JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 37
·期 1
·45
·
IF 2.8
Luo Youmei,Gao Ziwei,Zhan Jiayin,Liu Shengda,Liu Guixia
Chromium (Cr), especially Cr(VI), is a notorious heavy metal pollutant with high toxicity, posing serious threats to ecosystems and human health. Recently, biomass-derived carbon dots (B-CDs) have emerged as promising materials in the field of sensing due to their low cost, environmental friendliness, and good optical properties. Developing a simple, sensitive, selective, and portable sensing platform based on B-CDs for the efficient detection of Cr(VI) in real environmental water samples is urgently required. Here, nitrogen-doped blue-fluorescent B-CDs were successfully synthesized via a one-step hydrothermal method utilizing loofah biomass as the carbon source and ethylenediamine as the nitrogen source. The as-prepared B-CDs possess abundant surface functional groups, excellent water solubility, remarkable fluorescence stability, and high selectivity toward Cr(VI). The B-CDs exhibit a wide linear detection range for Cr(VI) from 10 to 1000 μmol L −1 with a low detection limit of 194 nmol L −1 . The quenching mechanism was determined to be an internal filter effect. This method has been effectively applied to the accurate analysis of real water samples. Furthermore, portable paper-based and hydrogel-based sensors incorporating B-CDs have been developed, enabling convenient on-site detection of Cr(VI) in practical scenarios.
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CARBOHYDRATE POLYMERS
·
2026
·
IF 13.2
Yiping Chen,Keqian Xu,Xin Guo,Wen Xu,Qian Cao,Dong Xu,Aiqing Yu,Zhenbo Cheng,Jiawei Liang,Feiyang Jiang
Polysaccharide hydrogels are promising for coupled Cr(VI) adsorption and photocatalytic reduction, but conventional co-loaded designs provide limited control over functional-domain organization and catalyst–carrier contact. Here, we constructed a dual-carrier polysaccharide hydrogel (SH-3) in which two TEMPO-oxidized cellulose nanofibril (TOCNF) populations independently host the photocatalyst and electron-mediator domains. α-FeOOH was grown in situ on one TOCNF population through Fe 3+ /carboxylate-guided hydrothermal nucleation, while chitosan-derived carbon dots (CS-CDs) were covalently grafted onto a second population by amide coupling. The two functionalized carriers were co-incorporated into a three-dimensional porous network, placing the two functional domains on distinct TOCNF populations while enabling their functional coupling. SH-3 achieved a Langmuir Q max of 176.1 mg g −1 for total-Cr uptake from Cr(VI)-containing solution and an apparent Cr(VI) depletion rate constant of 0.1341 min −1 , outperforming the physically co-mixed control and literature-derived benchmark. Spectroscopic and electrochemical analyses indicated improved charge separation, electron/•O 2 − -mediated Cr(VI) reduction, and partial solid-phase retention of generated Cr(III). These results identify carrier-level organization of functionalized TOCNF populations as a design variable for coupling adsorption and photocatalysis within a polysaccharide hydrogel. Download: Download high-res image (492KB) Download: Download full-size image
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2026
·
IF 5.2
Pengyu Zhang,Jinping Zhang,Yuan Cheng,Hongwei Wang,Minghui Tan,Yake Wang,Tong Zhang,Yunchao Mu,Joshi Mahesh Kumar,Xinli Li
In response to the rising severity of co-pollution from heavy metal ions and organic antibiotics in water, creating efficient synergistic removal technologies has become a critical research direction in environmental catalysis. In this study, a BiVO 4 /SnS 2 /Bi 2 S 3 ternary heterojunction photocatalyst with a broad spectral response was successfully constructed through a hierarchical construction strategy, using a hydrothermally synthesized BiVO 4 /SnS 2 binary heterojunction as the precursor, followed by in-situ growth of narrow-bandgap Bi 2 S 3 nanoparticles via a room-temperature ion exchange method. Characterization results from XRD, TEM and XPS confirmed that SnS 2 nanosheets and Bi 2 S 3 nanoparticles were distributed on the BiVO 4 surface, forming a tightly contacted heterojunction interface. The sequential introduction of SnS 2 and Bi 2 S 3 significantly increased the specific surface area of the material (to 14.723 m 2 /g). Optical performance tests demonstrated that the ternary heterojunction exhibited substantially enhanced visible light absorption, with the bandgap narrowing to 2.21 eV. Electrochemical tests revealed a significant reduction in the interfacial charge transfer resistance and a marked improvement in the charge carrier separation efficiency. Photocatalytic performance evaluation indicated that under simulated solar irradiation, BV/SN/BS(1 h) achieved a Cr(VI) reduction rate constant (0.07032 min −1 ) over 15 times higher than that of pure BiVO 4 and a TC degradation rate constant (0.00520 min −1 ) approximately 1.3 times higher. In the Cr(VI)-TC combined system, a significant synergistic degradation effect was observed, with the Cr(VI) reduction rate constant further increasing to 0.09252 min −1 and the TC degradation rate constant rising to 0.01471 min −1 . Notably, EPR tests did not detect •O 2 − or •OH radicals. DFT calculations combined with experimental characterization revealed the formation of a type-II heterojunction among BiVO 4 , SnS 2 and Bi 2 S 3 , in which electrons and holes migrate in opposite directions, achieving efficient charge carrier separation. Cr(VI) and TC act as mutual sacrificial agents during the reaction process, further enhancing the photocatalytic efficiency. This study provides a novel material construction strategy and theoretical basis for designing efficient photocatalytic systems aimed at the synergistic degradation of heavy metal-organic pollutants from complex water bodies.