Nanoscale
·
2021
·Vol. 13
·期 47
·20281-20288
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IF 7.79
Xintong Li,Yizhe Liu,Qidi Sun,Wei-Hsiang Huang,Zilong Wang,Chu-Chen Chueh,Chi-Liang Chen,Zonglong Zhu
In the electrochemical water splitting process, integrating hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte with the same catalyst is highly beneficial for increasing the energy efficiency and reducing the fabrication cost. However, most OER catalysts are unstable in the acidic solution, while HER shows poor kinetics in the alkaline solution, which hinders the scale-up application of electro-catalytic water splitting. In this work, a CoP/Co3O4 heterostructure is firstly fabricated and then O and P defects are introduced via surface engineering (s-CoP/Co3O4). The as-prepared material was employed as the catalyst towards electrochemical water splitting in an alkaline environment. In alkaline HER, a current density of −10 mA cm−2 can be achieved at an overpotential of 106 mV vs. RHE. In the OER process, the overpotential of s-CoP/Co3O4 electrode is only 211 mV vs. RHE at 10 mA cm−2 in 1 M KOH, and the corresponding Tafel slope is only 58.4 mV dec−1 so that the s-CoP/Co3O4 electrode could be used as the bifunctional catalyst for alkaline water splitting. This work provides a simple and low-cost approach to fabricate a Co-based heterojunction electrode with unsaturated metal sites to improve the electro-catalytic activities towards water splitting.
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CERAMICS INTERNATIONAL
·
2021
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IF 4.527
Yucheng Chen,Lichun Cheng,Tianrui Xia,Man Wang,Huaiying Zhou,Qingrong Yao,Yuhang Zhai
Bi x Ba 1- x Fe 12 O 19 (Bi–BFO, x = 0, 0.1, 0.2, 0.3, 0.4) absorbing materials were successfully prepared employing the sol-gel method. In this study, the effects of Bi introduction on the phase structure, microstructure, magnetic properties , and wave absorption properties of the materials were investigated in detail. The introduction of Bi enhances the dielectric properties and electrical conductivity of the material, which improves charge and dipole polarization. Elemental doping changes the microstructure of the sample, which leads to interface and defect polarization and improves the wave absorption performance of the material. At the same time, Bi doping allows for the calcination temperature to be lowered and increases the density of the material, which renders the material amenable to low-temperature preparation. The absorbing material has a variety of loss forms, with the maximum reflection loss being −43.6 dB when the thickness is 2.4 mm, and the reflection peak shifts to lower frequencies with increasing Bi content. The effective absorption bandwidth (RL < −10 dB) is 6.3 GHz in the range of 9–15.3 GHz. Compared with multi-element doping and multi-component composites, the preparation method of the absorbing material is simple and facile. Compared with the existing ferrite materials, this material has broader applicability in various fields as it can absorb a wider bandwidth.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2020
·Vol. 104
·期 23
·10005-10018
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IF 3.53
Guo Xiaolei,Wu Weibin,Zhang Mingliang,Wu Licheng,Huang Jianzhong
Abstract l -Tyrosine is a versatile compound used in the fine chemical, pharmaceutical, and functional food industries. Here, we report a bi-enzymatic cascade involving alanine racemase (ALR) and d -amino acid oxidase (DAAO) to produce pyruvate, as co-substrate for l -tyrosine production, from the cheap substrate l -alanine. The BpALR (ALR from Bacillus pseudofirmus ) was used as a whole-cell biocatalyst, converting l -alanine to d , l -alanine. The FsDAAO (DAAO from Fusarium solani ) was immobilized to oxidize the d -alanine generated in the first step to pyruvate. Both systems were combined as a continuous-flow reactor for maximized l -alanine-to-pyruvate conversion rates. The optimal parameters and appropriate conditions for FsDAAO immobilization were investigated. The pyruvate concentration of 86.6 g/L was achieved within 17 h. Subsequently, a whole-cell biocatalyst system for l -tyrosine production, catalyzed by the tyrosine phenol-lyase (TPL) from Erwinia herbicola (EhTPL), was developed, and a fed-batch approach was