POLYMER
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2022
·
IF 4.432
Hongyu Jiang,Hong Zhang,Yaqing Wen,Liyun Tan,Xingzhong Fang,Guofei Chen
Mixed isopropylidenebis(1,4-phenylene-oxy) bis(phthalic anhydride)s with different ratios ( Mixed-BPADA 1-3 ) were synthesized successfully via aromatic nucleophilic substitution from nitrophthalonitrile and bisphenol A. The corresponding copolyetherimides (CoPEIs) were prepared with two representative aromatic diamines (4,4′-oxydianiline (4,4′-ODA) and m -phenylenediamine ( m -PDA)) via two-step procedure and chemical imidization. CoPEIs showed T g s from 222 to 256 °C and T d5% s from 486 to 505 °C in argon, good mechanical properties (tensile moduli of 2.5–2.9 GPa, tensile strengths of 69–96 MPa, and elongations at break of 3.3–6.3%), and good solubility. With the introduction of 3-substituted phthalimide unit, CoPEIs displayed higher T g values, lower elongations, better solubility and larger d -spacings. The rheological properties of thermoplastic polyimide resins based on the Mixed-BPADA were investigated. CoPEI-b series displayed good melt processibility, and the CoPEI-3b derived from Mixed-BPADA 3 and m -PDA had the lowest melt viscosity among the copolymers . Compared to isomeric PEIs derived from BPADA isomers, CoPEIs displayed lower melt viscosities, indicating that the melt processibility had been greatly improved.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Qian Zhu,Huiqin Gao,Yiwei Sun,Yujia Xiang,Xiangjing Liang,Andrei Ivanets,Xiaoqin Li,Xintai Su,Zhang Lin
The synergistic effect of heteroatoms is a viable method to enhance the adsorption performance of heavy metal onto carbon-based materials. However, the high cost, complex operation and a lot of pollution from the synthesis process have limited its development. Herein, a facile two-step pyrolysis method is used to prepare in situ N and S doped porous biochar from paper mill sludge for the removal of Cr(VI) from aqueous environment. The NSC-450 sample prepared under the optimum conditions has a large specific surface area of 3336.7 m 2 g −1 , an average pore size of 2.56 nm and a total pore volume of 2.10 cm 3 g −1 , manifesting the excellent adsorption capacity of 356.25 mg g −1 for Cr(VI). The adsorption of Cr(VI) by NSC-450 is consistent with the Langmuir isotherm and pseudo-second-order model, suggesting a spontaneous and endothermic chemisorption process. The analysis results show that the NH, graphitic nitrogen and thiophene structures have a positive effect on converting a large amount of Cr(VI) to Cr(III) by synergistic reduction, indicating obviously facilitating Cr(VI) removal compared to other sites. Therefore, in this material, the strong adsorption mechanism is mainly reductive complexation. Moreover, the effects of real water quality, anions, cations and fulvic acid on the adsorption behavior of Cr(VI) onto the NSC-450 were further investigated. The results demonstrate that the chromium removal rate remains above 82% even in actual electroplating wastewater, suggesting NSC-450 has great practical application prospect. This work offered a feasible method for high-value utilization of sludge, but also provided a novel perspective for the future design of heteroatom-doped carbon materials for promoting to eliminate hexavalent chromium from water environment.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2022
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IF 5.895
Hang-Zhi Zhu,Shan Jiang,Jun-Jie Wu,Xue-Rong Zhou,Peng-Yang Liu,Feng-Hong Huang,Xia Wan
Astaxanthin is a highly value-added keto-carotenoid compound. The astaxanthin 3S,3′S-isomer is more desirable for food additives, cosmetics, and pharmaceuticals due to health concerns about chemically synthesized counterparts with a mixture of three isomers. Biosynthesis of 3S,3′S-astaxanthin suffers from limited content and productivity. We engineered Yarrowia lipolytica to produce high levels of 3S,3′S-astaxanthin. We first assessed various β-carotene ketolases (CrtW) and β-carotene hydroxylases (CrtZ) from two algae and a plant. HpCrtW and HpCrtZ from Haematococcus pluvialis exhibited the strongest activity in converting β-carotene into astaxanthin in Y. lipolytica. We then fine-tuned the HpCrtW and HpCrtZ transcriptional expression by increasing the rounds of gene integration into the genome and applied a modular enzyme assembly of HpCrtW and HpCrtZ simultaneously. Next, we rescued leucine biosynthesis in the engineered Y. lipolytica, leading to a five-fold increase in biomass. The astaxanthin production achieved from these strategies was 3.3 g/L or 41.3 mg/g dry cell weight under fed-batch conditions, which is the highest level reported in microbial chassis to date. This study provides the potential for industrial production of 3S,3′S-astaxanthin, and this strategy empowers us to build a sustainable biorefinery platform for generating other value-added carotenoids in the future.
