JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
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IF 8
Mengen Zhang,Qiyang Xi,Linlin Wang,Qinxing Xie,Zhenhuan Li,Maliang Zhang
The heat and corrosion resistance of traditional membranes is inadequate, thus making them inadequate for the separation/filtration needs of harsh environments. Polyphenylene sulfide(PPS) can be used to develop new-generation membrane materials, but PPS has problems such as hydrophobicity and UV resistance. This article proposes a PPS membrane for efficient separation/filtration under extreme conditions, which uses melt-blown PPS non-woven fabric and undergoes oxidation and nitrification modification. Combining the advantages of metal-organic framework material (ZIF-67), a hollow ZIF-67/PPS non-woven fabric membrane has been successfully prepared, solving PPS's hydrophobic and UV-resistant problems. It is ideal for wastewater treatment and air filtration in harsh environments yet retains hydrophilicity even in intense alkaline and high-temperature conditions. The hollow ZIF-67/PPS membrane exhibits a very high pure water flux (34,261 L m −2 h −1 ). Surprisingly, the ZIF-67/PPS membrane exhibits strong chemical/thermal performance, maintaining good separation/filtration performance even after multiple cyclic tests in extreme conditions. The ZIF-67/PPS membrane with large-scale production capacity has reasonable prospects of dealing with environmental problems under extreme conditions.
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高影响因子
Water
·
2024
·Vol. 16
·期 9
·1281
·
IF 3
Xiuneng Zhu,Jie Qiu,Yexing Wang,Yulin Tang,Yongji Zhang
There is more and more research focusing on the removal of dioxane by advanced oxidation technology at this stage, and this study investigated the efficacy of an advanced oxidation system with UV-activated persulfate (UV/PDS). This method had the advantages of fast reaction rate, simple equipment and convenient operation. Free radical quenching test and electron paramagnetic resonance (EPR) analysis showed that the main active radicals in the reaction system wereSO4−and ·OH. This study also investigated that the optimal parameters were the initial PDS dosage of 3 mM, the UV intensity of 0.190 mM/cm2, the pH between 5 and 7 and the initial dioxane concentration of 50 mg/L. Additionally, after a reaction time of 150 min, the total organic carbon (TOC) content still remained at 83.53%, which revealed that the mineralization degree of organic matter was not fully achieved through UV/PDS treatment. The concentration ofSO42−in the reaction system was 74.69 mg·L−1, which complied with the standard concentration specified. Furthermore, the cytotoxicity of the system exhibited an initial increase followed by a subsequent decrease, under the influence of the intermediates. It showed that the technology could efficiently degrade organic pollutants.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Taotao Liu,Wenwen Nie,Wei Song,Tong Zhou,Haiying Tang,Xinghai Li,Xuefeng Yu,Guoyu Zhang,Ning Zhao,Changsong Wang
More than 80 % of the potash fertilizer globally is produced by the froth flotation process. Octadecylamine (ODA) and 4-dodecylmorpholine (DMP), the most commonly used flotation collectors, are discharged into salt lakes, posing a hazard to human health and environmental safety. This study investigated ODA and DMP degradation processes under ultraviolet radiation. The experimental results showed that the degradation efficiency of ODA and DMP of 10 ppm reached 100 % within 60 min of UV irradiation in the brine. In contrast, complete degradation in pure water required 80 and 90 min for ODA and DMP, respectively. Notably, salt ions significantly accelerated the degradation of these organic amines compared to pure water. The nitrogen element in both compounds was ultimately converted into ammonium (NH₄⁺). Total organic carbon (TOC) measurements and gas chromatography-mass spectrometry (GC-MS) analyses revealed that the degradation process initiated with the cleavage of C-N bonds, followed by the breakdown of carbon chains. Based on GC-MS data, potential degradation pathways and mechanisms for ODA and DMP were proposed. The possible degradation pathways and mechanisms of ODA and DMP were proposed following GC-MS analyses. Field experiments and the detection of organic compounds in actual brines further validated the photodegradation reactions and mechanisms of the organic amines. This work guides the use of flotation agents and pollution control to produce potassium salts in salt lakes and aids in understanding the degradation processes of organic amines in natural environments.
