Photooxidative Degradation of Dye Pollutants Accumulated in Self‐Assembled Natural Polyelectrolyte Microshells under Visible Radiation

Abstract

A novel route to facilitate the degradation of dye pollutants, a class of well-known recalcitrant organic pollutants, is reported. This new approach is based on a natural polyelectrolyte microshell that was preformed by the alternate adsorption of the anionic alginate sodium (ALG) and the cationic chitosan (CHI) onto weakly cross-linked melamine formaldehyde (MF) colloidal particles, and the subsequent sacrifice of MF templates in 0.1 M HCl. The as-prepared microshells could accumulate rhodamine B (RhB) and fluorescein (Flu) efficiently in water under ordinary conditions by means of a simple mixing process. The photodegradation of the accumulated RhB and Flu was examined in the presence of Fe3+ and H2O2 under visible radiation. The accumulated RhB and Flu are rapidly degraded and the assembled shells maintain their intact spherical shape throughout the photoreaction process. Results of recycling degradation experiments and the photochemical behavior of the shells, as demonstrated by confocal laser scanning microscopy (CLSM), UV-visible spectroscopy, and scanning force microscopy (SFM), further suggest that the constructed shells may be used as environmentally friendly microcontainers for the elimination of dyes in wastewater.

Amino Acid-Assisted Hydrothermal Synthesis and Photocatalysis of SnO2 Nanocrystals

“…Semiconductor photocatalytic activity has attracted great interest due to their potential applications in the degradation of environmental pollutants and organic pollutant transformation. Dye pollutants in effluents from the textile and paper industries are regarded as a major environmental pollutants, because of their nonbiodegradability and toxicity . The degradation of RhB, an organic dye, in aqueous suspension is used as a probe reaction to evaluate the catalytic activity of semiconductor photocatalytic performance .…”

Rose Bengal‐Grafted Biodegradable Microcapsules: Singlet‐Oxygen Generation and Cancer‐Cell Incapacitation

“…[6][7][8] Recently, hydrophilic polyelectrolyte microcapsules, constructed by the layer-by-layer (LbL) self-assembly method, [9] have received particular attention as delivery vehicles for drug encapsulation and release due to their unique controllability of size, shape, and permeability, as well as large inner space capable of encapsulating drug molecules. [10,11] Some groups have applied microcapsules as photosensitive drug-delivery systems. BØdard et al [12] prepared a remote laser-responsive system by incorporating meso-tetrakis(4-sulfonatophenyl)porphin into microcapsule walls through an LbL self-assembly method.…”

Highly Efficient Degradation of Linear Alkylbenzene Sulfonate Surfactant by MIL‐53 (Fe) Metal Organic Framework Derived Electro‐Fenton Applicable in Water Treatments

“…All the above-mentioned advantages have made the Electro-Fenton process an efficient treatment method for removing drugs, [13,14] surfactants, [5] dyes, [15,16] phenol, [17] herbicides, [18,19] and… from water.…”