Flow photocatalysis system-based functionalized graphene oxide-ZnO nanoflowers for degradation of a natural humic acid

Enhanced photocatalytic activities of a hierarchical ZnO/V2C MXene hybrid with a close coupling heterojunction for the degradation of methyl orange, phenol and methylene blue dye

“…Secondly, the crystal structure of ZnO is usually composed of [ZnO 4 ] tetrahedra including Zn 2+ and O 2À , which are arranged in a plane and then piled in an orderly manner along the c-axis direction. [7][8][9][10] In this experiment, zinc acetate dihydrate as the zinc source provided Zn 2+ ions, and C 6 H 12 N 4 was employed to slowly provide OH À ions and control the growth of ZnO crystals. Upon adjusting the hydrothermal temperature and time, ZnO crystals grew up into nanosheets with a two-dimensional structure.…”

“…Due to its high photosensitivity, high electron mobility, excellent photoelectric properties, low cost, and extremely low toxicity, [6][7][8] ZnO has attracted wide attention in the photodegradation of organic dye pollutants. However, the agglomeration phenomenon of nano-ZnO materials, 9,10 the few active sites on its surface, 11,12 and the high recombination rate of internal photogenerated electron-hole pairs limit its practical application in photocatalytic degradation. 13,14 To solve these shortcomings, the co-catalyst modification of ZnO photocatalysts is considered to be an effective method to improve the photocatalytic performance by promoting the effective separation of photo-induced charges.…”

“…Due to its high photosensitivity, high electron mobility, excellent photoelectric properties, low cost, and extremely low toxicity, 6–8 ZnO has attracted wide attention in the photodegradation of organic dye pollutants. However, the agglomeration phenomenon of nano-ZnO materials, 9,10 the few active sites on its surface, 11,12 and the high recombination rate of internal photogenerated electron–hole pairs limit its practical application in photocatalytic degradation. 13,14…”

Efficient removal of humic acid in water using a novel TiO2 composite with biochar doping

“…4, within the 3-11 pH range, the higher the pH value of the solution, the lower the HA removal on Ti-C due to the weak contact ability of humic acid molecules and Ti-C under alkaline conditions. 6 The HA removal rate was around 50% at pH 3.0, 21.3% at initial pH (7.2) and only 4.0% at pH 11.0 in the solution. The removal rate obviously increased ca.…”

“…5 Excessive HA is proved to cause severe water pollution and could form certain carcinogens such as disinfection by-products (DBPs) and trihalomethanes (THMs) during chlorination and disinfection in water treatment plants (WTPs). 6 Extensive research has demonstrated that HA will chelate with metal ions, thus making it unfavorable to treat heavy metal ions. 7 HA can further enhance the stability of colloidal particles and reduce the coagulation effect.…”