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ENERGY & FUELS
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2022
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IF 4.654
Cheng Lan,Heping Xie,Yifan Wu,Bin Chen,Tao Liu
Electrochemical seawater splitting using efficient HER (hydrogen evolution reaction) and OER (oxygen evolution reaction) electrocatalysts have become an appropriate method for the mass production of green hydrogen. In this study, a noble-metal free OER electrocatalyst consisting of Mo-doped Ni3S2 nanocluster arrays on Nickle foam (Mo–Ni3S2/NF)─fabricated using a modified one-step solvothermal approach─is developed and evaluated. The proposed electrocatalyst demonstrates exceptional OER activity, requiring overpotentials of only 212 and 291 mV to deliver OER current densities of 10 and 100 mA cm–2, respectively, in alkaline seawater. The presence of Mo promotes Ni–S coordination, resulting in strong electronic interactions and substantially enhanced OER kinetics. Meanwhile, surface sulfate ions and (oxy)hydroxide (NiOOH) generated during the OER lead to enhanced activity and corrosion resistance, enabling Mo–Ni3S2/NF to operate continuously at 100 mA cm–2 for 500 h in alkaline natural seawater. This study is expected to inform the progression of sulfur-based transition-metal electrocatalysts for seawater oxidation.
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Zhijia Zhang,Yuanyuan Yang,Wei Guo,Ganggang Chang,Junsheng Li
Lithium–sulfur (Li–S) batteries are considered promising next-generation energy storage systems due to their high energy density and low cost. However, their practical application still faces challenges such as the “shuttle effect” caused by polysulfides (LiPS). In this work, we use environmentally friendly bacterial cellulose (BC) as the substrate and prepare a flexible Ni-containing coordination polymer-modified carbonized BC interlayer (Ni-CBC). The combined electrochemical theoretical analysis shows that Ni-CBC not only captures LiPS effectively but also facilitates the electrochemical conversion of the adsorbed LiPS. As a result of these favorable features, the battery with the Ni-CBC interlayer delivers a stable discharge performance at 0.2C during long charge–discharge cycles and a high rate capacity of 852 mAh g–1 at 2C. This work suggests that cellulose-based materials with tailored functionality can improve the performance of Li–S batteries.
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Solar RRL
·
2022
·Vol. 6
·期 6
·2101032
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IF 9.173
Junjie Fu,Qingwen Tian,Yachao Du,Qianqian Chang,Yanping Guo,Shengjie Yuan,Zhi Zheng,Sixin Wu,Shengzhong (Frank) Liu
The photovoltaic performance of the kesterite Cu 2 ZnSn(S,Se) 4 solar cells is still far below its predecessor CuInGaSe 2 . One major reason is its severe interface nonradiative recombination at the mismatched Cu 2 ZnSn(S,Se) 4 /CdS heterojunction interface, leading to a large open-circuit voltage loss. Herein, a distinctive indium-incorporation (DI) strategy is developed to deposit an In 1− x Cd x S buffer layer for optimizing the heterojunction interface. The results reveal that adopting this DI method can effectively inhibit the formation of an undesirable secondary phase, and indium can be more easily doped into the bulk lattice of CdS to form additional beneficial shallow donor In Cd defects, which significantly improve the electrical properties of the CdS layer and the quality of the heterojunction interface. Besides, the energy band alignment is adjusted to facilitate the extraction and transfer of interfacial charges, and thus reducing the nonradiative charge recombination at the front Cu 2 ZnSn(S,Se) 4 /CdS heterojunction interface. Consequently, the combination of the above enhances the power conversion efficiency from 10.2% to 12.4%, one of the highest for this type of cells, which corresponds to an open-circuit voltage deficit ( V oc,def ) reduction to as low as 0.54 V. The strategy provides a rational design for optimizing the heterojunction interface of Cu 2 ZnSn(S,Se) 4 solar cells to reduce voltage loss and achieve high efficiency.
