DYES AND PIGMENTS
·
2023
·
IF 4.5
Chunhong Gao,Jinjia Liu,Meilin Jia,Gala Sa,Aiju Xu
Photocatalytic technology has broad prospects in the degradation of organic pollutants due to its green, energy-saving and high-efficiency characteristics. In this study, TiO 2 and V–TiO 2 were prepared by hydrothermal method , and the catalysts were tested by experimental and theoretical calculations under a 400 W metal halide lamp degradation efficiency for aniline (30 mg/L). The synthetic photocatalysts were characterized by XRD , HRTEM , FT-IR, XPS , UV–Vis DRS , PL , EIS , and photocurrent , the results showed that the edges of the V-doped TiO 2 absorption band were redshifted, the band gap value were reduced, the photocatalytic activity were improved, and the PL showed e − /h + had the lowest composite rate for 1.5 mol%V–TiO 2 and broadens the optical response range. 1.5 mol% V was the optimal value for photodegrading aniline, and moderate V modification can significantly inhibit the complexation of e − /h + pairs. Finally, stability measurements performed over 5 cycles show that 1.5 mol%V–TiO 2 has excellent stability. The calculation results show that the optical band gap of V–TiO 2 were significantly reduced, the photocatalytic performance of V–TiO 2 were greatly enhanced.
研究领域:
环境科学
·
材料科学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Ying Zhang,Ting-An Zhang,David Dreisinger,Weihua Zhou,Feng Xie,Guozhi Lv,Weiguang Zhang
In the current study, a novel chelating extractant Mextral 973H was employed to selectively extract V(V) from a low pH sulfuric acid solution containing high concentration of Fe (Ш). The extraction of V(V) is strongly dependent on solution pH, and the separation coefficient (β (V/Fe) ) between V(V) and Fe(Ш) can be greater than 720 when the solution pH < 0.5. A cation exchange between H and VO 2 + was proposed as the main extraction mechanism at pH < 1.5, while at pH > 1.5, a solvating reaction between the extractant and metal-oxo cluster anions took place. The effects of solution pH, acid medium types, contacting time and temperatures on the extraction and separation of V have been discussed. FT-IR and 1 HNMR were applied to confirm the extraction mechanism and also the degradation behavior of Mextral 973H in some extreme conditions. The loaded vanadium was effectively stripped using a diluted 0.2 M Na 2 CO 3 solution and a total stripping extent of 97% was achieved. The extraction process by Mextral 973H was finally simulated using Aspen Plus simulator comparing to traditional process, the results obtained were in good recovery efficiency and with the advantage of acid and alkali saving.
研究领域:
化学工程
·
环境科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 27
·70731-70741
·
IF 5.8
Lin Ruixi,Li Jiarong,Jing Xuequan,Guo Meina,Ren Guoqing,Qin Haonan,Yao Zhangwei,Wan Yinhua,Song Weijie,Zeng Huifeng,Yang Feifei,Zhao Da,Hu Kang
Adsorption of vanadium from wastewater defends the environment from toxic ions and contributes to recover the valuable metal. However, it is still challenging for the separation of vanadium (V 5+ ) and chromium (Cr 6+ ) because of their similar properties. Herein, a kind of CeO 2 nanorod containing oxygen vacancies is facilely synthesized which displays ultra-high selectivity of V 5+ against various competitive ions (i.e., Fe, Mn, Cr, Ni, Cu, Zn, Ga, Cd, Ba, Pb, Mg, Be, and Co). Moreover, a large separation factor ( SF V/Cr ) of 114,169.14 for the selectivity of V 5+ is achieved at the Cr 6+ /V 5+ ratio of 80 with the trace amount of V 5+ (~ 1 mg/L). The results show that the process of V 5+ uptake is the monolayer homogeneous adsorption and is controlled by external and intraparticle diffusions. In addition, it also shows that V 5+ is reduced to V 3+ and V 4+ and then formation of V–O complexation. This work offers a novel CeO 2 nanorod material for efficient separation of V 5+ and Cr 6+ and also clarifies the mechanism of the V 5+ adsorption on the CeO 2 surface.
