Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 7
·3935-3943
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IF 7.443
Dongfang Hou,Xianluo Hu,Wingkei Ho,Pei Hu,Yunhui Huang
Novel porous Cr-doped SrTiO3 nanotubes were fabricated using a simple and economical electrospinning technique with subsequent calcination. The average outer diameter of the nanotube was approximately 100 nm, and the multimodal porous netlike framework with high specific surface area was favorable for light harvesting and matter diffusion. Photocatalytic activity was evaluated by degradation of azo dye acid orange 7 and removal of NO under visible light irradiation. The enhanced photocatalytic activity of porous Cr-doped SrTiO3 nanotubes was attributed to the one-dimensional tube-like architecture, high specific surface area, multimodal pore size distribution, and proper Cr doping.
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CELLULOSE
·
2022
·Vol. 29
·期 6
·3389-3406
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IF 6.123
Lang Daning,Xu Xia,Wu Ronglan,Wang Wei,Shi Ming,Jia Ke,Chen Shifei,Wang Jide
A cellulosic material has been synthesized that could efficiently and selectively adsorb organic and inorganic contaminants from aqueous solutions without interference from competing adsorption sites. Cellulose-graft-tetraethylenepentamine molecular imprinted polymer (C-TEPA-MIP) was synthesized by using 4-nitrophenol (4-NP) as the template. The C-TEPA-MIP adsorbent could adsorb 4-NP and Cr(VI) simultaneously and selectively, without being affected by the competitive adsorption sites of each of these pollutants. The adsorption of 4-NP was predominantly due to the imprinted sites of 4-NP in C-TEPA-MIP that were located inside of the adsorbent, whereas that of Cr(VI) was primarily due to the amine groups of TEPA found on the surface of the adsorbent. Compared with the non-imprint polymer synthesized without the template, C-TEPA-MIP showed higher selectivity for both 4-NP and Cr(VI) in unitary and binary systems. In addition, C-TEPA-MIP exhibited good stability and recyclability for 4-NP, which makes it a promising candidate material for applications concerning wastewater treatment. Graphical abstract
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APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Lei Wang,Haris Muhammad,Minwang Laipan,Xiaohu Fan,Junkang Guo,Yongtao Li
The demand for clean water and soil drives high efficiency, less expensive, and eco-friendly clay-composites as adsorbents for remediation of heavy metals polluted environment. We have developed a new water remediation technique by using an organic-inorganic composite, L-cysteine doped polypyrrole modified bentonite (L-cys/PPy/BT) for removal of Cr(VI) and Mo(VI). The L-cys/PPy/BT showed maximum adsorption capacities of 318.5 and 65.4 mg/g for Cr(VI) and Mo(VI) respectively. For Cr(VI) and Mo(VI) the sorption process on L-cys/PPy/BT followed the Freundlich and Langmuir isotherm models, respectively. Furthermore, the pseudo-second-order kinetic model described the adsorption behavior of Cr(VI) and Mo(VI). Moreover, the thermodynamic parameters indicated that sorption processes were endothermic and spontaneous. Mechanistic assessment revealed that adsorption of Mo(VI) on L-cys/PPy/BT could be attributed to chelation, electrostatic attraction and ion-exchange of Mo(VI) with the imine/amine functional groups in the material's matrix , while electrostatic attraction, ion exchange, chelation and redox reaction played a significant role in the removal of Cr(VI). This research provides a new approach for the use of clay materials as potential sorbents for removal of heavy metal ions in contaminated water .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Wanqing Zhang,Zhongyin Zhang,Yuanchao Li,Jun Chen,Xiaobo Li,Yadong Zhang,Yuping Zhang
