Environmental Science-Advances
·
2022
·Vol. 2
·期 1
·98-106
·
IF 0
Jingzhen Zhang,Qian Zheng,Chen Chen,Xiangcheng Zhang,Xiaoyan Guo,Mingce Long
A self-maintainable decentralized water treatment system is appealing, while avoiding chemical addition is the prerequisite to realize it. As a widely used chemical in advanced oxidation processes (AOPs), H2O2 can be produced via photocatalysis. However, there remain challenges to use the photocatalytically produced H2O2 for water purification in a continuous operation, which requires that the produced H2O2 solution has no impurity and the catalyst powder is easily separable. We realized this by photocatalytic H2O2 production over magnetic separable photocatalytic microspheres through a sequencing batch process and coupling with ultraviolet C (UVC)/H2O2 for micropollutant removal via a flow-through operation. The photocatalysts were synthesized by in situ growth of a resorcinol–formaldehyde (RF) copolymer on Fe3O4@SiO2 microspheres, which can convert earth-abundant water and air into H2O2 under visible light irradiation. A clean H2O2 solution was produced at 100 μmol h−1 g−1 over magnetic photocatalysts and separated by using an external magnetic field. The on-site utilization of the obtained H2O2 solution was realized via UV light irradiation. This work provides a rational design of easily separable photocatalysts for H2O2 production, and offers insights for development of water purification processes with zero chemical addition and maintenance.
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DOI
Materials Research Express
·
2020
·Vol. 6
·期 12
·125355
·
IF 1.929
Xiangxin Xu,Huiping Liu,Songmei Duan,Xuhui Liu,Kai Zhang,Jianqiu Tu
The pumpkin seeds protein (PSP) films have good gas barrier properties and elongation at break, but their inferior tensile strength and high moisture adsorption needed to be overcome. There are few reports about modification of PSP films so far. This study was to investigate the effects of different ratios (0:5, 1:4, 1.5:3.5, 2:3, 2.5:2.5 and 5:0) of pea starch (PS)/ pumpkin seeds protein (PSP) on the morphology, mechanical properties, water vapor permeability (WVP), optical properties, hydrophobicity, and oil resistance of blend films. According to the results, the scanning electron micrographs of surface and cross-sections indicated the good biocompatibility between PS and PSP. The tensile strength was enhanced from 5.02 MPa to 16.41 MPa with the incorporation of PS at 40% level, but the elongation at break was decreased meanwhile. The addition of PS enhanced the hydrophobicity and reduced the swelling degree of films. And then, the composite films incorporated with PS were more transparent at visible region. The oil soaking had little effect on the mechanical properties of composite films with low starch content. The addition of starch led to the closer interaction between water molecules and macromolecules in film-forming matrix. In addition, the PS/PSP composite films showed inferior barrier properties of water vapor and ultraviolet light compared with pure PSP films. Based on the above various factors, the composite film composed of PS and PSP in a suitable proportion has the potential to package oily foods.
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DOI
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Liangchen Long,Yinan Bu,Baiyang Chen,Rehan Sadiq
To discover an applicable technology for urea abatement from swimming pool water (SPW), this study compared the performances of seven ultraviolet (UV)-based technologies on urea removal, including UV alone, UV coupled with hydrogen peroxide (UV/H 2 O 2 ), sulfite (UV/Na 2 SO 3 ), potassium persulfate (UV/K 2 S 2 O 8 ), a combination of UV and vacuum UV (UV/VUV), and UV/VUV in tandem with either H 2 O 2 (VUV/H 2 O 2 ) or potassium persulfate (VUV/K 2 S 2 O 8 ). Among them, UV and UV/Na 2 SO 3 showed little removal ability, and UV/H 2 O 2 removed only 12.8% of urea within 3-h experiments, while UV/VUV degraded 71.7% of urea without introducing substantial total dissolved solids (TDS). Therefore, UV/VUV was considered as a promising technology for further exploration. In comparison, although UV/K 2 S 2 O 8 exhibited higher urea removal than UV/VUV, it caused dramatic increases of TDS, which made the regulatory threshold for the TDS increment difficult to maintain. Within UV/VUV studies, some common components in SPW (e.g., cyanuric acid , humic acid , nitrate, and bicarbonate) inhibited the removal process, whereas chloride and sulfate facilitated it, while free chlorine at doses ≤ 3 mg-Cl 2 /L and pH levels from 6.8 to 8.0 imposed little impact on urea degradation. Overall, UV/VUV degraded 40.0% and 22.2% of urea from tap water and SPW, respectively; both were lower than the efficiency observed in ultrapure water. As for reaction byproducts, urea phototransformation via UV/VUV yielded nitrate and ammonia as the key products with the mass balance of nitrogen element being met. However, the contents of organic carbon decreased at a rate slightly lower than urea degradation, suggesting that urea was mostly mineralized and slightly converted to unknown organic compounds. The results hence demonstrate that UV/VUV is an effective alternative for urea removal from SPW.
