Journal of Environmental Sciences
·
2022
·
IF 6.796
Jie Xu,Yang Guo,Qian Yang,Xueling Bai,Runhua Lu,Menghui Liu,Zichen Kuang,Luo Zhang,Jing Li
Ultraviolet/persulfate (UV/PS) and Ultraviolet/hydrogen peroxide (UV/H 2 O 2 ) have attracted much attention in recent years as advanced oxidation processes for water treatment. However, it is not all clear how these two methods affect the formation of cyanogen chloride (CNCl) in the subsequent water chlorination process. In this study, it was found that both UV/H 2 O 2 and UV/PS pre-oxidation promoted the formation of CNCl in six actual water samples collected from urban rivers. Glycine, uric acid, arginine and histidine were investigated as the model compounds to explore the effects of different methods on the production of CNCl. The results showed that compared with chlorination alone, pre-oxidation by UV/H 2 O 2 and UV/PS can reduce the production of CNCl for glycine and uric acid by up to 95% during post-chlorination process. However, they can greatly promote the formation of CNCl for arginine and histidine by up to 120-fold. In a more detailed investigation, pre-oxidation of histidine formed highly reactive intermediates to chlorine, leading to increased CNCl formation and chlorine consumption. The results showed that the precursors of CNCl was altered after pre-oxidation, and need to be re-evaluated.
研究领域:
环境科学
·
水污染控制工程
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DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Xinqi Di,Xinyu Chen,Yujie Kang,Jing Yang,Yangming Zou,Jiang Jing,Jun Sun,Hongfei Li,Xiaoyu Gu,Sheng Zhang
The applications of polypropylene (PP) are severely limited by its flammability and poor resistance to UV aging. Melamine hydrogen bromide (MHB) and aluminum hypophosphite (AHP) are widely used as synergistic flame retardants. Hindered amine light stabilizers (HALS) are typically used as anti-UV agents for polyolefins. However, the direct combination of acidic MHB and basic HALS induces antagonistic interactions, leading to a deterioration in material performance. In this work, antagonism is mitigated by coating MHB with polysiloxane (Si-MHB). Moreover, the polysiloxane layer can improve the compatibility between the flame retardant and PP, thereby enhancing flame retardancy and mechanical properties. PP composites containing Si-MHB, AHP, and HALS derivative were prepared. After 60 h of UV exposure, the surface of PP/Si-MHB/AHP/HALS119 remained relatively smooth with some shallow cracks. The water contact angle was maintained at 92°, and the carbonyl index decreased to 10.45, pointing out that the degree of photodegradation was significantly lower than that observed in the control samples. Besides, the limiting oxygen index (LOI) of PP/Si-MHB/AHP/HALS119 reached up to 26.5 %. After 60 h of UV irradiation, LOI decreased to 24.8 % and still maintained UL-94 V-0 rating, the tensile strength and impact strength decreased by 7 % and 10.2 %, which was a significantly lower reduction compared to the control samples. The above results demonstrate that the coating polysiloxane can effectively mitigate the antagonistic interactions between MHB and HALS119, effectively enhancing the UV aging resistance, flame retardancy, and mechanical properties of PP composites.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Eslam Ibrahim El-Aswar,Mengkai Li,Yanyan Huang,Zhe Sun,Wentao Li,Zhimin Qiang
The key constraint of vacuum ultraviolet (VUV)/ultraviolet (UV) process is the short VUV penetration resulting in a relatively high local concentration of hydroxyl radicals (HO ● ) and associated mass transfer limitation. This study investigated the enhancement of organic contaminant degradation by combining VUV/UV process with air micro/nano bubbles (MNBs) (VUV/UV/MNBs). Using sulfamethazine (SMN) as a model contaminant, the degradation rate in the VUV/UV/MNBs process (0.219 min −1 ) was twice that of the VUV/UV process (0.108 min −1 ). This enhancement was attributed to three factors: (1) air MNBs improved mixing and mass transfer within solution, suppressing HO ● self-recombination, as evidenced by a decrease in H 2 O 2 concentration; (2) air MNBs optimized the light behavior in solution, enabling longer VUV penetration; (3) elevated dissolved oxygen levels facilitated additional HO ● generation and inhibited the recombination of carbon-centered radicals. The contributions of these factors were quantitatively evaluated. Additionally, the enhancement by air MNBs persisted in the presence of dissolved organic matter and coexisting anions (i.e., Cl – , NO 3 – , SO 4 2– ), and the effects of photoreactor inner diameter and initial SMN concentration were explored for potential practical applications. This study demonstrates the novel VUV/UV/MNBs as a high-efficiency and chemical-free advanced water treatment process.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Haishan Wu,Weiwei Zhang,Junjie Wu,Yuwu Chi
