Polydispersed CoP nanoparticles in an orthorhombic phase were synthesized via a gas−solid reaction and then deposited over graphitic carbon nitride to build the CoP/g-C 3 N 4 (CoP−CN) heterostructure. Nanorod-like CoP nanoparticles with a length of 10−80 nm were connected to g-C 3 N 4 nanosheets to build an intimate face-to-face contact via their crystal planes of ( 011) and ( 211). This unique heterojunction hybrid exhibits superior photocatalytic and photoelectrochemical performances for H 2 evolution and photoelectrochemical response plus excellent overall water-splitting activity. The optimal sample of 3% CoP−CN composite achieved a superior hydrogen production rate at 1038.1 μmol h −1 g −1 when irradiated by simulated solar light, exhibiting a much higher photocurrent at 150 μA cm −2 compared to pure g-C 3 N 4 . Also, a larger anodic current density was detected during the photoelectrochemical hydrogen evolution reactions (PEC HERs) with enhanced applied bias photon-to-current efficiency, denoting a higher efficiency for PEC HER. The enhancements for photocatalytic and PEC HER activity are mainly attributed to the formation of intimate interfacial contact for better light absorption, stronger photoreductive potentials, and higher efficiency for charge separation and transfer. This study provides a proof-of-concept design and construction of effective cobalt-phosphide-based heterojunctions for hydrogen evolution and water-splitting applications.

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Mono-ethylene glycol (MEG), used in the oil and gas industries as a gas hydrate inhibitor, is a hazardous chemical present in wastewater from those processes. Metal-organic frameworks (MOFs) (modified UiO-66 and UiO-66-2OH) were used for the effective removal of MEG waste from effluents of distillation columns (MEG recovery units). Batch contact adsorption method was used to study the adsorption behavior toward these types of MOFs. Adsorption experiments showed that these MOFs had very high affinity toward MEG. Significant adsorption capacity was demonstrated on UiO-66-2OH and modified UiO-66 at 1000 mg·g and 800 mg·g respectively. The adsorption kinetics were fitted to a pseudo first-order model. UiO-66-2OH showed a higher adsorption capacity due to the presence of hydroxyl groups in its structure. A Langmuir model gave the best fitting for isotherm of experimental data at pH = 7.

Due to the fact that traditional heavy metal‐based catalysts toward wastewater treatment could cause the problem of secondary contamination, it is imperative to seek for more eco‐friendly catalysts to address this tricky issue. Recently, numerous novel metal‐based heterogeneous catalysts, especially perovskite oxides, have been widely investigated for the activation of peroxymonosulfate (PMS), which is significant in the removal of organic pollutants. Here, we report a novel perovskite oxide (La0.7Sr0.3)CoO3‐δ (LSC)‐based 3D ceramic hollow fiber catalyst for aqueous‐phase advanced oxidation. Through it cooperating with PMS, the methylene blue (20 ppm) can be completely degraded only about 30 minutes. The mechanism of advanced oxidation process is explored via the electron paramagnetic resonance test on the active species. In addition, it also displays high activity for the degradation of other pollutes, such as tetrabromobisphenol A and rhodamine B. This study provides a new strategy to effectively degrade contaminant via introducing 3D ceramic catalysts.

With increasingly severe air pollution brought by volatile organic compounds (VOCs), the search for efficient adsorbents toward VOC removal is of great significance. Herein, an adenine-based metal–organic framework, namely, bio-MOF-11 [Co2(ad)2(CH3CO2)2·0.3EtOH·0.6H2O, ad = adeninate], was synthesized via a facile method, and its VOC adsorption was reported for the first time. This novel bio-MOF-11 was investigated by employing four common VOCs (i.e., methanol, acetone, benzene, and toluene) as adsorbates. The saturated adsorption capacity of these targeted VOCs on bio-MOF-11 was estimated to be 0.73–3.57 mmol/g, following the order: toluene < benzene < acetone < methanol. Furthermore, with the adsorption temperature increasing from 288 to 308 K, the saturated adsorption capacity was reduced by 7.3–35.6%. It is worth noting that acetone adsorption is most sensitive to temperature ascribed to its low boiling point and strong polar nature. Meanwhile, owing to the molecular sieve effect, the adsorption capacity appears negatively correlated to the size of VOC molecules. Besides, the abundant exposed nitrogen atoms and amino groups in bio-MOF-11 cavities facilitate the adsorption of polar VOC molecules. This work promotes the fundamental understanding and practical application of bio-MOF for adsorptive removal of VOCs.

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