applied with phenol and the pyruvate produced with the ALR/DAAO system mentioned above. The concentration of phenol and pyruvate in the reactor should not exceed 7.5 g/L and 10 g/L, respectively. Significantly, the l -tyrosine concentration of 152.5 g/L was achieved within 10 h, demonstrating the great potential for high-efficiency production of l -tyrosine through the approach we established in this paper. Graphical abstract Key points • A specific bioreactor system for pyruvate produced from l -alanine was developed • The appropriate condition for immobilization of FsDAAO was investigated • A fed-batch process was established to produce l -tyrosine with recombinant E. coli • The bi-enzymatic cascade was successfully used for l -tyrosine production at low cost
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JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Ankang Xiao,Xiansong Shi,Zhe Zhang,Congcong Yin,Sen Xiong,Yong Wang
Processing two-dimensional (2D) covalent organic frameworks (COFs) into nanofilms has gained widespread attention in water treatment. However, the designed synthesis of COF-based membranes for ion separations still remains a huge challenge though the strategies to produce COF molecular separation membranes have been greatly developed. Herein, we report the construction of bi-layered COF nanofilms for efficient desalination through a simple yet effective secondary growth. The suggested strategy is capable of easily regulating the growth of another COF layer on the pre-synthesized first layer, thus producing crystalline and defect-free bi-layered COF nanofilms with distinct laminated structures. Most importantly, the offset channels are involved at the interface of two nanofilms obtained from the first and secondary growth, which leads to a constricted effective aperture that significantly enhances the ion separation performance. Specifically, the bi-layered COF nanofilms composited with macroporous supports exhibit high rejection rates (~95.8%) to Na 2 SO 4 , observably surpassing the desalination performance of single-layered COF nanofilms (rejection<10%). This work not only develops an ingenious way to fabricate COF-on-COF nanofilms with narrowed channels by tailoring the laminated structure of 2D COFs at the film interface, but also starts an avenue for the adoption of COF platforms for membrane separations with an improved precision.
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CHEMOSPHERE
·
2020
·
IF 5.778
Xiaotong Gu,Ning Qin,Guangfeng Wei,Yiqiong Hu,Ya-nan Zhang,Guohua Zhao
It is stubborn to remove the lowly concentrated phthalic acid esters (PAEs) that usually coexist with other highly concentrated but low-toxic pollutants in municipal sewage. Herein, we report a novel strategy for completely removing the PAEs over a bi-functional {001}TiO 2 surface (with highly exposed {001} facet), which not only serve as functional sites to specifically adsorb the target PAEs pollutants, but also contribute to an enhanced oxidation ability. The adsorption behavior of PAEs on {001}TiO 2 is analyzed deeply through kinetic experiments combining with in situ ATR-FTIR spectroscopy and theoretical calculations. The results reveal that the adsorption capacities of PAEs on {001}TiO 2 are about 4–5 times higher than that on TiO 2 , both of which follow the pseudo-second-order and Langmuir model. This is mainly attributed to the interfacial Lewis Acid-Base Pair between {001} facet Ti 5c sites and C O of PAEs. Benefitting from the specific adsorption capability toward target pollutant and enhanced oxidation ability of {001} facets, nearly 100% of DMP or DEP in simulated wastewater can be eliminated by {001}TiO 2 within 2 h illumination, and the relevant degradation rate constants ( k ) (3.67 h −1 for DMP and 2.19 h −1 for DEP) are 5.73 and 3.08 folds higher than that of pure TiO 2 , respectively. In the application of municipal wastewater , nearly 76% of DMP and 85% DEP can be eliminated by {001}TiO 2 within 2 h illumination, which are nearly 3–6 fold higher than that of pure TiO 2 .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yan Xu,Zhenbo Wang,Caifeng Ding,Xiliang Luo
