•Durian-shaped magnetic porous UiO-66 composites (MSU(Zr)) were prepared.•MSU(Zr) show highly equilibrium adsorption capacity for nitrophenol.•The recycling adsorption-desorption performance could be adjust with pH.Highly effective decontamination of nitrophenols from aqueous solution is a challenge for public health and ecosystem protection. Here we report the assembly of UiO-66 onto Fe3O4 particles by solvothermal method, formed durian-shaped magnetic porous composites (MSU(Zr)) with multi-core-shell structure. The weight ratio of UiO-66 shells and the Fe3O4 multi-core is about 6:4. MSU(Zr) performed well on 2-nitroresorcinol (NRC) adsorption, which could be attributed to the highly porosity and the nature of Lewis base of Zr6O4(OH)4 clusters. The equilibrium adsorption capacity for NRC is more than 200 mg g−1, which means that each Zr6O4 centre can uptake more than three NRC molecules (MSU(Zr)·3NRC). Kinetic parameters follow pseudo-second-order kinetics and Langmuir isotherm. pH value plays a significant role on NRC adsorption, which is more favor at acidic condition. It’s remarkable that the reversible adsorption-desorption performance could be adjust with pH. The reusability of MSU(Zr) shows a good recyclability that the adsorption capacity is still more than 180 mg g−1 after five regeneration cycles.A new durian-shaped magnetic porous Fe3O4@SiO2@UiO-66 composites (MSU(Zr)) was prepared and applied in removal of nitroresorcinol (NRC) from aqueous solution. MSU(Zr) performs well on NRC adsorption, the equilibrium adsorption capacity is more than 200 mg g−1 (MSU(Zr)·3NRC). pH value plays a significant role on NRC adsorption, which is more favor at acidic condition. It's remarkable that the recycling adsorption-desorption performance could be adjust with pH. The combination of magnetic separation with MOFs is attractive way for efficient and renewable removal of nitrophenol from waste water.Download high-res image (94KB)Download full-size image

A novel visible-light-driven heterobimetallic cluster {[WOS3Cu3Br(bip)2.5]·H2O}n (bip = 4,4′-bis(imidazol-1-yl)phenyl) (1) photocatalyst was successfully synthesized under hydrothermal condition, via the partial substitution of bromine of the precursor cluster [WOS3Cu3Br6]+ with 4,4′-bis(imidazol-1-yl)phenyl. The obtained two-dimensional polymer with unprecedented double layers was constructed from incomplete cubane-like cluster serving as a 5-connected node [WOS3Cu3]+ and linear bridging ligand 4,4′-bis(imidazol-1-yl)phenyl. The photocatalytic activity of 1 was firstly investigated under visible light irradiation in the presence of H2O2 by monitoring the photodegradation of methylene blue (MB), which shows effective photocatalytic performance.A novel visible-light-driven heterobimetallic cluster {[WOS3Cu3Br(bip)2.5]·H2O}n (bip=4,4′-bis(imidazol-1-yl)phenyl) (1) photocatalyst was successfully synthesized under hydrothermal condition, via the partial substitution of bromine of the precursor cluster [WOS3Cu3Br6]+ with bip. The obtained two-dimensional polymer with unprecedented double layers was constructed from incomplete cubane-like cluster serving as a 5-connected node [WOS3Cu3]+ and linear bridging ligand 4,4′-bis(imidazol-1-yl)phenyl. 1 shows effective photocatalytic performance for degradation of methylene blue under visible light irradiation in the presence of H2O2.Download high-res image (98KB)Download full-size image

