Polymers
·
2024
·Vol. 16
·期 21
·3067
·
IF 4.7
Qianqian Li,Boxian Ruan,Yue Yu,Linshu Ye,Aoxiong Dai,Sasha You,Bingshan Zhao,Limin Ren
The removal and detection of highly toxic mercury(II) ions (Hg2+) in water used daily is essential for human health and monitoring environmental pollution. Efficient porous organic polymers (POPs) can provide a strong adsorption capacity toward heavy metal ions, although the complex synthetic process and inconvenient phase separation steps limit their application. Hence, a combination of POPs and magnetic nanomaterials was proposed and a new magnetic porous organic polymer adsorbent was fabricated by a green and mild redox reaction in the aqueous phase with trithiocyanuric acid (TA) and its sodium salts acting as reductive monomers and iodine acting as an oxidant. In the preparation steps, no additional harmful organic solvent is required and the byproducts of sodium iodine are generally considered to be non-toxic. The resulting magnetic poly(trithiocyanuric acid) polymers (MPTAPs) are highly porous, have large surface areas, are rich in sulfhydryl groups and show easy magnetic separation ability. The experimental results show that MPTAPs exhibit good adsorption affinity toward Hg2+with high selectivity, rapid adsorption kinetics (10 min), a large adsorption capacity (211 mg g−1) and wide adsorption applicability under various pH environments (pH 2~8). Additionally, MPTAPs can be reused for up to 10 cycles, and the magnetic separation step of MPTAPs is fast and convenient, reducing energy consumption compared to centrifugation and filtration steps required for non-magnetic adsorbents. These results demonstrate the promising capability of MPTAPs as superior adsorbents for effective adsorption and separation of Hg2+. Based on this, the prepared MPTAPs were adopted as magnetic solid-phase extraction (MSPE) materials for isolation of trace Hg2+from aqueous samples. Under optimized conditions, the extraction and quantification of trace Hg2+in water samples were accomplished using inductively coupled plasma mass spectrometry (ICP-MS) detection after MSPE procedures. The proposed MPTAPs-based MSPE-ICP-MS method is efficient, rapid, sensitive and selective for the determination of trace Hg2+, and was successfully employed for the accurate analysis of trace Hg2+in tap water, wastewater, lake water and river water samples.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zihan Zhong,Qingqing Shao,Baoxin Ni,Dazhi Wang,Zixi Xie,Libang Xu,Yakui Mu,Qisen Wang,Tan Wang,Yiwen Feng,Jingwei Hou,Kun Jiang,Anthony K. Cheetham,Tiesheng Wang
Controlling the nanostructure of conducting polymers (CPs) is essential for enhancing their performance in energy storage applications. Existing CPs often suffer from low effective pseudocapacitance due to poor ion permeability. In this study, we introduce a novel approach using hydrogen-bonded organic frameworks (HOFs) to synthesize porous poly(3,4-ethylenedioxythiophene) (PEDOT). We incorporated 3,4-ethylenedioxythiophene (EDOT) into HOF-16 by leveraging the flexible hydrogen-bonding interactions. Following the polymerization of EDOT, the HOF-16 was removed to form a porous interconnected network of PEDOT. Electrochemical evaluations demonstrated that the porous PEDOT exhibited significantly enhanced performance, including high specific capacitance, excellent rate capability, and ∼95% capacitance retention after 10,000 cycles. Compared to PEDOT prepared without HOF, the porous PEDOT showed a 34% increase in specific capacitance and a 10% improvement in 10,000-cycle capacitance retention. This work highlights the potential of HOF-enabled synthesis in creating high performance conducting polymers, offering a new avenue to improve supercapacitor performance, particularly in capacitance and cycling stability.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yimeng Tang,Hui Zhu,Pei Chen,Fang Liu,Yi Qin,Peng Sun,Yong Yi,Jian Zhou,Tao Duan,Jiehong Lei
Effective capture of radioactive iodine vapor is a crucial part of the spent fuel reprocessing process. In this study, humic acid (HA), which has excellent recognition capture of iodine vapor, is introduced as the active site construction center, functionalizing and modifying alkali-activated collagen fiber (ACF), to prepare the biomass composite functional materials (HA@ACF). The results demonstrate that HA@ACF exhibits exceptional recognition ability and a strong affinity for iodine vapor, with an adsorption capacity of 2811.8 mg/g (ACF is only 1068.6 mg/g). Simultaneously, under relative humidity of 27 % and strong acid conditions, the iodine vapor capture capacity of HA@ACF only decreased by 17.2 %, indicating that the material exhibits excellent iodine capture performance under complex conditions. The excellent adsorption performance is attributed to the synergistic effect of abundant −NHR, C = O, and phenolic hydroxyl active sites in HA@ACF, which recognize and induce iodine vapor, resulting in the capture of iodine molecules as I 3 - . Meanwhile, DFT calculations reveal the excellent adsorption energy (−0.51 eV) of iodine vapor on the phenolic hydroxyl groups on HA . Therefore, the HA@ACF biomass composite functional material can be an ideal candidate adsorbent for the efficient recognition capture of radioactive iodine vapor in airborne effluent.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Zhaocheng Zhang,Dongyang He,Yangjian Zhou,Edith Bai,Jiao Qu,Ya-nan Zhang
