Adsorption behavior of arsenicals on MIL-101(Fe): The role of arsenic chemical structures

A new one‐dimensional coordination polymer synthesized from zinc and guanazole: Superior capture of organic arsenics

“…[ 29 ] To investigate the effect of the coexisting ions on the adsorption capacities of BUC‐70 for p ‐ASA and ROX, F − , NO 3 − , SO 4 2− , and PO 4 3− with C initial = 0.02 M were selected as foreign ions. [ 41, 43 ] As shown in Figure 7c,d, F − , NO 3 − , and SO 4 2− exerted a negligible effect on the adsorption capacity of BUC‐70 for p ‐ASA and ROX, whereas PO 4 3− strongly inhibited the adsorption behavior of BUC‐70 . As reported previously, phosphate and arsenate are chemically similar, which can form inner‐sphere complexes with the hydroxyl groups on the surface of the adsorbent.…”

“…[ 41 ] To further investigate the influence of the coexisting inorganic ions and dissolved organic matter (DOM), a series of aqueous p ‐ASA and ROX solutions prepared using tap water and lake water were tested. [ 29, 41 ] The parameters of water quality and the 3D EEM fluorescence spectrum are shown in Table S12 and Figure 8, respectively. According to the 3D EEM fluorescence spectrum of real water samples, DOM in tap water and lake water shows peaks at A, C, and T, respectively, indicating that the major fluorescent components of DOM in tap water and lake water are UV humic‐like, Visible humic‐like, and protein‐like tryptophan, respectively.…”

“…[ 52, 53 ] The results revealed that the adsorption capacity of BUC‐70 for p ‐ASA and ROX was slightly inhibited in the simulated wastewater (Figure 7a,b), which may be attributed to the influences from the coexisting inorganic ions and DOM. [ 41 ] However, the elimination efficiency was still 94% within 60 min, indicating the great prospects for the application of BUC‐70 for p ‐ASA and ROX adsorption in natural water.…”

“…[ 29 ] The O1s spectra (Figure 11c) of pristine BUC‐70 consisted of two peaks at 532.47 and 531.19 eV, which were assigned to H 2 O and Zn–OH bonds. [ 41, 61, 66 ] Compared with the spectra of virgin BUC‐70 , new peaks at 530.66 eV ( BUC‐70 after adsorbing p ‐ASA) and 530.96 eV ( BUC‐70 after adsorbing ROX) verify the formation of the Zn–O–As bond. [ 61, 67 ] Therefore, the first likely adsorption sites on BUC‐70 were the Zn–OH groups, which provided four Zn–OH groups in a unit Zn 2 cluster to attract a maximum of four equivalent organic arsenic species.…”

“…It is obvious that BUC‐70 and organic arsenics ( p ‐ASA and ROX) had obvious ample H‐donor and H‐acceptor moieties, such as –NH 2 and –OH. [ 29, 41 ] Thus, hydrogen bonding might be a possible contribution to adsorption. [ 30, 44, 61 ] As shown in Figure 11d, after adsorption of p ‐ASA and ROX, hydrogen‐bonded –NH 2 groups appeared on the N1s spectra of BUC‐70 , indicating that hydrogen bonding between BUC‐70 and organic arsenics ( p ‐ASA and ROX) also played an important role in the adsorption process.…”