A novel MIL-101(Cr)/XC-72 modified glassy carbon electrode (GCE) sensor was fabricated to determine chloramphenicol (CAP). The electrochemical sensors were constructed by using MIL-101(Cr), XC-72, MIL-101(Cr)/XC-72, and their electrochemical performances were studied with cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. In comparison with the GCE , MIL-101(Cr)/GCE and XC-72/GCE sensors, the MIL-101(Cr)/XC-72/GCE sensor exhibited a well-defined redox peak towards CAP in phosphate buffer solution (PBS). The effects of the ratio of MIL-101(Cr) and XC-72, accumulation time, scan rate, and pH value were carefully considered. Under the optimized conditions, the sensor exhibited excellent response for CAP. The linear concentration ranges of CAP were from 1.0 × 10 −8 to 2.0 × 10 −5 M (R 2 = 0.985), with a low detection limit of 1.5 × 10 −9 M (S/N = 3). Furthermore, the MIL-101(Cr)/XC-72/GCE sensor was successfully applied to the determination of the real samples with satisfactory recoveries.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Junying Yu,Yin Ren,Luming Zhou,Peng Ye,Lin He,Yahong Wang,Yingrui Chen,Chunlin Fu
The trade-off between power conversion efficiency (PCE) and average visible transmittance (AVT) in semi-transparent solar cells significantly restricts their application in building-integrated photovoltaics. Bismuth ferrite (BiFeO 3 , BFO)-based materials have shown great potential to address this trade-off due to their inherent ferroelectric properties and tunable optical bandgap. However, even with performance optimization through chemical doping, a considerable bottleneck remains. Using the Ca/Cr co-doped BFO system as an example—whose optimal composition still exhibits a PCE below 1.4 %—this study proposes a new strategy of physical thickness control to overcome the limitations of chemical doping. By systematically investigating the influence of the thickness (200–350 nm) of the Ca/Cr co-doped BFO layer with optimal composition on device performance, it was found that increased thickness significantly enhances light absorption and optimizes the distribution of the built-in electric field. The results demonstrate that at a thickness of 336 nm, the device achieves the best photovoltaic performance (PCE = 1.86 %, open-circuit voltage ( V oc ) = 1.57 V, short-circuit current density ( J sc ) = 2.30 mA/cm 2 ), representing an improvement of over 35 % compared to the reference thickness (210 nm). Meanwhile, at a thickness of 285 nm, the device maintains a relatively high AVT (33.70 %) and achieves the highest light utilization efficiency (LUE = 0.6100 %). Electrical impedance spectroscopy analysis indicates that increased thickness effectively reduces the carrier recombination probability. This study reveals the synergistic mechanism of thickness regulation through “light absorption–built-in electric field–carrier transport” in balancing PCE and AVT, providing a reliable optimization strategy for semi-transparent ferroelectric photovoltaic devices.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Ziyang Xu,Zicheng Yang,Jiale Ni,Yi Feng,Jianfeng Yao
The functionalization of metal organic frameworks (MOFs) with tailored ligands offers a promising pathway for enhancing their catalytic performance in CO 2 fixation. This work systematically explores the impact of ligand engineering in MIL-101(Cr) through carboxyl (–COOH) and amino (–NH 2 ) functionalization for the CO 2 cycloaddition reaction. Comprehensive characterizations of pristine MIL-101 and functionalized MILs involving MIL-101-COOH, MIL-101-NH 2 , and MIL-101-COOH/NH 2 reveal that –COOH functionalization significantly enhances the surface area (2717 m 2 /g) and reduces the activation energy (17.1 kJ/mol vs. 23.1 kJ/mol for pristine MIL-101), whereas –NH 2 groups improve the CO 2 binding strength but compromise the crystallinity and surface area (532 m 2 /g). Under mild conditions (80 °C and 0.1 MPa CO 2 ), MIL-101-COOH achieves >99 % yield for CO 2 cycloaddition with epichlorohydrin at 8 h and maintains stability over ten cycles, outperforming other MILs (72–82.5 % yields). This work establishes ligand engineering, especially –COOH functionalization, as a critical strategy to optimize MILs for CO 2 fixation to produce cyclic carbonates.
