ACS Applied Nano Materials
·
2023
·
IF 5.9
Dandan Wang,Lixia Luo,Daoting Deng,Guoao Gong,Jiangyang Qin,Ke Cai,Yingying Gu,Yong Mei
Nuclear matrix protein 22 (NMP22) is considered one of the noninvasive biological indications in the urine that has recently captured extensive clinical attention for bladder cancer screening and surveillance. Hence, it is imperative to create a straightforward, sensitive, and precise NMP22 assay. As a type of carbon nanomaterial, carboxylated multiwalled carbon nanotubes (CMWCNTs) exhibit exceptional electrical conductivity and abundant carboxyl groups. The silver nanoparticles and zeolitic imidazolate frameworks-8 composite (AgNPs-ZIF-8), which is a three-dimensional material, possess a wide surface area, acceptable electrical conductivity, and satisfactory biocompatibility. More importantly, it can also immobilize NMP22 antibodies in striking amounts via the Ag–NH2 bonds. Along these lines, in this work, AgNPs were decorated on ZIF-8 and modified on the glassy carbon electrode together with CMWCNTs. The comparative advantages of carbon nanotubes, metal–organic frameworks, and AgNPs were successfully combined to develop an electrochemical immunosensor with superior sensitivity and reliability for the detection of NMP22 in urine. It should be mentioned that the immunosensor not only has a wide linear range (10–2 to 105 pg mL–1) and a low detection limit (8.8 fg mL–1, S/N = 3) but also exhibits robust precision, excellent selectivity, and desirable stability. Aside from that, the immunosensor was effectively utilized to detect human urine samples, demonstrating an excellent performance.
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CHEMOSPHERE
·
2023
·
IF 8.8
Yanye Tian,Yu Li,Guang-Guo Ying,Yong Feng
The extensive presence of organic micropollutants in complex water matrices requires the development of selective oxidation technologies . In this study, a novel selective oxidation process was developed via the conjunction of FeMn/CNTs with peroxymonosulfate and successfully used to remove micropollutants such as sulfamethoxazole (SMX) and bisphenol A from aqueous solutions. FeMn/CNTs were prepared using a facile co-precipitation method, characterized using a series of surface characterization techniques, and then tested for pollutant removal . The results showed that the FeMn/CNTs had much greater reactivity than CNTs , manganese oxide , and iron oxide . The pseudo-first-order rate constant with FeMn/CNTs was more than 2.9–5.7 times that of the other tested materials. The FeMn/CNTs had great reactivity in a wide range of pH values from 3.0 to 9.0, with the best reactivity found at pH values of 5.0 and 7.0. High-valent metal-oxo species such as Fe(IV) O and Mn(IV) O and superoxide anion radicals were determined to be the reactive species and were responsible for the oxidation of SMX. These reactive species were selective; therefore, the overall removal performance of SMX was not obviously influenced by high levels of water components including chloride ions, bicarbonates , and natural organic matters. The results from this study may promote the design and application of selective oxidation technologies for micropollutant abatement.
