Removal of phenol by acid-washed zero-valent aluminium in the presence of H2O2

Currently, organic pollution is becoming increasingly severe with continued industrialization. In this study, the characterization of acid-washed zero-valent aluminium (AW-ZVAl) and the mechanism of using AW-ZVAl/Air/H + system in the presence of H 2 O 2 to remove phenol were investigated. The influencing factors including acid washing time, AW-ZVAl concentration, pH, H 2 O 2 concentration, air or N 2 conditions, and humic acid (HA) on phenol removal were studied. AW-ZVAl exhibited a greater capacity to remove phenol than that of ZVAl. In the presence of 4.0   mM H 2 O 2 , the phenol concentration decreased from initial 20.0   mg/L to 0.3   mg/L by 6.0   g/L AW-ZVAl in 3   h at initial pH 2.7. The addition of H 2 O 2 into AW-ZVAl/Air/H + system facilitated the reaction due to the enhancement of hydroxyl radicals generation, while the addition of HA inhibited the reaction due to the competitive reaction of HA and phenol with hydroxyl radicals. The reusing of AW-ZVAl showed that the AW-ZVAl was consistently effective in 5 cycles. The removal mechanism of phenol in the AW-ZVAl/Air/H + and AW-ZVAl/N 2 /H + were discussed. This study demonstrates that AW-ZVAl has a great potential to be applied in treating wastewater containing organic pollutants.