1,2 These discharged polluting dyes can seriously harm human health and all levels of natural ecosystems. According to statistics, nearly 200 billion liters of hardy biodegradable colored wastewater are produced every year.

Introduction Dye pollution from the textile industry has become an increasingly serious environmental problem. Electron paramagnetic resonance and photoluminescence experiments confirmed this inference. The heterojunction prevented excessive electrons and holes (e − and h +) recombination, stabilizing the reactive active substance of hydroxyl in the photo-Fenton-like catalytic system. The catalytic system can also stably degrade MB under dark conditions, where the MB degradation was almost 82% after 60 min. The MB degradation efficiency in the CC-G-20/H 2O 2/visible light system was almost 98.3% after 60 min, which is higher than those of the parent materials (g-C 3N 4, 12.7% CC, 58.6%) and had cyclic stability. The composite material prepared using this combination (CC-G-20) exhibited the best MB degradation performance.

The mass of g-C 3N 4 constituted 20% of the mass of the Cu 2O soft template. The suitable amount of g-C 3N 4 hybridization was selected according to the degradation efficiency. Photo-Fenton degradation experiments proved that in the presence of hydrogen peroxide (H 2O 2), a small amount of g-C 3N 4 hybridization on Cu-based Fenton catalysts significantly improved methylene blue (MB) degradation. Herein, a CuSe(Cu 2Se) yolk–shell structure (CC) was synthesized when room temperature was 25 degree Celsius using Cu 2O as a soft template, and the g-C 3N 4/CuSe(Cu 2Se) heterojunction (CC-G) was formed by coupling appropriate amounts of g-C 3N 4 in the selenization process to provide a novel, green, economical, and efficient photo-Fenton catalytic material.

Works of Darkness by V.B. Tenery