Nanomaterials
·
2022
·Vol. 12
·期 21
·3923
·
IF 5.719
Wen-Yi Wang,Tian Sang,Yan Zhong,Chao-Hao Hu,Dian-Hui Wang,Jun-Chen Ye,Ni-Ni Wei,Hao Liu
The surfactant modification of catalyst morphology is considered as an effective method to improve photocatalytic performance. In this work, the visible-light-driven composite photocatalyst was obtained by growing CdS nanoparticles in the cubic crystal structure of CdCO3, which, after surfactant modification, led to the formation of CdCO3elliptical spheres. This reasonable composite-structure-modification design effectively increased the specific surface area, fully exposing the catalytic-activity check point. Cd2+from CdCO3can enter the CdS crystal structure to generate lattice distortion and form hole traps, which productively promoted the separation and transfer of CdS photogenerated electron-hole pairs. The prepared 5-CdS/CdCO3@SDS exhibited excellent Cr(VI) photocatalytic activity with a reduction efficiency of 86.9% within 30 min, and the reduction rate was 0.0675 min−1, which was 15.57 and 14.46 times that of CdS and CdCO3, respectively. Finally, the main active substances during the reduction process, the photogenerated charge transfer pathways related to heterojunctions and the catalytic mechanism were proposed and analyzed.Keywords:surfactant;CdS/CdCO3;photocatalytic;Cr(VI)
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
Open Chemistry
·
2020
·Vol. 18
·期 1
·97-107
·
IF 1.216
Huayu Huang,Yang Wang,Yubin Zhang,Zhiying Niu,Xinli Li
Amino-functionalized graphene oxide (GO-NH 2 ) was synthesized by grafting (3-aminopropyl) triethoxysilane on the graphene oxide (GO) surface. The GO-NH 2 with high surface area and numerous active sites can efficiently adsorb Cr(VI), Cu(II), Pb(II) and Cd(II) ions. The maximum adsorption capacities of GO-NH 2 for Cr(VI), Cu(II), Pb(II) and Cd(II) were 280.11, 26.25, 71.89 and 10.04 mg g −1 , respectively. The pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic processes. The experimental data agreed well with the pseudo-second-order kinetic equation, and the adsorption of heavy metals onto GO-NH 2 occurs via chemical adsorption. The characteristics of Cr(VI), Cu(II), Pb(II) and Cd(II) in the GO-NH 2 adsorption processes were analyzed using the Langmuir and Freundlich isotherm models. The adsorption processes of Pb(II) and Cd(II) on GO-NH 2 were fit by the Langmuir model. The Freundlich isotherm model was well correlated to Cr(VI) and Cu(II). The GO-NH 2 is a promising material for the removal of heavy metal ions from industrial wastewater. This study provides an effective pathway to process industrial wastewater, and the GO-NH 2 has a good adsorption effect for the treatment of heavy metals in industrial wastewater.
研究领域:
环境科学
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化学工程
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材料科学
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水处理
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DOI
高影响因子
ANALYST
·
2015
·Vol. 140
·期 15
·5308-5316
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IF 4.107
Ting Wang,Jian Wang,Conglu Zhang,Zhao Yang,Xinpeng Dai,Maosheng Cheng,Xiaohong Hou
An attractive metal–organic framework (MOF) MIL-101(Cr) material was synthesized at the nanoscale and applied as a sorbent in the porous membrane-protected micro-solid-phase extraction (μ-SPE) device for the pre-concentration of phthalate esters (PAEs) in drinking water samples for the first time. Parameters influencing the extraction efficiency, such as the selection of sorbent materials, pH adjustment, the effect of salt, magnetic-stirring extraction time, the desorption solvent and the desorption time, were investigated. Under the optimum conditions, the limits of detection from gas chromatography-mass spectrometric analysis for PAEs varied from 0.004 to 0.02 μg L−1. The linear ranges were from 0.1 to 50 μg L−1 or from 0.2 to 50 μg L−1 for the analytes with the relative standard deviations fluctuating from 0.8 to 10.9% (n = 5). The enrichment factors (EFs) for the target PAEs were varied from 143 to 187. MIL-101(Cr) exhibited remarkable advantages compared to activated carbon and MIL-100(Fe). On the other hand, the computational method was first used to predict the adsorption of MIL-101(Cr) towards PAEs. The molecular interactions and the free binding energies between MIL-101(Cr) and PAEs were observed and calculated in terms of the molecular modeling method. MIL-101(Cr) showed high potential in the analysis of PAEs at trace levels in drinking water. The computational result was consistent with the detected enrichment factors. The computational modeling accurately predicted the extraction efficiency of MOF-based material towards the target analytes. Therefore, the combination of experimental and computational study provided a new strategy on the trace contaminant analysis.
