ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 36
·36776-36785
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IF 2.914
Ren Zhichang,Wu Wanlin,Yu Ling,Yu Yang
Thallium as a highly toxic metal element has been listed as one of priority drinking water contaminants. In this study, manganese oxide nanoparticles were synthesized through a simple hydrothermal method and applied for the removal of thallium(I). The adsorbent was composed of numerous needle-like nanorods and had an average volume diameter of 230 nm after heat-drying procedure. The crystal form of adsorbent was determined as α -MnO 2 . The adsorbent exhibited a much faster adsorption rate than most of previously reported adsorbent, achieving over 66.4% of equilibrium adsorption capacity in the first 10 min. The adsorption process was found to be highly affected by solution pH and higher than 100 mg/g of adsorption capacity could be obtained in a wide pH range of 6.0–10.0. The isotherm study indicated that the adsorption of Tl(I) on the adsorbent was favorable and governed by a chemisorption process, with the maximum adsorption capacity of 505.5 mg/g at pH 7.0. The adsorption process was confirmed to be thermodynamically spontaneous and endothermic. The presence of Na + , K + , Mg 2+ , Ca 2+ , and Cu 2+ cations had certain negative effects on the uptake of Tl(I). Based on the batch experiments and XPS analysis, the deprotonated hydroxyl groups that bonded to manganese atoms worked as the binding sites for the effective removal of Tl(I) ions and no redox reaction occurred during the adsorption process.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Qian Ye,Hao Xu,Jing Zhang,Qingguo Wang,Peng Zhou,Yunqi Wang,Xue Huang,Xiaowei Huo,Chaorong Liu,Jinfeng Lu
This work presented a new strategy to activate peroxymonosulfate (PMS) by the addition of nano-zero-valent tungsten (nZVT) via accelerating the redox cycles of Cu(II)/Cu(I), which induce the consecutive generation of highly reactive oxygen species ultimately. The oxidation capacity of the nZVT/Cu(II)/PMS process and the detailed mechanisms of PMS activation were investigated with tetracycline (TC) as the targeted pollutant. Our results indicated that about 70% TC removal was obtained in the nZVT/Cu(II)/PMS system in 15 min with an initial pH of 4.6. In addition, hydroxyl radicals ( OH), sulfate radicals (SO 4 − ), and superoxide radicals ( O 2 − ) were identified as the reactive oxygen species (ROSs) attributed to rapid TC decomposition according to the quenching studies and EPR technology. The effective component that was responsible for PMS activation and ROSs generation was ascertained to be the resulting Cu(I), which derived from the direct reduction pathway driven by epigenetic low valence tungsten species and the indirect reduction pathway driven by active hydrogen atoms. Further, the presence of Cu(II) significantly accelerated the corrosion of the nZVT powders, leading to the accumulation of low valence tungsten species and the decrease in the mean diameter of the ZVT nanoparticles. There was no obvious change of the composition and structure between the original and residual nZVT powders, as evidenced by XPS and XRD analysis. The degradation process of TC included the cleavage of specific functional groups, the ring-opening reactions and the hydroxylation process. This study provided theoretical significance in applying zero-valent metals to activate PMS through a cupric/cuprous redox cycling mechanism.
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ACS Sensors
·
2019
·
IF 6.944
Liping Zhu,Jing Ye,Mengxia Yan,Qiuju Zhu,Shuang Wang,Jianshe Huang,Xiurong Yang
Measurement of cardiac troponin I in the blood is crucial for the early diagnosis of acute myocardial infarction. Herein, a novel and ultrasensitive electrochemiluminescence (ECL) immunosensor has been developed for determination of cardiac troponin I (cTnI) by using Au nanoclusters and hybridization chain reaction (HCR) signal amplification. In this ECL immunosensor, Au nanoclusters were dual-labeled at each end of hairpin DNA (H1 and H2) and acted as the luminophore. DNA initiator strands (T1) and secondary antibody (Ab2) were conjugated on Au nanoparticles (AuNPs) to obtain a smart probe (Ab2-AuNP-T1). In the presence of target cTnI, the sandwiched immunocomplex composed of cTnI, Ab1, and Ab2-AuNP-T1 was formed. Then the initiator strands T1 of Ab2-AuNP-T1 opened the hairpin DNA structures and triggered a cascade of hybridization events. Consequently, a large number of Au NCs were indirectly modified on the surface of the electrode, which could react with the coreactant (K2S2O8) and emit a strong ECL signal. Under the optimal conditions, the immunosensor exhibited a wide detection range for cTnI from 5 fg/mL to 50 ng/mL and a low detection limit of 1.01 fg/mL (S/N = 3). Because of the excellent specificity, stability, and reproducibility of the proposed ECL-HCR sensor, it has a great application prospect for cTnI detection in clinical diagnosis.
