The Influence of Cu(II) Existence State on Characteristics, Reactivity, and Recyclability of Microscale Fe/Cu Bimetal

Abstract

Despite the successes achieved in contaminant treatments with microscale Fe/Cu bimetals, some important limitations, such as high Cu loading and easily shedding of the Cu layer, cannot be ignored. The purpose of this research is to get a new mFe/Cu bimetal preparation method by changing the Cu(II) existence state during the preparation process. The Cu layer was regularly distributed on the surface of microscale Fe with uniform nanograde-sized globular shape particles (mFe/nCu) in the presence of complexants, which facilitated catalytic sites and galvanic couple formation. Furthermore, the reactivity of the prepared mFe/nCu bimetal increased linearly with the complexation constants (lgk MY ) of the different complexants. Particularly, k obs (0.090 min −1 ) obtained by mFe/nCu bimetallic particles after five cycles was higher than that of the fresh mFe/Cu (0.074 min −1 ) bimetallic particles prepared without a complexant. This work improves the preparation of Fe/Cu bimetal and provides a deep insight into the improvement reason of reactivity and operational life.

Removal of hexavalent chromium from wastewater by Cu/Fe bimetallic nanoparticles

“…3 ). This could be resulted from the aggregates of Cu nanoparticles and the shedding of Cu layer at the excessive Cu dosages 18 , 37 . Studies showed that excessive Cu was easy to be dropped off from the iron surface by outside force (e.g., agitation or fluidization), which resulted in the loss of catalytic ability 30 .…”

Synthesis of Fe–Mn-Based Materials and Their Applications in Advanced Oxidation Processes for Wastewater Decontamination: A Review

“…Periodate (PI), as a novel oxidant (IO 4 – , 1.6 V), can be activated by ultrasonic, UV, carbon materials, transition metals to produce active substances (e.g., IO 3 ·, ·OH, ·O 2 – , 1 O 2 , atomic oxygen O­( 3 P) and IO 4 ·) for effective degradation of organic pollutants . He et al found that the sludge biochar loaded with Fe–Mn oxides (Fe/Mn-SBC)/periodate system maintained thiamidacloprid (TCP) degradation rates over 92% in a wide pH range − due to the enhanced electron transfer between Fe and Mn oxides. Additionally, Fe/Mn-SBC exhibited interference resistance, excellent reusability, and low metal leaching in natural aqueous matrices …”

“…So far, chemical oxidation water treatment technology has been proposed as the mainstream method to achieve efficient removal of pollutants like heavy metals and refractory organic matter compared with physical and biological treatment methods. , Particularly, chemical treatment methods rely on functional materials with activity for pollutant adsorption and degradation, that is, transition metal materials, carbon materials, natural minerals and polymer materials, etc. − Among them, transition metal materials (e.g., cobalt, iron, copper, ruthenium, and manganese-based materials) have been actively applied to the treatment of organic dyes and trace pollutants in water for their adjustable functionality and structure, high environmental compatibility, and redox properties. , As far as monometallics are concerned, although Co-based and Cu-based materials have good decontamination effects, the toxicity of leached ions remains a huge hidden health hazard . Ru-based and other noble metal materials are also not available for large-scale application in water treatment due to their high price .…”

“…5−7 Among them, transition metal materials (e.g., cobalt, iron, copper, ruthenium, and manganese-based materials) have been actively applied to the treatment of organic dyes and trace pollutants in water for their adjustable functionality and structure, high environmental compatibility, and redox properties. 8,9 As far as monometallics are concerned, although Cobased and Cu-based materials have good decontamination effects, the toxicity of leached ions remains a huge hidden health hazard. 10 Ru-based and other noble metal materials are also not available for large-scale application in water treatment due to their high price.…”

Removal of Hexavalent Chromium From Wastewater by Cu/Fe Bimetallic Nanoparticles

“…4). This could be resulted from the aggregates of Cu nanoparticles and the shedding of Cu layer at the excessive Cu dosages [19,35]. Studies showed that excessive Cu was easy to be dropped off from the iron surface by outside force (e.g., agitation or fluidization), which resulted in the loss of Cu catalytic ability [29].In addition, excessive Cu loading resulted in a decrease of the Fe hydroxide amount on the surface of the particles.…”