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JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Shaobin Wen,Liyuan Fan,Yanqiu Wang,Tianheng Wang,Mengshi Chen,Qiang Zhang
A solvent-free photopolymerization method was employed to fabricate pervaporation membranes to separate polar/non-polar organic solvent mixtures. Commercially available monomers bis[2-(3,4-epoxy cyclohexyl)ethyl] tetramethyldisiloxane (TMDG) and 3,3'-(Oxybis(methylene))bis(3-ethyloxetane) (DOX), along with a photo-initiator, were mixed and spin-coated onto the PVDF membranes surface, followed by UV-curing to form polyether-polysiloxane coatings. This approach eliminates the use of organic solvents, offering a simple, efficient, and cost-effective process with significant economic and environmental benefits. Precise control over the coating structure and polarity was achieved by adjusting the monomer ratios. Among these composite membranes, M3 demonstrated excellent permeability and separation efficacy for the pervaporation of polar/non-polar mixed organic solvents. At 45 °C, the flux of M3 to acetone/n-hexane (5 wt %/95 wt %) and methanol/n-hexane (5 wt %/95 wt %) were 615 and 559 g m −2 h −1 , respectively, and the separation factors were 836 and 798, respectively. Moreover, M3 also exhibited an excellent separation effect on acetone / n-hexane azeotropes (59 wt % / 41 wt %, 49.8 °C), with a flux of 1806 g m −2 h −1 and a separation factor of 121. Ultimately, M3 maintained stable permeability and separation performance for acetone/n-hexane (5 wt %/95 wt %) throughout 168 h, demonstrating the outstanding chemical stability of the coating prepared by UV-curing.
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Journal of Physical Chemistry C
·
2025
·
IF 3.2
Minghao Zhou,Yanlai Wang
CuGaS2 quantum dots (QDs) with uniform size distribution and monodispersion were successfully synthesized by using the hot injection method. Their microstructure, energy band structure, optical properties, and photocatalytic degradation activity were systematically studied. When the reaction temperature was between 180 and 260 °C, the prepared CuGaS2 QDs exhibited a single chalcopyrite structure. The diameter increased from 5 to 18 nm, while the optical band gap decreased from 3.11 to 2.64 eV. Notably, CuGaS2 QDs synthesized at an optimal temperature of 220 °C, with a mean particle size of 8 nm, demonstrated remarkable photocatalytic activity. Under 60 min of UV-LED irradiation at 365 nm, degradation rates of 93.76% for tetracycline hydrochloride (TCH) and 22.45% for methyl orange (MO) were achieved. These results indicate the tremendous potential of CuGaS2 for water pollution remediation.
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ACS Nano
·
2024
·
IF 15.8
Huimin Yang,Xiaoming Mo,Wangbing Xiong,Kailian Dong,Yulu Zhou,Xiaoma Tao,Yifang Ouyang,Jialong Zhao,Guojia Fang
Ultraviolet photodetectors (UV PDs) based on microcrystals (MCs) have attracted extensive attention due to their outstanding detection performance. Nevertheless, precise manipulation of the MCs still remains challenging, which may hinder the mass processing and performance improvement of the UV PDs. In this work, a single high-quality Cs3Cu2I5 MC that had a special X-shaped morphology was demonstrated to be successfully manipulated to prepare high-performance UV PDs by virtue of optical focusing, probe micromanipulation, and direct-write photolithography techniques. The UV PDs, prepared on the counter limbs and adjacent limbs of the single X-shaped Cs3Cu2I5 MC, exhibited distinctly different dual-mode photoresponse under 254 nm UVC and 310 nm UVB irradiations. At light intensity as low as 2.59 μW/cm2, the counter electrode and adjacent electrode UV PDs showed quite a high responsivity of up to 3376 A/W, a specific detectivity of up to 2.37 × 1014 Jones, and an on/off ratio of up to 1.79 × 102 at a bias voltage of 5 V. Besides, even after 28,800 s (8 h) of continuous operation under dual-mode UV irradiations at 254 and 310 nm, the unpackaged device showed extraordinary stability in the photocurrents in ambient air. Our findings provide inspiration for preparing high-performance dual-mode UV PDs based on the microscale perovskite-inspired copper halides or other semiconductor MCs.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2025
·
IF 2.8
Naipin Chen,Jiaqi Liu,Lingqi Deng,Fang Wang