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Environmental Technology & Innovation
·
2023
·
IF 7.1
Siqi He,Sakil Mahmud,Zhu Xiong,Yiwen Shi,Jiangyan Lu,Yuhang Cheng,Wei Zhang,Li Yu,Gaosheng Zhang
In natural freshwater and wastewater environments, thallium (Tl) is an infrequent yet exceptionally toxic heavy metal, presenting a formidable peril to human health. The arsenal of substances accessible for Tl(I) adsorption encompasses biochar, activated carbon, metal oxides, and diverse materials. The adsorption capabilities of activated carbon and biochar are limited, while metal oxide materials are expensive and challenging to regenerate. Developing cost-effective materials with high selectivity for Tl(I) removal poses an ongoing challenge in material technology. In this investigation, a novel composite denoted as PB@PDA/PEI-MF has been successfully synthesized, comprising Melamine Foam (MF) co-supported with Prussian blue nanoparticles (PB NPs) via the incorporation of polydopamine (PDA) and polyethyleneimine (PEI). The PB@PDA/PEI-MF material demonstrates remarkable efficacy in the efficient sequestration of Tl(I) across a broad pH spectrum, ranging from 6 to 10. Moreover, even in the incidence of various coexisting metal ions (e.g., Na + , K + , or Ca 2+ ), the Tl(I) removal rate by PB@PDA/PEI-MF remains consistently high, exceeding or equal to 90%. Its high selectivity, anti-ion interference ability, and ease of recycling address the most prominent shortcomings of previous materials. Leveraging these advantages, the PB@PDA/PEI-MF material demonstrates exceptional proficiency in the remediation of real-world Tl(I)-contaminated Pearl River water, aligning with the stringent industrial wastewater standards. The conclusive outcomes affirm that PB@PDA/PEI-MF presents a viable technological solution for the effective removal of Tl(I) in intricate environmental contexts.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Xiaolun Peng,Rongxiang He,Junhui Xu,Chunhua Cao,Wei Wen,Xiuhua Zhang,Shengfu Wang
The sensitive and accurate detection of cardiac troponin I (cTnI) as a gold biomarker for cardiovascular diseases at an early stage is crucial but has long been a challenge. In this study, we presented such an electrochemical (EC) aptasensor by combining hybridization chain reaction (HCR)-enhanced electrochemically mediated atom transfer radical polymerization (eATRP) amplification with high-efficient separation of magnetic beads (MBs). Aptamer-modified MBs empowered effective recognition and separation of cTnI from complex samples with high specificity. The specific binding of cTnI and aptamer could release triggered DNA (T-DNA) into solution to drive an HCR process, which produced plentiful active sites for eATRP initiators labeling followed by initiating eATRP process. With the development of eATRP, a great many of electroactive polymer probes were continually in situ formed to generate amplified current output for signal enhancement. Compared to no amplification, HCR-enhanced eATRP promoted the signals by ∼10-fold, greatly improving detection sensitivity for low-abundant cTnI analysis. Integrating MBs as capture carriers with HCR-enhanced eATRP as amplification strategy, this EC aptasensor achieved a low detection limit of 10.9 fg/mL for cTnI detection. Furthermore, the reliable detectability and anti-interference were confirmed in serum samples, indicating its promising application toward early diagnosis of cardiovascular diseases.