Black phosphorus nanosheets (BPNs)/CdS heterostructure was successfully synthesized via hydrothermal method . The experimental results indicated that BPNs modified the surface of CdS nanoparticles uniformly. Meanwhile, the BPNs/CdS heterostructure exhibited a distinguished high rate of photocatalytic activity for Tetrabromobisphenol A (TBBPA) degradation under visible light irradiation ( λ > 420 nm), the kinetic constant of TBBPA degradation reached 0.0261 min −1 was approximately 5.68 and 9.67 times higher than that of CdS and P25, respectively. Moreover, superoxide radical (•O 2 − ) is the main active component in the degradation process of TBBPA (the relative contribution is 91.57%). The photocatalytic mechanism and intermediates of the TBBPA was clarified, and a suitable model and pathway for the degradation of TBBPA were proposed. The results indicated that the toxicities of some intermediates were higher than the parent pollutant. This research provided an efficient approach by a novel photocatalyst for the removal of TBBPA from wastewater, and the appraisal methods for the latent risks from the intermediates were reported in this paper.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Tingting Gao,Da-Wen Sun,You Tian,Ji Ma,Fei Pan
Microwave (MW) heating shows higher efficiency in preparing wheat starch-stearic acid (WS-SA) complexes than the traditional water bath (WB) heating method, while the detailed “time-energy-quality” evaluations and the potential anti-digestion mechanism of the MW-processed WS-SA remain further exploration. In this study, 95 % time cost and 73 % energy consumption were saved when using MW processing WS-SA, and the MW-processed complexes were verified to show significantly higher relative crystallinity, short-range ordered structure degree, thermal stability, complex index, and resistant starch content. Molecular dynamics (MD) simulation demonstrated that MW treatment notably facilitated the binding rate of amylose and SA molecules, generating a tight and stable helical structure through hydrogen bonds and van der Waals forces. Analyses of solvent-accessible surface area and water status cross-verified that the denser structure could endow the MW-processed complexes with higher resistance to water solvation effects and correspondingly reduce the water mobility for enzymatic hydrolysis reactions, ultimately making the MW-processed complexes more undigestible. This study provides a further understanding of the anti-digestion mechanisms of the MW-processed WS-SA from the molecular level, and it is expected that the current work could attract more concerns to the highly cost-effective MW heating method for processing starchy food.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ling Zhang,Mengfang Li,Xuan Liu,Jiaqi Feng,Yujia Liu,Yazhu Tu,Shuyang Li,Tao Duan
The exploration of effective gaseous iodine adsorbents is an interesting and challenging task in the field of radwaste disposal. In this study, amidoxime groups (AO) were successfully grafted onto polyacrylonitrile to obtain amidoxime grafted polyacrylonitrile (PAN-AO) for capturing gaseous iodine. The results of the combined characterization analysis have confirmed that the introduction of AO greatly improved its thermostability, porosity and available functional groups of PAN. The impacts of reaction time, iodine concentration and reaction heat on the uptake capacity for gaseous iodine were systematically studied. The PAN-AO exhibited higher iodine capture capacity (1534.4 mg/g) than PAN (72.1 mg/g) at 80 °C and 600 min, which was ascribed to the chemical reaction between electron-rich AO groups and electron-deficient iodine molecules. The studies of kinetic fitting and activation energy (E a = 44.11 kJ/mol) further confirmed that chemical adsorption was the major fashion during the whole uptake process of PAN-AO for iodine. Besides, PAN-AO still had an iodine uptake capacity of 704.4 mg/g after five recycling, manifesting the remarkable cycle performance of PAN-AO. In brief, this study offered a new reference for radioactive iodine uptake and the synthesized PAN-AO was able to serve as an efficient iodine capture material.