研究领域:
环境科学
·
材料科学
·
化学工程
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 50
·76263-76274
·
IF 5.19
Zhou Anhui,Qiu Zhaofu,Yang Ji,Yan Ruiqi
The all-vanadium redox flow battery (VRFB) is becoming a promising technology for large-scale energy storage due to its advantages such as scalability and flexibility. In recent years, the VRFB has been successfully developed and put into use in many countries. It is expected that the abandoned VRFB will generate a large amount of vanadium waste. To our knowledge, there are few reports on the disposal of spent VRFBs. Herein, chitosan-coated nano-zero-valent iron (CS-Fe 0 ) is proposed for the first time as adsorbents for the treatment of spent VRFBs. It can provide a new approach to deal with the upcoming large number of spent VRFBs. The calculated maximum adsorption capacity for V(V) of chitosan and CS-Fe 0 reached 209.5 and 511.3 mg/g at 288 K, respectively. CS-Fe 0 showed better adsorption performance than chitosan under different pH conditions and is easy to be separated from the liquid phase. The Freundlich isotherm was suitable for the adsorption process of chitosan, and CS-Fe 0 was more consistent with the Langmuir isotherm. Ionic strength (0.05–0.5 M) had a positive effect on the adsorption capacity of CS-Fe 0 , and the influence of coexisting anions on CS-Fe 0 could be negligible. FTIR and XPS analyses revealed that the primary mechanisms were the electrostatic attraction of chitosan and redox of Fe 0 . The present study confirmed that CS-Fe 0 could be a potential material to efficiently trap V(V) from the VRFB electrolyte.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Fangyuan Yang,Feiyu Zhu,Hao Shi,Xuzhen Dong,Jie Sheng,Jinlong Zhou
In this experiment, PAN/Fe3O4@CTAB magnetic nanofibers (average diameter of 386 nm) were prepared by electrospinning for the removal of As(V) from an aqueous solution. Material characterization was analyzed using phase analysis of X-ray diffraction (XRD), a Fourier transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), and thermogravimetric analysis (TG), which demonstrated that the magnetic nanoparticles were successfully incorporated into the fiber membrane. Batch adsorption experiments revealed that the process followed pseudo-second-order kinetics and Langmuir isotherm models, achieving a maximum adsorption capacity of 138.66 mg/g, higher than that of unmodified PAN/Fe3O4 (93.59 mg/g). The adsorption efficiency of this adsorbent was high (97% removal in 300 min) and remained at 91% after five regeneration cycles (initial value of 98.65%). The response surface methodology (RSM) was also employed to construct and analyze the model to investigate the effects of three critical adsorption parameters, pH, adsorption time, and adsorbent concentration, on As(V). The optimal conditions for adsorption were determined to be a pH of 3.81, an adsorption time of 342 min, and an adsorbent concentration of 1.36 g/L, achieving an arsenic ion removal rate of 98.62%. The experimental results were found to be in accordance with the theoretical parameters, thereby providing further evidence that the synthesized material is an excellent adsorbent for the treatment of water pollution.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
Royal Society Open Science
·
2018
·Vol. 5
·期 6
·
IF 2.504
Cheng Wang,Liya Hu,Meiyin Wang,Bin Yue,Heyong He
A series of Cex-V-g-C3N4 catalysts with different cerium content were synthesized by a facile co-assembly method. Compared with pure V-g-C3N4 catalyst, the addition of cerium facilitated the high dispersion of vanadium species as well as the benzene adsorption ability of the corresponding catalysts. Also, the existence of cerium promoted the partial reduction of vanadium species, which improved the redox property of vanadium species as the active centres. The Cex-V-g-C3N4 catalysts showed considerably improved activity in the benzene hydroxylation reaction compared with V-g-C3N4 catalyst. Among the catalysts studied, Ce0.07-0.07 V-g-C3N4 exhibited the best catalytic activity with a benzene conversion of 33.7% and a phenol yield of 32.3% with good structural and catalytic stability, while only 24.7% of benzene conversion and phenol yield of 24.2% were obtained over 0.07 V-g-C3N4.
