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Removal of As(III) from Water Using the Adsorptive and Photocatalytic Properties of Humic Acid-Coated Magnetite Nanoparticles

机译:使用腐殖酸涂覆的磁铁矿纳米粒子的吸附和光催化性能从水中除去(III)

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摘要

The oxidation of highly toxic arsenite (As(III)) was studied using humic acid-coated magnetite nanoparticles (HA-MNP) as a photosensitizer. Detailed characterization of the HA-MNP was carried out before and after the photoinduced treatment of As(III) species. Upon irradiation of HA-MNP with 350 nm light, a portion of the As(III) species was oxidized to arsenate (As(V)) and was nearly quantitatively removed from the aqueous solution. The separation of As(III) from the aqueous solution is primarily driven by the strong adsorption of As(III) onto the HA-MNP. As(III) removals of 40–90% were achieved within 60 min depending on the amount of HA-MNP. The generation of reactive oxygen species (•OH and O ) and the triplet excited state of HA-MNP ( HA-MNP*) was monitored and quantified during HA-MNP photolysis. The results indicate HA-MNP* and/or singlet oxygen ( O ) depending on the reaction conditions are responsible for converting As(III) to less toxic As(V). The formation of HA-MNP* was quantified using the electron transfer probe 2,4,6-trimethylphenol (TMP). The formation rate of HA-MNP* was 8.0 ± 0.6 × 10 M s at the TMP concentration of 50 µM and HA-MNP concentration of 1.0 g L . The easy preparation, capacity for triplet excited state and singlet oxygen production, and magnetic separation suggest HA-MNP has potential to be a photosensitizer for the remediation of arsenic (As) and other pollutants susceptible to advanced oxidation.
机译:使用腐殖酸涂覆的磁铁矿纳米粒子(HA-MNP)作为光敏剂研究高毒性杂锌矿(AS(III))的氧化。 HA-MNP的详细表征在光诱导的待处理之前和之后进行的(III)物种。在用350nm光照射Ha-MnP时,将一部分AS(III)物种被氧化成砷酸盐(如(v)),并从水溶液中几乎定量地除去。从水溶液中分离为(III),主要由强吸附(III)在HA-MNP上的强烈吸附。由于(III)除去40-90%的除去,根据HA-MNP的量,在60分钟内实现。在HA-MNP光解期间监测和定量反应性氧物质(•OH和O)和三重态激发态并定量的氧化物氧(HA-MNP *)。结果表明,取决于反应条件的HA-MNP *和/或单次氧(O)负责转化为(III)至毒性较低,如(v)。使用电子转移探针2,4,6-三甲基苯酚(TMP)量化HA-MNP *的形成。 HA-MNP *的形成速率为8.0±0.6×10M S,TMP浓度为50μm,HA-MNP浓度为1.0g l。易于制备,三重态激发态和单线氧生产能力和磁性分离表明HA-MNP具有用于修复砷(AS)和易受晚期氧化氧化的其他污染物的光敏剂。

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