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Food Bioscience
·
2023
·
IF 5.2
Xiao-Jian Zhang,Bao-Juan Dou,Yu-Qi Wang,Fei Yang,Xue Cai,Mian Li,Zhi-Qiang Liu,Yu-Guo Zheng
Functional sugar alcohols are a kind of burgeoning food additives to substitute saccharose due to the prominent biofunctions including moderate sweetness, low calorific values and no influence on blood sugar fluctuation, thus applied widely in food, medical, health protection as well as chemical production. Traditional synthesis of functional sugar alcohols required high temperature and H 2 pressure, as well as leading to low reaction efficiency, side reactions and leaching of toxic metal ions. In the present work, Pt–Ni–Sn/MWCNTs catalyst was obtained using a liquid phase reduction method with the transition metals loading of Pt 3.4%, Ni 0.7%, Sn 0.4%, respectively. The catalyst catalyzed the preparation of xylitol , sorbitol , mannitol and galactitol with the high monosaccharide conversion (>99.5%) and yield (>99.1%) under relatively mild conditions (100 °C, 3.0 MPa H 2 ), which were lower than ever reported. For the 13-batch reuse of Pt–Ni–Sn/MWCNTs, the total conversion of xylose was 99.4% and the total yield of xylitol was 99.2%, the productivity of 103.2 g xylitol per gram of catalyst was also obtained. Besides, no side reactions, no metal ions as well as no changes of pH were observed in the reaction process. Our trimetallic catalyst exhibited valuable potential in functional sugar alcohols production.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zhiqiang Wei,Shaofang Guo,Liuyang Cheng,Ting Li,Yanli Zhang,Hui Yang
A sensitive electrochemical sensor for the simultaneous determination of acetaminophen (ACOP) and tyrosine (Tyr) was proposed based on MWCNTs-doped poly (glycine) (p-gly)/ poly (acrylic acid) (PAA) conducting polymers modified screen-printed electrode (SPE). The incorporation of MWCNTs and p- gly/ PAA composite conductive polymers brought about enhanced electro-catalytic activity and additional binding sites for ACOP and Tyr. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) were performed to investigate the electrochemical behaviors of ACOP and Tyr. Under the optimal experimental conditions, the oxidation peak currents of ACOP and Tyr increased linearly with two concentration intervals over the range of 0.25-120 μM and 0.4-150 μM, respectively. The detection limits (S/N = 3) were 0.08 μM for ACOP and 0.13 μM for Tyr. Moreover, the sensor has been successfully applied for the determination of ACOP and Tyr in human serum samples, showing its great application prospects in pharmaceutical analysis.
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高影响因子
ANALYST
·
2024
·Vol. 149
·期 4
·1271-1279
·
IF 3.6
Aiwen Su,Dan Luo,Shixuan Li,Yanli Zhang,Hongbin Wang,Lijuan Yang,Wenrong Yang,Pengfei Pang
T4 polynucleotide kinase helps with DNA recombination and repair. In this study, an electrochemical biosensor was developed for a T4 polynucleotide kinase activity assay and inhibitor screening based on phosphate pillar[5]arene and multi-walled carbon nanotube nanocomposites. The water-soluble pillar[5]arene was employed as the host to complex thionine guest molecules. The substrate DNA with a 5′-hydroxyl group initially self-assembled on the gold electrode surface through chemical adsorption of the thiol group, which was phosphorylated in the presence of T4 polynucleotide kinase. Titanium dioxide nanoparticles served as a bridge to link phosphorylated DNA and phosphate pillar[5]arene and multi-walled carbon nanotube composite due to strong phosphate-Ti4+-phosphate chemistry. Through supramolecular host–guest recognition, thionine molecules were able to penetrate the pillar[5]arene cavity, resulting in an enhanced electrochemical response signal. The electrochemical signal is proportional to the T4 polynucleotide kinase concentration in the range of 10−5 to 15 U mL−1 with a detection limit of 5 × 10−6 U mL−1. It was also effective in measuring HeLa cell lysate-related T4 polynucleotide kinase activity and inhibitor screening. The proposed method offers a unique sensing platform for kinase activity measurement, holding great potential in nucleotide kinase-target drug development, clinical diagnostics, and inhibitor screening.
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ELECTROCHIMICA ACTA
·
2014
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IF 4.086
Zhenping Liu,Haiyun Zhai,Zuanguang Chen,Qing Zhou,Zhixian Liang,Zihao Su
A novel Fe 2 O 3 nano-materials/oxygen functionalized multi-walled carbon nanotubes/triton X-100 modified carbon paste electrode (Fe 2 O 3 /MWCNTs-COOH/OP/CPE) was prepared to simultaneously detect orange G (Or G) and orange II (Or II) by electrochemical methods. Compared with the bare carbon paste electrode (CPE), Fe 2 O 3 /MWCNTs-COOH/OP/CPE exhibited obvious electrocatalytic activities towards Or G and Or II. Furthermore, the two azo dyes were identified and separated successfully, and were simultaneously determined by the redox peaks in cyclic voltammograms (CVs) and differential pulse voltammogram (DPV) under optimum conditions. In DPV, anodic peak current (Ipa) and concentrations were linearly related well for 0.1-20.0 μM Or G and 0.2-50.0 μM Or II. The limits of detection (S/N = 3) of Or G and Or II were 0.05 μM and 0.1 μM, respectively. Therefore, the electrode is suitable for the determination of Or G and Or II in industrial wastewater due to high sensitivity and selectivity, low detection limit, good reproducibility, as well as easy preparation and regeneration.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Aijuan Xie,Linghui Cao,Tianyu Shen,Yuanxinyi Zhou,Haoye Wang,Shiping Luo
As para -aminophenol (PAP) is toxic to humans, causing skin irritation, eye damage, and central nervous system depression, and it can form as a degradation product of paracetamol (PAT) under certain conditions, the simultaneous determination of PAP and PAT is crucial. This work presents the fabrication of three-dimensional ZnCo 2 O 4 @Fe 3 O 4 /MWCNTs hybrid for the simultaneous determination of PAP and PAT using ZIF-8/67@Fe 3 O 4 as precursor and MWCNTs as conductive substrate. The ZnCo 2 O 4 @Fe 3 O 4 /MWCNTs/GCE sensor exhibits linear ranges 1.0–150.0 μM with detection limits of 0.033 μM and 0.018 μM for PAP and PAT, respectively. The developed sensor was successfully used for the determination of PAP and PAT in acetaminophen tablets and lake water with satisfactory results.