研究领域:
分析化学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xiao Tan,Yinjie Zhang,Meng Liu,Jinman Cao,Guilan Duan,Jun Cui,Aijun Lin
Cr(VI) contamination in aquatic systems has been a challenge for environmental science researchers. To environmental-friendly, stable, and efficiently remove Cr (VI), a novel layered double hydroxide was prepared through the ultrasonic-assisted co-precipitation method. The ultrasonic-assisted step prevented the Fe 2+ oxidation, improved the morphology and performance, and finally, the adsorption-coupled reduction capacity and stability were enhanced. By adding U–Fe/Al-LDH (1.0 g/L) for Cr(VI) (100 mg/L), the removal rate reached 82.24%. The removal data were well fitted by the pseudo-second-order kinetic and Langmuir isotherm model. Using U–Fe/Al-LDH can be performed over a wide pH range (2–10), with a theoretical maximum removal capacity of 118.65 mg/g. The Cr(VI) with high toxicity was adsorbed and reduced to low-toxicity Cr(III). In the final phase, stable Cr(III) complex precipitates were generated. After 30 days, the dynamic leaching amounts of total Cr in used U–Fe/Al-LDH-2 were 0.1052 mg/L. Combined with the results of the influence experiment of coexisting anions and oxidants and the SO 4 2− release experiment, the stability of the removal effect and the safety of U–Fe/Al-LDH were proved. In conclusion, U–Fe/Al-LDH-2 is a promising remediation agent and a feasible Cr(VI) removal method for the practical remediation.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Meng Li,Chunxia Tang,Shaohai Fu,Kam Chiu Tam,Yongzhong Zong
The reduction and sequestration of toxic Cr(VI) via a one-step process in an aqueous solution is critical to eliminate its environmental risk. In this study, amine functionalized cellulose-based aerogel beads (CGP) was developed for simultaneous and efficient adsorption- reduction- sequestration of Cr(VI). CGP showed a maximum Cr(VI) adsorption capacity of 386.40 mg/g at 25 °C due to its strong electrostatic attraction towards Cr(VI). The simultaneous Cr(VI) adsorption- reduction- sequestration performance of CGP over a wide Cr(VI) concentration range was examined. The mechanism was investigated in-depth via the analysis of adsorption kinetics , XPS spectra, and FTIR spectra. Moreover, the Cr immobilization stability of CGP after adsorption was evaluated in simulated neutral, acidic, and alkaline conditions. The effect of pH, temperature, ionic strength and the presence of interfering ions on CGP adsorption performance were investigated by batch adsorption experiments. Fixed-bed column adsorption study was performed to explore the application potential of CGP beads in a wastewater treatment process.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Ying Li,Haibo Zhao
Ethylene production via chemical looping oxidative dehydrogenation (CL-ODH) of ethane faces a critical challenge in balancing conversion efficiency and selectivity due to competing oxygen species requirements. Here, we present a bifunctional composite catalyst (CrH/BiCZ) by physically integrating a Cr-HZSM5 (Cr-H) dehydrogenation (DH) catalyst with a Bi 2 O 3 -Ce 0.4 Zr 0.6 O 2 (Bi-CZ) selective hydrogen combustion (SHC) catalyst. This tandem system decouples ethane activation and hydrogen combustion, promoting the DH process of ethane through the in situ hydrogen combustion of the SHC catalyst. The Ce-Zr solid solution in Bi-CZ acts as an oxygen reservoir, enabling complete H 2 combustion within 3 min and suppressing carbon deposition. This rapid hydrogen combustion shifts the reaction equilibrium towards ethylene production. At 650 °C, the optimized CrH/BiCZ catalyst achieves 84.1 % ethylene selectivity at 43.0 % ethane conversion, and maintains exceptional stability over 36 redox cycles. This work establishes a scalable chemical looping strategy for efficient ethylene synthesis.
