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Deep eutectic solvents are utilized as green solvents to generate nanomaterials as they are less toxic and more cost-effective than conventional solvents. Contrary to a DES as a medium, metal-based DESs were employed as raw materials and media to fabricate one- or two-dimensional nanomaterials. FeO(OH) with a rod-bundle structure, Co(OH)2 with a plate-like structure, ZnO with a rod-like structure, and CuO with a wedge-like nanoplate have been successfully synthesized. A possible mechanism for formation is also discussed. Moreover, the nanomaterials obtained exhibit low band gaps compared to bulk materials, increasing their ability to degrade organic and inorganic pollutants effectively. According to electrochemical tests, Fe2O3 nanoparticles have a high specific capacity and cycle stability, making them promising anode materials for NiFe rechargeable batteries. [ABSTRACT FROM AUTHOR]

Cysteine‐functionalized Fe3O4 magnetic nanoparticles were synthesized by thiol‐ene click reaction and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier‐transform infrared spectroscopy (FT‐IR), X‐ray diffraction spectrometry (XRD), thermal gravimetric analysis (TGA), vibrating sample magnetometer (VSM), X‐ray photoelectron spectroscopy (XPS), specific surface area (BET) analysis and pore size distribution analysis. The obtained magnetic materials were employed as a magnetic solid phase extraction adsorbent combined with inductively coupled plasma‐atomic emission spectrometry (ICP‐AES) for determination of Cu2+. Several parameters affecting extraction efficiency, including eluent concentration, adsorption time, adsorbent amounts, and sample pH were investigated. Under the optimized conditions, the method was validated. Within the concentration range of 0.01–20 μg mL−1, The limit of detection (LOD) and the limit of quantification (LOQ) were determined to be 0.002 μg mL−1 and 0.007 μg mL−1, respectively. The adsorption percentage of Cu2+ ions remained above 87.0 % when the adsorption‐desorption data of Cu2+ ions through three cycles of the successive adsorption and desorption process. The results show that a reliable and rapid method was established for determination of Cu2+ ions. [ABSTRACT FROM AUTHOR]

Cysteine‐functionalized Fe3O4 magnetic nanoparticles were synthesized by thiol‐ene click reaction and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier‐transform infrared spectroscopy (FT‐IR), X‐ray diffraction spectrometry (XRD), thermal gravimetric analysis (TGA), vibrating sample magnetometer (VSM), X‐ray photoelectron spectroscopy (XPS), specific surface area (BET) analysis and pore size distribution analysis. The obtained magnetic materials were employed as a magnetic solid phase extraction adsorbent combined with inductively coupled plasma‐atomic emission spectrometry (ICP‐AES) for determination of Cu2+. Several parameters affecting extraction efficiency, including eluent concentration, adsorption time, adsorbent amounts, and sample pH were investigated. Under the optimized conditions, the method was validated. Within the concentration range of 0.01–20 μg mL−1, The limit of detection (LOD) and the limit of quantification (LOQ) were determined to be 0.002 μg mL−1 and 0.007 μg mL−1, respectively. The adsorption percentage of Cu2+ ions remained above 87.0 % when the adsorption‐desorption data of Cu2+ ions through three cycles of the successive adsorption and desorption process. The results show that a reliable and rapid method was established for determination of Cu2+ ions. [ABSTRACT FROM AUTHOR]

A ternary photocatalyst, Fe 3 O 4 -loaded g-C 3 N 4 /C-layered composite (g-C 3 N 4 /C/Fe 3 O 4 ) was fabricated by a facile sonication and in situ precipitation technique. Carbon nanosheets were prepared using the remaining non-metallic components of waste printed circuit boards as carbon sources. In this hybrid structure, g-C 3 N 4 was immobilized on the surfaces of carbon nanosheets to form a layered composite, and 10-15 nm Fe 3 O 4 nanoparticles are uniformly deposited on the surface of the composite material. The photocatalytic performance of the catalyst was studied by degrading tetracycline (TC) under simulated sunlight. The results showed that the photoactivity of the g-C 3 N 4 /C/Fe 3 O 4 composite to TC was significantly enhanced, and the degradation rate was 10.07 times higher than that of pure g-C 3 N 4 , which was attributed to Fe 3 O 4 nanoparticles and carbon nanosheets. Carbon sheets with good conductivity are an excellent electron transporter, which promotes the separation of photogenerated carriers and the Fe 3 O 4 nanoparticles can utilize electrons effectively as a center of oxidation-reduction. Moreover, a possible photocatalytic mechanism for the excellent photocatalytic performance was proposed., Competing Interests: The authors declare no competing financial interest., (© 2020 American Chemical Society.)