Nowadays, people are facing more and more threats from solar UV radiation due to global ozone layer depletion and the ozone hole. Therefore, it is highly desirable to develop a fast, simple, and sensitive sensor for solar UV radiation. In this work, recently emerging perovskite quantum dots (PQDs) with excellent optical properties are used for sensing solar UV radiation. PQDs with high quantum yields are protected in solid paraffin to obtain paraffin-PQD composite (P-PQD) film. The hydrophobic and compact paraffin not only can protect PQDs from degradation by water and air for long-term use but also is transparent to UV light and thus maintains the high quantum yield of PQDs. The P-PQD film shows high sensing sensitivity for solar UV radiation based on which a novel visual ratiometric luminescence sensing strategy for UV light has been developed. The visual ratiometric luminescence sensor for solar UV radiation adopts a paraffin-encapsulated red fluorescence PQD (P-r-PQD) film as the sensing unit for UV light and a green luminescence light-emitting diode as reference light. When exposed to different solar UV radiation, the sensing film shows wide color variations from green to red, which can easily observed by the naked eye or recorded by a camera. On the basis of this, a simple and visualized solar UV index-reporting system has been established.
研究领域:
材料科学
·
光学
·
环境健康
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Wenhai Chu,Dongmei Li,Yang Deng,Naiyun Gao,Yansen Zhang,Yanping Zhu
Free amino acids (AAs) can form trihalomethanes (THMs) and haloacetonitriles (HANs) during chlorination in drinking water treatment plants, but they account for a small fraction of dissolved organic nitrogen (DON) pool in natural waters. In contrast, combined AAs contribute to a greater identifiable DON portion, but the information on the formation and control of THMs and HANs from them is limited. Ultraviolet/hydrogen peroxide (UV/H 2 O 2 ) and ultraviolet/persulfate (UV/PS), two typical UV-based advanced oxidation processes (UV-AOPs), are both promising drinking water technologies for the reduction of trace organic contaminants . The objective of this study is to examine the effects of the two UV-AOP pre-treatments on the formation of carbonaceous and nitrogenous disinfection by-products (C- and N-DBPs), which were indicated by THMs and HANs, respectively, during post-chlorination and chloramination of tyrosine (Tyr) in free and combined forms. Results showed that direct UV photolysis, PS pre-oxidation alone or H 2 O 2 pre-oxidation alone did not significantly impact the THM and HAN formation during subsequent chlorination. However, the two UV-AOP pre-treatments could somewhat alter the DBP formation. In general, under the identical doses (UV irradiation dose and molar oxidant dose), UV/PS pre-treatment better controlled the HANs than UV/H 2 O 2 during AA post-chlorination, though UV/PS might slightly promote the formation of chloroform . In contrast, the two UV-AOP pre-treatments did not obviously affect the THM and HAN formation when post-chloramination was applied. In addition, a marked difference was observed in the speciation of DBPs formed from free AAs and short oligopeptides in the presence of bromide. For free Tyr, more brominated THMs were formed than brominated HANs; but for short oligopeptides, more bromine was incorporated into HANs than THMs.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Mingliang Zhang,Jinchan Zhao,Sinong Wang,Zhenyu Dai,Shuaitao Qin,Shiliang Mei,Wanlu Zhang,Ruiqian Guo
Paper-based relics is an important carrier for recording and preserving information, however, it faces irreversible UV-induced damage, including photocleavage, oxidation, acidification and discoloration, which seriously affects its value and lifespan. Carbon dots (CDs) possess excellent UV absorption and good chemical stability, making them suitable for UV protection. Herein, we propose a high-security and efficient method utilizing CDs films (CDFs) for preventive protection of paper against UV damage. The CDFs with high tunable UV absorbance and minimal absorbance in the visible light range, effectively shield paper from UV radiation while preserving its visual appeal. Moreover, the UV transmittance of the film can be fine-tuned to the content of CDs and can be easily removed from the paper without residue. Artificial accelerated UV aging experiments demonstrate the deceleration of acidification, oxidation, and photocleavage in the protected bamboo paper and Xuan paper. This research paces a new direction for the protection of paper and paper-based relics and artworks with emerging carbon materials, offering customizable protection effects tailored to specific preservation and exhibition requirements. This research pioneers a novel approach to preventive protection of paper and paper-based relics using emerging carbon dots materials, offering tailored protection for diverse preservation needs.
