CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Boyang Wu,Caiping Liu,Chengyu Fu,Pan Wu,Changjun Liu,Wei Jiang
The recovery and separation of vanadium and chromium from vanadium-containing chromate solution are necessary and valuable for the comprehensive utilization and environmental protection of V-Ti-bearing magnetite ore. In this work, a tetragonal ZrO 2 adsorbent was used for harmless treatment and resource reuse of a low-concentration vanadium-containing chromate solution. Results confirmed that water after treatment met the wastewater discharge standard; in addition, Cr(VI) and V(V) were efficiently separated with the V/Cr separation coefficient of 362.05 for the pH of 3.5 and the V/Cr ratio of 1:1 at the concentration of 80 mg/L. This excellent and stable separation performance of ZrO 2 was ascribed to the competitive adsorption of V(V) and Cr(VI) on ZrO 2 , owing to the strong effect of pH on their adsorption and desorption behavior. V(V) and Cr(VI) in vanadium-containing chromate solution can be removed, recovered, separated and enriched through a two-step adsorption/desorption process. The purity of vanadium and chromium can reach more than 99.8%. The adsorption of vanadium and chromium by ZrO 2 has high application value, which is beneficial to the recovery of resources and environmental protection.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Haidong Li,Han Song,Yuankun Yang,Haitao Wang,Beibei Fan,Juncheng Zheng,Weiguo Tu,Xuemei Luo,Shu Chen
Efficient and economical reduction and elimination of co-pollution of vanadium (V) and chromium (Cr) from water sources is a major challenge. In this study, sulphate green rust (GR SO4 ) was successfully prepared by co-precipitation method and used for the removal of V(V) and Cr(VI). The findings from batch adsorption experiments indicated that the adsorption capacity of GR SO4 for V(V) and Cr(VI) individually was 30.66 mg⋅g −1 and 39.48 mg⋅g −1 , respectively, with equilibrium reached in 25 min and 10 min. Intriguingly, in a binary system with both V(V) and Cr(VI) present, the time to reach adsorption equilibrium for V(V) removal by GR SO4 was 30 % shorter comparison to the single system under identical conditions. By analyzing the surface characteristics, crystal structure and elemental valence changes of GR SO4 minerals before and after the reaction, it can be obtained that: i) Direct adsorption mainly drives the removal of V(V) by GR SO4 , whereas the removal of Cr(VI) is preceded by reduction and followed by adsorption. ii) In a binary coexistence system, the formation of Fe(III)-Cr(III) oxide (GR-Cr(III)) during the removal of Cr(VI) by GR SO4 formed during the removal of Cr(VI) by GR SO4 creates additional adsorption sites for V(V), which shortens the equilibrium time of the V(V) removal reaction by GR SO4 and reduces the amount of V(V) leached. These findings are of great practical significance for understanding the mechanism and practical application of GR SO4 in the synergistic removal of V(V) and Cr(VI) heavy metals and provide valuable insights into their geophysical-chemical cycling.
研究领域:
环境科学
·
化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiubo Xie,Ming Chen,Peng Liu,Jiaxiang Shang,Tong Liu
The Mg-5.0 wt%Ni-2.3 wt%V nanocomposite has been produced through reducing NiCl 2 with the Mg-V nanoparticles (NPs) prepared by hydrogen plasma metal reaction (HPMR) approach. The in situ formed Ni and V particles of about 15 nm uniformly decorate on the surface of Mg NPs. The Ni NPs transform into Mg 2 Ni while the V NPs remain unchanged after first hydrogen absorption and desorption cycle at 673 K. They show synergistic catalytic effects on the hydrogen storage properties of Mg-Ni-V nanocomposite. The nanocomposite can absorb 4.6 wt% H 2 within 30 min at 473 K and desorb 5.2 wt% H 2 within 10 min at 623 K. The activation energies of hydrogenation/dehydrogenation processes are decreased to 52.8 and 85.1 kJ per mol H 2 , lower than those of the Mg-5.4 wt%Ni nanocomposite of 63.2 and 89.3 kJ per mol H 2 . The enhanced hydrogen storage performances of the Mg-Ni-V nanocomposite are mainly attributed to the synergistic catalytic effects of the Mg 2 Ni and V catalysts, and the nanosize effect of Mg NPs on the decrease of the hydrogen diffusion distance.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Jie Liu,Jinhong Ren,Yunmei Du,Xiao Chen,Mengmeng Wang,Yanru Liu,Lei Wang
It is a great challenge to induce the formation of the RuP 4 phase and realize the construction of a metal-rich phase/phosphorus-rich phase-ruthenium phosphide heterostructure by directional regulation of the proportion of P and metal atoms. The ultra-high conductivity of Ru 2 P and the excellent ability of V-doped RuP 4 to absorb/desorb H* are confirmed by density functional theory (DFT) calculations, which laid a theoretical foundation for the construction of a unique Ru 2 P/V-RuP 4 structure to accelerate HER reaction kinetics. This work innovatively uses the V-doping strategy to induce the formation of RuP 4 phase with high intrinsic activity, and finally construct V-Ru x P y nanosheets with rich Ru/Ru 2 P/V-RuP 4 heterostructures. Thanks to the rich Ru/Ru 2 P/V-RuP 4 heterostructure and the optimization of V dopants, the V-Ru x P y catalyst only needs 180 mV to obtain an industrial-grade current density of 1 A cm −2 . In summary, this work provides a new idea for the design and performance optimization of ruthenium-based catalysts.