Microcapsule-based self-healing systems, capable of remediating epoxy resin fatigue microcracks, present promising prospects for prolonging their service life. However, there is a pressing need to improve the mechanical properties, especially toughness, of the composite resin. Herein, a dual-compartment microcapsule was proposed to ingeniously integrate into the epoxy resin matrix, which could endow the composites with improved toughness and the remarkable capability of self-repair against intrinsic injuries. Preparation methods included the soap-free emulsion polymerization for PSA nanoparticles loaded with the healing agent, alongside the development of PDA nanoparticles encapsulating a catalyst through Pickering emulsion polymerization. Subsequently, a composite microcapsule was assembled via a coupling reaction between PSA and PDA nanoparticles. Self-healing performance indicated that the incorporation of 2 wt% microcapsules could significantly restore the tensile strength of epoxy resin to 68.37%. Remarkably, the long-term anti-corrosion of the epoxy coating with microcapsules was typically improved using electrochemical impedance spectroscopy measurements. The low-frequency impedance logarithm value of the composite coating remained stable at approximately 7.1, whereas the pure epoxy coating has dropped to 4.8. Furthermore, epoxy/microcapsule composite resin exhibited UV aging resistance and commendable storage stability at ambient conditions. This strategy provides epoxy resin with improved toughness, corrosion resistance, anti-UV irradiation, and self-healing performance.
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POLYMER DEGRADATION AND STABILITY
·
2024
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IF 6.3
Zhenggui Wu,Yanan Li,Hongmei Chen,Xinyi Dong,Qingfei Duan,Xudong Hao,Long Yu
The environmental concerns of microplastics (MPs) have attracted increasing attention due to their potential harm to human health. However, most of the MPs used in previous studies are from virgin materials through artificial granulation, as it is almost impossible to collect the natural MPs from nature and accurately identify their sources or ages. It is anticipated that the MPs after UV aging possess some major distinct characteristics similar as aged in nature, including variations in molecular weight, molecular weight distribution, surface chemicals. This study systematically investigated both virgin and UV aged samples derived from the most prevalent sources, including polyethylene (PE), polypropylene (PP), poly(ethylene terephthalate) (PET), polystyrene (PS), and poly(vinyl chloride) (PVC), focusing on the effects of the artificial digestion system on the MPs. Additionally, the study evaluated the impact of these MPs on health by examining their effects on probiotics within the digestive system. The results demonstrate that both the effect of digestion treatment MPs and the impact of MPs on intestinal microbiota are significantly different between virgin and aged MPs. While digestion processes were ineffective in degrading virgin MPs, primarily due to their chemical inertness, the surface changes in MPs were more pronounced after UV aging, though they remained largely unaffected by digestion. The surface chemical changes were significant during aging but not during digestion. On the other hand, certain MPs, particularly PVC, may disrupt the balance of intestinal microbiota, especially from aged samples.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2024
·
IF 1.2
Guofen Zhou,Linlin Yu,Wenlong Guo,Zhongwei Jiang,Lianzhe Hu,Min Wang
In this study, nanozyme is used for monitoring the dose of ultraviolet (UV) in sunlight for the first time. We find that nitrogen-doped carbon dots (N-doped C-dots) can effectively catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) under different UV region including UVA, UVB, and UVC. In comparison, the N-doped C-dots fail to show the catalytic activity under visible light. The finding is applied for distinguishing UV light and visible light through the color change of TMB. More importantly, the photo-oxidation TMB catalyzed by N-doped C-dots can work well in a near neutral pH, which is beneficial for its application in wearable device due to the reducing of acid corrosion. Finally, a wearable bracelet is fabricated by integrating N-doped C-dots and TMB into hydrogels. The bracelet is used for monitoring the UV exposure in sunlight. The color change of TMB in the bracelet can be clearly observed by naked eyes or quantified by a smartphone. The bracelet is also used for distinguishing different weather condition such as sunny/cloudy or different place such as indoor/outdoor during a sunny day. This study provides the first example of nanozyme in wearable UV sensor and will stimulate the applications of nanozyme in wearable device.
