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Herein, for the first time, a direct Z-scheme g-C 3 N 4 /NiFe 2 O 4 nanocomposite photocatalyst was prepared using facile one-pot hydrothermal method and characterized using XRD, FT-IR, DRS, PL, SEM, EDS, TEM, HRTEM, XPS, BET and VSM characterized techniques. The result reveals that the NiFe 2 O 4 nanoparticles are loaded on the g-C 3 N 4 sheets successfully. The photocatalytic activities of the as-prepared photocatalysts were evaluated for the degradation of methyl orange (MO) under visible light irradiation. It was shown that the photocatalytic activity of the g-C 3 N 4 /NiFe 2 O 4 nanocomposite is about 4.4 and 3 times higher than those of the pristine NiFe 2 O 4 and g-C 3 N 4 respectively. The enhanced photocatalytic activity could be ascribed to the formation of g-C 3 N 4 /NiFe 2 O 4 direct Z-scheme photocatalyst, which results in efficient space separation of photogenerated charge carriers. More importantly, the as-prepared Z-scheme photocatalyst can be recoverable easily from the solution by an external magnetic field and it shows almost the same activity for three consecutive cycles. Considering the simplicity of preparation method, this work will provide new insights into the design of high-performance magnetic Z-scheme photocatalysts for organic contaminate removal.

A tetranuclear dysprosium Schiff base complex was isolated by reacting dysprosium chloride with 2-hydroxy-3-methoxybenzaldehyde and 2-(aminomethyl)pyridine in-situ under basic conditions. The isolated Dy(III) complex was characterized by elemental analyses, single crystal X-ray diffraction and molecular spectroscopy. The complex crystallizes in the triclinic space group P-1 with unit cell parameters of a = 10.2003 (4), b = 13.8602 (5), c = 14.9542 (6), α = 94.523 (3), β = 109.362 (4), and γ = 99.861 (3). The magnetic properties of 1 have been investigated by DC and AC susceptibility measurements. The DC measurements reveal weak exchange coupling of antiferromagnetic nature. In the AC measurement, the complex shows a slow relaxation of magnetization in the absence of an external magnetic field.

Células fotoeletroquímicas (PECs) têm sido fabricadas usando a forma base esmeraldina de polianilina (EB) como um material fotoativo e o par redox Eu 2+ /Eu 3+ em metanol como eletrólito. Uma célula fotoeletroquímica com a estrutura: Vidro/ITO/ EB:Nc-TiO 2 /Eletrólito/ Pt produz uma voltagem de circuito-aberto (V OC ) de -0,132 V e uma corrente de curto-circuito (I SC ) de 0,64 µA cm -2 sob 50 mW cm -2 de iluminação com luz branca de lâmpada de Xe. Num esforço para aumentar a foto-resposta, uma PEC com estrutura: Vidro/ITO/ EB:Nc-TiO 2 / Eletrólito/Pt foi construída, na qual um filme composto de EB e TiO 2 (Nc-TiO 2 ) nanocristalino é usado como material fotoativo. A célula mostra uma V OC de -0,205 V e uma I SC de 105 µA cm -2 quando iluminada sobre as mesmas condições.Photoelectrochemical cells (PECs) have been fabricated using the emeraldine base form of polyaniline (EB) as a photoactive material and Eu 2+ /Eu 3+ redox couple in methanol as an electrolyte. A PEC with a structure: Glass/ITO/EB/electrolyte/Pt produces an open-circuit voltage (V OC ) of -0.132 V and a short-circuit current (I SC ) of 0.64 µA cm -2 under 50 mW cm -2 white light illumination from Xe lamp. In an effort to increase the photoresponse, a PEC with a structure: Glass/ITO/EB:Nc-TiO 2 /Electrolyte/Pt has been devised in which a composite film of EB and nanocrystalline TiO 2 (Nc-TiO 2 ) is used as a photoactive material. The cell shows a V OC of -0.205 V and an I SC of 105 µA cm -2 when illuminated under the same conditions.

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