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ELECTROCHIMICA ACTA
·
2022
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IF 7.336
Ningxiang Wu,Xiao Gu,Shuhao Zhou,Xu Han,Huitao Leng,Panpan Zhang,Pan Yang,Ying Qi,Sheng Li,Jingxia Qiu
Membrane capacitive deionization (MCDI) technology is a promising water quality desalination technology. It is reasonably necessary to find suitable electrode materials with unique properties for high desalination performance. Herein, fish scales (FSs) are selected as precursors for obtaining carbon materials with a hierarchical porous structure with the contributions from hydroxyapatites (HAs) templates, which are naturally contained in the FSs. The characterizations of the derived carbon show that it possesses an ultra-high specific surface area of 3,761.71 m 2 g −1 , a lot of micro/mesopores, natural heteroatomic doping sites and excellent wettability. As a result, it shows an excellent desalination capacity of 29.14 mg g −1 and good electrode regeneration performance, proving that the fish scales-derived carbon is promising for MCDI application.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Wei Xie,Qingfeng Zhang,Shuai Song,Xueli Cheng,Ying Yang,Longlu Wang,Xiaoping Ouyang,Shuhong Xie,Jianyu Huang
Anode materials with excellent rate capability, capacity, and cycle life have been a challenge in obtaining cost-effective K-ion batteries (KIBs). Based on the concept of waste recycling, we prepared the S-doped (21.5%) amorphous carbon/carbon quantum dots coupled micro-frame (SCMF) by combining chemical exfoliation and S/Se-assisted carbonization. SCMF exhibited the advantages of integrating amorphous carbon and carbon quantum dots (CQDs). The CQDs serve as fast electron channels, while amorphous carbon can accommodate more large-size K-ions and mitigate volume expansion. In KIBs, SCMF maintained a high reversible capacity (414.0 mAh g −1 , after 100 cycles at 100 mA g −1 ), a good rate capability (224.0 mAh g −1 , 2000 mA g −1 ), and excellent capacity retention (208.9 mAh g −1 , after 2000 cycles at 1000 mA g −1 ). The molecular dynamic simulation revealed that CQDs provided fast electron transport channels and that C, O and S atoms had suitable interactions with K, facilitating potassium storage. Moreover, the potassium-ion capacitor (PIC) assembled from SCMF and activated carbon exhibited stable electrochemical performance, proving its potential for application. The research provided valuable insights into the reuse of biomass waste in new secondary batteries.
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Sustainable Materials and Technologies
·
2023
·
IF 9.6
Dandan Ouyang,Liuqian Yang,Ya-nan Wang,Yongsheng Li,Feng Yu,Jiao Yin
Carbon materials have great potential in achieving excellent potassium-ion batteries (PIBs), while the low theoretical capacity of carbon materials limits the application of potassium ion batteries . Here, we reported an amorphous porous carbon with rich N-S bonds (N-S/C) by simple self-assembly possess and pyrolysis possess. The prepared N-S/C material possesses plentiful N-S bonds, which can act as active center to enhance the electrochemical capacity and accelerate transport dynamics. In addition, abundant porous structure can increase the contact area between electrode materials and electrolyte to shortens the diffusion path of ion transport, thereby improving the rate performance. As PIBs anodes, the N-S/C material exhibits a markedly enhanced reversible capacity of 389 mAh g −1 at 50 mA g −1 , excellent cycling stability (188.8 mAh g −1 at 500 mA g −1 after 1000 cycles) and rate performance (105 mAh g −1 at 2 A g −1 ). Importantly, the in-situ Raman unravels a reversible mechanism that intercalation/deintercalation of K + into/from the N-S/C, and the electrochemical analysis shows the N-S bond can improve the capacitive activity and enable fast kinetics toward superior K + -storage. These results demonstrate a promising carbonaceous anode material for PIBs and may provide guidance for designing of electrode materials of PIBs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zhiliang Jin,Teng Li,Kai Wang,Xin Guo
Simple high-temperature calcination and hydrothermal methods were followed to synthesize CeO 2 and Mo-S, respectively. The efficient photocatalytic hydrogen evolution activity exhibited by the composite catalysts can be attributed to the edge active sites in Mo-S. The Mo-O bonds formed between CeO 2 and Mo-S could further accelerate the processes of separation and migration of electrons between the catalyst interfaces. The hybrid catalyst 10%-CeO 2 /Mo-S exhibiting the best hydrogen generation ability (4.3 mmol h −1 g −1 ) was obtained by optimizing the content of CeO 2 in CeO 2 /Mo-S. Analysis of the PL spectral profile and photocurrent response recorded for the system revealed that 10%-COMS exhibited excellent photogenerated carrier separation ability. Analysis of the LSV and EIS curves revealed that 10%-COMS exhibited the optimal hydrogen production potential. The charge migration resistance provided by the systems was lower than the charge migration resistance provided by CeO 2 and Mo-S. The synergism between the S-scheme heterojunctions and the Mo-O bonds helped accelerate the separation and migration of photo-induced carriers at the catalyst interfaces. The introduction of covalent bonds in the S-scheme heterojunctions and the results presented herein can potentially help develop a new method to realize photocatalytic hydrogen evolution.