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Yihuan Song,Feng Guo,Pingxiu Zeng,Jinhua Liu,Yuanchao Wang,Heyong Cheng
Toxicity, mobility, bioavailability and biofunctions of chromium, cadmium, mercury and lead are heavily dependent upon their specific chemical forms, leading to a high demand to metal speciation analysis rather than total quantification. Simultaneous speciation analysis of multiple metal(loid)s is attractive to a large sample capacity containing unstable analytes due to its economic and environmental advantages over the conventional single elemental strategies. In this work, an analytical method integrating online solid phase extraction into high performance liquid chromatography interfaced with inductively coupled plasma mass spectrometry (ICP-MS) to simultaneously preconcentrate and quantify Cr, Cd, Hg and Pb forms in pg L −1 levels in water was developed. Cr(III + VI), Cd(II), Hg(II), Pb(II), methylmercury (MeHg), ethylmercury (EtHg), and trimethyl (TML) and triethyl lead (TEL) were captured by the C 18 adsorbent (equilibrated with 10 mL of 1.0 mM 2-hydroxyethanethiol at 10 mL min −1 ) and eluted by mobile phase (5.0 mM Cys at pH 2.0), then completely separated on the C 18 column within 8.0 min and eventually determined by ICP-MS. Low limits of detection (0.001–0.007 ng L −1 ) and quantification (0.003–0.023 ng L −1 ), good relative standard deviations (<4%) and high enrichment factors (827–2656 folds) were obtained with good linearities. Three reference materials of total cadmium (GBW08602), total mercury (GBW08603) and total lead (GBW08601) in water were analyzed by the developed method to validate the accuracy with good agreement with certified values and satisfactory recoveries (92–100%). This method was proved feasible by the determination of Cr, Cd, Hg and Pb compounds in drinking water , river water, pond water and tap water .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chunchun Wang,Shijie Li,Mingjie Cai,Ruyu Yan,Kexin Dong,Junlei Zhang,Yanping Liu
Constructing novel Z-scheme heterojunctions is an effective strategy for obtaining high-performance photocatalysts. Herein, tetra (4-carboxyphenyl) porphyrin (TCPP) and graphene quantum dots (GQDs) were loaded on the surface of Bi 2 MoO 6 (BMO) to fabricate novel Z-scheme heterojunctions of TCPP/G/BMO. Especially, TCPP/G/BMO-2 showed an exceptional visible-light photoactivity for tetracycline (TC) degradation (81.0%, 40 min) and Cr(VI) reduction (90.7%, 60 min), respectively by 2.38 folds and 2.96 folds enhancement compared to sole Bi 2 MoO 6 . The substantial enhancement of activity is attributed to the synergy effect of the Z-scheme charge transfer mechanism and the improved light absorption. The degradation pathways of TC were inferred by determining the generated intermediates using high performance liquid chromatography-mass spectrometry (HPLC-MS), and the toxicity of the transformation products was assessed by Toxicity Estimation Software Tool (T.E.S.T). Overall, on the basis of trapping experiments and electron spin resonance spectra (ESR) analysis, the photocatalytic mechanisms of Cr(VI) reduction and TC degradation by the TCPP/G/BMO Z-scheme heterojunction was proposed. This work indicates TCPP/G/BMO could be a promising photocatalyst for wastewater treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Junxia Shao,Heng Fei,Hua Li,Liujun Yang,Miaomiao Li,Jin Gao,Huarong Liao,Jianmei Lu
Promoting carrier separation has received much attention owing to attractive enhancement effects in improving the utilization efficiency of photo-generated carrier. However, the photocatalytic performance has remained limiting mainly due to lack of magnifying carrier generation fundamentally. Herein, carrier generation enhanced CNS 0.6 /Au-1 is established by loading ultrafine Au nanoparticles on S-doped carbon nitride (CNS x ) for efficient hexavalent chromium degradation. CNS x can activate the n → π* electronic transition of carbon nitride besides keeping the original π → π* electronic transition. Plasmon-induced hot electron of Au nanoparticles merge with e − excited from π → π* and n → π* transition in CNS x increasing the amount of catalytically effective electrons, and the efficient carrier separation is also achieved. Near-infrared absorption CNS 0.6 /Au-1 exhibits a remarkable photo-reactivity for the degradation of Cr(Ⅵ), which can degrade 10 ppm Cr(Ⅵ) completely within 40 min. This work proposes a general strategy of increasing different types of electron transitions to promote carrier generation.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lixiang Zhang,Luping Feng,Pan Li,Xi Chen,Yuan Gao,Yushuang Gong,Zhongling Du,Sheng Zhang,Anchao Zhang,Guofu Chen,Hua Wang
