ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Mao Xu,Qi Tang,Yuchen Liu,Jiaqi Shi,Weiyu Zhang,Chan Guo,Qiuwen Liu,Weiwei Lei,Cheng Chen
Two-dimensional nanomaterial-based membranes have earned broad attention because of their excellent capability of separation performance in a mixture that can challenge the conventional membrane materials utilized in the organic solvent nanofiltration (OSN) field. Boron nitride (BN) nanosheet membranes have displayed superb stability and separation ability in aqueous and organic solutions compared to the widely researched analogous graphene-based membranes; nevertheless, the concentration polarization of organic dye pollutants fades their separation performance and eclipses their potential adoption as a feasible technology. Herein, PDDA-modified BN (PBN) and sodium alginate-modified BN (SBN) nanosheet membranes with a thinner laminar structure are facially fabricated to improve the molecule separation performance compared to that of the pristine BN membrane. In aqueous separation application, the SBN membranes (2 μm) can reject positively charged dyes up to 100% and the PBN membrane (2 μm) could reject negatively charged dyes up to 100%. Impressively, the PBN membranes (3 μm) and SBN membranes (3 μm) demonstrate record high performances in OSN, with a permeance of 809 L m–2 h–1 bar–1 and 97.71% rejection to acid fuchsin in acetonitrile and 290 L m–2 h–1 bar–1 and 94.94% rejection to Azure B in dimethyl sulfoxide, respectively. The charged PBN and SBN nanosheet membranes demonstrate stable separation capability, exhibiting their potential for practical water and organic solvent purification processes.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Xiuhua Sun,Shanshan Pan,Zhiren Guo,Yingxin Cui,Liang Ma,Xiaosong Yu,Taijiang Gui,Shougang Chen,Yan Liu,Changlu Gao
In this study, cationic amphiphilic copolymers of poly(hexadecyl methacrylate)-b-poly(carboxybetaine methacrylate ester) (PHMA-b-PCBMAE) with hydrophobic unit of 100 were synthesized, which can be self-assembled as core-shell nanoparticles with PCBMAE as core and PHMA as shell in chloroform . In response to the change of solvent polarity from chloroform to methanol, the reversion ability of core-shell structure occurred to cationic amphiphilic polymers of PHMA 100 -b-PCBMAE 40 , PHMA 100 -b-PCBMAE 50 , PHMA 100 -b-PCBMAE 75 and PHMA 100 -b-PCBMAE 100 in an ascending order, which was verified by 1 H NMR results. Coatings embedded with the cationic copolymers with PHMA:PCBMAE block ratios of 100:75 and 100:100 showed remarkably decreased water contact angle and protein adsorption amount due to the resulted zwitterionic copolymers upon hydrolysis in aqueous solution. Moreover, dynamic recording of the bactericidal activity against E. coli and S. aureus showed that it took ∼18 h for the copolymers PHMA 100 -b-PCBMAE 75 and PHMA 100 -b-PCBMAE 100 to take effect in bacteria killing and foulant repelling, and the bacteria left on the coating surfaces were <1.0 % in 24 h. The bactericidal results were in good accord with the trend of the nanoparticle reversion ability, indicating that higher PCBMAE contents of the cationic diblock copolymer facilitated core-shell reversion and subsequent hydrolysis to zwitterionic copolymer. Moreover, the regenerable surfaces of the coating furtherly ensured the sustainable bactericidal and antifouling activities.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Hao Zhang,Pengfei Zhang,Zhiliang Liu,Chunfang Du