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Arabian Journal of Chemistry
·
2024
·
IF 5.3
Alaaddin M.M. Saeed,Gui-Ping Cao,Ahmed S. Al-Fatesh,Salwa B. Alreshaidan,Nawab Ali,Mustapha Sani Shehu,Jun-Yang Yan
This study presents the practical synthesis of platinum nanoparticle decorated multi-walled carbon nanotubes (Pt/MWCNTs) catalysts and their novel use in hydrogenating styrene–butadiene–styrene (SBS) triblock copolymers. The Pt/MWCNTs catalyst exhibited remarkable activity and selectivity in fully hydrogenating the polystyrene and polybutadiene segments within a styrene–butadiene–styrene (SBS) triblock copolymer. The characterizations proved that the Pt/MWCNTs catalyst possesses well-dispersed Pt nanoparticles with a large specific surface area (159.5501 m 2 /g). Additionally, the catalyst is with a mesoporous structure. As a result, the catalytic hydrogenation of SBS using a Pt/MWCNTs catalyst achieves a high degree of hydrogenation, with 100 % selectivity towards the polystyrene and polybutadiene blocks in the SBS triblock copolymer at 180 °C after 9 h. The Pt/MWCNTs catalyst was characterized via SEM, TEM, HRTEM, XRD, XPS, Raman, TG, and BET. Simultaneously, the SBS and cyclic block copolymer (CBC) were characterized via GPC, FTIR, 1 H NMR, 13 C NMR, and TG. In this work, Pt/MWCNTs catalyst with high activity and selectivity is developed for unsaturated polymer hydrogenation.
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COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Mingyao Dai,Bodu Fang,Lichao Zou,Siwen Deng,Hao Ren,Yalan Li,Jiabin Chen,Shulong Zeng,Shaohong Shi,Fangchao Cheng
With the rapid development of 5G communication technology, the surge in the number of antenna modules for intelligent terminal equipment has led to the intensification of electromagnetic radiation and interference problems, posing a major threat to electronic equipment safety, information systems stability, and human health. Traditional electromagnetic shielding materials have made it difficult to meet the demand for intelligent, integrated electronics. In this study, we proposed an in-situ sedimentation strategy to fabricate flexible polyacrylonitrile/graphene@multi-walled carbon nanotubes (PAN/Gr@MWCNTs) composite film with hierarchical double-layered structures, thus realizing ultra-thin, highly conductive, and excellent electromagnetic shielding and Joule heating properties. Particularly, the as-formed hierarchical film possessed an ultra-thin thickness of 0.158 mm and a high conductivity of 1660.26 S/m, simultaneously accompanied by an electromagnetic interference shielding efficiency (EMI SE) of 42.82 dB and a specific shielding efficiency (SSE) of 271.01 dB/mm. In addition, the film exhibited excellent Joule heating capability in the voltage range of 1.50–2.25 V. This study provides innovative ideas for developing flexible electromagnetic shielding films, which are of great scientific significance and potential application in electromagnetic radiation protection.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaohan Xing,Can Wang,Xiao Du,Fengfeng Gao,Xiaogang Hao,Abuliti Abudula,Guoqing Guan
A novel carbon nanotube combining bis(2-ethylhexyl) phosphate/tributyl phosphate membrane (MWCNTs-P204/TBP membrane) with dual-site extraction function was obtained by constructing a dense P204/TBP liquid phase extraction layer in a 3D porous MWCNTs membrane and proposed a “chemical-electrochemical dual site extraction” mechanism that consists both the chemical extraction dominated by proton exchange and electrochemical extraction dominated by electrochemical complexation pathways. The membrane was applied with an electrochemically switched ion membrane extraction (ESIME) process to realize continuous selective extraction/stripping of Nd 3+ . Model calculation and DFT simulations indicate that the mass transfer rate of Nd 3+ in the