The Fabrication And Selective Adsorption Performance Of Structured Adsorbent Nial-Composite Oxide

Structured adsorbent with highly dispersed active component, large specific area and mechanical stability have captured the attention of researchers. In this paper, we choose porous nickel foam as substrate to get a hierarchical architecture adsorbent. At the first step, we synthesised NiAl-LDH film on the surface of Ni foam by a facile in-situ growth method. Then, we fabricated the final structured adsorbent NiAl-LDO/Ni-Foam, with calcined NiAl-layered double hydroxide (LDO) particles uniformly grown on metal substrate, after calcination of the precursor (NiAl-LDO/Ni-Foam) at 400?. The morphology and structure of adsorbents were characterized by XRD, FTIR and SEM. The concentration of anions were qualified by ion chromatography (ICS-90A).Batch experiments were carried out to investigate the selective adsorption performance of the obtained material for anions removal in aqueous solution. The results show that, NiAl-LDO/Ni-Foam has highly selective adsorption for S2O32- in the SCN- -containing solution. The removal percentage of S2O32- was nearly 80%(SCN- was 5.1%) at room temperature. The maximum adsorption capacity was about 209.4 mg/g for S2O32- at room temperature, while only 16.0 mg/g for SCN-. The adsorption performance of this material was maintained well (51.3%) after 10 cycles of adsorption-regeneration. Besides, the as-prepared NiAl-LDO/Ni-Foam displays preferential adsorption behavior for the selective removal of F" from the mixture solution containing Cl- and Br-. The removal percentage for the three anions were 73.6%,31% and 25.1%, respectively. The maximum adsorption capacity of F- was about 16.12 mg/g at 308 K.From the comparative tests, the structured NiAl-LDO/Ni-Foam exhibits a higher selective adsorption capacity, more stable regeneration and flexibility than the corresponding LDO powder sample. Moreover, it was much facile for the subsequent separation of liquid and solid after adsorption reaction, when use structured NiAl-LDO/Ni-Foam as adsorbent. Herein, it comes to the conclusion that the obtained 3D hierarchical NiAl-LDO/Ni-Foam is an efficient adsorbent with good selective performance in the removal of anions in aqueous solution.