研究领域:
材料科学
·
催化
·
电化学
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产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Ting Lu,Yucui Hou,Weize Wu,Muge Niu,Wei Li,Shuhang Ren
Carboxylic acids are considered as an important group of chemicals. Direct conversion of cellulose to formic acid (FA) by vanadium(V(V))-contained catalyst is of significant conceptual and practical interest. A second metal (from Mg(II), Ca(II), Al(III), Cr(III), Mo(VI), Mn(II), Cu(II), or Fe(III)) incorporated into V(V)-contained catalyst system was screened to further improve the oxidation of cellulose by O 2 to yield FA. Fe(III) exhibited the best performance and effects of reaction parameters on the conversion of cellulose in NaVO 3 -FeCl 3 -H 2 SO 4 aqueous solution were investigated. Cellulose could be rapidly converted, and the yield of FA (66.8%) was higher than that obtained by the single use of FeCl 3 (48.4%) or NaVO 3 (57.6%). The conversion of cellulose in another V(V)-contained catalyst system (H 5 PV 2 Mo 10 O 40 ) was explored to verify the universal enhancement of FeCl 3 . Influences of the second metal Fe(III) on the V(V)-contained catalyst system and mechanism of cellulose oxidation in the V(V)-Fe(III)-H 2 SO 4 system were studied. Compared with single use of V(V), the employment of Fe(III) alone is not active enough in the oxidative C C bond cleavage . V(V) other than Fe(III) is the main active species for selective oxidation of substrates. The incorporation of Fe(III) and V(V) shows both synergistic and competitive relationships. Both the synergistic and competitive effects are beneficial to increase FA yield, as they promote the oxidation of V(IV) to V(V), increase oxidative ability, and inhibit the overoxidation to by-product CO 2 . The catalyst system was reused four times without decline in activity.