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Small
·
2024
·Vol. 20
·期 33
·2401167
·
IF 13
Ying Lin,Changjiang Wang,Jinxiang Wu,Jian Tang,Guangmao Ye,Xiaobing Zhao,Hua Li,Yi He
Covalent organic frameworks (COFs) are promising iodine adsorbents. For improved performances, it is critical and essential to fundamentally understand the underlying mechanism. Here, using the operando dark-field optical microscopy (DFM) imaging technique, the observation of an extraordinary structure shrinkage of 2D triphenylbenzene (TPB)-dimethoxyterephthaldehyde (DMTP)-COF upon the adsorption of I 2 vapor at the single-particle resolution is reported. Combining single-particle DFM imaging with other experimental and theoretical methods, it is revealed that the shrinkage mechanism of the TPB-DMTP-COF is attributed to the I 2 sorption-induced synchronous skeleton-pore interactions. The redox reaction of I 2 and TPB-DMTP-COF yields some cationic skeletons and I 3 − species, which triggers the multi-directional halogen-bonding interactions of I 2 and I 3 − as well as strong cation-π interactions between neutral and cationic skeletons, accompanying the synchronous in-plane skeleton shrinking in the xy plane and compact out-of-plane layer packing in the z- direction. This understanding of the synchronous action between the skeleton and pore breaks the perspective on the structure robustness of 2D COFs with excellent stability during the I 2 uptake, which offers pivotal guidance for the rational design and creation of advanced microporous adsorbents.
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ULTRASONICS SONOCHEMISTRY
·
2024
·
IF 8.7
Yuheng Li,Chao Zhang,Shuyi Li,Zhenzhou Zhu,Xuehua Wang,Giancarlo Cravotto
The industrial preparation of kudzu starch (KS) significantly reduces the remaining of flavonoids like puerarin (PU) in the product, weakening its biological activity and making pre-treatments on kudzu crucial. Ultrasonic technique, widely used for modifying biomolecules, can enhance nutrient interactions like those between starch and polyphenols in foods. Thus, a puerarin-kudzu starch (PKS) complex was prepared with the introduction of ultrasonic pretreatment. The results indicated that sonication increased the binding of PU to KS from 0.399 ± 0.01 to 0.609 ± 0.05 mg/g. Particle size analysis and SEM revealed that the particles of the ultrasonic puerarin-kudzu starch complex (UPKS) were larger than those of the untreated complexes. XRD, UV–vis, and FT-IR spectroscopic analyses indicated that hydrogen bonding primarily governs the interaction between PU and KS. Additionally, incorporating PU decreased the starch structure’s orderliness, while ultrasonic treatment altered the helical configuration of straight-chain starch, leading to the formation of a new, ordered structure through the creation of new hydrogen bonds. Additionally, gels formed from UPKS exhibited higher viscosity, elasticity, and shear stress, suggesting that ultrasound significantly altered the intermolecular interactions between PKS. In conclusion, the use of ultrasound under optimal conditions has demonstrated its effectiveness in preparing PKS complexes, highlighting its significant potential to produce high value-added kudzu-based products.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Baorui Liu,Hongqing Cheng,Fangchao Cheng,Dongying Hu
Bifacial dye-sensitized solar cells (DSSCs) have the potential to address the challenge of low photoelectric conversion efficiency (PCE) in various applications. However, achieving a harmonious alignment between the counter electrode (CE) structure and its crucial properties remains a significant challenge. Herein, a lignin-induced orientation strategy was developed for poly (3,4-ethylenedioxythiophene) (PEDOT) using lignosulfonate (SL) as both a surfactant and initiator during the electrochemical deposition process. This approach enabled the successful construction of high-performance CEs for DSSCs. The resulting SL/PEDOT CEs exhibited a low disordered orientation distribution and high redox capacity, achieving a high backside light absorption of 10.7 % and a high conductivity of 104 S/m. Additionally, SL/PEDOT CEs featured excellent corrosion resistance, high electro-catalytic activity, and long service life, maintaining over 90 % of their initial efficiency after 500h. Notably, the incorporation of SL into pristine PEDOT increased the number of electron transport sites, leading to an increase in short-circuit current densities from 21.49 to 29.04 mA/cm 2 . Under one-sided and double-sided irradiation, DSSCs modified with SL/PEDOT CEs achieved higher PCE values of 9.49 % and 16.13 %, respectively, which exceeded those of numerous previously reported DSSCs. Benefiting from the matching effect between molecular/microstructure regulation and performance optimization resulting from SL-induced the orientation of PEDOT molecules, this work offers a new paradigm for the development of high-efficiency bifacial DSSCs.