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Pengju Xia,Wanyuan Li,Kaiting Wu,Yifeng Lei,Wubin Dai
In the process of studying newfangled phosphor-converted white-light-emitting diodes (pc-wLEDs), some basic and important objectives of phosphor, i.e., high chemical/thermal stability, color rendering index (CRI), and low correlated color temperature (CCT), should pass muster simultaneously. Herein, for the first time, a series of photoluminescence (PL) color-tunable single-phase Ca3Y(GaO)3(BO3)4: Dy3+/Sm3+/La3+ (CYGB: Dy/Sm/La) phosphors with good dispersivity, crystallinity, and size uniformity have been designed and synthesized via a facile solid-state reaction method. Structurally, based on XRD and Rietveld refinements, the tendentious occupations of Dy/Sm/La on the Y3+ site with a 9-coordinated number (CN) over other cationic sites are in line with the facts that the ionic radius and charge difference of Dy/Sm/La are much closer to Y3+ in 9-CN than Y3+ in 7-CN and Ca2+ in both 9- and 7-CN. Spectrally, thanks to the “cool” white PL from 4f–4f transitions of Dy and red-emitting from Sm, polychromatic PL including “warm” white light with high efficiency could be realized in CYGB: Dy/Sm via the regulation of doping content and energy transfer (ET). Intriguingly, the “abnormal” phenomena of zero-thermal-quenching in the range from room temperature (RT) to 573 K were observed, probably owing to the synergistic effects of electron–phonon coupling, ET, and structural defects. Moreover, by tridoping La3+ to legitimately adjust the site environments, the PL of both Dy/Sm could be further tuned because they all include hypersensitive transitions that are closely related to the crystal field environment. Finally, as a proof-of-concept fabrication, the pc-wLED assembled by a combination of the composition-optimized CYGB: Dy/Sm/La and an n-UV LED chip via remote “capping” packaging shows attractive performances, indicating its potential as an efficient phosphor for n-UV wLEDs.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jinyuan Zhang,Tian Shi,Tong Liu,Fuhua Gao,Da Cai,Pingwei Liu,Shenghong Yang,Yueli zhang
Combining upconversion materials with narrow-wide bandgap semiconductors to construct heterostructured composite photocatalysts effectively improves solar energy conversion efficiency. NYF:Ln 3+ (Ln = Yb,Er,Tm)@BiOX(X = Cl,Br,I) heterostructures were prepared by a two-step hydrothermal method. This work explores the effects of different lanthanide ion doping and narrow-wide bandgap bismuth oxyhalides on the performance of the heterostructures system. Under near-infrared (NIR) light irradiation, NYF:Yb,Er,Tm@BiOI degraded 94 % BPA within 160 min. Significantly, compared with NYF:Yb,Er@BiOCl, NYF:Yb,Er@BiOBr and the NYF:Yb,Er,Tm/BiOI mechanical mixtures, the photocatalytic activity of NYF:Yb,Er,Tm@BiOI was increased by 9.4 times, 3.7 times and 1.8 times, respectively. The enhanced photocatalytic activity is attributed to the doping of Er-Tm double-activated ions, which provides multiple upconversion emissions and forms more overlap in the narrow bandgap BiOI absorption spectrum, making it advantageous to utilize upconversion light fully. Eventually, an underlying mechanism was proposed that the existence of FRET in the NYF:Yb,Er,Tm@BiOI heterostructure leads to enhanced photocatalytic activity. This work provides new insights into the design of advanced structures for NIR-responsive photocatalysts.
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高影响因子
Canadian Journal of Chemistry
·
2020
·Vol. 98
·期 5
·
IF 1.171
Keke Ning,Guoqiang Xiang,Cuicui Wang,Jingxing Wang,Xiaohong Qiao,Ruofei Zhang,Xiuming Jiang,Lijun He,Wenjie Zhao
In this work, poly(sodium 4-styrenesulfonate) (PSS) modified molybdenum disulfide quantum dots (MoS2-PSS QDs) were synthesized via a simple hydrothermal method using l-cysteine and anhydrous sodium molybdate as precursors and PSS as a modification reagent, and a selective and sensitive fluorescent sensing method for the determination of p-nitrophenol (p-NP) based on their UV emission was developed. The obtained MoS2-PSS QDs have an obvious UV emission peak (390 nm) with quantum yield of 5.13%. The strong absorption peak of p-NP at 400 nm has large spectral overlap with the UV emission peak (390 nm) of MoS2-PSS QDs. Because of this p-NP absorption, the fluorescence of MoS2-PSS QDs at 390 nm is quenched with the introduction of p-NP via the inner filter effect (IFE) and the decreased fluorescence intensity was linearly proportional to the p-NP concentration in the range of 1–20 μmol/L, leading to a detection limit of 0.13 μmol/L for p-NP. The MoS2 QDs-based fluorescent probe for p-NP is sensitive and selective and was successfully applied in the determination of p-NP in the pond water samples with satisfactory results.
