Enhancing arsenic removal from acidic wastewater using zeolite supported sulfide nanoscale zero‐valent iron: the role of sulfur and copper

2021 ◽  
Author(s):  
Chundi Zhou ◽  
Caiyun Han ◽  
Xize Min ◽  
Ting Yang
Keyword(s):  
Arsenic Removal ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron ◽  
Acidic Wastewater

Unveiling the Role of Sulfur in Rapid Defluorination of Florfenicol by Sulfidized Nanoscale Zero-Valent Iron in Water under Ambient Conditions

2021 ◽  
Vol 55 (4) ◽  
pp. 2628-2638
Author(s):  
Zhen Cao ◽  
Hao Li ◽  
Gregory V. Lowry ◽  
Xiaoyang Shi ◽  
Xiangcheng Pan ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Ambient Conditions ◽  
Nanoscale Zero Valent Iron

Transport of sucrose-modified nanoscale zero-valent iron in saturated porous media: role of media size, injection rate and input concentration

2015 ◽  
Vol 72 (9) ◽  
pp. 1463-1471 ◽  
Author(s):  
Hui Li ◽  
Yong-sheng Zhao ◽  
Zhan-tao Han ◽  
Mei Hong
Keyword(s):  
Porous Media ◽  
Packed Column ◽  
Injection Rate ◽  
Zero Valent Iron ◽  
Silica Sand ◽  
Saturated Porous Media ◽  
Input Concentration ◽  
K Value ◽  
Nanoscale Zero Valent Iron

The growing use of nanoscale zero-valent iron (NZVI) in the remediation of contaminated groundwater raises concerns regarding its transport in aquifers. Laboratory-scale sand-packed column experiments were conducted with bare and sucrose-modified NZVI (SM-NZVI) to improve our understanding of the transport of the nanoparticles in saturated porous media, as well as the role of media size, suspension injection rate and concentration on the nanoparticle behavior. As the main indicative parameters, the normalized effluent concentration was measured and the deposition rate coefficient (k) was calculated for different simulated conditions. Overall, compared to the high retention of bare NZVI in the saturated silica column, SM-NZVI suspension could travel through the coarse sand column easily. However, the transport of SM-NZVI particles was not very satisfactory in a smaller size granular matrix especially in fine silica sand. Furthermore, the value of k regularly decreased with the increasing injection rate of suspension but increased with suspension concentration, which could reflect the role of these factors in the SM-NZVI travel process. The calculation of k-value at the tests condition adequately described the experimental results from the point of deposition dynamics, which meant the assumption of first-order deposition kinetics for the transport of NZVI particles was reasonable and feasible.

Role of sulfide-modified nanoscale zero-valent iron on carbon nanotubes in nonradical activation of peroxydisulfate

2022 ◽  
Vol 422 ◽  
pp. 126949
Author(s):  
Libin Wu ◽  
Qintie Lin ◽  
Hengyi Fu ◽  
Haoyu Luo ◽  
Quanfa Zhong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

scholarly journals Enhanced As(III) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism

2021 ◽  
Author(s):  
Shun Cheng ◽  
Hong Liu ◽  
Emmanuella Anang ◽  
Chunxia Li ◽  
Xianyuan Fan
Keyword(s):  
Arsenic Removal ◽  
Average Particle Size ◽  
Zero Valent Iron ◽  
Maximum Adsorption Capacity ◽  
Average Particle ◽  
Order Kinetic ◽  
Arsenic Adsorption ◽  
Nanoscale Zero Valent Iron ◽  
Wide Ph Range ◽  
Co Precipitation

Abstract Nanoscale zero-valent iron (nZVI) and sulfides have been confirmed to be effective in arsenic sequestration from aqueous solution. In this study, attapulgite supported and sulfide-modified nanoscale zero-valent iron (S-nZVI@ATP) are synthesized to realize the superposition effect of enhanced arsenic sequestration. The results indicated that nZVI clusters were well disaggregated and the BET specific surface area increased from 19.61 m2·g−1 to 46.04 m2·g−1 of S-nZVI@ATP, resulting in an enhanced removal efficiency of arsenic from 51.4% to 65.1% at 20 min. The sulfides in S-nZVI@ATP mainly exists as mackinawite (FeS) and causes the spherical nanoparticles exhibiting a larger average particle size (94.6 nm) compared to bare nZVI (66.0 nm). In addition, S-nZVI@ATP exhibited a prominent ability for arsenic sequestration over a wide pH range of 3.0–6.0. The presence of anions SO42− and Cl− can enhance the arsenic removal whereas HCO3− inhibited it. The arsenic adsorption by S-nZVI@ATP could be explained by the pseudo-second-order kinetic model and the Langmuir model, with the maximum adsorption capacity of 193.8 mg·g−1. The mechanism of As(III) sequestration by S-nZVI@ATP involved multiple processes, mainly including precipitation conversion from FeS to As2S3, surface-complexation adsorption and co-precipitation.

Role of oxidative stress in inactivation of Escherichia coli BW25113 by nanoscale zero-valent iron

2016 ◽  
Vol 565 ◽  
pp. 857-862 ◽  
Author(s):  
Krittanut Chaithawiwat ◽  
Alisa Vangnai ◽  
John M. McEvoy ◽  
Birgit Pruess ◽  
Sita Krajangpan ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Escherichia Coli ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

Modeling arsenic removal by nanoscale zero-valent iron

2020 ◽  
Vol 192 (2) ◽  
Author(s):  
Umma S. Rashid ◽  
Bernhardt Saini-Eidukat ◽  
Achintya N. Bezbaruah
Keyword(s):  
Arsenic Removal ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron
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