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Assessment of the Arsenic Removal From Water Using Lanthanum Ferrite
ChemistryOpen ( IF 2.5 ) Pub Date : 2021-08-05 , DOI: 10.1002/open.202100065
Fabiana E García 1 , Marta I Litter 2 , Isabella Natali Sora 3
Affiliation  

The catalytic performance of a perovskite-type lanthanum ferrite LaFeO3 to remove arsenic from water has been investigates for the first time. LaFeO3 was prepared by citrate auto-combustion of dry gel obtained from a solution of the corresponding nitrates poured into citric acid solution. Kinetic studies were performed in the dark with As(V) and in the dark and under UV-C irradiation at pH 6–7 with As(III) (both 1 mg L−1), and As : Fe molar ratios (MR) of 1 : 10 and 1 : 100 using the LaFeO3 catalyst. As(V) was removed from solution after 60 min in the dark in 7 % and in 47 % for MR=1 : 10 and MR=1 : 100, respectively, indicating the importance of the amount of the iron material on the removal. Oxidation of As(III) in the dark was negligible after 60 min in contact with the solid sample, but complete removal of As(III) was observed within 60 min of irradiation at 254 nm, due to As(III) photooxidation to As(V) and to As(III) sorption to a minor extent. Morphological and microstructural studies of the catalyst complement the catalytic testing. This work demonstrates that LaFeO3 can be used for the removal of As(III) from highly arsenic contaminated water.

中文翻译:


使用铁酸镧去除水中砷的评估



首次研究了钙钛矿型铁酸镧LaFeO 3去除水中砷的催化性能。 LaFeO 3通过将相应的硝酸盐倒入柠檬酸溶液中得到的干凝胶进行柠檬酸盐自燃烧来制备。在黑暗中使用 As(V) 进行动力学研究,并在黑暗和 UV-C 照射下、pH 6-7 下使用 As(III)(均为 1 mg L -1 )以及 As : Fe 摩尔比 (MR) 进行动力学研究使用LaFeO 3催化剂的1:10和1:100。 MR=1:10 和 MR=1:100 时,在黑暗中 60 分钟后,As(V) 从溶液中去除,去除率分别为 7% 和 47%,这表明铁材料的量对去除的重要性。与固体样品接触 60 分钟后,As(III) 在黑暗中的氧化可以忽略不计,但由于 As(III) 光氧化为 As( V) 和较小程度的 As(III) 吸附。催化剂的形态和微观结构研究补充了催化测试。这项工作表明LaFeO 3可用于去除高砷污染水中的As(III)。
更新日期:2021-08-05
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