JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Liping Deng,Liangmei Rao,Xinyu Lu,Yutang Wang,Weiming Zhang,Xuemin Duan,Yangping Wen,Zhuohua Kong,Jingkun Xu
The accumulation of heavy metal cadmium (Cd) in the food chain poses a serious threat to human health, necessitating the development of rapid, on-site, and portable detection methods for Cd (II). Herein, we developed a smartphone-based electrochemical sensor for portable determination of Cd (II) in vegetables using a bismuth metal–organic framework (Bi-MOF) nanocomposite. Prismatic rod-like Bi-MOF was hydrothermally synthesized using trimesic acid as organic ligands, and subsequently, carboxyl-functionalized multi-walled carbon nanotubes (COOH-MWCNTs) were incorporated to form Bi-MOF nanocomposite network. The smartphone-based electrochemical sensor enables rapid, sensitive, and portable detection of Cd (II) in vegetable samples using Bi-MOF/COOH-MWCNTs-modified screen-printed carbon electrodes (SPCE). A comparative analysis of traditional electrochemical sensors coupled with desktop computer for linear voltametric responses for Cd (II) in the range of 0.2–500 ng/mL with a limit of detection (LOD) of 0.07 ng/mL using Bi-MOF/COOH-MWCNTs-modified glassy carbon electrodes (GCE), the portable sensor demonstrated good linear range in 0.7–350 ng/mL with a LOD of 0.22 ng/mL. This work introduces a novel approach for on-site and portable detection of Cd (II) in agricultural products.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Jiahai Yu,Xiong Yang,Lei Xiao,Shizhu Song,Jiayue Chen,Liwen Cao,Min Xia,Pan Wu,Kewu Pi,Guohong Qiu
Lignin derived from papermaking black liquor is an abundant and economical biochar precursor, however, its direct pyrolysis products often exhibit limited adsorption capacity for heavy metal ions due to their inherent poor pore structure. In order to improve the adsorption ability of lignin-based biochar, an electrochemical adsorption strategy was used to significantly enhance its removal performance for heavy metal in this study. Using alkali lignin and sodium lignosulfonate as precursors, biochar electrodes were prepared via direct pyrolysis. Their physical and chemical properties were comprehensively compared, and their selective electrochemical adsorption efficiency for Cd 2+ in high-salt wastewater was systematically evaluated. The effect of the applied voltage was investigated, and 1.2 V was determined as the optimal operating voltage within the tested range. Under this condition, alkali lignin biochar (AL-BC) exhibited a maximum electrochemical adsorption capacity of 409.3 mg g −1 , significantly exceeding the 82.8 mg g −1 observed for sodium lignosulfonate biochar (LS-BC). The electrochemical process increased the adsorption capacity of AL-BC and LS-BC by about 6.95 and 3.53 times, respectively. Quantitative analysis of electrochemical adsorption mechanisms revealed that the selective capture of Cd 2+ on AL-BC was primarily governed by chemical adsorption mechanisms. Surface precipitation was the dominant contributor (67.1 %), followed by ion exchange (26.2 %), whereas EDLs adsorption (4.8 %) and surface complexation (2.0 %) played minor roles. This study revealed the potential of lignin biochar as a highly efficient and selective electrochemical adsorbent for heavy metal ions in wastewater, providing a new strategy for the high-value utilization of lignin.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Lei Yang,Xuanxuan Yuan,Dian Dai,Shuqiang Wang,Ying Wu,Haihua Wang,Zhongguo Shan
The growing concern over food safety and environmental pollution has stimulated the development of multifunctional biodegradable films. Herein, β-Cyclodextrin metal-organic frameworks (β-CD-MOFs) were prepared as loading carriers for chlorogenic acid (CGA) and silver nanoparticles (Ag NPs). These materials (CGA-Ag@CD-MOFs) were then added into a zein matrix to construct bioactive packaging films (MOFs-Zein). SEM showed that appropriate content of CGA-Ag@CD-MOFs (2 wt%) promoted the formation of a more uniform and denser film structure. FT-IR verified that hydrogen bonding between CGA-Ag@CD-MOFs and zein matrix endowed MOFs-Zein-2 % with superior tensile strength (24.61 ± 2.58 MPa), elongation at break (5.01 ± 0.71 %), barrier properties of water vapor (1.84 × 10 −7 g·m −1 ·h −1 ·Pa −1 ) and oxygen (0.63 × 10 −10 g·cm/cm 2 ·s). Moreover, it can control the release of both CGA and Ag + , which displayed high-efficiency antioxidant and antimicrobial activities against Escherichia coli O157:H7 and Staphylococcus aureus . Comprehensive biosafety evaluation through cytotoxicity (Caco-2 viability >98 %), hemolysis (< 5 %), and acute toxicity studies confirmed material safety. When applied for grape storage, MOFs-Zein-2 % effectively preserved nutritional quality and texture, and prolonged the shelf-life of grapes by 16 days. Importantly, complete biodegradation occurred within 40 days. This study provides a simple strategy for constructing of high performance of biodegradable packing films.
