The electrochemical advanced oxidation processes coupling of oxidants for organic pollutants degradation: A mini-review

Elimination of humic acid in water: comparison of UV/PDS and UV/PMS

Humic substances are polyelectrolytic macromolecules; their presence in water leads to many environmental problems without effective treatment. In this work, the elimination of humic acid (HA), a typical humic substance, has been examined through ultraviolet (UV) activation systems in the presence of peroxydisulfate (PDS) and peroxymonosulfate (PMS), respectively. The results indicated that 92.9% and 97.1% of HA were eliminated with rate constants of 0.0328 ± 0.0006 and 0.0436 ± 0.0011 min⁻¹ with 180 and 60 min treatment times at pH 6 and 3 when adding 3 and 1 mmol L⁻¹ oxidant during UV/PDS and UV/PMS, respectively; the corresponding electric energies per order were 0.0287 and 0.0131 kW h m⁻³. The HA removal was systematically investigated by varying different reaction parameters, including radical scavengers, persulphate dose, solution pH, and initial HA concentration, and by addition of various common ions. Moreover, the decomposition details were identified through the changes in the dissolved organic carbon, unique UV absorbances, and UV spectroscopic ratios. Furthermore, the destruction mechanism was verified by fluorescence spectroscopy, demonstrating that the HA structure was decomposed to small molecular fractions in the two UV/persulphate systems. In addition, the purification of HA by the two UV/persulphate processes was assessed in actual water matrices.

In this work, UV-activated persulphate treatment (UV/PDS and UV/PMS) was found to be an effective method for HA removal.

Nanostructured iron oxides stabilized by chitosan: using copper to enhance degradation by a combined mechanism

The H₂O₂ decomposition profile suggests a combined mechanism. Spherical-shaped materials were synthesized and facilitated the reuse process.

High-efficiency adsorption of tetracycline by the prepared waste collagen fiber-derived porous biochar

Porous biochar (PBC) derived from Cr-containing waste collagen fibers was prepared by two-step pyrolysis to 800 °C (PBC-800) and alkali activation.