研究领域:
文化遗产保护
·
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chen Ling,Chaolin Li,Aiping Liang,Wenhui Wang
Microplastics (MPs) pose a severe threat to the environment and human health, and effective treatment techniques are urgently desired to prevent the global spread of MPs pollution. However, efficient degradation of MPs remains difficult. Herein, vacuum ultraviolet (VUV) activated peroxymonosulfate (PMS) was firstly proposed as a promising technique for the degradation of polyethylene MPs. The weight loss of MPs reaches as high as 51.5% under mild conditions ([PMS] = 32 mmol/L, initial pH = 7, [MPs] = 1 g/L, [Time] = 48 h), which is the record performance achieved at room temperature and ambient pressure for MPs degradation. The excellent degradation performance is uncovered to originate from the synergistic effect of VUV and activated PMS. Direct photolysis of VUV can rapidly oxidize the surface of MPs to reduce its hydrophobicity and thus enhance the adsorption of reactive oxidation species (i.e., SO 4 ⋅− and HO ⋅ ) rooted from the VUV activated PMS, which was further confirmed by DFT calculations. The degradation of MPs repeatedly undergoes the process of VUV photolysis oxidation of the surface, degradation via VUV/UV/PMS-derived reactive oxidation species, shedding, and re-exposure of the new surface via VUV photolysis oxidation. This study highlights the unique role of the VUV photolysis in MPs degradation, paving a new route for designing practical MPs pollution remediation techniques.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Dan Li,Liangchen Long,Wei Xia,Weixin Zhao,Likui Feng,Xinhui Xia,Shufei He,Yu Liu,Shijie You,Liangliang Wei
Human body fluids related pollutants (BFPs) are primary precursors to disinfection by-products (DBPs) in swimming pool water (SPW). This study evaluated the degradation efficiency of ultraviolet/vacuum ultraviolet (UV/VUV) technology for the removal of three typical BFPs: urea, creatinine, and hippuric acid. The results showed that UV/VUV irradiation significantly enhanced the removal of these pollutants compared to UV alone. In addition, the observed rate constant (k obs ) of the UV/VUV system was 1.9–8.0 times higher than that of the UV/H 2 O 2 system, accompanied by a substantial 89.6 % reduction in the electrical energy per order (EEO). Urea degradation primarily involved the cleavage of C-N and C-H bonds within the urea molecule induced by VUV photolysis, whereas the degradation of creatinine and hippuric acid was mainly driven by a series of reactions (including decarboxylation, demethylation, hydroxylation, and ring opening) initiated by •OH. pH variations within the range of 6.8–8.2 exerted minimal impact on pollutant removal. However, NO 3 , humic acid, and cyanuric acid obviously inhibited the removal of BFPs. Employing UV/VUV system as a pretreatment step prior to chlorination disinfection led to a noteworthy reduction of 63.6 %-69.1 % of the adsorbable chlorine in actual SPW. Results of this study presented a green, chemical-free, and operationally simple method to mitigate DBPs formation in SPW.
研究领域:
环境科学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Maolin Wang,Tingwen Wei,Long Jiang,Jing Wang,Yajing Li,Wenyan Wu,Xiaojian Huang,Fang Wang,Sheng Lu,Xiaoqiang Chen
Developing ultraviolet (UV) sensors that can visualize UV light in the environment for productive life has been widely practiced. A challenging problem that arises in this domain is the quantitative analysis of UV light . In this study, we identified a novel naphthalimide derivative, NDGF , which can undergo decomposition to various degrees when irradiated by UV light with different intensities, so as to produce corresponding fluorescence intensities . Moreover, NDGF was prepared as a UV-responsive film NDGF-PEO which also has outstanding competence in the quantification of UV intensity. The surprising thing is that this novel UV-responsive decomposition mechanism of NDGF has been demonstrated and has great potential to open new doors for the development of naphthalimide-based photocages and novel UV quantitative sensors.
