Abstract：
:Wood-based biochar, as a metal-free heterogeneous activator of peroxydisulfate (PDS), was successfully prepared by pyrolysis of polar sawdust for efficient removal of Acid Orange 7 (AO7). The results demonstrate PDS could be effectively activated by wood-based biochar, and AO7 was rapidly eliminated in a wide range of pH value (3.0-10.0) with AO7 removal achieved ≥ 99.3% after 14 min reaction. The dominant reactive species in the biochar/PDS system were verified via radical quenching tests and electron paramagnetic resonance (EPR) technique. It is speculated that sulfate radicals (SO4•-) and hydroxyl radicals (•OH) were formed on the surface of biochar. Based on the results of X-ray photoelectron spectroscopy (XPS), π-electron density and oxygen-containing functional groups (especially C-OH) on biochar surface were active centers for the catalytic reaction. Recycle experiments of biochar for 4 runs were carried out and the regeneration method of the catalyst was also studied.
journal_name
Chemospherejournal_title
Chemosphereauthors
Zhu K,Wang X,Chen D,Ren W,Lin H,Zhang Hdoi
10.1016/j.chemosphere.2019.05.087subject
Has Abstractpub_date
2019-09-01 00:00:00pages
32-40eissn
0045-6535issn
1879-1298pii
S0045-6535(19)30989-0journal_volume
231pub_type
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