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Laser & Photonics Reviews
·
2023
·Vol. 18
·期 1
·2300784
·
IF 11
Taoze Wang,Yuzhen Wang,Weibin Chen,Zhiguo Xia
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) lighting sources are applied in non-destructive examination and illumination supplements for night monitoring. As a critical component of NIR pc-LED, NIR phosphors are required to possess a high external quantum efficiency (EQE), super thermal stability, and broadband emission to meet applications. Here, Na 2 SrGe 6 O 14 :Cr 3+ (NSGO:Cr) glass ceramics (GC) bulk via highly crystallization from glass precursor is fabricated and demonstrates an ultrabroad emission band centered at 815 nm with a full width at half-maximum (FWHM) of 214 nm and a high EQE of 49.2%. Moreover, Yb 3+ co-doping significantly enhances Cr 3+ → Yb 3+ energy transfer (ET) due to the stronger Yb 3+ : 2 F 7/2 - 2 F 5/2 absorption. Benefiting from the ET process, the Cr/Yb co-doped GC exhibits NIR-I/II emission with improved thermal stability from 30.1% to 65.0%. Furthermore, an encapsulant-free NIR GC-converted LED (GCc-LED) is prepared and exhibits 52.2 mW NIR output power with a high photoelectric conversion efficiency (PCE) of 19.4%. Under a large current of 600 mA, the NIR device exhibits a watt-level output power of 922.4 mW with a PCE of 9.1%. Compared to conventional NIR powder phosphors, NSGO:Cr/Yb GC with high performance can open up an avenue for the fabrication of high power NIR lighting sources.
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Separations
·
2021
·Vol. 8
·期 2
·22
·
IF 2.777
Pei Chen,Xiaoman Li,Xuemin Yan,Minglei Tian
(1) Background: ZIF-67 is one of the most intriguing metal–organic frameworks already applied in liquid adsorption. To increase its adsorption performance, dual ionic liquids were immobilized on ZIF-67 in this research; (2) Methods: The obtained sorbent was used to adsorb aristolochic acid I (AAI) in standard solutions. Then, the sorbent was applied in solid-phase extraction to remove AAI fromFibraurea Recisa Pierreextracted solution. (3) Results: By analyzing the adsorption models, the highest adsorption capacity of immobilized sorbent (50.9 mg/g) was obtained at 25 °C within 120 min. In the SPE process, 0.02 mg of AAI was removed per gram of herbal plant, the adequate recoveries were in the range of 96.2–100.0%, and RSDs were 3.5–4.0%; (4) Conclusions: The provided experimental data revealed that ZIF-67@EIM-MIM was an excellent potential sorbent to adsorb and remove AAI from herbal plant extract, and the successful separation indicated that this sorbent could be an ideal material for the pretreatment of herbal plants containing AAI.Keywords:dual ionic liquids;metal–organic framework;aristolochic acid I;Fibraurea Recisa Pierre
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 37
·12750-12758
·
IF 6.4
Zhiquan An,Siying Chen,Tao Lu,Pengjun Zhao,Xiaodong Yang,Yang Li,Juan Hou
Passivation of the buried interface benefits the poor crystallization of perovskite films caused by defects, improves the interface contact with the electron transport layer and inhibits severe non-radiative recombination. The 4′-methoxy-2′-nitroacetanilide (ANE) molecule has a variety of active sites, including CO, C–O–C and NOO, and is promising to be used as an interface modifier in perovskite solar cells. Our research confirms that ANE could reduce defects by forming chemical interactions with both SnO2 and the perovskite layer. The quality of the perovskite and SnO2 is enhanced with suppressed non-radiative recombination. Finally, the power conversion efficiency (PCE) of a champion device is improved to 22.63%. The target device retains 92% of its initial PCE (22.27%) after 1200 hour storage in the air. This study provides a key to designing and screening multifunctional passivators to improve the performance of PSCs.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chenhui Yan,Junyu Li,Chuan Tan,Guangyuan Chen,Qian Zhao,Yuxuan Chen,Pan He,Yulong Luo,Tao Duan,Jiehong Lei,Lin Zhu
The efficient capture and immobilization of radioiodine (I–, IO3–) is of great importance in radioactive waste management. Here, a Cu2O-loaded three-dimensional bulk cationic hydrogel composite (Cu2O@CH) was successfully prepared by simple redox reactions and UV photopolymerization, which realized the rapid enrichment and efficient immobilization of I– and IO3–. The adsorption experiments showed that the maximum adsorption capacity of Cu2O@CH for I– in the solution at pH = 3 reached 416.5 mg/g, and the adsorption capacity of IO3– in the solution at pH = 6 could reach 313.4 mg/g. It exhibited extremely fast adsorption kinetics for I– and IO3–. In addition, Cu2O@CH also exhibited efficient I– and IO3– removal from simulated high-level liquid waste. The rapid capture and effective immobilization of radioiodine (I–, IO3–) were realized by the electrostatic interaction of −N+(CH3)3 groups in Cu2O@CH with I– and IO3–, as well as the chemical reactions between Cu2O and I–. The bulk cationic hydrogel composite explored the multifunctional role toward fast, high adsorption capability and easy handling, highlighting its superiority compared to the powder adsorbent, which renders it a potential adsorbent for the removal of radioactive iodine (I–, IO3–) in nuclear wastewater treatment.