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Yue Wu,Yukai Wu,Shuting Zhang,Shusen Wei,Chen Jin,Yang Zhang,Hong Dong,Yanjiang Song,Zhirong Qu,Chuan Wu
Hexamethylcyclotrisiloxane was polymerized by non-equilibrium anion living polymerization initiated by lithium dimethylsilanol, and bridged with methyltrifluoropropyldichlorosilane to prepare methyltrifluoropropylsiloxy-bridged α, ω-dimethylsiloxy-terminated polydimethylsiloxane (DTFP), and then methyltrifluoropropylsiloxy-bridged α, ω-dimethylacryloxybutylsiloxy-terminated polydimethylsiloxane (DAFP) was prepared through hydroxyl protection, hydrosilylation, deprotection of trimethylsiloxyl groups and condensation reaction with acrylic acid. DAFP was mixed with α , ω -bis[dimethyl-[3-[2,2-bis(acryloyloxy)butoxy]propyl]silyl]-terminated PDMS oligomer (DBABP), a crosslinking density modifier, at a mass ratio of 70: 30, and then 2 parts of a photoinitiator consisting of 2-hydroxy-2-methyl-1-phenyl-1-propanone and diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide blended at a mass ratio of 1: 1 were added, and a cured film was prepared under UV light irradiation. The effects of initiator composition, UV irradiation time, and molecular weight of DAFP oligomers on the gelation yield, water absorption, water contact angle, thermal stability, and dielectric properties of the UV-cured products were investigated. These findings are significant as they contribute to the understanding of the synthesis and characteristics of new materials in the field of materials science and polymer chemistry. DAFP oligomers can be copolymerized with the DBABP oligomer within 25 s of UV irradiation. The sample (DAFP-2) with the best performance has a gelation yield of about 87 %, its T5% in nitrogen can reach 377.7 °C, its water absorption rate is as low as 0.85 %, and its surface water contact angle can reach 116°. Under 2 GHz conditions, the dielectric constant of the UV-cured PDMS film containing 2.61 % F element is 2.71, which is 9.1 % lower than that of the pure PDMS. Meanwhile, its dielectric loss is also significantly reduced.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xuanxuan Huang,Rui Huang,Qian Zhang,Zhaohong Zhang,Jinlong Fan
Plastic pollution, UV radiation and food spoilage have attracted widespread public attention, which will pose a serious threat to the global environment and human health. Therefore, the preparation of renewable, degradable, environmentally friendly packaging materials with antimicrobial activity and UV-shielding properties is urgent. In this work, we describe a simple strategy for the preparation of antimicrobial and UV resistant composite films. Specifically, silver nanoparticles (AgNPs) were synthesized in situ on the surface of cellulose oxide (TOCN) using a one-pot method, and then the folic acid (FA) modified TOCN was blended with silver loaded cellulose oxide (TOCN@AgNPs), and the films were prepared using a vacuum-assisted filtration device. The experimental results showed that the film inhibited both Staphylococcus aureus and Escherichia coli, and at the same time, the film had excellent UV-shielding properties and mechanical strength. Therefore, the film will be an ideal candidate for replacing plastics and extending the shelf life of food. In addition, the method is expected to reduce the environmental impact of plastics.
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ACS Nano
·
2025
·
IF 16
Xue-Mei Dong,Chen Chen,Yin-Xiang Li,Hong-Chao Sun,Bin Liu,Zi-Fan Li,Kai-Li Wang,Zi-Xi He,Meng-Na Yu,Wei Huang,Ju-Qing Liu
Neuromorphic vision sensors capable of multispectral perception and efficient recognition are highly desirable for bioretina emulation, but their realization is challenging. Here, we present a cocrystal strategy for preparing an organic nanowire retinamorphic vision sensor with UV–vis–NIR perception and fast recognition. By leveraging molecular-scale donor–acceptor interpenetration and charge-transfer interfaces, the cocrystal nanowire device exhibits ultrawide photoperception ranging from 350 to 1050 nm, fast photoresponse of 150 ms, high specific detectivity of 8.2 × 1012 Jones, and responsivity of 15 A W–1, as well as retina-like photosynaptic plasticity behaviors. Utilizing the sensor nerve and convolutional neural network, the architecture achieves 90% accuracy in recognizing colorful images. The cocrystal design offers an effective method for constructing nanowire photosynases with high performance in artificial visual systems.
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