研究领域:
催化
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化学工程
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材料科学
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反应工程
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能量转换
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DOI
高影响因子
Science Bulletin
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2025
·
IF 21.1
Ergui Luo,Jingyi Liang,Kexuan Zhang,Xian Wang,Luozhen Jiang,Tianjun Hu,Junming Zhang,Junjie Ge,Jianfeng Jia
Electrochemical two-electron oxygen reduction reaction (2e − ORR) serves as an appealing approach for green hydrogen peroxide (H 2 O 2 ) production. However, the corresponding progress in efficient non-precious metal catalysts for acidic 2e − ORR has not kept pace, with the research model being almost confined to Co-based system. Here, guided by molecular dynamics simulations, the active nature and origin of pyrolyzed Cr−N 4 catalysts for ORR are unveiled, wherein the over-strong oxygen affinity of the Cr center is counterbalanced by a spontaneous axial O-coordination. By creating an oxidation-induced electron-deficient environment, the Cr−N 4 can be flexibly tailored for selective H 2 O 2 formation. A single-atom Cr−N 4 /C(O) catalyst is developed experimentally, which rivals and even slightly outperforms its Co-based counterpart in terms of selectivity (92% versus 71%) and productivity (202 versus 145 mmol g cat −1 h −1 ) for H 2 O 2 . More encouragingly, the Cr-based catalysts exhibit minimal reactivity towards H 2 O 2 -related side reactions, with the metal component being robust against leaching. This research marks the first identification of pyrolyzed Cr−N 4 catalysts as competent for acidic two-electron O 2 reduction to H 2 O 2 . The innovative models and insights offer profound guidance for the design of future-generation catalysts for electrochemical H 2 O 2 synthesis.
研究领域:
电催化
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材料科学
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能源化学
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可持续化学
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计算化学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
·
IF 21.1
Shufan Yu,Zhao Sun,Zhiqiang Sun
Methanol steam reforming is a promising approach for real-time hydrogen production, while its practical application is hindered by catalyst deactivation and undesired CO byproduct formation. In this study, we propose a self-activation approach to anchoring a series of x CuO/YCrO 4 catalysts by employing methanol and steam as reductants. The self-activated 0.8CuO/YCrO 4 catalyst achieves a high hydrogen production rate of 22.3 μmol H 2 ·g −1 cat ·s −1 and demonstrates exceptional stability over 3000 min at 220°C. TEM-EDS, XPS, EPR, and XAS collectively reveal the promotion of generating Cu δ + /Y-O v -Cr interfacial sites and oxygen vacancies via self-activation, and in situ Raman spectroscopy confirms the structural stability of the Y-O v -Cr framework. In situ DRIFTS analysis further confirms that Cu δ + /Y-O v -Cr interfacial sites effectively anchor and promote the hydrogenation of bidentate formate intermediates, mitigating active site blockage by byproduct species and enhancing catalytic efficiency. This work provides new insights into the self-activation mechanism of Cu-based catalysts and offers a promising strategy for developing highly active and durable catalysts.
研究领域:
催化化学
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制氢技术
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材料科学
·
表面化学
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化学工程
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纳米技术
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 34
·15503-15513
·
IF 3.591
Xu Yang,Yuhong Zhou,Zhaojie Sun,Chunhui Yang,Dongyan Tang
The integrated combination of zeolitic imidazolate framework-8 (ZIF-8) into electrospun fibers and surface functioned polyacrylonitrile (PAN) fibers with polydopamine (PDA) both showed great potential in the removal of heavy metal ions (such as Cr(VI)) from aqueous solution in our previous works. Based on these results, here we report a more facile strategy to fabricate composite ZIF-8@PDA/PAN fibers as efficient adsorbents by PDA coating assisted ZIF-8 continuous growth on electrospun PAN fibers. Benefiting from the abundant functional groups (including amino and hydroxyl) of PDA, ZIF-8 particles effectively grew and were loaded on the surface of fibers with uniform distributions and thicker ZIF-8 layers were obtained easily by prolonging the reaction time. The obtained composite ZIF-8@PDA/PAN fibers retained higher surface areas (the maximum of 299.9 m2 g−1) and appropriate pore sizes, meanwhile they exhibited super hydrophilicity and good water stability, which are well known to be vital for the removal of Cr(VI). Thus, the composite fibers exhibited significant removal efficiency (especially more than 90% at a lower initial Cr(VI) concentration) and also higher adsorption capacity (with a maximum of 212.7 mg g−1) and good recyclability.