A direct Z-scheme heterojunction has been constructed by loading cadmium sulfide (CdS) on cobalt sulfide doped with nitrogen (N-CoS x ) by N 2 plasma treatment for efficient photocatalytic Cr(VI) reduction under visible light. It was discovered that the resulting CdS/N-CoS x nanocomposites could present different photocatalytic performances controllably depending on the plasma treatment time and CdS-to-N-CoS x ratios. Especially, the one with 5-min plasma treatment and 8/1 M ratio could exhibit the highest Cr(VI) photoreduction efficiency, which is over four and two folds higher than those of pristine N-CoS x and CdS, respectively. Herein, the plasma-assisted N doping could not only increase the surface wettability and conductivity of CoS x but also decrease its Fermi level for improving the photocatalytic Cr(VI) reduction. More importantly, a direct Z-scheme heterojunction could be constructed by the combination of CdS and N-CoS x with suitable band structures, which could further booster the charge separation and transferring, without sacrificing the redox capacity of photogenerated carriers. The enhanced photocatalytic activity and stability of CdS/N-CoS x nanocomposites could thereby be expected for Cr(VI) reduction, with the efficiency up to 100% within 25 min. Such a direct Z-scheme heterojunction created by the plasma treatment route may promise for the large-scale applications for the removal of various toxic pollutants in the environmental remediation field.
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BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Xiaolin Zhong,Min Zhang,Lu'an Guo,Yongze Xie,Renfeng Luo,Wenxue Chen,Faliang Cheng,Lishi Wang
Designing a photoelectrochemical (PEC) immunosensor that can produce dual photocurrent signals which can refer to each other is a great importance but a big challenge. In this manuscript, a novel dual photocurrent signals immunosensor was constructed for the detection of α-fetoprotein (AFP). Unlike the usual method of using two composite materials to provide cathode and anode photocurrent respectively, this work applies only one compound of MIL-101 (Cr) and CdSe quantum dots (QDs). Thereinto, we found that the photocurrent polarity of MIL-101(Cr) would switch by adjusting applied voltage . And then CdSe QDs was introduced by simple ultrasound mixing to boost the dual photocurrent signals. Furthermore, in the composite of M&C, the electron transfer path between MIL-101(Cr) and CdSe QDs may switch between “Z-type” and “Ⅱ-type” by adjusting voltage. Benefiting by the dual signals, the proposed sensor can not only perform sensitively quantitative detection of α-fetoprotein (AFP), but also can intuitively estimate the accuracy and reliability of the test result by determining whether the corresponding relationship of “cathode photocurrent-analyte concentration-anode photocurrent” is established. The linear ranges of the sensing electrodes as cathode and anode are the same, both from 0.1 to 300 ng mL −1 . The limit of detection (LOD) is 0.082 ng mL −1 (S/N = 3) when it used as an anode, and the LOD is 0.054 ng mL −1 (S/N = 3) when it served as cathode. Furthermore, this sensor showed acceptable stability, reproducibility, specificity, and feasibility of detecting AFP in human serum, which has broad development prospects in the early clinical diagnosis.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Wanli Lu,Chao Duan,Yanling Zhang,Kun Gao,Lei Dai,Mengxia Shen,Wenliang Wang,Jian Wang,Yonghao Ni
Electrospun nanofiber membrane (ENM) shows great advantage and potential in wastewater treatment due to its unique properties. However, exploring a green and efficient ENM for remediation of complex wastewater, such as simultaneous containing oils, dyes and heavy metal ion, remains challenging. In this work, a cellulose-based photocatalytic ENM, is constructed for this purpose. The hybrid ENM is prepared via electrospinning deacetylated cellulose acetate/polyvinyl pyrrolidone (CeP) nanofibers as skeleton cores and in-situ synthesis of beta hydroxyl oxidize iron decorated iron-based MOF (β-FeOOH@MIL-100(Fe)) heterojunctions as photocatalytic sheaths. The core-sheath structured ENM has ultrahigh MIL-100(Fe) loading (78 wt%), large surface areas (1105 m 2 /g) and well-dispersed β-FeOOH nanorods. Thanks to these porous and hydrophilic MIL-100(Fe), along with a robust photocatalysis-Fenton synergy from β-FeOOH@MIL-100(Fe), the as-prepared ENM shows outstanding performances with simultaneous high removal efficiency for oils (99.5 %), dyes (99.4 %) and chromium ion (Cr(VI)) (99.7 %). Additionally, the photocatalytic ENM can achieve a long-term reuse owing to its inherent self-cleaning function.
