Huan-Ping Jing

Photocatalytic degradation of methylene blue in ZIF-8

Metal–organic frameworks (MOFs), a new class of porous crystalline materials, have attracted great interest as a promising candidate for sustainable energy and environmental remediation. In this study, ZIF-8, a versatile MOF based on imidazolate ligands, was selected as a photocatalyst to decompose methylene blue (MB) under UV light irradiation. The influence factors, kinetics, and mechanism of photocatalytic MB degradation and stability of ZIF-8, were also studied. The results revealed that the ZIF-8 photocatalyst exhibited efficiently photocatalytic activity for MB degradation under UV irradiation, which was confirmed through the detection of hydroxyl radicals (˙OH) by a fluorescence method. The MB degradation over the ZIF-8 photocatalyst followed a pseudo-first-order kinetics model. ZIF-8 worked effectively over a wide pH range from 4.0 to 12.0, and showed both high adsorption capacity and degradation efficiency for MB in a strong alkaline environment. The enhanced efficiency in a strong alkaline environment resulted from the higher charged ZIF-8 (pH > pHpzc) and the elevated yield of ˙OH facilitated by increased OH− concentration. The possible pathway of photocatalytic degradation of MB in ZIF-8 was proposed. The results indicated that ZIF-8 can be used as a highly efficient photocatalyst to decompose organic pollutants.

Three coordination compounds of cobalt with organic carboxylic acids and 1,10-phenanthroline as ligands: syntheses, structures and photocatalytic properties

Abstract Three cobalt-based coordination compounds, [Co2(phen)4(H2qptb)](H3qptb)2 (1), [Co2(phen)4(H2dczpb)2]·5H2O (2) and [Co2(phen)4(H2odpa)2(H2O)2]·2H2O (3), were obtained from mixtures of quaterphenyl-4,2″,5″,4′-tetracarboxylic acid (H4qptb), 3,4-dicarboxyl-(3′,4′-dicarboxylazophenyl) benzene (H2dczpb), 4,4′-oxydiphthalic acid (H2odpa), along with 1,10-phenanthroline (phen) and cobalt salts by hydrothermal synthesis. Single-crystal X-ray diffraction reveals that complexes 1–3 contain [Co2(phen)4(L)] units, further joined into 3D frameworks via hydrogen-bonding interactions. All three complexes display considerable thermal stability and exhibit selective absorption in the ultraviolet region, as shown by thermogravimetric analysis and UV–Vis diffuse reflectance spectroscopy, respectively. Complex 1 mediates efficient photocatalytic degradation of methylene blue under UV irradiation.

CCDC 1042981: Experimental Crystal Structure Determination

Related Article: Xiao-Xu Song, Chong-Chen Wang, Xue-Yan Xu, Huan-Ping Jing, Peng Wang, Shi-Jie Gao|2017|Transition Met.Chem.|42|181|doi:10.1007/s11243-017-0123-2

CCDC 1042968: Experimental Crystal Structure Determination

Related Article: Xiao-Xu Song, Chong-Chen Wang, Xue-Yan Xu, Huan-Ping Jing, Peng Wang, Shi-Jie Gao|2017|Transition Met.Chem.|42|181|doi:10.1007/s11243-017-0123-2