研究领域:
材料科学
·
环境工程
·
化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yanfang Li,Kang Xu,Huilin Hu,Lixia Jia,Yizhong Zhang,Ciren Zhuoga,Pengli Yang,Xin Tan,Wanqian Guo,Weichang Hao,Tao Yu,Jinhua Ye
Constructing atomic-level cation vacancies is an effective strategy to modulate the electronic properties of host materials, thus promoting charge transfer and redox reaction kinetics. Herein, ultrathin Bi 24 O 31 Br 10 nanosheets with cationic vacancy was synthesized via an inventive precipitation strategy by adding appropriate arginine. The difunctional arginine can changes the pH of the synthetic system and selectively deprive Bi atoms on the surface to form Bi vacancies through strong affinity between functional groups and cations. The abundant Bi vacancy decrease the Gibbs free energy change and provide channels to promote bulk adsorption of Cr(VI), thus effectively reduces the carrier migration distance during in situ bulk photocatalytic reduction of Cr(VI) and induces the formation of new impurity states to improve the utilization of visible light. Bi vacancy mitigates strong excitonic effects confined by significantly reducing exciton binding energies, thus effectively promote the separation of photo-generated charges and suppress reorganization of photon-generated carrier. Benefiting from these merits, these exclusive V Bi -Bi 24 O 31 Br 10 ultra-thin nanosheets exhibit superior reduction performance for Cr(VI), and the removal rate was more than 90% at universal pH (2–10). This work provides a new idea for the construction of cation vacancies and a feasible method for the removal of Cr(VI) under alkaline conditions.
研究领域:
材料科学
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环境科学
·
化学
·
纳米技术
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Dashi Lei,Chunli Gou,Chunli Wang,Juanqin Xue,Zhongshen Zhang,Weizhen Liu,Zhang Lin,Jing Zhang
The reduced chromite ore processing residue (rCOPR) deposited in environments is susceptible to surrounding factors and causes reoccurrence of Cr(VI). However, the impact of natural sunlight on the stability of rCOPR is still unexplored. Herein, we investigated the dissolution and transformation behaviors of Cr(III)–Fe(III) hydroxide, a typical Cr(III)-containing component in rCOPR, under visible light. At acidic conditions, the release rate of Cr(III) under illumination markedly increased, up to 7 times higher than that in the dark, yet no Cr(VI) was produced. While at basic conditions, only Cr(VI) was obtained by photo-oxidation, with an oxidation rate of ∼7 times higher than that by δ-MnO2 under dark conditions at pH 10, but no reactive oxygen species was generated. X-ray absorption near-edge structure and density functional theory analyses reveal that coexisting Fe in the solid plays a critical role in the pH-dependent release and transformation of Cr(III), where photogenerated Fe(II) accelerates Cr(III) produced at acidic conditions. Meanwhile, at basic conditions, the production of intermediate Cr(III)–Fe(III) clusters by light leads to the oxidation of Cr(III) into Cr(VI) through the nonradical “metal-to-metal charge transfer” mechanism. Our study provides a new insight into Cr(VI) reoccurrence in rCOPR and helps in predicting its environmental risk in nature.
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Shuang Li,Te Wei,Guojuan Ren,Fang Chai,Hongbo Wu,Fengyu Qu
A simple and highly practical colorimetric method has been proposed for detection of chromium ions (Cr 3+ and Cr 6+ ) synchronously by sodium hyaluronate functionalized gold nanoparticles (SH-AuNPs). The SH-AuNPs were synthesized and characterized by UV–vis spectra and transmission electron microscopy (TEM). The colorimetric response of Cr 3+ and Cr 6+ can be performed simultaneously by the same probe SH-AuNPs, based on the property of special localized surface plasmon resonance (LSPR). The interaction between chromium ions and sodium hyaluronate causes rapid aggregation of the SH–AuNPs conjugates and a concurrent color conversion from wine red to blue gray which is clearly detectable by the naked eye. By using SH-AuNPs as colorimetric probe, the color change with 3 μM Cr 3+ , 1 μM Cr 6+ , or 10 μM mixed chromium ions can be recognized easily by naked eye with highly selectivity. The detection limit calculated by the linear relationship of LSPR were at 0.78 nM (for Cr 3+ ), 2.90 nM (Cr 6+ ) and 0.69 nM (mixed chromium ions) respectively, which were all below the guideline value set by World Health Organization (0.962 μM). The practical applicability of the SH-AuNPs was also verified by the detection of chromium ions in natural lake water samples.
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高影响因子
危险品化学品经营许可证（带存储）