Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·123147
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IF 7.5
Jiaxin Gao,Xu Xu
This study demonstrates a facile one-step carbonization route for converting loofah sponge into magnetic porous nitrogen-doped biochar (FeN@BC-KOH) for the removal of Pb 2+ , Cd 2+ , and Cu 2+ from aqueous solutions. The proposed method integrates KOH activation, nitrogen doping and Fe-based magnetization in a single step, thereby simplifying the preparation procedure relative to conventional multi-step modification strategies. Systematic characterizations confirm the formation of mesoporous structure with high specific surface area, along with abundant oxygen/nitrogen functional groups and Fe-N x active sites. The synergistic contribution of porous structure, nitrogen-containing moieties and magnetic confers the biochar with enhanced adsorption capacity and facile magnetic separation performance. Adsorption conditions were optimized using Box-Behnken Design (BBD). Kinetic investigations demonstrated that the adsorption process adhered to a pseudo-second-order model (R²>0.9688). Meanwhile, the isotherm data were most appropriately characterized by the Freundlich model (R²>0.8723), implying that multilayer adsorption governed by chemisorption was predominant. The principal adsorption mechanisms encompassed complexation, precipitation, ion exchange. FeN@BC-KOH demonstrated excellent reusability (8 cycles). This work provides a green, scalable, and high-efficiency strategy for valorizing agricultural waste loofah sponge into high-performance adsorbents, which exhibits good application potential in the remediation of actual heavy metal-contaminated water.
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LANGMUIR
·
2026
·
IF 4.4
Zhenyu Hu,Xiaoqing Jin,Shibin Han,Xiaoyuan Liang,Biao Tang,Yuhan Cui,Tai Peng
Aqueous zinc-ion hybrid supercapacitors have garnered widespread attention as safe and cost-effective energy storage devices, yet their performance is frequently constrained by cathode materials. In this work, Cu2+-doped V2O5 cathodes with diverse morphologies were fabricated via a facile microstructural engineering strategy to enhance Zn2+ storage capability. Using the optimized V2O5 as the cathode and capacitive activated carbon as the anode, a novel zinc-ion hybrid supercapacitor was assembled. Under the optimal mass ratio of the electrodes, the hybrid supercapacitor delivers a maximum specific capacity of 70.3 mAh g–1 and an energy density of 36.7 Wh kg–1. Furthermore, the precipitation and dissolution of Zn4(OH)6SO4·5H2O are identified as a critical contributor to the capacity. This study provides a feasible approach for the design of high-performance aqueous zinc-ion hybrid supercapacitors.
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Digest Journal of Nanomaterials and Biostructures
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2026
·Vol. 21
·期 1
·
IF 1.2
Miliang Zhang
Membrane fouling, especially the composite pollution caused by inorganic scaling and biological fouling, is a key challenge in the treatment of underground karst water with high salinity and high hardness. This study reports a polyethersulfone (PES) ultrafiltration (UF) membrane modified by molybdenum disulfide-tannic acid@copper ions (MoS2-TA@Cu2+) bionanomaterial. By blending MoS2-TA@Cu2+ nanoparticles into the PES matrix, the membrane's structure and comprehensive properties were systematically controlled. Scanning electron microscopy (SEM) and static water contact angle measurements were employed to characterize the morphology and surface properties of the membranes. Characterization analysis confirmed that the hydrophilicity of the modified membrane was enhanced (the water contact angle [WCA] was reduced from 69° to 56°), and it showed high antibacterial properties (the antibacterial rate against Escherichia coli [E. coli] reached 95%). The core contribution of this study is to systematically elucidate the tunable trade-off mechanism between key membrane properties dominated by nanoparticle loading. Specifically, a loading capacity of 10 g/m2 achieved optimal anti-fouling stability, with a flux recovery rate (FRR) as high as 81.5% (40.5% higher than that of the original membrane). In contrast, a loading capacity of 15 g/m2 showed the superior permeation and separation performance, with a turbidity removal rate of 92.9% in actual karst water and a silt density index (SDI) reduction value of 5.3, fully meeting the stringent requirements of reverse osmosis pretreatment. Both static and dynamic anti-fouling experiments confirmed its excellent performance, with the CaCO3 scaling amount reduced by up to 65.2%. This study provides an effective strategy for the development of multifunctional UF membranes that can cope with complex water quality challenges by revealing the inherent trade-off between separation efficiency and anti-fouling stability. This paper provides the key theoretical basis and practical guidance for the precise design of high-performance multifunctional membranes.