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ENVIRONMENTAL RESEARCH
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2025
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IF 7.7
Ruize Jia,Ronghao Man,Liannan Shang
The rapid development of mineral resources exploitation and industries has brought a large amount of wastewater containing cadmium (Cd) and arsenic (As) to the environment. Among these, the mining industry has become a major challenge in wastewater treatment due to the coexistence of both pollutants at high concentrations. Developing a sustainable and low-cost adsorbent capable of simultaneously adsorbing both anionic and cationic pollutants is a key breakthrough direction for solving this practical problem. In this study, chitosan-grafted Fe-pillared bentonite (CS@Fe@Bt) was synthesized using natural bentonite, aiming to provide an efficient material for treating Cd and As co-contaminated wastewater (especially mining industry wastewater). Results suggested that the specific surface area (SSA) and total pore volume of Fe-pillared bentonite increased by 1.85 and 1.32 times, respectively, compared with the raw bentonite. Pillaring the bentonite also significantly enhanced its chitosan loading capacity, improving both the structural stability and adsorption performance of CS@Fe@Bt. Kinetic and isothermal adsorption experiments revealed that CS@Fe@Bt possessed a multilayer heterogeneous surface, with Cd and As adsorption following the Pseudo-second-order kinetic model. CS@Fe@Bt showed strong adsorption capacity for both Cd(II) and As(III) when the initial pH i of the solution ranged from 6 to 8. The maximum adsorption capacities ( Q m ) for Cd(II) and As(III) were 80.79 mg·g -1 and 34.90 mg·g -1 , respectively, surpassing most comparable adsorbents. The primary adsorption mechanisms of CS@Fe@Bt in Cd(II) and As(III) co-polluted water included oxidation (57.81% of As(III) was converted to low-toxicity As(V)), electrostatic interactions, and the formation of B-type ternary surface complexes (CS@Fe@Bt-As-Cd). Additional mechanisms included ion exchange, pore adsorption. These findings highlight the potential of CS@Fe@Bt as an effective adsorbent for Cd(II) and As(III) adsorption, providing technical support for addressing practical wastewater treatment challenges.
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Cancan Yang,Chongyue Bai,Xiaoting Chen,Hamdy Khamees Thabet,Saad Alshammari,Yunlong Sun,Jiongru Li,Juanna Ren,Hassan Algadi,Xiangzheng Hu,Faming Gao,Dapeng Cui,Zhanhu Guo,Huige Wei
The increasing utilization of hyodeoxycholic acid (HDCA) additives in animal feed has created a pressing need for reliable detection methods. This study presents a novel non-enzymatic electrochemical platform for specific detection of HDCA using liquid nanocomposites from potassium-coordinated cyclodextrin metal-organic frameworks (K-CD-MOFs) immobilized on reduced graphene oxide (rGO) substrates. Employing neutral red (NR) as the probe, rGO-K-CD-MOFs@NR exhibits outstanding sensing performance with a wide linear detection range (5.0–100.0 μM), a high sensitivity (0.10 μA·μM −1 ), and low detection limit (1.97 μM, S/N = 3). The sensor also demonstrates exceptional selectivity for HDCA and maintains stable performance for six months under low-temperature storage conditions. The excellent performance originates from the synergistic effect between rGO's excellent electron transfer capability and K-CD-MOFs' unique host-guest recognition properties. This work not only provides an effective solution for HDCA monitoring in feed products but also offers a promising strategy for developing advanced electrochemical sensors for food safety and quality control applications in the animal husbandry industry.
