Optoelectronic applications with transparent conducting oxides have been made possible by modulating the carrier density of wide band gap oxides with doping. We demonstrate the modulation of the density of states (DOS) at the Fermi level in nanocrystalline CuAlO 2 particles synthesized using a sol–gel technique, as a function of doping with a magnetic impurity (Ni). This behavior is directly correlated with structural studies using X-ray diffraction and magnetic properties which show a similar trend. Our results can be understood in a picture where charge hopping occurs through surface or defect states, rather than by direct hopping between the quantum-confined states of the nanocrystal, and an increase in the DOS at the Fermi level caused by the substitution of Ni atoms at the Al site.

One of the biggest challenges of the modern world is the antibiotic pollution in the water resources owing to the lack of effective removal techniques in the conventional wastewater treatment processes. Importantly, very few commercially available adsorbents are at the same time porous, magnetic, and have the capacity to bind and remove particular antibiotic classes from the slurries in a selective manner. Herein we report CNS@ZIF67 heterostructure derived adsorbent for the pH‐dependent removal of ciprofloxacin (CIP). The materials can be synthesized via a simple two‐step wet chemical method followed by annealing in a controlled atmosphere. The material demonstrates an attractive surface‐to‐mass ratio of 203.02 m2 g−1. We have performed a detailed time dependent adsorption study indicating a high removal efficiency of 96% within 2 h. Experimental adsorption data matches the Langmuir isotherm model and the kinetics follows pseudo‐second‐order reaction kinetics suggesting a chemisorption pathway of adsorption kinetics. The adsorbent has an interesting pH dependent adsorption behavior towards CIP. The adsorbent has also demonstrated its value in being reusable for four cycles of adsorption and desorption without significantly changing the removal efficiency.

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A facile hydrothermal approach was used to synthesize a self-assembled tailored rod-shaped g-C3N4 anchored with molybdenum diselenide (MoSe2) flowers. Due to the presence of basic sites, MoSe2 can be loaded...

A rapid and accurate method for the determination of iron in the presence of copper is suggested on the basis of the photochemical reduction of iron with oxalate. Copper is not reduced. The reduced iron is titrated with standard sodium vanadate solution.