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JOURNAL OF ORGANIC CHEMISTRY
·
2023
·
IF 3.6
Haiyun Peng,Yangyi Zhang,Guisheng Deng
Silver(I)-catalyzed tandem reaction of enynones with 4-alkenyl isoxazoles provides access to 2-(furan-2-yl)-1,2-dihydropyridines. No competitive cyclopropanation of alkenes and O–H insertion via (2-furyl)carbene complexes were observed. The cascade reaction proceeds via the formation of (2-furyl)metal carbene intermediate, the N–O bond cleavage of 4-alkenyl isoxazoles/rearrangement, subsequent 6π electrocyclic reaction, and [1,5] H-shift. The successive construction of both 1,2-dihydropyridine skeleton and furan frame has been achieved in the one-pot reaction. A broad range of readily available enynones and 4-alkenyl isoxazoles are suitable to this protocol; however, when R3 is the alkyl group such as n-Bu and Me, a complicated mixture was generated without the desired products. In addition, in the case of R4 = bulky group such as R3′SiOCH2, the reaction gave an in situ oxo-product of (2-furyl)silver carbene. An atom-economic strategy for the synthesis of 2-(furan-2-yl)-1,2-dihydropyridines has been established.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Ming Li,Tongyan Ren,Yubao Li,Shuang Li,Ping He,Yao Xiao,Jiufu Chen
In this study, a series of promising binary hybrid heterojunction CdIn 2 S 4 /ZnS (CIS/ZnS) were constructed via a facile hydrothermal method . Credible characterization methods including powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV–vis diffuse reflectance spectra (DRS) were carried out to investigate the physicochemical properties the as-obtained photocatalysts . Photocatalytic water splitting for hydrogen evolution was performed to evaluate the photocatalytic activity of the photocatalyst. The results indicate that the light-harvesting ability could be markedly enhanced by decorating CdIn 2 S 4 on ZnS microspheres . Compared with the pristine CdIn 2 S 4 and ZnS, the hybrid photocatalysts present more efficient photocatalytic hydrogen production performance. Among composite photocatalysts, the 5% CIS/ZnS sample manifests the highest photocatalytic hydrogen production rate of 10.80 mmol g −1 h −1 , which is 2.6 and 5.4 times higher than that of ZnS and CdIn 2 S 4 , respectively. Moreover, a type-I band alignment mechanism was prudently put forward to interpret the photocatalytic hydrogen generation activity. The boosted photocatalytic hydrogen evolution activities of CIS/ZnS can be attributed to the enhanced light-harvesting ability, efficient separation and transfer of the photo-induced charge carriers, and inhibition of electrons and holes recombination of binary hybrid CIS/ZnS photocatalysts.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 10
·e2206619120
·
IF 11.1
Wencui Li,Zhi Li,Hang Zhang,Pengxiao Liu,Zean Xie,Weiyu Song,Baijun Liu,Zhen Zhao
Selective oxidation of methane to organic oxygenates over metal–organic frameworks (MOFs) catalysts at low temperature is a challenging topic in the field of C1 chemistry because of the inferior stability of MOFs. Modifying the surface of Cu-BTC via hydrophobic polydimethylsiloxane (PDMS) at 235 °C under vacuum not only can dramatically improve its catalytic cycle stability in a liquid phase but also generate coordinatively unsaturated Cu(I) sites, which significantly enhances the catalytic activity of Cu-BTC catalyst. The results of spectroscopy characterizations and theoretical calculation proved that the coordinatively unsaturated Cu(I) sites made H2O2 dissociative into •OH, which formed Cu(II)-O active species by combining with coordinatively unsaturated Cu(I) sites for activating the C−H bond of methane. The high productivity of C1 oxygenates (CH3OH and CH3OOH) of 10.67 mmol gcat.−1h−1 with super high selectivity of 99.6% to C1 oxygenates was achieved over Cu-BTC-P-235 catalyst, and the catalyst possessed excellent reusability.
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