It is a great challenge to detect the target selectively and accurately in complex biological samples. A ratiometric signal amplification strategy based on antifouling peptide is proposed to detect thrombin (TB) in this work. The electrode is modified with conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) and [email protected] Then the bi-functional peptide anchors to the modified electrode and captures the low toxic electrochemiluminescence (ECL) probe. The bi-functional peptide includes a new antifouling sequence (DRDRDRDR) and a TB recognizable sequence (SGRPVLG), while the former can greatly reduce the non-specific adsorption in complex samples and the latter can be cleaved by TB. The new self-enhanced luminescence probe labeled as PAMAM-QDs is composed of low toxic and water-soluble CuInZnS/ZnS quantum dots (CIZS/ZnS QDs) and polyamidoamine (PAMAM) via amide bonds. Concentration of TB can be obtained via the ratio of the signals of ECL QDs /ECL [email protected] accurately and sensitively. The ECL biosensor with the detection line 1.82 fM can work from 10 fM to 1 nM. Thanks to the antifouling property of the designed peptide and the amplification of the new ECL probe, the biosensor can be used for quantifying TB in practical complex samples with high selectivity and sensitivity.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yutong Duan,Xianjia Peng,Xingyun Hu
Vanadium is a kind of heavy metal pollutant listed as priority control by various countries, but it is also a strategic valuable metal. The current treatment of vanadium-containing wastewater suffers from the waste of vanadium resources and produces large volumes of hazardous wastes . An innovative approach was proposed to address these problems. The method involved selectively recovering vanadium from wastewater using Bi 2 O 3 and preparing Bi-V photocatalyst in situ. By optimizing the conditions, the recovery efficiency of pentavalent vanadium (V(V)) was 99.6%. The recovered product was determined to be 1.14*Bi 2 O 3 @BiVO 4 , and it was proved to be a heterojunction structure by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The band gap was calculated to be 2.32 eV by UV–vis analysis. Under visible light, the degradation rate and efficiency of AO7 by 1.14*Bi 2 O 3 @BiVO 4 was 0.906 h −1 and 84.86%, respectively. The degradation pathway of AO7 was also revealed. The improved photocatalytic performance of the Bi 2 O 3 @BiVO 4 could be attributed to the p-n heterojunction, excitating ·O 2 − and ·OH under visible light. Thus, this method solved the problem of both vanadium discharge in wastewater and the difficulty of vanadium resource utilization, and had practical utilization value.
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OPTICS AND LASERS IN ENGINEERING
·
2023
·
IF 4.6
Yongping Li,Ziyi Luo,Yiwan Song,Xiaoyu Weng,Yiping Wang,Liwei Liu,Jun Song,Junle Qu,Xiao Peng,Yufeng Yuan
Recently two-dimensional (2D) nanomaterials-mediated photothermal therapy (PTT) has become an important tool for treating cancer. However, visually monitoring the localization of nanoagents in cancer cells remains a key challenge. Herein, exploring high photostability, and high biocompatibility probes for monitoring PTT are still highly desirable. In this study, a novel optical probe named PEG@ReSe 2 nanosheets (polyethylene glycol, PEG; rhenium diselenide, ReSe 2 ) was prepared and employed to perform in vivo two-photon imaging for monitoring PTT in esophageal cancer cells. Under the illumination of a near-infrared (NIR) femtosecond laser at 820 nm with the output power as low as 5 mW, the PEG@ReSe 2 nanosheets showed significant two-photon features, producing a significant photoluminescence emission band at 637 nm. In addition, the prepared PEG@ReSe 2 nanosheets exhibited high resistance to photobleaching. Also, the PEG@ReSe 2 nanosheets showed low cytotoxicity for cancer cells, providing a high viability of more than 90%. More importantly, the PEG@ReSe 2 nanosheets could enter cancer cells and work as a two-photon probe for visually displaying the PTT process. After 12 h incubation, the PEG@ReSe 2 nanosheets produced strong two-photon signals in KYSE150 cancer cells, enabling them to perform in vivo bi-channel bioimaging. In light of its photothermal effects, the PEG@ReSe 2 nanosheets also could serve as a sensor for monitoring PTT under low-power infrared laser irradiation. This study suggests that, the PEG@ReSe 2 nanosheets could serve as a superior two-photon biosensor for monitoring the PTT process in cancer nanomedicine.
