Evolutional solid phase and solid-liquid interface uranium immobilization mechanisms by nanoscale zero-valent iron and enhanced uranium stability control strategy

Ye, Hua; Li, Donghan; Zou, Jinglan; Wang, Wei; Wu, Xiaoyan; Zhang, Xiaowen; Liu, Qing; Zhao, Guodong; Li, Mi; Zhang, Wei‐xian; Yang, Jianping

doi:10.1016/j.cej.2022.139924

Cited by 22 publications

(5 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pH was adjusted after 60 min of reaction to investigate its effect on the removal of Sb(V). As shown in Figure 7c, the lower the initial pH, the higher the total iron ion concentration released by mZVI-A, 38 and the total iron ion concentration in the solution reached a balance after 60 min of reaction (Figure 7d). Additionally, the lower the initial pH, the lower the removal rate of Sb(V) (Figure 7b), which may be attributed to the intense corrosion of mZVI-A and its influence.…”

Section: ■ Results and Discussionmentioning

confidence: 85%

“…The best treatment effect was observed at a pH of 6. In acidic environments with pH < 6, the removal of Sb(V) by mZVI was largely affected by the corrosion of mZVI . In alkaline environments with pH > 6, Sb(V) mainly exists in the form of anions H 2 SbO 4 – and Sb(OH) 6 – .…”

Section: Resultsmentioning

confidence: 99%

“…In acidic environments with pH < 6, the removal of Sb(V) by mZVI was largely affected by the corrosion of mZVI. 38 In alkaline environments with pH > 6, Sb(V) mainly exists in the form of anions H 2 SbO 4 − and Sb(OH) 6 − . At this point, increasing pH would increase the concentration of OH − in the solution and thereby increase the negative charge sites on the surface of mZVI, resulting in enhanced electrostatic repulsion between mZVI and H 2 SbO 4 − and Sb(OH) 6 − , which further decreased the adsorption efficiency.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Based on the above experiments and characterization of mZVI-A, the mechanism of Sb(V) removal by mZVI-A can be summarized. The process mainly involves three stages: (1) Reduction, Fe(0) nuclei within mZVI-A release electrons which are then transferred to Sb(V) as an electron acceptor, , with Fe(II) being adsorbed as a reduction active site on the mZVI-A surface to mediate electron transfer, as shown in equations (eqs ); (2) Oxidation, Fe(0) on the surface of mZVI-A is gradually oxidized into γ-Fe 2 O 3 and α-FeOOH, as shown in equations (eqs ); , (3) Adsorption, wherein Sb(V) and the reduced Sb(III) are adsorbed/coprecipitated onto the iron oxide surface of mZVI-A, resulting in their removal, as shown in eqs –: 2 Fe ( 0 ) + O 2 + 2 H 2 normalO → 2 Fe ( II ) + 4 OH − Fe ( 0 ) + 2 H 2 normalO → Fe ( II ) + H 2 ↑ + 2 OH − Fe ( 0 ) + Sb ( V ) → Fe ( II ) + Sb ( III ) 4 Fe ( II ) + O 2 …”

Section: Resultsmentioning

confidence: 99%

“…(3) Adsorption, wherein Sb(V) and the reduced Sb(III) are adsorbed/coprecipitated onto the iron oxide surface of mZVI-A, resulting in their removal, as shown in eqs 8−11:38 …”

mentioning

confidence: 99%

See 4 more Smart Citations

Efficient Removal of Antimony(V) from Antimony Mine Wastewater by Micrometer Zero-Valent Iron

Gan,

Meng,

Lin

et al. 2023

Langmuir

View full text Add to dashboard Cite

This paper investigates the effectiveness of two commercial micron zero-valent irons (mZVIs) in removing Sb(V) from antimony mine wastewater. The wastewater contains a range of complex components and heavy metal ions, including As(V), which can impact the removal efficiency of mZVI. The study aims to provide insights into actual working conditions and focuses on influencing factors and standard conditions. The results demonstrate that mZVI can reduce Sb(V) concentration in the mine wastewater from 3875.7 μg/L to below the drinking water standard of 5 μg/L within 2 h. Adding a small amount of mZVI every 30 min helps to maintain a high removal rate. The study confirms the existence of a reduction reaction by changing the atmospheric conditions of the reaction, and the addition of 1,10-phenanthroline highlights the important role of active Fe(II) in the adsorption and removal of Sb(V) by mZVI. Additionally, the paper presents an innovative experimental method of acid treatment followed by alkali treatment, which proves the interfacial reaction between mZVI and Sb(V). Overall, the study demonstrates that the removal of Sb(V) by mZVI entails a dual function of reduction and adsorption, highlighting the potential of mZVI in repairing Sb(V) in antimony mine wastewater.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…(3) Adsorption, wherein Sb(V) and the reduced Sb(III) are adsorbed/coprecipitated onto the iron oxide surface of mZVI-A, resulting in their removal, as shown in eqs 8−11:38 …”

mentioning

confidence: 99%

See 3 more Smart Citations