研究领域:
化学工程
·
催化材料科学
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PubMed
高影响因子
AICHE JOURNAL
·
2022
·Vol. 69
·期 4
·e17933
·
IF 4.167
Wei Xie,Yiping Guo,Jianping Li,Honglai Liu,Jun Hu
Metal organic frameworks (MOFs) have shown promising adsorptive desulfurization (ADS) capacity yet remains great challenges to maintain excellent performance in presence of water. Guided by the density function theoretical (DFT) calculations, we select bromine modified linkers with different substitution degrees to construct MIL-47-xBr to regulate the porosity and hydrophobicity. The optimized MIL-47-Br exhibits the highest saturation dibenzothiophene (DBT) capacity of 179.2 mgS g −1 from the hydrous oil, surpassing the record of all ADS adsorbents. Meanwhile, the excellent selectivity, adsorption kinetics, and recycle stability endow MIL-47-Br with superior ADS performance from the commercial hydrous gasoline. With the DBT capacity decreases by only 12.3% from the commercial gasoline, a continue flow ADS is successfully achieved on the fixed-bed of MIL-47-Br column. Therefore, this facial strategy of simple substitution can fully exploit the functions of open metal sites for enhancing the task-specific selectivity, and has a promising application prospect in industrial ADS.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yezi He,Jerosha Ifthikar,Lie Yang,Zhuqi Chen
A cross-linked chitosan-modified birch sawdust biochar (CS@BSBC) was prepared and applied for the simultaneous elimination of vanadium (Ⅴ) and sulfamethoxazole (SMX) from livestock wastewater. The adsorption capacity of V(V) reached 110 mg/g alone while this value was promoted to 150 mg/g for the simultaneous removal of SMX and V(V), and the adsorption effect is optimal at pH 3. The adsorption capacity of SMX reached about 30 mg/g alone, while the SMX’s adsorption capacity droped to 25 mg/g for the simultaneous removal of SMX and V(V). The mechanism studies disclosed that redox reactions occur on the surface of CS@BSBC. As revealed by the XPS spectra, 63 % of V(V) was reduced to V(IV) concurrently pyrolic nitrogen and C−O terminals were oxidized to nitrogen oxide and C O. The treatment mechanism of CS@BSBC described above can provide a reference for the subsequent treatment of livestock wastewater with complex composition and high vanadium content.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Zhicheng Wu,Xiaobao Su,Zhang Lin,Gary Owens,Zuliang Chen
The application of green synthesized iron nanoparticles ( n Fe) for the removal of arsenic (As) from contaminated sites has often been proposed as one of the most promising remediation methods. In this work, TEM analysis showed that As(V) was uniformly adsorbed on the surfaces of n Fe, while FTIR analysis confirmed that adsorption was mainly via an Fe O As bond, and XPS analysis indicated that only As(V) was adsorbed. Hence, the removal mechanism proposed for As(V) is based on initially n Fe reacting with As(V) to form a monodentate chelating ligand and subsequently a bidentate binuclear complex. The initially high surface area (51.14 m 2 g −1 ) of n Fe was decreased by half (26.03 m 2 g −1 ) after As(V) adsorption, where the materials high As(V) adsorption capacity(21.59 mg g -1 ) was attributed to unique properties derived from the green synthesis. Adsorption isotherm modeling indicated that As(V) adsorption by n Fe best fit the Langmuir equation (R L 2 = 0.9903), and thus suggested chemisorption was occurring. The adsorption also fitted the pseudo second-order kinetic rate equation well, which confirmed that adsorption was via chemisorption. Overall, the green synthesis of n Fe exhibited great application potential for As(V) removal due to high As(V) adsorption capacity and simplicity of synthesis.