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DESALINATION
·
2024
·
IF 8.3
Yidong Xiao,Hedong Chen,Minzhang Li,Qinyu He,Than Zaw Oo,Mono Zaw,Nyein Wink Lwin,Kwun Nam Hui,Min Luo,Danling Tang,Guangguo Ying,Fuming Chen
The solubility feature of redox electrolyte is a key factor to influence the performance of salt removal in redox flow electrode capacitive deionization . Herein, a novel redox flow desalination using ionic liquid (IL) as the eco-friendly solvent is proposed, i.e., 1-ethyl-3-methylimidazolium acetate. The high salt removal rate of 4.82 μg·min −1 ·cm −2 was obtained at the current density of 11 mA·cm −2 . The low energy consumption of 254.12 kJ·mol −1 was achievable in IL, compared with 466.3 kJ·mol −1 in aqueous solution and 317.86 kJ·mol −1 ethanol. In addition, a long-term test with 11 cycles was conducted, and the real seawater was desalinated to a freshwater standard in batch mode. This work is significant for development of low-energy consumption in redox flow desalination via the usage of novel ionic liquids as solvent.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 131
·期 1
·1-7
·
IF 2.5
Guo Yiming,Zhang Lei,Zhao Yong,Huang Mei,Xu Min,Zhang Yong
This research employed the powder-in-tube (PIT) method to facilitate the introduction of the non-metallic element iodine (I) into the preparation of Nb 3 Al superconducting wires. After heating in a tube furnace, a rapid heating, quenching, and transformation (RHQT) treatment was conducted. It was observed that as the quantity of iodine introduced increased, the extent of the Nb/Al reaction also rose, indicating that a certain amount of iodine can be introduced to facilitate the Nb/Al reaction, thereby enabling Nb to react more fully with Al in the subsequent process and generating a Nb 3 Al superconducting phase that is closer to the stoichiometric ratio. Wires with iodine contents of 1.0 wt%, 1.5 wt%, and 2.0 wt% exhibited a diffusion layer at the Nb/Al interface after heating in a tube furnace at 1000 °C for 30 min. The primary component of the diffusion layer was Nb 2 Al. No diffusion layer was observed in the pure sample or in the group with 0.5 wt% I. However, a eutectic phase was present at the edge of Nb and Al. The wires with 1.0 wt% and 1.5 wt% I exhibited higher critical temperatures ( T c ) of 18.236 K and 17.421 K, respectively, than the pure sample. Additionally, they demonstrated superior critical current density ( J c ) properties compared to the pure sample.
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Food Bioscience
·
2024
·
IF 4.8
Yushi Wei,Le Deng,Shuling Chen,Xing Hu,Guowen Zhang
The inhibition mechanism of starch digestion by a natural plant active ingredient isoliquiritigenin was studied. The results indicated that isoliquiritigenin effectively decreased the starch hydrolysis through increasing the content of resistant starch, and inhibiting the activities of α-amylase and α-glucosidase. The content of resistant starch increased by 18.85% with the addition of isoliquiritigenin at 8% content. Multispectral analyses showed isoliquiritigenin combined with α-amylase or α-glucosidase to form stable complexes by non-covalent bonds, leading to the enzyme's structure to be loose, which was supported by the results of unstable conformations and an increase in the freedom of amino acid residues of the enzymes in molecular dynamics simulation. Molecular docking demonstrated that isoliquiritigenin bound to the amino acid residues 304–310 nearby the active pocket of α-amylase, and inserted the active site of α-glucosidase competing with the substrate to bind the crucial amino acid residues (Asp215, Asp352 and Glu411), thereby inhibiting α-amylase and α-glucosidase activity. These findings highlight the development potential of isoliquiritigenin as a hypoglycaemic dietary supplement.
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