feed phase is 7.45 times higher than that of Dy 3+ under the action of the electric field, and the chemical softness of P204 and Nd 3+ extraction complex 15.15 is higher than that of Dy 3+ 2.73, the coupling effect of cell voltage and pulse potential can effectively facilitate the selective extraction and stripping of Nd 3+ by MWCNTs-P204/TBP membrane. The Nd 3+ flux as high as 7.31 μmol·m −2 ·s −1 with a separation factor β Nd 3+ /Dy 3+ of 9.56 was achieved even after five times enrichments. It manifested that the ESIME system with MWCNs-P204/TBP membrane provides a scalable process for the continuous selective separation of Nd 3+ from waste permanent magnets.
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Kuwait Journal of Science
·
2025
·
IF 1.1
Mirza Nadeem Ahmad,Muhammad Naveed Anjum,Akbar Ali,Rabeya Ijaz,Sarosh Iqbal,Rashad Al-Salahi,Hatem A. Abuelizz,Cedric Delattre
The synthesis of poly( o -anisidine)/multi-walled carbon nanotubes composite (POA/MWCNTs NC) was carried out via chemical oxidative polymerization for the adsorptive removal of Direct Yellow 26 dye (DY 26). In the polymerization, the ammonium persulphate was used as an oxidant along with 4,4′-diaminodiphenylamine dimer as initiator. Then, the structural composition, crystalline properties, absorption behavior, morphology, and surface attributes of both the polymer and the nanocomposite were analyzed by different techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), UV–visible spectroscopy (UV–visible), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller analysis (BET). BET analysis showed significant improvement in the surface area (690 m 2 /g) and porosity (0.216 cm 3 /g) of the composite material as compared to pure POA. Further, the composite was applied for the elimination of DY 26 in aqueous media. Moreover, the adsorption parameters were also optimized like pH, contact time, adsorbent dose and dye concentration. The highest dye removal efficiency was achieved up to 83% against 50 mg/L concentration of dye solution under the conditions of pH at 2, contact time of 30 min, and 2 g amount of the adsorbent. Furthermore, the kinetic studies revealed that the adsorption of DY 26 followed the pseudo first-order rate constant by the polymeric adsorbent.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jin Fang,Zhiwei Zhao,Zhenzhen Xu,Qingqing Ni
Moisture electricity generator (MEG) is a green and environmental-friendly energy harvesting technology, and the ubiquitous presence of moisture makes it a strong competitor for mobile power. Among the available structural forms, fibrous MEG with engineered tunability and high integrality are perhaps one of the most promising solutions. However, the continuous preparation of fibrous MEG limits their scale-up production and commercial application. Herein, we utilized sodium alginate (SA) and multi-walled carbon nanotubes (MWCNTs) in combination with microfluidic sequential wet spinning to continuously fabricate axial heterogeneous structure fiber, where the gradient of oxygen-containing functional groups is critical for electricity generation. A single unit (1 cm) can produce an open-circuit voltage (V oc ) of 0.26 V, a short-circuit current (I sc ) of 2.59 μA, and a power density of 0.80 μW/cm 2 under moisture stimulation. The energy output can be easily increased by a simple series/parallel connection. Benefiting from the axial heterogeneous structure, the fibrous MEG can continuously output 0.2–0.25 V for more than 168 h. Furthermore, we extended the functionality and practicality of the fibrous MEG by incorporating materials with pH-responsive functions, which enables visual monitoring of acid/alkali gases. Overall, this work creates a new strategy for the structural design and large-scale continuous production of multifunctional fiber-based electronics.
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