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高影响因子
SOLAR ENERGY
·
2025
·
IF 6.6
Wasim Ullah Khan,Waheed Ullah Khan,Naveed Ur Rahman,Shaukat Khan,Salim Ullah Khan,Javid Khan,Muhammad Wajid Shah,Dilfaraz Khan
Hybrid perovskite solar cells (PSCs) have garnered substantial interest from both academic and industrial spheres. However, some of the striking disadvantages regarding the adverse environment and UV-light stability restrict their durability for large-scale implementation. Herein, we reported, that a multifunction intermittent layer made of down-conversion (DC) cerium-doped microcrystal (CDM) is incorporated in PSCs. The DC layer shields the perovskite layer from UV-light through its absorption and also increases the spectral range of the active layer by re-emitting in the visible-range. The DC-layer is used to enhance the stability in UV-light and photovoltaic performance of the PSCs. PSCs with CDM-coating achieved an enhanced current density of 24.09 mAcm −2 and a high power conversion efficiency (PCE) of 20.13 %, which were improved by 7 % and 17.7 %, respectively when associated with control-devices. Notably, the power conversion efficiency (PCE) of PSCs based on the CDM architecture sustains 88 % of its initial value following 70 h of exposure to UV-light irradiation. Moreover, the PCE remains at 90 % of its initial value even after 100 days in an ambient environment characterized by 20–25 % relative humidity. We believe that this research will pave new ways toward highly stable and durable PSCs for practical applications in the future.
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高影响因子
ENVIRONMENTAL POLLUTION
·
2014
·
IF 3.902
Hao Li,Bo Pan,Shaohua Liao,Di Zhang,Baoshan Xing
Iron is rich in soils, and is recently reported to form stable complexes with organic free radicals, generating environmentally persistent free radicals (EPFRs). The observation may challenge the common viewpoint that iron is an effective catalyst to facilitate the degradation of various organic chemicals. But no study was specifically designed to investigate the possible inhibited degradation of organic chemicals because of the formation of EPFRs in dry environment. We observed that catechol degradation under UV irradiation was decreased over 20% in silica particles coated with 1% hematite in comparison to uncoated silica particles. Stabilized semiquinone or quinine and phenol radicals were involved in HMT-silica system. EPFR formation was thus the reason for the reduced catechol degradation on HMT-silica surface under UV irradiation at ambient temperature. EPFRs should be incorporated in the studies of organic contaminants geochemical behavior, and will be a new input in their environmental fate modeling.
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Bingjie Zhang,Xiaoye Bi,Zexiong Li,Dong Xue,Tianyang Li,Baoping Wang,Chencheng lv,Yunpeng Wang,Tao Zhao
In this study, an innovative multifunctional coating for cotton fabrics via a straightforward UV-initiated polymerization method has been developed using a non-aqueous solvent. Synthesized from N-bromobutane, 1-vinylimidazole, potassium hexafluorophosphate (KPF₆), and sodium tetrafluoroborate (NaBF₄), the poly（ionic liquid） (PIL) imparts exceptional flame retardancy and hydrophobic properties to cotton fabrics. This PIL coating uniformly adheres to the cotton surface, significantly enhancing flame retardancy and durability. Notably, the PIL-PF₆-treated cotton achieved a high limiting oxygen index (LOI) of 39.5% and displayed a damaged length of approximately 94 mm in vertical flammability tests (VFT). Even after 20 washing cycles, the PIL-PF₆-treated fabric maintained a damaged length below 100 mm, highlighting its long-lasting effectiveness. This work offers a practical and effective strategy to enhance the safety and longevity of cotton fabrics, presenting promising applications in the field of flame-retardant textiles.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Shenghua Yang,Jinming Guo,Hongyu Yuan,Haixia Xiao,Xiaming Feng,Hongyu Yang,Cheng Yan,Wei Cai
Intumescent flame-retardant (IFR) systems are attractive alternatives to conventional halogenated flame retardants due to their halogen-free composition, efficiently reduced heat release, and low toxicity generation. Herein, a nitrogen–boron (N B) dual-element flame retardant, melamine borate (MB), was synthesized and subsequently incorporated into a UV-curable resin based on bis(2-methacryloxyethyl) phosphate to construct a ternary synergistic N/P/B IFR coating system. The structure, thermal stability, and flame-retardant properties of the resulting coatings were systematically investigated by various techniques and combustion tests. Increasing MB content raised the glass transition temperature (T g ), indicating enhanced network compactness and stability. The coating containing only 4 wt% MB achieved a UL-94 V -0 rating and exhibited a 56.35 % reduction in total smoke production (TSP), along with significantly improved thermal stability in terms of decomposition temperature and char residue. The synergistic contributions of phosphorus, nitrogen, and boron promote catalytic charring, gas release, and glass-phase reinforcement, leading to the formation of a dense, stable char barrier. This eco-friendly ternary IFR system overcomes the high loading requirements and toxicity concerns of conventional flame retardants, providing a promising strategy for the efficient and sustainable flame-retardant modification of polymeric coatings.