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Surfaces and Interfaces
·
2023
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IF 6.2
Yue Shen,Haoyang Xu,Yage Zheng,Yao Wang,Liang Zhang,Zhiqiang Zhang,Lvling Zhong,Zhixian He
The development of a low-cost and recyclable method for wastewater treatment has been a major challenge. Polyvinylidene fluoride (PVDF) membranes have received considerable attention owing to their excellent mechanical strength , unique antioxidant properties, and low cost. In this study, Bi/BiOCOOH/PVDF composite membrane materials were prepared using a simple two-step solvent thermal method and phase conversion method. The results showed that under the synergistic action of adsorption and photocatalysis , the photocatalytic degradation efficiency of Bi/BiOCOOH composite material and Bi/BiOCOOH/PVDF composite membrane material for ciprofloxacin (CIP) was much higher than that of BiOCOOH. The introduction of PVDF acted as a carrier, improved the adsorption of the catalytic material to CIP, and facilitated the effective collision of the photocatalytic active site and CIP. The experimental results and theoretical calculations confirmed that the combination of Bi and BiOCOOH effectively improved the light absorption capacity and photocatalytic performance. The reproducibility test revealed that the small amount of new composite catalyst for Bi/BiOCOOH/PVDF as a carrier was lost and that the Bi/BiOCOOH/PVDF catalyst still had high catalytic activity. In addition, the influence of water matrix factors, such as pH and anion, on the photocatalytic degradation experiment was investigated, which would provide some reference for the actual wastewater treatment of the composite catalyst. This study demonstrates a photocatalytic activation mechanism between metals and semiconductors and provides some basis for constructing catalysts for the synergistic and effective treatment of water pollution through a combined adsorption and photocatalysis process.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
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IF 4.2
Dongcheng Bai,Zhengtao Wei,Xueqing Qiu,Xuliang Lin
Organic contaminants have become a major concern in current environmental policies. Biochar is often used to absorb pollutants due to its large surface area, wide availability, and cost-effectiveness. Lignin, a byproduct of the pulp and paper industry, is an ideal precursor for biochar due to its abundance, sustainability, and high carbon content. Bi-activation engineering of alkali lignin during the carbonized process by combining potassium carbonate and melamine to produce porous carbon with more micro–mesoporous structure was proposed. Melamine reacts with the carbon matrix during the activation process, creating new alkaline compounds and releasing more gas, resulting in the formation of more micropores and mesopores. Adjusting the ratio of potassium carbonate to melamine can optimize the micro–mesoporous structure of porous carbon materials. In this regard, a nitrogen-doped three-dimensional porous carbon (ALNC-2-1) with a specific surface area of up to 3522 m2 g–1 was synthesized for the adsorption of methylene blue and tetracycline hydrochloride in wastewater; the largest adsorption capacities were 1364 and 1682 mg g–1, respectively. The adsorption process was found to follow the pseudo-second-order kinetic model and was attributed to electrostatic interaction, pore filling, hydrogen bonding, and π–π interaction. Moreover, ALNC demonstrated high removal rates for organic pollutants and excellent regeneration performance, thus making it a promising material for practical wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Shiyu Sun,Xin Huang,Jingtao Bi,Na Wang,Ting Wang,Lina Zhou,Li Wang,Shyam Lamichhane,Hongxun Hao
Titanate has been used to absorb heavy metal ions in wastewater. However, the selective adsorption driven by ion recognition remains a challenging task. In this paper, bidirectional layer spacing regulated titanate nanofilms were developed and the mechanism of layer spacing enhanced ion recognition was systematically studied. TEM, SEM, XRD, XPS, FTIR and BET were used to characterize and analyze the obtained titanate nanofilms, and the results showed that the adsorbent was successfully synthesized and the layer spacing of these nanofilms can be bidirectionally regulated. The adsorption kinetics and adsorption isotherm indicated a positive correlation between the layer spacing of titanate nanofilms and the ion recognition. DFT calculations and Bader program analysis were used to investigate the adsorption process of titanate nanofilms with different layer spacing. It can be concluded that the affinity between adsorbent and specific adsorbate and the electron transfer value on the titanate surface could be regulated by changing the layer spacing of titanate nanofilms, resulting in the enhanced ion recognition performance. Finally, an ion recognition mechanism was proposed based on the above experimental and calculative results.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
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IF 22.1
Yuan Teng,Jing-Hua Chen,Yu-Hua Huang,Zi-Chun Zhou,Xu-Dong Wang,Dai-Bin Kuang,Hong-Yan Chen
The construction of high-quality heterojunction with staggered band structure and close-contact interface, to satisfy both the thermodynamic and dynamic prerequisites of charge transfer, is the key to improve the charge separation of halide perovskites . The in situ growth of perovskite heterojunction via cosharing atoms provides an appealing solution to tackle this dilemma, but it remains a big challenge owing to the lack of appropriate precursors. Here, we design a novel visible-light responsive Co x Bi 2−x O 2 CO 3 nanosheet , and use it as self-template to epitaxially grow Cs 3 Bi 2 Br 9 nanosheet . It is revealed that close-contact 2D/2D heterointerfaces with strong chemical and electronic coupling are built via Bi atom bridge. Moreover, incorporating Co 3+ into Bi 2 O 2 CO 3 plays critical roles in heterojunction growth by regulating both the electronic structure and growth dynamics of Cs 3 Bi 2 Br 9 . Triggered by the effect of Co and the matched Bi lattice with Cs 3 Bi 2 Br 9 , the Co x Bi 2−x O 2 CO 3 /Cs 3 Bi 2 Br 9 heterojunction can drive the fast Z-scheme transfer and separation of photoexcited charge carriers.
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