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Journal of Materials Chemistry C
·
2025
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IF 5.1
Haoqi Li,Wenjun Yuan,Kun Zhang,Yifei Wang,Xinrui Chen,Yuqin Su,Xingle Shang,Hengyang Xiang,Haibo Zeng
The carrier injection limitation caused by the surface ligands of quantum dots (QDs) is a major challenge for achieving high-brightness emission in quantum dot light-emitting diodes (QLEDs). In this work, we enhanced the polarity of the antisolvent by incorporating inorganic bromides (ZnBr2) to improve ligand stripping capability, thereby achieving fewer insulating ligands to meet the demand for efficient carrier injection. Simultaneously, the inorganic bromide provided a Br-rich environment, suppressing the generation of Br vacancies under polar conditions, which frequently happened in traditional antisolvent strategies. Benefiting from this polarization-passivation synergistic strategy, ZnBr2-treated QDs exhibited a 17% reduction in ligand quantity and a 40% reduction in defect density, thus the photoluminescence quantum yield (PLQY) of ZnBr2-treated QDs increased from 47% to 86%. The fabricated QLEDs exhibited a 143% increase in current density and a maximum brightness reaching 104,126 cd/m2, which was 4.96 times that of samples treated with pure antisolvent. Correspondingly, the operational lifetime (T50@100 cd/m2) of the device extended from 20 h to 241 h. This simple inorganic bromide polarization-passivation synergistic strategy in QDs' purification engineering provides a new approach for realizing high-brightness QLEDs.
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Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Xiaodan Tang,Yukun Luan,Yuyan Zhao,Bing Li,Mengchun Wu,Yawen Lai
Heavy metal pollution is a huge hazard to the water environment and modified clay adsorbents have been widely used to remove heavy metals from water. Degradable anionic chelating agents have a greater potential for the immobilization of heavy metals, so tetrasodium iminodisuccinate (IDS) was introduced to modify montmorillonite (Mt) for Pb(II) and Cd(II) adsorption from water in this study. IDS was bound with Mt by sonication, heating, and acidity to form IDS-Mt, and characterized by XRD, FT-IR, SEM, and zeta potential analyzer. The batch adsorption experiments revealed that IDS-Mt5 had excellent adsorption capacity of Pb(II) and Cd(II) up to 214.73 mg/L and 104.07 mg/L, respectively. The adsorption process of IDS-Mt on Pb(II) and Cd(II) was consistent with the Sips model and PSO model, indicating that the adsorption was heterogeneous and chemical. The adsorption capacities of IDS-Mt in the second cycle remained above 76 % for Pb(II) and 69 % for Cd(II) of the initial ones, respectively. IDS was immobilized on the interlayer and edge surfaces of Mt through interactions or forming hydrogen bonds facilitated by ultrasonic under acidic heating conditions. Pb(II) and Cd(II) were immobilized by IDS-Mt through cation exchange, negative charge attraction at the edge surface, and IDS chelation. IDS-Mt was an excellent adsorbent with strong dispersibility and swelling properties for Pb(II) and Cd(II) removal from contaminated water. This study provides a new solution for the anionic modification of Mt and a new material for the treatment of heavy metal wastewater.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2025
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IF 2.8
Lifan Cai,Jingjing Yang,Tuo Zhao,Jijun Huang,Zequn Li,Hao Zhang,Yiwen Yao,Wanxin Zhu,Xinming Wu,Le Shao
With the advancement of the global dual-carbon goal, green technology has become a priority in the energy field. Among energy storage technologies, all-solid-state batteries attract significant attention due to their high energy density, enhanced safety, and long cycle life. Poly(ethylene oxide) (PEO)-based polymer solid-state electrolytes are a research hotspot for next-generation lithium-metal batteries because of their flexibility, film-forming capabilities, and compatibility with lithium salts. In this study, cyclodextrin (β-CD) is employed as a green filler and combined with high-modulus polyacrylonitrile (PAN) fibers and plastic crystalline succinonitrile (SN) to synergistically enhance the electrochemical and mechanical properties of PEO-based electrolytes. The PAN/PEO/LiClO 4 /β-CD/SN electrolyte achieves an ionic conductivity of 6.5 × 10 −5 S cm −1 at 30°C and a lithium ion transference number of 0.33 at 80°C. PAN fiber significantly improves mechanical properties, achieving a tensile strength exceeding eight times that of the PEO/LiClO 4 membrane. In Li/Li symmetric batteries, the electrolyte demonstrates excellent interfacial stability for over 1100 h at 0.1 mA cm −2 . Additionally, the LiFePO 4 |PAN/PEO/LiClO 4 /β-CD/SN|Li coin cell exhibits an initial discharge specific capacity of 148 mAh g −1 at 80°C and 0.5C, retaining 70% capacity after 200 cycles. This study presents a novel design approach for utilizing green fillers in SPEs.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Xuan Wang,Xu Meng,Tao Liang,Jiachun Song,Kamal Eldin Afaf,Hong Duan,Lingyan Zheng,Gang Chen
