Performance and influencing mechanisms of magnetically separable Ni-M layered double hydroxides (M = Fe, Al) for catalytic ozonation
Performance and influencing mechanisms of magnetically separable Ni-M layered double hydroxides (M = Fe, Al) for catalytic ozonation
Yougan Xiao(Fuzhou City Construction Design and Research Institute Co., Ltd); Jiahui Lu(College of Ecological Environment and Urban Construction, Fujian University of Technology); Shunjian Cheng(Fuzhou City Construction Design and Research Institute Co., Ltd.); Zilong Wang(Fuzhou City Construction Design and Research Institute Co., Ltd.); Antong Shi(College of Ecological Environment and Urban Construction, Fujian University of Technology); Jyunhong Shen(College of Ecological Environment and Urban Construction, Fujian University of Technology); Zhuwu Jiang(College of Ecological Environment and Urban Construction, Fujian University of Technology)
130권, 178~190쪽
초록
From a preliminary performance comparison of several layered double hydroxides (LDHs), magneticallyseparable Ni-M LDHs (M = Fe, Al) were synthesized and applied as efficient ozonation catalysts fordegrading dye Rhodamine B (RhB). As proved by various characterizations, the micromorphology, nanostructuresize, and porous feature of the synthesized Ni-M LDHs significantly varied with different metalcomponents. Among them, Ni3-Fe LDH and Ni2-Al LDH possessed a relatively larger specific surface areato react with O3 interfacially, thereby exhibiting excellent catalytic ozonation performance. The RhB wasalmost completely degraded within 60 min, and the removal efficiencies of COD and TOC reached above70% and 50%, respectively. The effects of catalyst dosage, initial dye concentration, solution pH, and coexistinginorganic anions on RhB degradation were studied systematically. ESR measurements and radicalquenching experiments indicated that OH , O2 , and 1O2 are primary reactive oxygen species (ROS), while1O2 induced the most dominant degradation contribution. According to the variations of ROS formationand material properties during the catalytic ozonation process, the possible reaction mechanisms wereproposed. Moreover, the differences involved in the redox of multivalent metals and the transformationof surface hydroxyls over Ni-Fe and Ni-Al LDHs were further revealed.
Abstract
From a preliminary performance comparison of several layered double hydroxides (LDHs), magneticallyseparable Ni-M LDHs (M = Fe, Al) were synthesized and applied as efficient ozonation catalysts fordegrading dye Rhodamine B (RhB). As proved by various characterizations, the micromorphology, nanostructuresize, and porous feature of the synthesized Ni-M LDHs significantly varied with different metalcomponents. Among them, Ni3-Fe LDH and Ni2-Al LDH possessed a relatively larger specific surface areato react with O3 interfacially, thereby exhibiting excellent catalytic ozonation performance. The RhB wasalmost completely degraded within 60 min, and the removal efficiencies of COD and TOC reached above70% and 50%, respectively. The effects of catalyst dosage, initial dye concentration, solution pH, and coexistinginorganic anions on RhB degradation were studied systematically. ESR measurements and radicalquenching experiments indicated that OH , O2 , and 1O2 are primary reactive oxygen species (ROS), while1O2 induced the most dominant degradation contribution. According to the variations of ROS formationand material properties during the catalytic ozonation process, the possible reaction mechanisms wereproposed. Moreover, the differences involved in the redox of multivalent metals and the transformationof surface hydroxyls over Ni-Fe and Ni-Al LDHs were further revealed.
- 발행기관:
- 한국공업화학회
- 분류:
- 화학공학