Enhancing acid orange II degradation in ozonation processes with CaFeO nanoparticles as a heterogeneous catalyst

This study used CaFe 2 O 4 nanoparticles as a catalyst for ozonation processes to degrade Acid Orange II (AOII) in aqueous solution. The study compared heterogeneous catalytic ozonation (CaFe 2 O 4 /O 3 ) with ozone treatment alone (O 3 ) at different pH values (3-11), catalyst dosages (0.25-2.0 g L...

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Veröffentlicht in:RSC advances 2023-10, Vol.13 (41), p.28753-28766
Hauptverfasser: Van, Huu Tap, Hoang, Van Hung, Luu, Thi Cuc, Vi, Thuy Linh, Nga, Luong Thi Quynh, Marcaida, Gio Serafin Ivan Jimenez, Pham, Truong-Tho
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container_end_page 28766
container_issue 41
container_start_page 28753
container_title RSC advances
container_volume 13
creator Van, Huu Tap
Hoang, Van Hung
Luu, Thi Cuc
Vi, Thuy Linh
Nga, Luong Thi Quynh
Marcaida, Gio Serafin Ivan Jimenez
Pham, Truong-Tho
description This study used CaFe 2 O 4 nanoparticles as a catalyst for ozonation processes to degrade Acid Orange II (AOII) in aqueous solution. The study compared heterogeneous catalytic ozonation (CaFe 2 O 4 /O 3 ) with ozone treatment alone (O 3 ) at different pH values (3-11), catalyst dosages (0.25-2.0 g L −1 ), and initial AOII concentrations (100-500 mg L −1 ). The O 3 alone and CaFe 2 O 4 /O 3 systems nearly completely removed AOII's color. In the first 5 min, O 3 alone had a color removal efficiency of 75.66%, rising to 92% in 10 min, whereas the CaFe 2 O 4 /O 3 system had 81.49%, 94%, and 98% after 5, 10, and 20 min, respectively. The O 3 and CaFe 2 O 4 /O 3 systems degrade TOC most efficiently at pH 9 and better with 1.0 g per L CaFe 2 O 4 . TOC removal effectiveness reduced from 85% to 62% when the initial AOII concentration increased from 100 to 500 mg L −1 . The study of degradation kinetics reveals a pseudo-first-order reaction mechanism significantly as the solution pH increased from 3 to 9. Compared to the O 3 alone system, the CaFe 2 O 4 /O 3 system has higher k values. At pH 9, the k value for the CaFe 2 O 4 /O 3 system is 1.83 times higher than that of the O 3 alone system. Moreover, increasing AOII concentration from 100 mg L −1 to 500 mg L 1 subsequently caused a decline in the k values. The experimental data match pseudo-first-order kinetics, as shown by R 2 values of 0.95-0.99. AOII degradation involves absorption, ozone activation, and reactive species production based on the existence of CaO and FeO in the CaFe 2 O 4 nanocatalyst. This catalyst can be effectively recycled multiple times. This study used CaFe 2 O 4 nanoparticles as a catalyst for ozonation processes to degrade Acid Orange II (AOII) in aqueous solution.
doi_str_mv 10.1039/d3ra04553f
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The study compared heterogeneous catalytic ozonation (CaFe 2 O 4 /O 3 ) with ozone treatment alone (O 3 ) at different pH values (3-11), catalyst dosages (0.25-2.0 g L −1 ), and initial AOII concentrations (100-500 mg L −1 ). The O 3 alone and CaFe 2 O 4 /O 3 systems nearly completely removed AOII's color. In the first 5 min, O 3 alone had a color removal efficiency of 75.66%, rising to 92% in 10 min, whereas the CaFe 2 O 4 /O 3 system had 81.49%, 94%, and 98% after 5, 10, and 20 min, respectively. The O 3 and CaFe 2 O 4 /O 3 systems degrade TOC most efficiently at pH 9 and better with 1.0 g per L CaFe 2 O 4 . TOC removal effectiveness reduced from 85% to 62% when the initial AOII concentration increased from 100 to 500 mg L −1 . The study of degradation kinetics reveals a pseudo-first-order reaction mechanism significantly as the solution pH increased from 3 to 9. Compared to the O 3 alone system, the CaFe 2 O 4 /O 3 system has higher k values. At pH 9, the k value for the CaFe 2 O 4 /O 3 system is 1.83 times higher than that of the O 3 alone system. Moreover, increasing AOII concentration from 100 mg L −1 to 500 mg L 1 subsequently caused a decline in the k values. The experimental data match pseudo-first-order kinetics, as shown by R 2 values of 0.95-0.99. AOII degradation involves absorption, ozone activation, and reactive species production based on the existence of CaO and FeO in the CaFe 2 O 4 nanocatalyst. This catalyst can be effectively recycled multiple times. 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At pH 9, the k value for the CaFe 2 O 4 /O 3 system is 1.83 times higher than that of the O 3 alone system. Moreover, increasing AOII concentration from 100 mg L −1 to 500 mg L 1 subsequently caused a decline in the k values. The experimental data match pseudo-first-order kinetics, as shown by R 2 values of 0.95-0.99. AOII degradation involves absorption, ozone activation, and reactive species production based on the existence of CaO and FeO in the CaFe 2 O 4 nanocatalyst. This catalyst can be effectively recycled multiple times. 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At pH 9, the k value for the CaFe 2 O 4 /O 3 system is 1.83 times higher than that of the O 3 alone system. Moreover, increasing AOII concentration from 100 mg L −1 to 500 mg L 1 subsequently caused a decline in the k values. The experimental data match pseudo-first-order kinetics, as shown by R 2 values of 0.95-0.99. AOII degradation involves absorption, ozone activation, and reactive species production based on the existence of CaO and FeO in the CaFe 2 O 4 nanocatalyst. This catalyst can be effectively recycled multiple times. This study used CaFe 2 O 4 nanoparticles as a catalyst for ozonation processes to degrade Acid Orange II (AOII) in aqueous solution.</abstract><doi>10.1039/d3ra04553f</doi><tpages>14</tpages></addata></record>
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title Enhancing acid orange II degradation in ozonation processes with CaFeO nanoparticles as a heterogeneous catalyst
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