研究领域:
材料科学
·
光化学
·
分析化学
·
传感器
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2024
·
IF 3.8
Ke Wang,Xiaoyan Sun,Fayong Li,Dong Xie
Biodegradable films mitigate plastic pollution but often lack UV-aging resistance, shortening their lifespan. While anti-aging additives can boost the films' durability, small molecule migration constrains the extension of their service life. This study introduces a straightforward solid-phase reaction for producing carbon black (CB) grafted with the UV absorber UV531, termed CB-UV531. This material was then blended with the biodegradable polymer PBAT and transformed into a film via blow molding, yielding a durable UV-resistant biodegradable film (PBAT/CB-UV531). This solid-phase grafting reaction does not require any solvents, thereby reducing solvent contamination and waste, and it is simple to operate, allowing for scalable production. Compared to the unmodified CB, the obtained CB-UV531 exhibits significantly improved thermal stability, which can effectively reduce the loss of UV531 during the subsequent high-temperature film-blowing process. Furthermore, the chemically bonded UV absorber on the surface of CB-UV531, coupled with its reduced particle size, promotes enhanced dispersibility and consistent stability within the PBAT/CB-UV531 film, markedly improving its long-term resistance to UV aging. This method is expected to enhance the anti-aging effects of various commercial light stabilizer additives and can be used to extend the lifespan of different biodegradable materials. Highlights A simple solid-phase reaction method was developed to prepare CB-UV531. CB-UV531 reveals smaller size and superior dispersibility. Biodegradable PBAT/CB-UV531 film was prepared via a blowing process. UV531 migration loss in PBAT/CB-UV531 film is significantly reduced. PBAT/CB-UV531 film shows enhanced thermal stability and aging resistance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 7
·2200884
·
IF 4.6
Xiaohua Cui,Jiaming Liu,Ending Zhang,Ziyang Gong,Liyan Liang,Jun Shi,Xiaopeng Hao,Jiwen Hu,Mangeng Lu
Thermally conductive pressure-sensitive adhesive (PSA) has received a great amount of attention in recent years, but the traditional PSA hardly loses adhesion properties after UV irradiation or heating. Therefore, endowing thermally conductive adhesive with UV-responsive peelability becomes a design strategy. Herein, vinyl-functionalized graphene (AA-GMA-G) is prepared by modifying graphene with acrylic acid and subsequently reacting with glycidyl methacrylate. Then, the UV-curable acrylate copolymer is synthesized by grafting glycidyl methacrylate. Finally, the novel thermally conductivity PSA with UV-responsive peelability is obtained by blending the copolymer with AA-GMA-G and photoinitiator. The results show that the PSA at 2 wt% AA-GMA-G loading exhibits an excellent thermal conductivity (0.74 W m −1 K −1 ) and a relatively strong peel strength, increasing by 15% compared with pristine graphene/PSA. Interestingly, the peel strength of AA-GMA-G/PSA can achieve a dramatic drop after UV treatment, and the decrease rate is 96.7%. Therefore, the novel thermally conductive PSA with UV-responsive peelability has potential applications in certain electronic devices.
研究领域:
材料科学
·
化学工程
·
粘合技术
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Qiu Fu,Ying Qin,Xinjia Zhang,Lijian Sun,Jiang Chang
The harms caused by ultraviolet (UV) and blue light to eyes are attracting momentous concern due to growing exposure to artificial illumination and modern IT devices. Herein, a simple and eco-friendly adsorption approach was employed to integrate curcumin, a natural bioactive compound, into the cellulose substrate for the development of flexible and biodegradable filters capable of blocking harmful light. The curcumin/cellulose films demonstrate excellent UV-screening competence and photostability, with UV-A and UV-B screening ratios ranging from 92.8 % to 100 % and 89.2 % to 100 %, respectively. The films could block >96 % of blue light in the wavelength range of 400–500 nm. Meanwhile, the films maintain high transmittance (85.2–89.4 %) and low haze (2.0–2.7 %). The films can efficiently block blue light emanated from sunlight, light-emitting diodes, lighting systems, computer and mobile phone screens. Encouragingly, the incorporation of curcumin led to a substantial increase in the water contact angle, elevating it from 41.6 to 81.3°. Furthermore, the films exhibit excellent antimicrobial properties, biodegradability, and tensile strength in excess of 72 MPa. Therefore, these films fabricated entirely from natural resources have the potential to achieve practical applications such as food packaging and spectacle lens, especially suitable for electronic screen protectors.
研究领域:
材料科学
·
生物医学工程
·
光学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）