In this study, various silver phosphomolybdates ( x - y - z -AgPMo) with oxygen vacancies were successfully prepared through H 2 calcination and subsequent chemical precipitation and used for the adsorption of ciprofloxacin (CIP) in water. The microstructures of x - y - z -AgPMo were analyzed by a series of characterization methods. The effects of calcination time, calcination temperature, hydrogen flow rate, and external adsorption conditions on the adsorption performance were investigated. The results showed that the adsorption performance of 1–0.1–250-AgPMo toward CIP could reach 91% within 20 min with a maximum adsorption capacity of 45.5 mg∙ g − 1 , which was about 1.7 times as that of silver phosphomolybdate (Y-AgPMo) without H 2 calcination. The improved adsorption performance of 1–0.1–250-AgPMo was mainly attributed to the presence of oxygen vacancies, which induced more negative surface charges and larger specific surface area in 1–0.1–250-AgPMo. This work provided an excellent adsorbent for CIP removal and forcefully confirmed the important role of oxygen vacancies in the adsorption process.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Boxuan Yao,Ke Zhang,Xiaoyang Liu,Hua Wei,Zihan Li,Jiarui Zhou,Guangfei Yuan,Xin Wang,Shenghong Yang,Jian Liu
Pursuing special negatively charged adsorbents is critical to selectively removing cationic pollutants from effluent. Herein, we proposed a versatile preparation strategy of negatively charged saccharide-based polymers using easily available saccharides as building blocks and hexachlorocyclotriphosphazene as a linker in a facile “one-step” method. Because of the existence of numerous hydroxyl groups and phosphine nitrile units in the skeleton, these polymers show selective adsorption capacity towards cationic dyes and pharmaceuticals, but not for ionic dyes and uncharged bisphenol A. Notably, β-cyclodextrin-based polymers (β-CDPs) displayed remarkable adsorption towards methylene blue (Q m , 1563 mg g −1 ) and promethazine (Q m , 944 mg g −1 ). Systematic experiments revealed that the synergy of “host-guest” inclusion, electrostatic attraction, and π-π interaction promoted the selective and efficient adsorption of cationic pollutants. Given the efficiently selective adsorption of cationic dyes and pharmaceuticals, these negatively charged saccharide-based polymers should be candidates for the adsorption of other cationic pollutants, including heavy metal ions. This work expanded the scope of the special utilization of biomass-based adsorbents for water remediation.
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JOURNAL OF MOLECULAR STRUCTURE
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2023
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IF 3.8
Xin Yan,Na Zhang,Zhiliang Liu,Chunfang Du
In this paper, 1T/2H mixed-phase MoS 2 /g-C 3 N 4 composites (1T/2H-MG) were successfully synthesized by a simple two-step calcination method and used for Cr(VI) removal from aqueous environment. A series of characterization methods were used to characterize the microstructure and surface morphology of the prepared materials. The experiment results showed that 1T/2H-MG (1:12) composite with good pH and temperature adaptability could completely remove Cr(VI) (100 mg∙L –1 ) within 50 min and showed an excellent adsorption capacity of 342.06 mg∙g –1 . The presence of abundant sulfur defects in 1T/2H-MG composite could provide more adsorption and reduction active sites, which was the main reason for the enhanced removal efficiency of 1T/2H-MG in comparison with pure MoS 2 and g-C 3 N 4 . This work not only contributes an excellent adsorbent for the wastewater treatment, but also provides evidences for the defects engineering.
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RSC Advances
·
2022
·Vol. 12
·期 40
·25852-25859
·
IF 4.036
Chaoqiang Ding,Yan Ren,Xinyang Liu,Jingjing Zeng,Xinping Yu,Daxiang Zhou,Yanjie Li
Discrimination and detection of sulfur dioxide residues in foods using a simple colorimetric array have been achieved. The difference maps before and after the reaction showed that the specific color fingerprint was related to the amount of sulfur dioxide. The results of principal component analysis (PCA), hierarchical clustering analysis (HCA) and linear discriminant analysis (LDA) demonstrated that the as-fabricated colorimetric sensor array have good performance for the discrimination of sulfur dioxide and other interferents, as well as different concentrations of sulfur dioxide. Moreover, the array has been successfully applied to determine the concentration of sulfur dioxide residues in real samples and revealed good accuracy, precision and repeatability.
