Flower-like ZnO hollow microspheres on ceramic mesh substrate for photocatalytic reduction of Cr(VI) in tannery wastewater
Source abstract
Abstract
Abstract Flower-like ZnO hollow microspheres were synthesized on flexible ceramic mesh substrate using a simple and economical hydrothermal technique and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The photocatalytic reduction of Cr(VI) in leather tannery wastewater by flower-like ZnO hollow microspheres was evaluated under ultraviolet light irradiation for the first time. The addition of different organics and pH value of the reaction solution played important roles in the photocatalytic reduction of Cr(VI). In addition, UV radiation intensity and catalyst content were critical parameters in the photocatalytic reduction process and their effects were also investigated. Under the optimal conditions, ZnO hollow microspheres exhibited excellent removal efficiency of Cr(VI) (~86%) and good photocatalytic stability. Moreover, more than 24% biochemical oxygen demand (BOD 5 ), 32% chemical oxygen demand (COD) and 30% total organic carbon (TOC) of tannery wastewater were reduced significantly after only 180 min of exposure to the UV lamp. It shows much promise to be an attractive photocatalyst for photocatalytic application.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Advanced Nanomaterials in Catalysis · Nanomaterials for catalytic reactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (44)
Show source-provided references
1. Photocatalytic reduction of Cr(VI) on the new hetero-system CuCr2O4/ZnO10.1016/j.molcata.2011.10.026 ↗
2. Photocatalytic treatment of metoprolol with B-doped TiO2: effect of water matrix, toxicological evaluation and identification of intermediates10.1016/j.apcatb.2015.04.007 ↗
3. A review of chemical, electrochemical and biological methods for aqueous Cr (VI) reduction10.1016/j.jhazmat.2012.04.054 ↗
4. Visible light induced photocatalytic reduction of Cr(VI) over polymer-sensitized TiO2 and its synergism with phenol oxidation10.1016/j.watres.2012.01.046 ↗
5. Synthesis and enhanced Cr(VI) photoreduction property of formate anion containing graphitic carbon nitride10.1021/jp3115226 ↗
6. Efficient photocatalytic reduction of aqueous Cr (VI) over flower-like SnIn4S8 microspheres under visible light illumination10.1016/j.jhazmat.2012.10.062 ↗
7. Photocatalytic reduction of Cr(VI) on WO3 doped long TiO2 nanotube arrays in the presence of citric acid10.1016/j.apcatb.2009.11.002 ↗
8. Facile synthesis of amino-functionalized titanium metal-organic frameworks and their superior visible-light photocatalytic activity for Cr(VI) reduction10.1016/j.jhazmat.2014.11.039 ↗
9. Morphology controlled synthesis of SnS2 nanomaterial for promoting photocatalytic reduction of aqueous Cr(VI) under visible light10.1021/la500509c ↗
10. Activated carbon processes for the treatment of chromium (VI)-containing industrial wastewaters
11. Chromium removal by combining the magnetic properties of iron oxide with adsorption properties of carbon nanotubes10.1016/j.watres.2011.01.012 ↗
12. Synthesis of ordered large-pore mesoporous carbon for Cr (VI) adsorption10.1016/j.materresbull.2011.05.009 ↗
13. Surface-modified phanerochaete chrysosporium as a biosorbent for Cr (VI)-contaminated wastewater10.1016/j.jhazmat.2010.12.123 ↗
14. Modeling and optimization of voltage and treatment time for electrocoagulation removal of hexavalent chromium10.1016/j.desal.2010.10.055 ↗
15. Evaluation of Amberlite IRA96 and Dowex 1×8 ion-exchange resins for the removal of Cr (VI) from aqueous solution10.1016/j.cej.2010.04.059 ↗
16. Application of porous N-methylimidazolium strongly basic anion exchange resins on Cr (VI) adsorption from electroplating wastewater10.1080/01496395.2011.622331 ↗
17. Kinetic study of chromium (VI) facilitated transport through a bulk liquid membrane using tri-n-butyl phosphate as carrier10.1016/j.cej.2008.12.009 ↗
