Photoreduction of 4-nitrophenol and Cr (VI) using ZnS/ZnO-tubes synthesized with hexamethylenediamine

The presence of toxic substances constitutes an environmental problem and even affects health. To evaluate the photoreduction of 4-nitrophenol (4-NF) and Cr(VI), both highly polluting substances, two Zn materials synthesized by the precipitation method; ZnS (Zinc Sulfide) and ZnS/ZnO-tubes (Zinc Sulfide deposited on Zinc Oxide tubes) have been used. The ZnS/ZnO-tubes assisted photoreduction of 4-NP to 4-aminophenol (4-AP) exhibits pseudo-first order kinetics with a rate constant of 0.1476 min−1 and a yield of 90