regeneration; Sep@Fe3O4/Zn Al-LDH composite; Anionic dyes; Overall micron-scale morphology; Hierarchically pillared; Nanoscale structural unit
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2023.130921

A novel magnetic hierarchically pillared Sep@Fe3O4/ZnAl-LDH composite was successfully synthesized via co-precipitation methods. The prepared Sep@Fe3O4/ZnAl-LDH composite were characterized via FTIR, XRD, XPS, SEM, TEM, BET and VSM. The results show that the Sep@Fe3O4/ZnAl-LDH composite have a hierarchical columnar structure with nanoscale structural unit (Fe3O4/ZnAl-LDH) and overall micron-scale morphology, and the obtained graded adsorbent has a large pore capacity and pore size distribution. The maximum adsorption capacities of the obtained samples for methyl orange ( MO) and Congo red ( CR) were 430 mg·g−1 and 832 mg·g−1, respectively. Kinetic data of MO and CR adsorbed on as-prepared samples can well fit with pseudo-second-order model. The isothermal data of MO and CR adsorbed on Sep@Fe3O4/ZnAl-LDH match well with the Langmuir model. The thermodynamic results indicate that the adsorption process is spontaneous and endothermic. Besides, the adsorbent shows good stability and reproducibility in a reusable cycle. This study demonstrated that Sep@Fe3O4/ZnAl-LDH provides a new idea for the development of a novel hierarchical magnetic pillared adsorbent for the efficient removal of anionic dyes. [Display omitted]