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Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 43
·8910-8917
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IF 7.571
Yifang Gao,Yang Liu,Huilin Zhang,Wenjing Lu,Yuan Jiao,Shaomin Shuang,Chuan Dong
CD-based ratiometric fluorescence probes are of great significance for visual detection, but accomplishing this goal is still a particularly challenging task. Herein, nitrogen-doped carbon dots (NCDs) with bright yellow fluorescence were easily manufactured via a one-pot hydrothermal method for visual detection of hypochlorite (ClO−) and thiosulfate (S2O32−) under UV light irradiation. The as-prepared NCDs demonstrate favorable water solubility, excellent biocompatibility, superior optical properties and low cytotoxicity. Strikingly, the fluorescence of the NCDs could be quenched with ClO−. Based on these results, an original fluorescent nanoprobe was constructed for the highly discriminating recognition of ClO− by oxidation of the amino groups on their surface to nitro groups. The assay covered the ranges from 0.067 to 19.33 μM and 24 to 98 μM with a limit of detection (S/N = 3) of as low as 0.013 μM. Remarkably, a growing peak appears at 537 nm and the emission at 492 nm shrinks with the introduction of S2O32−, which demonstrates ratiometric fluorescence emission characteristics (F537nm/F492nm) in the range of 6.6–100 μM with a limit of detection (S/N = 3) of as low as 0.78 μM. In addition, the fluorescence color of the NCDs also changes (yellow-green-blue) after adding various ClO− concentrations. The fluorescence color of the NCDs–ClO− also changes (blue-green-yellow) after adding various S2O32− concentrations. This excellent ratiometric fluorescence probe was successfully further used for nuclear imaging. Accordingly, an easy-to-prepare paper-based sensor to identify ClO− and S2O32− was fabricated, which demonstrated their adaptability for in situ on-site testing. This research further opens up new opportunities for the development of efficient yellow fluorescent probes based on NCDs nanomaterials for visual detection, biomarking, and biomedical optical imaging.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Hao Zhang,Min Li,Zhiliang Liu,Xiangchao Zhang,Chunfang Du
Two Keggin-type polyoxometalates ammonium phosphomolybdate (NH 4 -PMo) and ammonium phosphotungstate (NH 4 -PW) were simply synthesized and used as adsorbents for removing various antibiotics and heavy metals from water system. The effects of adsorbent dosage, initial concentration of pollutants, temperature and pH value on the adsorption efficiencies of tetracycline (TC) and Ni 2+ over both NH 4 -PMo and NH 4 -PW were systematically investigated. The adsorption process of TC molecules can be described by the Langmuir isothermal adsorption model. In terms of kinetic model, the adsorption process of TC can be described by the pseudo first-order kinetics for NH 4 -PMo and pseudo second-order kinetic model for NH 4 -PW. The results of adsorption experiments pointed out that the adsorption efficiency of NH 4 -PMo was higher than that of NH 4 -PW toward various antibiotics, dyes and heavy metals. The more negative surface charges and higher specific surface area contributed to the superior adsorption efficiency of NH 4 -PMo.
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JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Jingxian Zheng,Rui Wang,Qisheng Ye,Baoliang Chen,Xiaoying Zhu
Precise interlayer spacing control and stability improvement had been two main challenges for preparation of high performance multilayered graphene based membrane (MGM). In this study, UV irradiation was adopted to precisely regulate and stabilize the interlayer spacing of a nanofiltration MGM. The UV irradiation on the GO suspension would homogenously and precisely tune the content of the oxygen containing groups on the rGO nanosheets , which should be responsible for uniformly formed interlayer spacing of MGM after assembly. The actual pore size of MGM was estimated through the probability density function model, which was highly uniform and logarithmically decreasing with the increasing UV reduction time. Owing to the uniformly and precisely (in sub-nanometer scale) controlled pore size of MGM, two molecules with a very low molecular weight difference at about 130 Da were completely separated by the MGM prepared from rGO reduced by UV for 8 h. The in-situ AFM nanoindentation as well as the long-term filtration test proved the stability of MGM was dramatically enhanced through the UV reduction and could ensure the practical applications of MGM. This study proposed a facial and scalable protocol to prepare high separation resolution multilayered graphene based NF membrane, which indicated great potential for separation of molecules with very close molecular weights in practical.
