ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 31
·77488-77498
·
IF 5.8
Lan Bingyan,Hao Chenhui,Zhang Mengze,Yan Xiaomin
Two in situ formed Fe(III) oxyhydroxides (FeO x ) originated from ferrate reduction (designated FeO x –Fe VI ) and ferrous oxidation by H 2 O 2 (designated FeO x –Fe II ) were compared in the aspects of morphology, hydrolyzed species, surface binding mechanism of lead. The theoretical maximum adsorption capacity calculated from the Langmuir model toward Pb(II) was 929.54 and 810.37 mg/g Fe by FeO x –Fe VI and FeO x –Fe II , respectively. At pH 6 and the same Fe/Pb ratio, the kinetic rate of Pb removal by the FeO x –Fe VI process was 8 times faster. FTIR, SEM, and Ferron assay suggest FeO x –Fe VI was associated with a lesser polymerization degree and contained more reactive hydroxyl-Fe polymers than those in the FeO x –Fe II sample. SAXS verified that the particles possessed a smaller, more homogeneous, and open structure when Fe was hydrolyzed by ferrate reduction than ferrous oxidation. XPS coupled with fractal analysis suggests the different sorption capacities of Pb(II) can be ascribed to their distinct growth patterns. Fast cluster agglomeration during FeO x –Fe II fabrication decreased the exposure of effective adsorption sites. In comparison, the incompact assemblies of FeO x –Fe VI clusters facilitated Pb(II) ions to access the interstices of octahedral FeO 6 units and formed an edge-sharing complex. This work provides new insight into mechanisms of particle fabrication and heavy metal removal of Fe(III) formed in situ.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
BIOMETALS
·
2019
·Vol. 32
·期 2
·251-264
·
IF 2.455
Liu Xiao-Li,Ye Sen,Li Hua-Wei,Lu Bo,Yu Yan-Qin,Fan Yu-Peng,Yang Wei-Jun,Yang Jin-Shu
Rimicaris exoculata (Decapoda: Bresiliidae) is one of the dominant species among hydrothermal vent communities along the Mid-Atlantic Ridge. This shrimp can tolerate high concentrations of heavy metals such as iron, but the mechanisms used for detoxification and utilization of excess metals remain largely unknown. Ferritin is a major iron storage protein in most living organisms. The central heavy subunit of ferritin (H-ferritin) possesses ferroxidase activity and converts iron from Fe 2+ to Fe 3+ , the non-toxic form used for storage. In the present study, the H-ferritin RexFrtH was identified in the hydrothermal vent shrimp R. exoculata , and found to be highly expressed in the gill, the main organ involved in bioaccumulation of metals, at both RNA and protein levels. Accumulation of RexFrtH decreased from efferent to afferent vessels, coinciding with the direction of water flow through the gills. Fe 3+ was localized with RexFrtH, and in vitro iron-binding and ferroxidase assays using recombinant RexFrtH confirmed the high affinity for iron. Based on these results, we propose a model of iron metabolism in R. exoculata gills; ferrous iron from ambient hydrothermal water accumulates and is converted and stored in ferric form by RexFrtH as an iron reservoir when needed for metabolism, or excreted as an intermediate to prevent iron overload. The findings expand our understanding of the adaptation strategies used by shrimps inhabiting extreme hydrothermal vents to cope with extremely high heavy metal concentrations.
研究领域:
海洋生物学
·
分子生物学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Yun Liu,Xin Hu,Yin Xu
To control acid mine drainage (AMD) at the source, a novel nanocomposite coating, based on SiO 2 nanoparticles as nanofiller embedded in γ-mercaptopropyltrimethoxysilane (PropS-SH) coating is introduced in this paper. The performance of the PropS-SH/SiO 2 (PSS) nanocomposite coatings with a different content of SiO 2 nanoparticles on pyrite oxidation inhibition was evaluated by electrochemical measurements and chemical leaching testing. The results of the investigations revealed that the addition of appropriate SiO 2 nanoparticles could greatly enhance the passivation efficiency of PropS-SH coating. The best coating was obtained from 3% (v/v) of PropS-SH solution with 2 wt% SiO 2 nanoparticles as this coating decreased pyrite oxidation by 81.1% (based on Fe release). In addition, the coating mechanism of PSS coatings on pyrite surfaces is presented in this paper.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Guoquan Na,Wen-Gang Cui,Hangyan Shi,Zhenglong Li,Fan Gao,Xingqiang Wang,Ke Wang,Yong Gao,Yaxiong Yang,Zichao Shen,Yanxia Liu,Jian Miao,Hongge Pan
LiBH4 has attracted significant interest due to its high-hydrogen storage capacity (18.5 wt % H2). However, its practical application is severely impeded by the high dehydrogenation temperature, sluggish hydrogen release kinetics, and poor reversibility. In this work, a graphene-supported rodlike FeF2/FeOX additive (FeF2/FeOX@G) is prepared and introduced into LiHB4 by a simple ball-milling. With an optimized LiBH4-to-FeF2/FeOX@G weight ratio of 7:3, the 7LiBH4-3(FeF2/FeOX@G) system starts dehydrogenation at a low temperature of 100 °C below and 8.7 wt % H2 is released upon heating to 400 °C, while 1.1 wt % H2 is released for pristine LiBH4. Moreover, the system releases rapidly 7.0 wt % H2 at 350 °C within 80 min, and a dehydrogenation capacity of 5.5 wt % is reached after 10 reversible hydrogen absorption and desorption cycles. The in situ formed FeB, Li3BO3, and Fe2B during the first dehydrogenation process acted as a synergistic catalysis, effectively improving the reversible hydrogen storage of LiBH4. This work provides insights into the design of unique additives to introduce multiple catalyst synergies to enhance the hydrogen storage performance of LiBH4.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Science and Technology
·
2023
·Vol. 20
·期 12
·13399-13410
·
IF 3.1
Xiong H.,Peng S.,Zhang B.
Nonionic surfactants with ideal surface properties and lower ecotoxicities have been highly attended in metal bioleaching and pollutant bio-treatment in environmental science field. In this study, both Acidithiobacillus ferrooxidans HX3 and Tween 80 (or Triton X-100) presence in cultures, bio-production and development of schwertmannite as a potential metal scavenger were investigated. To explore their correlations, the resulting ferric oxyhydroxides under various surfactant levels (lower/optimal/higher ones for Gp I/II/III treatments) were identified by many characterization methods. Result showed that after 48 h of normally bacterial reproduction, surfactant-rich cultures with Tween 80 more than 50 mg/L (25 mg/L for Triton X-100) could only achieve down 80% of ferrous oxidation percent and 10 7 cells/mL of cell numbers, while those with lower surfactant level were ahead 12 h. Culture pH values decreased to about 2.4 (or 2.0) from initially 2.8. All initial ferric oxyhydroxides were only pincushion-schwertmannite spheres. When cells sequentially reproduced within 36 h–48 h, presence of surfactants (except for Triton X-100 at 75 mg/L) could induce schwertmannite-pincushion assembling on developed spherical particles with a little of diamond-jarosite. And then during bacterial stability state (48 h–72 h), the pincushion assemblages on developed schwertmannite-spheres would disappear, following occurrence of more jarosite amount. Obviously, schwertmannite stability and morphological evolvement were affected by type and level of the added surfactants. These results will give a convincing proof for understanding biomineralization principles of iron minerals in natural environments with nonionic surfactants.
研究领域:
环境科学
·
微生物学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）