•Flower-like core-shell Fe3O4@MnO2 composites were successfully prepared by hydrothermal method.•Fe3O4@MnO2 composites could selective removal of Congo red from aqueous solution involving various dyes.•The maximum removal rate of Congo red was up to 95%.Flower-like core-shell MnO2-coated magnetic composites (Fe3O4@MnO2) were prepared via a simple hydrothermal process. The particle size of Fe3O4@MnO2 composites is in the range of 300–400 nm with a flower-like amorphous MnO2 shell. Congo red can be selective removal by Fe3O4@MnO2 composites from aqueous solution involving various dyes (Congo red (CR), methylene blue (MB), methyl orange (MO), crystal violet (CV), and rhodamine B (RB)), which benefits from the interactions between the positive charged surface of Fe3O4@MnO2 composites and anionic dye molecules. The maximum removal rate of CR was 95% (wt%) and larger than that of other dyes (< 15%).Flower-like core-shell MnO2-coated magnetic composites (Fe3O4@MnO2) were prepared via a simple hydrothermal process. Fe3O4@MnO2 composites could selective removal of Congo red from aqueous solution involving various dyes (Congo red (CR), methylene blue (MB), methyl orange (MO), crystal violet (CV), and rhodamine B (RB)). The maximum removal rate of CR was 95% (wt%) and larger than that of other dyes (< 15%).Download high-res image (130KB)Download full-size image

Five new isomorphic coordination polymers of the Co(II) ion, namely, {[Co2L(bpy)0.5(H2O)2]·2H2O}n (1), {[Co2L(pbyb)0.5(H2O)2]·3H2O}n (2), {[Co2L(dpe)0.5(H2O)2]·2H2O}n (3), {[Co2L(dpa)0.5(H2O)2]·2.5H2O}n (4), and {[Co2L(dip)0.5(H2O)2]·3.5H2O}n (5) (H4L = cis,cis,cis,cis-1,2,3,4-cyclopentaneteracarboxylic acid, bpy = 4,4′-bipyridine, pbyb = 1,4-di(pyridine-4-yl)benzene, dpe = 1,2-di(pyridine-4-yl)ethane, dpa = (E)-1,2-di(pyridin-4-yl)diazene, and dip = 1,4-di(1H-imidazol-1-yl)benzene), have been synthesized under hydrothermal conditions. The L4– ligand maintains its original conformation of SSRR in all of these compounds, but {Co5L}n clusters show mirror coordination symmetry in 1, 2, and 4 while the clusters in 3 and 5 do not. The addition of different N-ligands can tune the distance between {Co2L}n layers and change the pore structures of the frameworks. Magnetic susceptibility measurements indicate that 1–5 exhibit antiferromagnetic behavior.

•Fe3O4@MIL-100(Fe) composites with core-shell structure were successfully prepared through a simple method.•The influence factors on Cr(VI) adsorption by Fe3O4@MIL-100(Fe) were investigated.•Cr(VI) can efficiently adsorbed by Fe3O4@MIL-100(Fe) composites from aqueous solution.Facile regeneration of an adsorbent is very important for commercial feasibility. One typical highly porous metal-organic framework (MOF) materials based on MIL-100(Fe) and magnetic iron oxide particles (denoted as MMCs) with diameter about of 350 nm were successfully synthesized. The growth of MIL-100(Fe) shell on the surface of Fe3O4 was utilized precursor as crystal seed via in-situ step hydrothermal reaction. It is a simple way to obtain well organized core-shell MOF composites, compared to the step-by-step method. MMCs were firstly used to uptake of Cr(VI) anions in aqueous solution. Adsorption experiments were carried out in batch sorption mode investigating with the factors of contact time (0–1000 min), pH (from 2 to 12), dose of adsorbent (4–25 mg), and initial Cr(VI) concentration (range from 10 to 100 ppm).One typical highly porous metal-organic framework (MOF) materials based on MIL-100(Fe) and magnetic iron oxide particles (denoted as MMCs) were successfully synthesized. Utilizing Fe3O4 precursor as crystal seed to grow MIL-100(Fe) shell by in-situ step hydrothermal reaction. It is a simple way to obtain core-shell MOF composites. MMCs could effectively uptake of Cr(VI) anions in aqueous solution.