γ-Cyclodextrin (γ-CD) is one of the most widely used materials for encapsulating hydrophobic functional molecules due to its distinctive structural features, especially an internal hydrophobic cavity surrounded by external hydrophilic surface. However, its limited loading capacity, adsorption efficiency, and poor stability hinder its broader applications. To address this issue, γ-cyclodextrin-based metal-organic frameworks (γ-CD-MOFs) was formed by anchoring potassium ions with γ-CD through hydrothermal self-assembly. After loading different hydrophobic small molecule active substances, a multifunctional composite coating was prepared by embedding them into the chitosan (CS) matrix. The release kinetic model analysis confirmed that the release behavior of Cinnamaldehyde (Cia), 2-methoxycinamaldehyde (2-MCA), and Curcumin (Cur) from γ-CD-MOFs conformed to the Ritger-Peppas equation. Compared with CS, CS/γ-CD-MOF@Cia has a strong inhibitory effect on E. coli O157: H7 and S. aureus . Sprayed on green grapes, the shelf life is extended to 21 days. CS/γ-CD-MOF@2-MCA can significantly reduce the spoilage of milk caused by photooxidation. Furthermore, compared with CS, the oxidation and browning of banana peels were effectively delayed by CS/γ-CD-MOF@Cur, and complete blackening is not observed even after 11 days of storage. By combining the advantages of chitosan and γ-CD-MOF, the active molecules with different functions were encapsulated on the platform of γ-CD-MOF to achieve antibacterial, light-blocking, and antioxidant effects on food. The novel functional coating materials presented in this work offer a promising approach to effectively prolonging the shelf life of fresh foods products.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Zi-Nan Chen,Shao-Yi Chen,Yonghong Xiao,Hao-Long Zhou,Xiao-Chun Huang
Carbon nanodot (CD)/metal–organic framework (MOF) nanocomposites are expected to be promising white light LED materials due to their tunable compositions. Nevertheless, the material instability, cost, toxicity, and other restrictions must be settled for their practical application. Herein, we report a facile self-carbonization strategy for preparing low-cost CD/MAF (carbon nanodot embedded in metal–azolate framework) nanocomposites with retained structure and stability. The resulting CD/MAF showed topology-dependent, near-white light emission behaviors suitable for white light emission. This nanoscale strategy sheds light on the path toward low-cost, highly tunable luminescent nanocomposite materials.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 1
·628-632
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IF 1.556
Hu Xin,Miao Yuqing,Zhou Shilin,Liang Xiaocai
Here we report a Bi/mesoporous carbon modified glass carbon electrode (Bi-MC-GCE) for the detection of heavy metal ions Zn, Cd and Pb. Bi(NO3)3 was firstly entrapped into the holes of MCs by sonicating them together in solution. Then the dispersed mixture was pipetted
onto the surface of GCE and left to dry. Bi(NO3)3 in the holes of MCs was reduced to metallic Bi during the process of deposition for square wave stripping analysis. The obtained Bi-MC-GCE exhibits significantly enhanced sensitivity for Zn, Cd and Pb detection compared
to blank GCE, bismuth or MC alone modified GCE, which is attributed to the high specific surface area of MCs and the increased amount of entrapped bismuth as active sites for the deposition and stripping of heavy metal ions. A linearship is observed for the concentration of Zn, Cd, and Pb
from 10 to 110 ppb. The relative standard deviation was 3.7% for Zn, 3% for Cd and 8% for Pb at the 90 ppb level (n = 3). The suggested Bi-MC-GCE exhibits a potential application for real water sample analysis.
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Materials Today Physics
·
2020
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IF 10.443
S. Pan,L. Liu,Z. Li,X. Yan,C. Wang,K. Guo,J. Yang,Y. Jiang,J. Luo,W. Zhang
Complex diamond-like chalcogenides , A 2 Cu 3 In 3 Te 8 (A = Zn, Cd, Mn, Mg), were discovered and demonstrated to be promising thermoelectric materials in our prior work. Here we disclose that in-situ nanodomains coherently embedded in the A 2 Cu 3 In 3 Te 8 (A = Zn, Cd) matrixes are generated by the chemical composition fluctuation. Cations enter into the interstitial lattice sites to form in-situ nanodomains, which slightly influence electron migration but effectively scatter phonons . The nanodomains can be successfully tailored by further composition fluctuation with the substitution of Cu + for A 2+ , resulting in significantly improved electrical transport properties and reduced lattice thermal conductivity . The peak zT values of ∼1.0 and 1.2 at 873 K are achieved for Zn 1.6 Cu 3.4 In 3 Te 8 and Cd 1.6 Cu 3.4 In 3 Te 8 , respectively, exceeding the hitherto reported zT values among quaternary diamond-like chalcogenides. Manipulating in-situ nanodomains in A 2 Cu 3 In 3 Te 8 by introducing chemical composition fluctuation renders a promise in enhancing thermoelectric efficiency by nanostructure engineering within the complex thermoelectric materials.
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