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Journal of Physical Chemistry C
·
2017
·
IF 4.536
Dongxu Zhu,Aiwei Tang,Qinghua Kong,Bin Zeng,Chunhe Yang,Feng Teng
Ternary alloyed Cu2–xSySe1–y nanocrystals (NCs) were synthesized by using a simple and phosphine-free colloidal approach, in which sulfur powder and 1-dodecanethiol (DDT) were used as sulfur sources. In both cases, the crystal phase transformed from cubic berzelianite to monoclinic djurleite structure together with the morphology evolution from quasi-triangular to spherical or discal with an increase of sulfur content. Accordingly, the near-infrared (NIR) localized surface plasmon resonance (LSPR) absorption of the as-obtained sulfur-rich NCs exhibited obvious red-shift of wavelength and widening of absorption width. When the sulfur powder was chosen as sulfur sources, the LSPR wavelength of the as-obtained alloyed Cu2–xSySe1–y NCs could be tuned from 975 to 1230 nm with a decrease of selenium content in the NCs. In contrast, the region of the red-shift could be up to 1250 nm for the alloyed NCs synthesized by incorporation of different DDT dosage into the reaction system. The different sulfur sources and the electron donating effects of the DDT as a ligand played an important role in the LSPR absorption tuning. This deduction could be testified by the post-treating the quasi-triangular Cu2–xSe NCs with DDT under different temperatures and over different reaction time, which exhibited a red-shift of LSPR wavelength up to 450 nm due to coordination of DDT to Cu atoms on the NC surface while incorporating some sulfur anions into the lattice. This study offers a convenient tool for tuning the LSPR absorption of copper chalcogenide NCs and makes them for application in biological and optoelectronic fields.
研究领域:
纳米材料
·
等离激元学
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胶体化学
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光电子学
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材料科学
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Energy Storage Materials
·
2022
·
IF 20.831
Chang Liu,Cheng Yang,Yu Liu
Sulfur with high specific capacity is a promising candidate for electrode material of aqueous/nonaqueous metal-sulfide batteries , however, it suffers from poor cycle stability due to its poor conductivity, large volume change and shuttle effect of polysulfide . For the first time, this work employs a semiconductor Ag 2 S with good electronic conductivity as cathode of aqueous metal-sulfide batteries, which gives a four-electron electrode reaction through a three-step all-solid-state conversion reaction of Ag 2 S→Ag 3 CuS 2 →AgCuS→Cu 2 S with a specific capacity of 432 mAh g −1 . Besides, low volume expansion and the elimination of shuttle effect due to the small K sp of Ag 2 S contribute to satisfactory cycle performance. The as-proposed Cu-Ag 2 S battery shows an extremely low overpotential of 50 mV and excellent cycle performance of 9000 cycles, which are the lowest and highest values respectively among all the reported metal-sulfide batteries. By pairing with Zn of lower potential, a cascade Zn-Ag 2 S battery is designed and achieves high working voltage up to1.22 V successfully. After Ag 2 S fully reducing into Cu 2 S in discharge process, Cu 2+ in the electrolyte can provide additional capacity for the battery, thus, the cascade battery design can achieve a higher energy density , representing a promising route to energy-dense aqueous batteries.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Zhaofa Li,Quanxiu Zhou,Palanivel Sathishkumar,Liang Peng,Qunfang Wang,Feng Long Gu
The present work fabricated a novel dual-emission responsive ratiometric fluorescent hybrid nanoprobe using a mixture of blue fluorescence-emitting N-Doped Carbon Quantum Dots (N-CQDs) and red fluorescence-emitting l -cysteine-capped CdSe/ZnS Quantum Dots (Lcys-CdSe/ZnS QDs). The addition of Cu 2+ resulted in the strong and specific fluorescence quenching in Lcys-CdSe/ZnS QDs while N-CQDs retained their fluorescence intensity. Further exploration of the nanoprobe showed that the detection limit was 3.78 × 10 −9 M and the linear range was below 3.2 × 10 −6 M. The nanoprobe possessed excellent anti-interference in the Cu 2+ determination and its application was successful in natural water samples. Experimental results suggested that the superficial left cysteine (Lcys) combines with Cu 2+ causing static quenching. Results of density functional theory (DFT) computation explained that Cu 2+ has the greatest possibility to combine with surficial Lcys and furthermore illustrated the role of the combination in static quenching. The work showed one of origin of the selectivity of the nanoprobe and a potentially guidance to design high selective ratiometric fluorescent nanoprobes.