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CHEMOSPHERE
·
2023
·
IF 8.8
Kexue Liu,Chunliu Liang,Huijuan Lv,Xiangfeng Yao,Xianxu Li,Jia Ding,Na Chen,Suo Wang,Wenrong Liu,Xue Hu,Jun Wang,Huanshun Yin
As a kind of plasticizer , butyl benzyl phthalate (BBP) presents a serious hazard to the ecosystem. Therefore, there is a strong need for an effective technique to eliminate the risk of BBP. In this work, a new photocatalyst of Bi/Bi 2 O 2 CO 3 /Bi 2 S 3 with an S-scheme heterojunction was synthesized using Bi(NO 3 ) 3 as the Bi source, Na 2 S as the S source, and DMF as the carbon source and reductant. Numerous techniques have been used to characterize Bi/Bi 2 O 2 CO 3 /Bi 2 S 3, such as scanning electron microscopy, high-resolution transmission electron microscopy , X-ray diffraction, and X-ray photoelectron spectroscopy. The improved photoactivity of Bi/Bi 2 O 2 CO 3 /Bi 2 S 3 was evaluated by photoelectrochemical response, electrochemical impedance spectroscopy, photoluminescence , UV–Vis diffuse reflectance spectroscopy, and electrochemical Mott Schottky spectroscopy. The enhanced photocatalytic activity of this composite for BBP degradation under simulated sunlight irradiation could be attributed to the surface plasmon resonance effect of Bi metal and the heterojunction structure of Bi 2 O 2 CO 3 and Bi 2 S 3 . The degradation rate of Bi/Bi 2 O 2 CO 3 /Bi 2 S 3 was 85%, which was 4.52 and 1.52 times that of Bi 2 O 2 CO 3 and Bi 2 S 3 , respectively. The prepared photocatalyst possessed good stability and reproducibility in eliminating BBP. The improved photocatalytic activity of Bi/Bi 2 O 2 CO 3 /Bi 2 S 3 was demonstrated with the formation of an S-scheme heterojunction, and the degradation mechanism was discussed with a liquid chromatograph mass spectrometer .
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Nanoscale Advances
·
2023
·Vol. 6
·期 2
·722-731
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IF 4.7
Jiaxi Wang,Wenting Chen,Lei Cao,Mengyan Zhou,Yongkang Geng,Yifei Liu,Shushu Ding,Ding-Yi Fu
Hereby, facile-green copper nanoclusters templated by glutathione S-transferase (GST-CuNCs) have been innovatively synthesized via a simple one-pot stirring method at room temperature. The as-prepared nanoclusters exhibited uniform size with satisfactory fluorescence intensity, good stability and low cytotoxicity. Significantly, the fluorescence of the obtained GST-CuNCs could be considerably enhanced by the addition of chlorotetracycline (CTC) rather than other analogues of CTC, which was ascribed to the aggregation-induced enhancement caused by the interaction between CTC and GST. The enhanced fluorescence intensity demonstrated a good linear correlation with the CTC concentration in the range of 30–120 μM (R2 = 0.99517), and the low detection limit was 69.7 nM. Furthermore, the proposed approach showed favorable selectivity and anti-interference toward CTC among prevalent ions and amino acids. Additionally, this nanoprobe was also applied to the quantitative detection of CTC in serum samples with satisfactory outcomes, which demonstrated excellent prospects for practical applications.
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