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
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 17
·4172
·
IF 3.1
Wei Ding,Shenxu Bao,Yimin Zhang,Bo Chen,Zhanhao Wang
Antimony (Sb) migration in soil and water systems is predominantly governed by its adsorption onto ferrihydrite (FH), a process strongly influenced by natural organic matter. This study investigates the adsorption behavior, stability, and mechanism of FH and FH–humic acid (FH-HA) complexes on Sb(V), along with the fate of adsorbed Sb(V) during FH aging. Batch adsorption experiments reveal that initial pH and concentration significantly influence Sb(V) sorption. Lower pH levels decrease adsorption, while higher concentrations enhance it. Sb(V) adsorption increases with prolonged contact time, with FH exhibiting a higher adsorption capacity than FH-HA complexes. Incorporating HA onto FH surfaces reduces reactive adsorption sites, decreasing Sb(V) adsorption. Adsorbed FH-HA complexes exhibit a higher specific surface area than co-precipitated FH-HA, demonstrating stronger Sb(V) adsorption capacity under various conditions. X-ray photoelectron spectroscopy (XPS) confirms that Sb(V) adsorption primarily occurs through ligand exchange, forming Fe-O-Sb complexes. HA inhibits the migration of Sb(V), thereby enhancing its retention within the FH and FH-HA complexes. During FH transformation, a portion of Sb(V) may replace Fe(III) within converted iron minerals. However, the combination of relatively high adsorption capacity and significantly lower desorption rates makes adsorbed FH-HA complexes promising candidates for sustained Sb adsorption over extended periods. These findings enhance our understanding of Sb(V) behavior and offer insights for effective remediation strategies in complex environmental systems.
研究领域:
环境科学
·
土壤学
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PubMed
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-7
·
IF 12.121
Chen Yunxu,Liu Jinxin,Zeng Mengqi,Lu Fangyun,Lv Tianrui,Chang Yuan,Lan Haihui,Wei Bin,Sun Rong,Gao Junfeng,Wang Zhongchang,Fu Lei
Ultra-thin III–V semiconductors, which exhibit intriguing characteristics, such as two-dimensional (2D) electron gas, enhanced electron–hole interaction strength, and strongly polarized light emission, have always been anticipated in future electronics. However, their inherent strong covalent bonding in three dimensions hinders the layer-by-layer exfoliation, and even worse, impedes the 2D anisotropic growth. The synthesis of desirable ultra-thin III–V semiconductors is hence still in its infancy. Here we report the growth of a majority of ultra-thin III–V single crystals, ranging from ultra-narrow to wide bandgap semiconductors, through enhancing the interfacial interaction between the III–V crystals and the growth substrates to proceed the 2D layer-by-layer growth mode. The resultant ultra-thin single crystals exhibit fascinating properties of phonon frequency variation, bandgap shift, and giant second harmonic generation. Our strategy can provide an inspiration for synthesizing unexpected ultra-thin non-layered systems and also drive exploration of III–V semiconductor-based electronics.
研究领域:
材料科学
·
半导体物理
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DOI
高影响因子
CURRENT MICROBIOLOGY
·
2012
·Vol. 65
·期 6
·733-741
·
IF 1.815
Wang Shuzhi,Pan Xiangliang
In this study, effects of antimony Sb(V) on growth, pigments content, oxygen evolution, and photosystem II (PSII) activity of Microcystis aeruginosa were investigated. JIP-test, Q
− A
reoxidation kinetic test and S-state test were used in this study to study the energy distribution and electron transport in PSII. Treatment with Sb(V) at various concentrations ranging from 5 to 100 mg/l had long-term effects on growth, pigments content, and oxygen evolution of M . aeruginosa . Low concentration of Sb(V) had no significant inhibition of the biomass production and PSII activity but inhibited the pigment synthesis. Growth, pigments content, oxygen evolution, and PSII activity were seriously inhibited when treated by high concentration of Sb(V) (100 mg/l). The target sites of Sb(V) toxic effect on the PSII of M . aeruginosa were mainly on the donor side and the apparatus in the light-dependent reaction. The quantum yield for photochemistry, density of reaction centers and photosynthesis performance index decreased, whereas the dissipated energy increased. PSII activity of M . aeruginosa was promoted when exposure to 50 mg/l Sb(V) by increasing the density of active reaction centers and electron transport after Q
− A
.
研究领域:
环境科学
·
微生物学
·
植物生理学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）