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Junli Shi,Mingya Wang,Xinqiang Pang,Yongzheng Liu,Wendong Liu,Yuanyuan Huo,Fanfan Shen,Shengling Li,Linxiu Zhao,Duanlin Cao
In this work, a highly sensitive fluorescent probe methyl (E)-2-((7-(diethylamino)-2-oxo-2 H -chromen-3-yl)methylene)hydrazine-1-carboxylate ( SJL ) was synthesized from 7-(diethylamino)-2-oxo-2 H -chromene-3-carbaldehyde and methyl hydrazinecarboxylate and characterized by various spectroscopic techniques. Highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies of SJL and SJL -Cu 2+ complexes were estimated by DFT calculations, thus elucidating the conformation of the complexes. The probe SJL formed a stable complex and displayed a remarkable fluorescence quenching response to Cu 2+ with a quenching efficiency of approximately 82.3% in aqueous solution. The binding stoichiometry of SJL -Cu 2+ was determined to be 1: 1 based on the Job's plot method, and it exhibited a good linear relationship at ultra-low concentrations with a detection limit of 0.6 μM. The optimum pH range for SJL was 5–9. SJL could be made into test strips for the characterization of Cu 2+ . In particular, the probe has been used to visualize copper ions in Hela cells and glassfish larvae.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Xun Zhou,Juerui Zhang,Dongyan Huang,Yinhui Yi,Kechen Wu,Gangbing Zhu
In this work, a ratiometric fluorescence sensing platform was established to detect Cu 2+ and D-PA ( d -penicillamine) based on nitrogen-doped Ti 3 C 2 MXene quantum dots ( N -MODs) that was prepared via a simple hydrothermal method and exhibited strong fluorescent and photoluminescence performance as well as excellent stability. Since the oxidation reaction between o -phenylenediamine (OPD) and Cu 2+ induced the formation of 2,3-diaminophenazine (ox-OPD) which not only can emerge an emission peak at 570 nm, but also inhibit the fluorescence intensity of N -MQDs at 450 nm, a ratiometric reverse fluorescence sensor via fluorescence resonance energy transfer (FRET) was designed to sensitively detect Cu 2+ , where N -MQDs acted as energy donor and ox-OPD as energy acceptor. More importantly, another considerably interesting phenomenon was that their catalytic oxidation reaction can be restrained in the presence of D-PA because of the coordination of Cu 2+ with D-PA, further triggering the obvious changes in ratio fluorescent signal and color, thus a ratiometric fluorescent sensor of determining D-PA was proposed also in this work. After optimizing various conditions, the ratiometric sensing platform showed rather low detection limits for Cu 2+ (3.0 nM) and D-PA (0.115 μM), coupled with excellent sensitivity and stability.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Wei Zhou,Xin Wang,Youping Liu,Weikang Zhang,Xin Di
A novel type of Cu 2+ -based immobilized metal affinity magnetic nanoparticles (MHNTs@PDA@Cu 2+ ) was designed and synthesized by a facile and green strategy, and served as an adsorbent for magnetic solid-phase extraction (MSPE) of trace Sudan dyes in foodstuffs. Owing to π-π stacking, hydrogen bonding, hydrophobic and Cu 2+ -azo coordination, MHNTs@PDA@Cu 2+ possesses superior affinity and very fast adsorption capability to Sudan dyes (adsorption time of 1 min). The main parameters influencing the extraction efficiency of MSPE were investigated and optimized. By coupling MHNTs@PDA@Cu 2+ -based MSPE with HPLC-UV, a simple, fast and sensitive method for the determination of trace Sudan dyes in food samples were developed. Good linearity (R 2 ≥ 0.9937) and low limits of detection (0.06–0.10 μg L −1 ) were obtained. The method was successfully applied to determine Sudan dyes in juice, soy sauce and red wine, and the recoveries for the spiked samples ranged from 78.1% to 112.4% with RSD less than 9.0%.