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高影响因子
Nanoscale
·
2025
·
IF 5.1
Wei Zhao,Yuxiang Yang,Yanbin Li,Yimin Liu,Yuezhou Wei,Xinpeng Wang,Deqian Zeng
The advancement of efficient photocatalysts is essential for tackling global energy and environmental issues. In this work, a unique sheet-on-sheet Cd(OH)2/CdS photocatalyst was synthesized via a facile solution strategy, demonstrating significantly improved photocatalytic performance for H2 generation and Cr(VI) reduction. The optimal 5% Cd(OH)2/CdS obtained an impressive H2 production rate of 3475 μmol·g-1·h-1 under visible light, marking a 6.3 times increase compared to CdS. Additionally, the kinetics of Cr(VI) reduction were markedly accelerated, with a rate constant of 0.2803 min-1, representing a 5.7 times improvement over pure CdS. Moreover, the 2D/2D Cd(OH)2/CdS photocatalyst exhibited exceptional stability, maintaining high photocatalytic activity over multiple reaction cycles. Experimental findings and DFT calculations revealed the charge transfer mechanism between CdS nanosheets and Cd(OH)2 cocatalyst. This work provides insights into designing high-performance CdS-based nanophotocatalysts for water splitting and environmental remediation.
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Jing Meng,Moustafa Zahran,Ahmed S. Abou-Elyazed,Xiaolin Li
Herein, we report a novel electrochemical sensor for determining glucose in sweat, employing a graphene/metal–organic framework (MOF) as a modifier for stainless steel (SS) electrode. The MOF structures, MIL-101(Cr), MIL-101(Cr)-NO 2 , and MIL-101(Cr)-NH 2 , were hydrothermally synthesized and then characterized using X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, N 2 adsorption/desorption isotherms, and scanning electron microscopy (SEM). XRD and SEM results proved the formation of the crystalline MIL-101(Cr) and MIL-101(Cr)-NO 2 , and the amorphous MIL-101(Cr)-NH 2 . Additionally, FT-IR and isotherms confirmed their composition and mesoporosity, respectively. The amorphous MIL-101(Cr)-NH 2 showed the best electrocatalytic activity towards glucose oxidation among the fabricated MOFs. The electrocatalytic activity was also boosted after incorporating conductive graphene. Under optimized conditions, graphene/MIL-101(Cr)-NH 2 /SS was used for glucose determination using square wave voltammetry and chronoamperometry with detection limits of 0.004 and 0.01 mM, respectively. Moreover, the modified electrode showed acceptable recovery values when it was applied to detect glucose in artificial sweat samples.
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Sun Qian,Wang Changlong,Zhang Lixin,Yang Yanzhao
The high pathogenicity to organisms and high destructiveness in the natural environment determine the utmost importance of removing Cr(VI) from water. Herein, thiourea crosslinked-amino modified graphene nanoflakes (TAGN) was prepared by simple ring opening reaction and silanization reaction and the Cr(VI) adsorption performance was investigated. Results manifested that TAGN presented three-dimensional porous structure with abundant folds and avoided agglomeration. The adsorption experiments indicated that the optimal test pH value was 2 and the most suitable adsorbent dosage was 1 g/L. Under the optimum adsorption conditions, TAGN exhibited an outstanding adsorption capacity of 193.77 mg/g for Cr(VI) in water. Various characterizations and tests such as Zeta potential , FTIR, XPS as well as isotherms and kinetics revealed that the adsorption of TAGN for Cr(VI) was more consistent with Freundlich isotherm model and pseudo-second-order kinetic model , confirming a multilayer chemisorption process dominated by multiple combination mechanisms: electrostatic interaction, reduction reaction, complexation and hydrogen bonding interaction. Under the condition of coexistence of multiple metal ions , the TAGN could still maintain superb selectivity of 63.9% towards Cr(VI). After ten cycling test, 81.8% removal efficiency of Cr(VI) was guaranteed. Therefore, TAGN possessed high adsorption capacity , excellent selectivity and prominent cyclic regeneration ability. This work provided a promising nanosorbent for the field of water cleaning, especially for the elimination of heavy metal ions .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Lanlan Li,Zhiyang Wei,Xiaowei Liu,Yunhe Yang,Chenxun Deng,Zhimin Yu,Zhi Guo,Jianghong Shi,Chengzhu Zhu,Wei Guo,Zhenjie Sun
