The removal of toxic dyes and insoluble oil from wastewater is a hot topic in both academic and industrial fields. Herein, we report a cationic absorbent poly­(epichlorohydrin)–ethylenediamine hydrogel (PEE-Gel) via a simple one-step copolymerization and it can be successfully used for the removal of toxic dyes and insoluble oil from wastewater. The adsorption toward anionic dyes shows high efficiency and high selectivity at a wide pH range (from 2 to 12). The adsorption capacity at low equilibrium concentration (10 mg L–1) is as high as 1411.4 mg g–1 which is very close to the maximum adsorption capacity (1540.19 mg g–1). The adsorption of dye molecules onto PEE-Gel is very steady and can be difficult to be regenerated. The PEE-Gel with full dye adsorption (PEE-Gel-Dye) shows superoleophobicity under water, and PEE-Gel-Dye can be reused to separate toluene-in-water emulsion with high efficiency and durability. These results suggest that PEE-Gel is a promising and competitive candidate for water purification.

The development of high-efficiency catalysts for hydrogen evolution via water splitting has been an effective strategy to solve the energy environmental problems and energy crisis. The abundant-reserving transition metals and their phosphides are becoming attractive Pt alternatives for hydrogen evolution reaction (HER). Herein, a crystalline/amorphous Co/CoP film was facilely prepared on nickel foam (NF) by a one-step electrodeposition technique at room temperature, named Co/CoP-NF. The as-prepared Co/CoP-NF electrocatalyst exhibits excellent electrocatalytic activity for HER, on par with Pt/C, showing a low overpotential of 35 mV at a current density of 10 mA·cm and small Tafel slope of 71 mV·dec in 1.0 M NaOH solution. More importantly, the Co/CoP-NF catalyst presents good long-term durability at an overpotential of 60 mV. Moreover, the influence of the electrodeposition parameters on the catalytic performance of the catalyst was discussed. This study offers an effective strategy to develop a non-noble-metal HER catalyst for industrial production of hydrogen.

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