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JOURNAL OF CHEMICAL EDUCATION
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2023
·
IF 3
Yongwu He,Mo Chen,Jing Wang,Gaomei Zhao,Songling Han,Yang Xu,Yin Chen,Cheng Wang,Junping Wang
The dangers of organic dye pollutants and environmental pollution improvement through photocatalytic degradation are important courses in applied chemistry programs in universities. Zinc oxide (ZnO)-based nanomaterials are potent catalytic agents against organic dyes, but few experiments are available for students to understand their role and mechanism in class. Herein, we designed a comprehensive experiment across 24 class hours for undergraduates to investigate the photodegradation of colored organic dyes, including methylene blue, methyl orange, methyl violet, rhodamine B, basic fuchsin, and thymolphthalein, by a nanocomposite composed of ZnO-coated graphene oxide (ZnO/GO). This nanomaterial was prepared using a facile heating reflux method within 1 h. Scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction were introduced to students to characterize the synthesized products. Students could observe the time- and dose-dependent degradation as well as the reusability of ZnO/GO. Additionally, the addition of t-butanol, benzoquinone, and triethanolamine, scavengers of hydroxyl radical (•OH), superoxide anion (•O2–), and hole (h+), respectively, to the degradation system allowed them to master the underlying catalytic mechanism of ZnO/GO. This experiment improves students’ understanding of the photocatalytic effect of ZnO nanomaterials and stimulates them to engage in the field of applied chemistry and thus is worth recommending to undergraduates.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-13
·
IF 16.6
Xie Yifan,Feng Shuo,Deng Linxiao,Cai Aoran,Gan Liyu,Jiang Zifan,Yang Peng,Ye Guilin,Liu Zaiqing,Wen Li,Zhu Qing,Zhang Wanjun,Zhang Zhanpeng,Li Jiahe,Feng Zeyu,Zhang Chutian,Du Wenjie,Xu Lixin,Jiang Jun,Chen Xin,Zou Gang
Artificial chiral materials and nanostructures with strong and tuneable chiroptical activities, including sign, magnitude, and wavelength distribution, are useful owing to their potential applications in chiral sensing, enantioselective catalysis, and chiroptical devices. Thus, the inverse design and customized manufacturing of these materials is highly desirable. Here, we use an artificial intelligence (AI) guided robotic chemist to accurately predict chiroptical activities from the experimental absorption spectra and structure/process parameters, and generate chiral films with targeted chiroptical activities across the full visible spectrum. The robotic AI-chemist carries out the entire process, including chiral film construction, characterization, and testing. A machine learned reverse design model using spectrum embedded descriptors is developed to predict optimal structure/process parameters for any targeted chiroptical property. A series of chiral films with a dissymmetry factor as high as 1.9 ( g abs ~ 1.9) are identified out of more than 100 million possible structures, and their feasible application in circular polarization-selective color filters for multiplex laser display and switchable circularly polarized (CP) luminescence is demonstrated. Our findings not only provide chiral films with the highest reported chiroptical activity, but also have great fundamental value for the inverse design of chiroptical materials.
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RSC Advances
·
2021
·Vol. 11
·期 14
·8255-8263
·
IF 3.361
Jun Wu,Wei Liu,Rui Zhu,Xiashi Zhu
A special self-designed device based on poly-1-vinyl-3-pentylimidazole hexafluorophosphate (PILs-C5) solid-phase extraction and high performance liquid chromatography (HPLC) is proposed as a novel method for the on-line separation and analysis of Rhodamine B (RhB) dye. Single factor experiment design and orthogonal experiment design were used to optimize the experimental parameters, such as pH, the amount of PILs-C5, sample volume, flow rate, eluent type, eluent concentration, eluent volume, and the flow rate of eluent. Under the optimized conditions, the linear range was 0.02–2.4 μg mL−1, with the correlation coefficients (R2) of 0.997. The limit of detection (LOD) and limit of quantification (LOQ) were 0.004 μg mL−1 and 0.02 μg mL−1, respectively. The extraction capacity was 6.22 mg g−1, and enrichment ratio was 15. The extraction mechanism and the post-treatment method of PILs-C5 were also studied. This method was applied to analyze RhB in a wide variety of real samples with satisfactory results.
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