Chitosan (CS) is an attractive bio-adsorbent in pollutant removal due to its environment-friendly properties and abundant adsorption sites. However, the weak mechanical properties and strong dissolubility in acidic conditions of CS hinder its wide application. Herein, a facile method was proposed to fabricate polydopamine (PDA) and CS cross-linked graphene oxide (GO) (GO/CS/PDA) composite aerogel for Cr (VI) removal. GO was cross-linked with CS, forming a reinforced and three-dimensional macroporous structure; the introduced PDA was simultaneously cross-linked with CS and GO, providing more abundant nanopores and active sites for Cr(VI) removal. Based on the batch experiment results, GO/CS/PDA exhibited an optimized mass ratio (1:20:2) of GO, CS, and PDA for the most effective Cr(VI) adsorption; the adsorption removal rate of Cr(VI) was pH dependent, with the highest removal rate at pH = 3.0. The pseudo-second-order kinetic and Freundlich models were more suitable for fitting the adsorption kinetics and adsorption isotherms, respectively, and the maximum adsorption capacity for GO/CS/PDA was 312.05 mg/g at 298 K. Thermodynamics parameters indicated that the adsorption was a spontaneous and exothermic process. The excellent mechanical integrity and reusable adsorption performance of GO/CS/PDA promise the adsorbent with satisfactory reusability.
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MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Xiao Jiang,Qing-Da An,Zuo-Yi Xiao,Shang-Ru Zhai,Zhan Shi
A cost-effective and chemically modified biological adsorbent based on agricultural wasted husks for heavy metal removal was fabricated by coating with Polydopamine–Polyethylenimine via the mussel inspired chemistry. Batch and fixed bed column adsorption experiments were carried out to explore the sorption capacity and potency of industrial application. The batch results indicated that the maximum adsorption capacity reached 42.8 mg/g which is much larger than most adsorbents based on bioresource and agricultural wastes for Cr(VI) removal in aqueous solution simultaneously with excellent recycling performance. In column adsorption experiments, it exhibited high mechanical stability and applied potential. The equilibrium time was 9130 min under the flow rate of 1 ml/min, and reached the equilibrium adsorption capacity of 47.14 mg/g. The breakthrough curves ploted by the data of fixed bed experiments under different flow rates (1 ml/min & 2 ml/min) fitted the Thomas model with R 2 of 0.9510 and 0.9437 respectively.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xiaoyu Lin,Xi He,Ling Lei,Yufeng Zhao,Longzhe Cui,Guiping Wu
Cr(VI)-contaminated water poses a serious threat to the environment. In this study, capsule-type biosorbent Aliquat-336-filled chitosan capsules (AFCCs) were prepared by a simple and gentle method for more efficient and eco-friendly removal of Cr(VI). The experimental results show that the uptake of Cr(VI) by AFCCs increased with increasing Aliquat-336 content. The AFCCs show excellent stability under acidic conditions, and the maximum adsorption capacity was reached at a pH of 2. The maximum adsorption capacity of AFCCs for Cr(VI) was 110.94 ± 5.07 mg/g at 20 °C, which was calculated based on the Langmuir model. The kinetic results show that the adsorption rate control process changed from liquid film diffusion to a chemical reaction with increasing shaking rate. In addition, the AFCCs and adsorption-reduction mechanism of Cr(VI) were characterized by digital photography, electron microscope , zeta potential , Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results indicated that the electrostatic attraction between quaternary amine groups in Aliquat-336 and Cr(VI) anions plays a major role in the removal of Cr(VI). Subsequently, the adsorbed Cr(VI) obtained electrons from C C/C H and NH 3 + / NH 2 + were reduced to Cr(III), while C C/C H and NH 3 + / NH 2 + were oxidized to C O, C O, =NH + , =N and N O, respectively.
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