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Crystals
·
2022
·Vol. 12
·期 6
·841
·
IF 2.67
Sai Zhang,Zhe Yao,Wenqiang Qiao,Zhi Yuan Wang
A rhodamine-based fluorescent polymer P(MMA-co-RB) has been synthesized via an intermediate NCO-containing polymer generated by the Lossen rearrangement reaction. The fluorescent property of P(MMA-co-RB) with regard to metal ions, such as Cu2+, Fe3+, Cr3+, Al3+, Zn2+, Co2+, Sn2+and Ag+, was studied by fluorescence emission spectroscopy. The results demonstrate that the fluorescence intensity of P(MMA-co-RB) decreased gradually with an increase of the concentration of Cu2+ion. Furthermore, a test strip made of P(MMA-co-RB) can be used for fast and quantitative determination of Cu2+ion. In the presence of Cu2+ion, the sensory tester undergoes distinct changes in fluorescence intensity and visible color.Keywords:Lossen rearrangement;rhodamine B;fluorescent polymer;detection of copper ion
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ACS Omega
·
2021
·
IF 3.512
Abdelazeem S. Eltaweil,Injy M. Mamdouh,Eman M. Abd El-Monaem,Gehan M. El-Subruiti
Herein, we report a new metal–organic framework (MOF)-based composite beads adsorbent made via incorporating UiO-66 MOF, carboxylated graphene oxide (GOCOOH) into sodium alginate for efficient removal of methylene blue dye, and Cu2+ ions. The successful fabrication of the synthesized UiO-66/GOCOOH@SA composite beads was confirmed by means of X-ray diffraction, Fourier transform infrared, scanning electron microscopy, zeta potential, X-ray photoelectron spectroscopy analysis, and thermogravimetric analysis and BET measurement. The incorporation of both UiO-66 and GOCOOH into SA beads greatly increased their adsorption efficiency for the removal of both MB and Cu2+ with maximum adsorption capacities of 490.72 and 343.49 mg/g, respectively. The removal process of both MB and Cu2+ follows the pseudo-second-order model and Freundlich isotherm model. A plausible adsorption mechanism was discussed in detail. Regeneration tests clarified that the removal efficiencies toward both MB and Cu2+ remained higher than 87% after five cycles. These results reveal the potentiality of UiO-66/GOCOOH@SA beads as an excellent adsorbent.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jianhua Sha,Lulu Li,Zexiu An,Maoxia He,Haiyan Yu,Yao Wang,Baoyu Gao,Shiping Xu
Coexistence of heavy metals usually shows great impact on antibiotics removal. In this study, we firstly reported that Cu 2+ shows diametrically opposite effect on adsorption-photodegradation of sulfamerazine (SMZ) and ciprofloxacin (CIP) in g-C 3 N 4 /visible light system. Cu 2+ can greatly promote CIP adsorption, but showed negligible impact on its degradation, whereas, no obvious influence on SMZ adsorption was recorded, but strong inhibition to its photodegradation was observed. With help of several spectroscopy approaches and DFT calculation, functional mechanism of Cu 2+ on the adsorption-photodegradation of SMZ and CIP was proposed. The main reasons for their different behaviors were found to be their distinct surface charge, spatial structure, electron distribution and complexation with Cu 2+ . Among them, effect of complexation played the most important role in depressing the reactivity of antibiotics during photodegradation . Aiming at retarding this inhibition, an effective approach with idea of complexation replacement was proposed. This study indicated that interactions between antibiotics and heavy metals are very specific, and an appropriate treatment scheme should be given based on systematic study targeting at the specific pollution system.
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