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NANO
·
2020
·
IF 1.566
Suping Wang,Yujiao Tu,Kunhao Qin,Xiaotian Yuan,Wei Chen,Yunlin Wei,Zhiwei Xu,Qi Zhang,Xiuling Ji
Phenolic compounds, especially 4-nitrophenol (4-NP), and chromium (VI) are highly toxic environmental pollutants. Thus, it is significantly important to establish a rapid and sensitive sensor for 4-NP and Cr(VI) monitoring in environment. In this paper, a novel approach has been adopted where E. coli -derived CDs (CDs- WT ) prepared by one step hydrothermal method previously and sensitized by ampicillin (turn-on) were used as fluorescence nanoprobe (CDs- WT -Amp) for 4-NP and Cr(VI) determination based on the inner filter effect quenching mechanism (turn-off). Then, the quenching fluorescence was reversed by addition of ampicillin (turn-on). The linear ranges of 4-NP and Cr(VI) detection were 0–50 μ M and 0–25 μ M, with the limits of detection 88.89 nM and 64.75 nM, respectively. The “turn-on-on-off-on” fluorescent nanosensor system was successfully used to determine Cr(VI) and 4-NP in water with satisfactory results. It shows that the “turn-on-off-on” nanoprobe has great promising potential for application to environmental pollutant detection.
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MOLECULES
·
2019
·Vol. 25
·期 1
·47
·
IF 3.06
Chunlei Jiao,Xiao Tan,Aijun Lin,Wenjie Yang
Nanometer zero-valent iron (nZVI) has been widely used in the treatment of heavy metals such as hexavalent chromium (Cr(VI)). A novel composite of bead string-structured nZVI on modified activated carbon (nZVI–MAC) is prepared here, using polyethylene glycol as the stable dispersant rather than traditional ethanol during the loading process. The microstructure characterization shows that nZVI particles are loaded on MAC with a bead string structure in large quantity and stably due to the addition of hydroxyl functional groups on the surface by polyethylene glycol. Experiments on the treatment of Cr(VI) in wastewater show that the reaction process requires only 20 min to achieve equilibrium. The removal rate of Cr(VI) with a low concentration (80–100 mg/L) is over 99% and the maximum saturation removal capacity is up to 66 mg/g. The system converts Cr(VI) to trivalent chromium (Cr(III)) through an oxidation-reduction effect and forms an insoluble material with iron ions by coprecipitation, which is then adsorbed on the surface of the nZVI–MAC. The process conforms to the quasi-second order adsorption kinetics equation (mainly chemical adsorption process).Keywords:bead string structure;nZVI;polyethylene glycol;Cr(VI) wastewater
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-8
·
IF 5.479
Jiang Yanxiao,Ma Pinyi,Piao Huilan,Qin Zucheng,Tao Shuo,Sun Ying,Wang Xinghua,Song Daqian
Cellulose paper was coated with the metal-organic framework MIL-101(Cr) in a chitosan matrix and utilized for thin-film microextraction (TFME). The coated paper possesses excellent extraction efficiency for the triazine herbicides atraton, desmetryn, secbumeton, prometon, ametryn, dipropetryn, and dimethametryn. High-performance liquid chromatography-tandem mass spectrometry was applied to quantify target analytes. The effects of mass ratio of MIL-101(Cr) to chitosan, sample pH value, time of adsorption and desorption, and type and volume of desorption solvent on extraction efficiency were optimized. Under the optimal conditions, the method has limits of detection between 1.5 and 22 ng·L −1 . The recoveries of triazines from spiked tap water, drinking water, lake water and river water range from 77.0 to 125.3%, with relative standard deviations of <17.4%.
Cellulose paper was modified with metal-organic framework MIL-101(Cr)/chitosan by using a simple, efficient and environmentally friendly approach. The modified cellulose paper was then used as a novel extraction phase in thin-film microextraction (TFME).
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