A novel highly efficient adsorbent {[Co4(L)2( μ3-OH)2(H2O)3(4,4′-bipy)2]·(H2O)2}n: synthesis, crystal structure, magnetic and arsenic (V) absorption capacity

Publication date: Available online 15 February 2018 Source:Journal of Solid State Chemistry Author(s): Chong Zhang, Yu Xiao, Yan Qin, Quanchun Sun, Shuhua Zhang A novel highly efficient adsorbent-microporous tetranuclear Co(II)-based polymer, {[Co4(L)2(μ 3-OH)2(H2O)3(4,4′-bipy)2]·(H2O)2}n (1, H3L = 4-(N,N′-bis(4-carboxybenzyl)amino) benzenesulfonic acid, 4,4′-bipy = 4,4′-bipyridine), was hydrothermally synthesized. The complex 1 is a metal–organic framework (MOF) material which was characterized by single-crystal X-ray diffraction, BET and platon software. Co-MOF (complex 1) reveals excellent adsorption property. The capacity of Co-MOF to remove arsenic As(V) from sodium arsenate aqueous solutions was investigated (The form of As(V) is AsO4 3-). The experimental results showed that Co-MOF had a higher stable and relatively high As(V) removal rate (>98%) at pH 4–10. The adsorption kinetics followed a pseudo-second-order kinetic model, and the adsorption isotherm followed the Langmuir equation. Co-MOF exhibits a very high adsorption capacity of As(V) in aqueous solution (Qmax of 96.08mg/g). Finally, the optimal adsorption conditions for the model were obtained through a Box–Behnken response surface experiment which was designed with adsorption time, dose, temperature and rotational speed of the shaker as the influencing factors to determine two-factor interaction effects. Co-MOF was further characterized using FTIR, PXRD, X-ray photoelectron spectr...

Source: Journal of Solid State Chemistry - February 15, 2018 Category: Chemistry Source Type: research