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Lei Chen,Yu Han,Wei Li,Xiaohui Zhan,He Wang,Chengchao Shi,Yanping Sun,Huixiang Shi
Although ferrihydrite (Fh) exhibits good Sb(V) adsorption behavior, the instability of its amorphous structure limits its engineering applications. In this study, siliceous ferrihydrite (SiFh) was prepared via coprecipitation to resolve these limitations. X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and SiFh aging tests revealed that the growth of Fh particles covered with Fe–O–Si links was inhibited while maintaining their amorphous structure. Meanwhile, the XRD patterns indicated that SiFh maintained excellent stability after five adsorption–desorption cycles. During the aging process, the added Si decreased the electrostatic interaction between SiFh and Sb(V), which weakened the affinity between Sb(V) and Fh; however, most of the Sb(V) still entered the Fe lattice after seven days of aging, which was favorable for Sb(V) recovery during reutilization. Furthermore, Sb(V) adsorbed from the simulated textile wastewater onto SiFh had the highest adsorption energy (E ads ), which meant its unstable inner-sphere complexation on the surface of SiFh. Meanwhile, the presence of SO 4 2− , NO 3 − , Ca 2+ , and Mg 2+ contributed to Sb(V) outer-sphere adsorption. Both of these factors were conducive to Sb(V) desorption. Hence, SiFh is a promising adsorbent owing to its facile preparation process, stability, and optimal regeneration properties.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Feiyu Gao,Zeming Qiu,Yong Hou,Yang You,Xuewei Lv,Jie Dang
Efficient and selective adsorption of V(V), pentavalent vanadium, from strategic polymetallic shale leaching solutions is crucial for resource utilization. However, the lack of a high-capacity adsorbent poses a significant challenge. Herein, we have successfully developed a novel composite adsorbent material by cross-linking orange peel biomass with aminated MXene , referred to as OPM . The incorporation of aminated MXene enhanced the availability of reactive groups within the material. The unique aerogel structure avoids the accumulation of MXene, thus improving the exposure of active sites. Furthermore, the positively charged surface of OPM enabled efficient adsorption of pentavalent vanadium ions . Experimental results showed that the adsorption of V(V) fitted well with the Langmuir adsorption isotherm model, and its adsorption rate was controlled by the pseudo-second-order kinetic mechanism. Remarkably, OPM exhibited a remarkable maximum adsorption capacity of 748.42 mg/g at pH=4. Even in the presence of interfering anions and cations, OPM maintains a high adsorption capacity for V(V).In the simulated wastewater adsorption experiment, the removal rate of V by the adsorbent exceeded 80 % After five cycles of adsorption, the material retains an adsorption capacity of more than 78 %. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy revealed that the adsorption mechanism of OPM on V(V) is attributed to the fact that OPM is protonated under acidic conditions and has strong electrostatic interactions with pentavalent vanadium anion, in which abundant hydroxyl and carboxyl groups can undergo ion-exchange reactions with vanadium anion. Meanwhile, the amino group reduces V(V) to V(IV) and forms a complex with the oxygen/nitrogen functional group. This study provides theoretical understanding and practical application for the synergistic adsorption of V(V) on aerogels prepared from MXene composite orange peel biomass.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 28
·4039-4047
·
IF 3.1
Guoliang Feng,Jintao Gao,Xi Lan,Yu Li,Zhancheng Guo
Vanadium (V) is often transferred into vanadium slag from the smelting of vanadium titano-magnetite ore, however, basic data for the crystallization behavior and crystal structure of V-spinel are lacking, which limits the efficient recovery of V resources from vanadium slag. In this study, the crystallization behavior of V-spinel in vanadium slag was investigated, and in situ separation of high-purity V-spinel crystals from vanadium slag was conducted via super-gravity at 1673 K. It was found that TiO2 content of 12 wt% in vanadium slag was the most conducive to the crystallization of V-spinel. On this basis, the crystal structures of various V-spinel crystals were characterized, by which the displacement mechanism of V and Ti in V-spinel was verified. Namely, V3+ in the octahedron sites was gradually replaced by Ti4+ with the increase of Ti content, while an equal amount of Fe3+ in the tetrahedron sites was replaced by Fe2+. This study provides some necessary theoretical basis for the efficient recovery of V resources in vanadium slag.