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Juan Yu,Bowen Li,Yingyin Liu,Hanlu Ji,Liang Liu,Hong Sun,Yimin Fan
The preparation of functionalized chitin nanofibers through sustainable chemical modification methods is of significant importance for advanced sustainable nanomaterials. In this study, fluorescent chitin nanofibers (RFChN) were successfully prepared via amino-yne click chemistry, using deacetylated chitin nanofibers (DEChN) as the raw material and spiropyran with an activated alkyne group (SP-PA) for functionalization. The efficiency of the amino-yne click reaction was confirmed by comparing it with esterification reactions, demonstrating that the amino-yne click reaction provided higher efficiency and milder reaction conditions, resulting in minimal impact on the crystalline structure and morphology of the chitin nanofibers. RFChN exhibited enhanced red fluorescence with aggregation-induced emission (AIE) properties, due to the anchoring effect of the chitin nanofibers. RFChN inks displayed reversible color changes under UV light upon exposure to acidic and alkaline environments, making RFChN inks highly promising for applications in fluorescence-based anti-counterfeiting and environmental monitoring. In addition, RFChN films displayed improved hydrophobicity, with contact angles ranging from 101.34° to 106.71°, and excellent UV-blocking properties, shielding up to 98 % of UVC, 84 % of UVB, and more than 90 % of UVA radiation. Biocompatibility and biodegradability tests showed that RFChN films exhibited minimal cytotoxicity, with cell viability remaining high at 76.75 % after 48 h of exposure. The biodegradability of RFChN films was not compromised by the modification process, with complete degradation observed after 30 days. These results suggest that RFChN possess outstanding properties, including AIE fluorescence, hydrophobicity, UV shielding, biocompatibility, and biodegradability, making them promising candidates for applications in sustainable materials, fluorescent nanocomposites, environmental monitoring, and fluorescence-based sensing technologies.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaochen Qi,Fuli Li,Chih-Huang Weng,Kai Liu,Renchuan Fu,Na Liu,Longzhen Ding
2-(2-Hydroxy-5-methylphenyl) benzotriazole (UV-P), a high-production and structurally complex benzotriazole derivative, has an uncertain degradation pathway and transformation dynamics in aquatic environments, raising concerns about its potential toxicological risks to human health and the ecological systems. This study investigated the oxidative degradation of UV-P by ferrate(VI) in aqueous solution under controlled experimental conditions. The results demonstrated that ferrate(VI) efficiently degraded UV-P under alkaline conditions, achieving a maximum removal efficiency of 91.76 % at pH 8.0. Furthermore, the influence of various environmental factors, including pH, oxidant dosages, inorganic ions (HCO 3 − , Cl − , Br − , NO 3 − , Ca 2+ , K + , Mg 2+ , and NH 4 + ), and humic acid, on the ferrate(VI)-mediated oxidative degradation of UV-P were systematically examined. The results indicated that although inorganic ions and humic acid partially inhibited the degradation process, a satisfactory degradation efficiency was still attained. The intermediate identification results indicated that the ferrate(VI)-mediated oxidative degradation of UV-P primarily proceeded via bond cleavage, oxygen atom transfer, and radical coupling reactions, resulting in the formation of cleavage products, hydroxylated derivatives, and polymeric compounds. The oxidative degradation pathway of UV-P and key reactive sites targeted in the ferrate(VI) degradation system were examined through quantum chemical methods, including analyses of atomic charge distribution and frontier electron density. The toxicity assessment highlighted the need to focus on the chronic toxicity of specific aminated degradation products. This study is essential for elucidating the degradation mechanism of the benzotriazole compound UV-P in aquatic environments and comprehensively assessing its potential biotoxicity.
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高影响因子
危险品化学品经营许可证（带存储）