Highly efficient and facile removal of As(V) from water by using Pb‐MOF with higher stable and fluorescence

Abstract

Metal–organic framework (MOF) materials are promising adsorbents for removing As(V) from sodium arsenate aqueous solutions, because of their high porosity and functional modulability. Two novel Pb(II) complexes {[Pb2(bcabsa)(μ2‐OH)]}n (Pb (bcabsa)) and {[Pb (Hbcabsa)]·(4,4′‐bpy)(H2O)}n (Pb (bcabsabpy)) (H3bcabsa = 4‐(N,N′‐bis(4‐carboxy benzyl)amino)benzene‐sulfonic acid, 4,4′‐bpy = 4,4′‐bipyridine), were hydrothermally synthesized. Pb (bcabsabpy) was characterized by single‐crystal X‐ray diffraction (SC‐XRD), X‐ray photoelectron spectroscopy (XPS), photoluminescence, powder X‐ray diffraction (XRD), and infrared radiation (IR) before and after the adsorption of As(V). In addition, the capacity of Pb (bcabsabpy) to remove arsenic was also investigated. The experimental results showed that Pb (bcabsabpy) had high stability within pH 4–12 and a relatively high As(V) removal rate (>90%) in the pH range of 4–10. The adsorption kinetics followed the pseudo‐second‐order kinetic model, whereas the adsorption isotherm was in agreement with the Langmuir equation. Pb (bcabsabpy) had a high adsorption capacity of As(V) in an aqueous solution (Qmax of 25.51 mg g−1). The fluorescence mechanism of the H3bcabsa, Pb (bcabsa), and Pb (bcabsabpy) are assigned to π‐π*, n‐π*, and π‐π* electron transition processes, respectively.

Exfoliation of a Coordination Polymer Based on a Linear π-Conjugated Ligand into an Ultrathin Nanosheet for Glyphosate Sensing

“…As a type of inorganic–organic hybrid material, coordination polymers (CPs) are assembled from the coordination between organic linkers and metal cations/clusters with repeating coordination entities extending in 1, 2, or 3 dimensions and have emerged as one of the most fascinating candidates of luminescent materials in the field of fluorescence sensing, − light-emitting diodes (LEDs), , bioimaging, nonlinear optics (NLOs), , upconversion materials, , and so on, due to tunable luminescence properties. , Among various CPs, the entities with potential voids that are usually well-known as porous coordination polymers (PCPs) or metal–organic frameworks (MOFs) have been of the most concern and gained tremendous success in various fields due to structural diversity, high porosity, large surface area, and easy modification. − Additionally, external stimuli can induce significant changes in the fluorescence properties of CPs through varieties of mechanisms, including structure transformation/collapse, size exclusion, energy transfer, photoinduced electron transfer (PET), guest exchange, and so on, − which offer the feasibility of employing CPs to serve as fluorescent sensing materials. Thus, tremendous efforts have been devoted to the exploration of CPs as fluorescent sensors and quantities of CPs have displayed outstanding fluorescence sensing performance for varieties of chemicals, including hazardous gas, volatile organic compounds (VOCs), explosives, pesticides, antibiotics, amino acids, or parameters such as pH and temperature. , Although various metal cations could be employed to prepare CPs, transition metal cations with d 10 electron configuration, especially Zn­(II) and Cd­(II), are of special concern in the construction of fluorescent CPs due to their potential superior fluorescence properties originating from the possible ligand-to-metal charge transfer (LMCT) process. ,− …”

Robust {Pb10}-Cluster-Based Metal–Organic Framework for Capturing and Converting CO2 into Cyclic Carbonates under Mild Conditions

“…All Pb−O bond lengths range from 2.440(5) to 2.739(5) Å, which are within a reasonable range. 57,58 In terms of TOPOS40 analysis, with the {Pb 10 } cluster, ligands I and II are simplified as a three-connected network with the Schlafli symbol of {3.4 5 }{3 2 .4 12 .5 6 .6 12 .7 2 .8 2 }{4 6 } (Figure 1e).…”

Nanoporous Metal–Organic Framework Adsorbent Constructed via Ligand Tailoring for Rare-Earth Metal Ion Recovery

“…Metal–organic frameworks (MOFs) have attracted promising interest in various fields due to their excellent designability and functionality. − Therein, some highly stable MOF-based adsorbents have been widely applied in water-phase adsorption for drugs, dyes, and ions. − Recently, the adsorption of RE metal ions (e.g., Dy 3+ , La 3+ , Sc 3+ , Eu 3+ , and Gd 3+ ) on MOFs was also reported. − However, this research commonly focuses on the adsorption of a single RE ion or two RE ions. To the best of our knowledge, broad-spectrum adsorbents for RE ions have rarely been reported to date.…”