18. Removal of hexavalent chromium by membrane-based hybrid processes10.1021/ie070592v ↗
19. Rapid microwave-assisted synthesis of hierarchical ZnO hollow spheres and their application in Cr (VI) removal10.1088/0957-4484/23/23/235604 ↗
20. Photocatalytic reduction of hexavalent chromium with illuminated ZnO/TiO2 composite10.1016/j.jiec.2014.07.025 ↗
21. Mesoporous yolk-shell SnS2-TiO2 visible photocatalysts with enhanced activity and durability in Cr (vi) reduction10.1039/c2nr33755j ↗
22. Photocatalytically enhanced Cr (VI) removal by mixed oxides derived from MeAl (Me: Mg and/or Zn) layered double hydroxides10.1016/j.apcatb.2013.04.053 ↗
23. Photogenerated electron reservoir in hetero-p-n CuO-ZnO nanocomposite device for visible-light-driven photocatalytic reduction of aqueous Cr (VI)10.1039/C4TA04526B ↗
24. Photo-reduction of hexavalent chromium in aqueous solution in the presence of zinc oxide as semiconductor catalyst10.1016/j.cej.2009.06.021 ↗
25. Photocatalytically enhanced Cr (VI) removal by mixed oxides derived from MeAl (Me: Mg and/or Zn) layered double hydroxides10.1016/j.apcatb.2013.04.053 ↗
26. Facile synthesis of porous single crystalline ZnO nanoplates and their application in photocatalytic reduction of Cr (VI) in the presence of phenol10.1016/j.jhazmat.2014.05.059 ↗
27. Facile synthesis of amino-functionalizedtitanium metal-organic frameworks and their superior visible-light photocatalytic activity for Cr(VI) reduction10.1016/j.jhazmat.2014.11.039 ↗
28. Facile synthesis of gC3N4/ZnO composite with enhanced visible light photooxidation and photoreduction properties10.1016/j.cej.2012.08.033 ↗
29. Heterojunction nanowires of AgxZn1−xO-ZnO photocatalytic and antibacterial activities under visible-light and dark conditions10.1021/jp510259j ↗
30. Synthesis, characterization, and photocatalytic activity of Au-ZnO nanopyramids10.1039/C5TA01344E ↗
31. Self-assembled 3D flowerlike iron oxide nanostructures and their application in water treatment10.1002/adma.200600504 ↗
32. Mesoporous yolk-shell SnS2-TiO2 visible photocatalysts with enhanced activity and durability in Cr (VI) reduction10.1039/c2nr33755j ↗
33. Facile fabrication of α-FeOOH nanorod/RGO composite: a robust photocatalyst for reduction of Cr (VI) under visible light irradiation10.1039/C4TA00931B ↗
34. Fabrication of CuO-ZnO nanowires on a stainless steel mesh for highly efficient photocatalytic applications10.1039/c0cc04985a ↗
35. Standard Methods for the Examination of Water and Wastewater, 21st ed., American Public Health Association/American Water Works Association/Water Pollution Control Federation, Washington, DC, USA, 2005.
36. Chinese National Standard Methods, Water Quality-Determination of Biochemical Oxygen Demand after 5 days (BOD5) for Dilution and Seeding Method, HJ 505, 2009.
37. Efficient photocatalytic reduction of aqueous Cr (VI) over flower-like SnIn4S8 microspheres under visible light illumination10.1016/j.jhazmat.2012.10.062 ↗
38. Stacking-order-dependent optoelectronic properties of bilayer nanofilm photodetectors made from hollow ZnS and ZnO microspheres10.1002/adma.201202749 ↗
39. ZnO hollow-sphere nanofilm-based high-performance and low-cost photodetector10.1002/smll.201100694 ↗
40. Photocatalytic reduction of Cr (VI) on WO3 doped long TiO2 nanotube arrays in the presence of citric acid10.1016/j.apcatb.2009.11.002 ↗
41. Laser-induced efficient reduction of Cr (VI) catalyzed by ZnO nanoparticles10.1016/j.jhazmat.2011.01.007 ↗
42. Comparison of dye photodegradation and its coupling with light-to-electricity conversion over TiO2 and ZnO10.1021/la902117c ↗
43. Surface modification of ZnO with Ag improves its photocatalytic efficiency and photostability10.1016/j.jphotochem.2010.06.032 ↗
44. Facile synthesis of porous single crystalline ZnO nanoplates and their application in photocatalytic reduction of Cr (VI) in the presence of phenol10.1016/j.jhazmat.2014.05.059 ↗