研究领域:
冶金学
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材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Biao Yuan,Pan Wu,Changjun Liu,Jian He,Wei Jiang
The challenge of separating and recovering V(V) and Cr(VI) from wastewater is critical for environmental protection and industrial productivity due to the chemical similarities. In this study, a novel zirconium-based adsorbent with superior adsorption performance and selectivity was synthesized using the Sol-Gel method, with a specific surface area of up to 265.3 m 2 /g. The maximum adsorption capacities of V(V) and Cr(VI) were 222 and 123 mg/g, respectively. The adsorption process followed the Langmuir isothermal adsorption and the pseudo-second-order kinetic model. The adsorption mechanism was thoroughly investigated confirming that the adsorption of V(V) and Cr(VI) on amorphous hydrous ZrO 2 (AHZOs) is chemisorption. At a pH of 3, the values of ΔG 0 (−46.8 kJ/mol) and E ads (−5.67 eV) for the main existing form H 3 V 10 O 28 3- on AHZOs are lower than those for the main existing form HCrO 4 - . V(V) replaced the adsorbed Cr(VI) during competitive adsorption to achieve selective adsorption of V(V) with a separation coefficient as high as 3142. The adsorption capacity of V(V) remains above 105 mg/g after five cycles. After adsorption, the purity of Cr(VI) can be increased to above 99.5 %, and a solution of V(V) with a purity higher than 99.25 % can be obtained after desorption. The use of 3 g/L and 100 g/L adsorbent can decrease the single V(V) and Cr(VI) to 1.618 mg/L and 0.36 mg/L, respectively, and meet the emission standards.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 16
·2227
·
IF 3
Hao Peng,Laixin Wang,Wenjing Pan,Sisi Yang,Jingjing Wang,Jielin Qin,Lihua Ao,Yinhe Lin,Jinzhu Tang
In this paper, histidine was applied to treat vanadium-containing wastewater. Several independent experimental parameters, including H2SO4concentration, dosage of histidine, reaction time and reaction temperature, were investigated and optimized through response surface methodology. The influence on the reduction process decreased in the following order: dosage of histidine > reaction temperature > reaction time. The reduction efficiency could be achieved at 95.77% under the following reaction conditions: H2SO4concentration of 0.2 mol/L, reaction temperature of 90 °C, dosage of histidine at n(His)/n(V) = 3.6, reaction time of 60 min and stirring rate at 500 rpm. The reduction kinetics was followed successfully with the pseudo-first-order kinetics model and theEafor reduction of vanadium was calculated to be 25.31 kJ/mol. The reduction kinetics was affected by these factors and the kinetics model could be described by an Equation. This paper provides a versatile strategy for treatment of wastewater containing V(V) and shows a bright tomorrow for wastewater treatment.
研究领域:
环境科学
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生物化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xiaofeng Yi,Shenhua Huang,Lu Chang,Zhaoshou Wang,Yuanpeng Wang
The redistribution process of arsenate (As(V)) and the variation in As(V) content in different locations must be clarified to ensure low mobility of As(V) during microbial ferrihydrite reduction. In this study, we investigated As(V) immobilization and redistribution processes when ferrihydrite was incubated with Geobacter sulfurreducens in the presence of titanium dioxide (TiO 2 ) nanoparticles . Our study results showed that, As(V) in the aqueous phase and ferrihydrite were redistributed on light minerals (goethite), heavy minerals (ferrihydrite and magnetite), and extracellular polymeric substances (EPS) induced by G. sulfurreducens during ferrihydrite reduction. Interestingly, we found that As(V) in the form of arsenate ion (AsO 4 3- ) was adsorbed by the functional groups of the EPS, while the formed Fe II 3 (As V O 4 ) 2 was wrapped in the network structure of EPS. Moreover, the addition of TiO 2 nanoparticles did not promote but delayed the entire ferrihydrite reduction, As(V) immobilization and redistribution processes. Furthermore, changes in the aqueous arsenic and iron concentrations are closely related to the formation time of secondary minerals. Our study findings provide new insights into the As(V) immobilization process mediated by G. sulfurreducens under anaerobic conditions .
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Hanyu Li,Yi Huang,Qing Luo,Jianing Liu
Treating water containing hazardous V(V) and Cr(VI) by using a efficient and simple method is an urgent need, but still a challenge. Novel binary composites (PEI-TNTs) were successfully synthesized by introducing polyethyleneimine (PEI) onto titanate nanotubes (TNTs) in a cost-effective and facile route, where TNTs and PEI existed as an interior core and an exterior shell. The removal efficiency of PEI-TNTs was highly reliant on the initial solution pH according to the batch adsorption experiments, and the maximum adsorption capacity for V(V) reached 1280.36 mg g −1 at pH 3.0 and for Cr(VI) reached 980.39 mg g −1 at pH 2.0 calculated by the Langmuir model. And PEI-TNTs effectively resisted the interference of various coexisting anions and cations. In simulated mining wastewater experiments, PEI-TNTs still remained fine V(V) and Cr(VI) adsorption capability; and PEI-TNTs could be regenerated and reused for 5 cycles without significantly reducing its removal efficiency. The excellent removal performance mainly owned to the high stability of inorganic skeleton and high surface activity from polymer modification. A comprehensive mechanism was proposed for the adsorption process associating with electrostatic attraction, redox reaction, and chelation. This work provides the theoretical and practical information for the novel inorganic–organic nanomaterials based on titanate nanotubes and polymers for the efficient reduction and adsorption of heavy metal anionic pollutants in water.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）