Removal Of Humic Acid And Cr(Vi) From Water Using Zno-30n-Zeolite

The mutual influence of humic acid and Cr(VI) on water purification using ZnO-30N-zeolite was investigated in the laboratory. The removal of humic acid by ZnO-30N-zeolite with both pollutants present reached 90% in 5 min. With humic acid alone, more than one day was required to reach the same level of removal. Synergy between humic acid and chromium was thus demonstrated in their removal process by ZnO-30N-zeolite. However, the presence of humic acid showed no obvious effect on the removal capacity of Cr(VI) by ZnO-30N-zeolite. X-ray photoelectron spectra showed that Cr(VI) was reduced to Cr(III) in the process by both humic acid and ZnO-30N-zeolite. The kinetic mechanism of synergistic removal of humic acid and Cr(VI) by ZnO-30N-zeolite in binary pollutant system was also proposed. (C) 2021 Elsevier Ltd. All rights reserved.