MgFe2O4 Magnetic Catalyst for Photocatalytic Degradation of Congo Red Dye in Aqueous Solution Under Visible Light Irradiation

Q3 Environmental Science
F. Riyanti, ,. N. , Nurhidayah, W. Purwaningrum, N. Yuliasari, P. Hariani
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引用次数: 0

Abstract

In this study, MgFe2O4 was successfully synthesized through the coprecipitation method using the precursors Fe(NO3)3·9H2O and Mg(NO3)2·6H2O. The MgFe2O4 product was characterized using XRD, SEM-EDS, VSM, UV-DRS, and FTIR. The catalyst was used for the photocatalytic degradation of Congo red dye under visible light irradiation. The variables of the photocatalytic degradation included solution pH, Congo red concentration, H2O2 concentration, and irradiation time. The MgFe2O4 synthesized has magnetic properties, with a saturation magnetization value of 17.78 emu/g and a band gap of 1.88 eV. A degradation efficiency of 99.62% was achieved under specific conditions, including a Congo red concentration of 10 mg/L, a solution pH of 6, an H2O2 concentration of 2.5 mM, and an irradiation time of 180 min. The degradation efficiency without H2O2 was observed to be 83.45%. The photocatalytic degradation of Congo red followed the pseudo-first-order kinetics model with a rate constant (k) of 0.0167 min-1 and a half-life (t1/2) of 41.49 min. The total organic carbon (TOC) removal of 84.58% indicated that the mineralization of Congo red had occurred. The effectiveness of photocatalytic degradation decreased from 99.62% to 94.50% (<5%) after five cycles of photocatalytic degradation. The results demonstrated that MgFe2O4 has a high Congo red dye degradation efficiency, can be regenerated, and is readily separated from the solution using a permanent magnet.
MgFe2O4磁性催化剂在可见光照射下光催化降解刚果红染料
本研究以Fe(NO3)3·9H2O和Mg(NO3,2·6H2O为前驱体,采用共沉淀法成功合成了MgFe2O4。使用XRD、SEM-EDS、VSM、UV-DRS和FTIR对MgFe2O4产物进行了表征。用该催化剂在可见光照射下光催化降解刚果红染料。光催化降解的变量包括溶液pH、刚果红浓度、H2O2浓度和辐照时间。合成的MgFe2O4具有磁性,饱和磁化值为17.78mu/g,带隙为1.88eV。在特定条件下,包括刚果红浓度为10mg/L、溶液pH为6、H2O2浓度为2.5mM和辐照时间为180min,降解效率达到99.62%。在没有H2O2的情况下,光催化降解刚果红的效率为83.45%。刚果红的光催化降解遵循准一级动力学模型,速率常数(k)为0.0167min-1,半衰期(t1/2)为41.49min。总有机碳(TOC)去除率为84.58%,表明刚果红已发生矿化。经过5个周期的光催化降解,光催化降解效率从99.62%下降到94.50%(<5%)。结果表明,MgFe2O4具有高的刚果红染料降解效率,可以再生,并且使用永磁体很容易从溶液中分离。
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来源期刊
Environment and Natural Resources Journal
Environment and Natural Resources Journal Environmental Science-Environmental Science (all)
CiteScore
1.90
自引率
0.00%
发文量
49
审稿时长
8 weeks
期刊介绍: The Environment and Natural Resources Journal is a peer-reviewed journal, which provides insight scientific knowledge into the diverse dimensions of integrated environmental and natural resource management. The journal aims to provide a platform for exchange and distribution of the knowledge and cutting-edge research in the fields of environmental science and natural resource management to academicians, scientists and researchers. The journal accepts a varied array of manuscripts on all aspects of environmental science and natural resource management. The journal scope covers the integration of multidisciplinary sciences for prevention, control, treatment, environmental clean-up and restoration. The study of the existing or emerging problems of environment and natural resources in the region of Southeast Asia and the creation of novel knowledge and/or recommendations of mitigation measures for sustainable development policies are emphasized. The subject areas are diverse, but specific topics of interest include: -Biodiversity -Climate change -Detection and monitoring of polluted sources e.g., industry, mining -Disaster e.g., forest fire, flooding, earthquake, tsunami, or tidal wave -Ecological/Environmental modelling -Emerging contaminants/hazardous wastes investigation and remediation -Environmental dynamics e.g., coastal erosion, sea level rise -Environmental assessment tools, policy and management e.g., GIS, remote sensing, Environmental -Management System (EMS) -Environmental pollution and other novel solutions to pollution -Remediation technology of contaminated environments -Transboundary pollution -Waste and wastewater treatments and disposal technology
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