ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2013
·
IF 5.257
Xubiao Luo,Fang Deng,Lujuan Min,Shenglian Luo,Bin Guo,Guisheng Zeng,Chaktong Au
Inorganic-framework molecularly imprinted TiO2/WO3 nanocomposites with molecular recognitive photocatalytic activity were first prepared successfully by a facile one-step sol-gel method using 2-nitrophenol and 4-nitrophenol as template molecules, and tetrabutyl orthotitanate as titanium source as well as the precursor of functional monomer which could complex with template molecules. The template molecules could be completely removed by means of high-temperature calcination, avoiding the traditional extraction procedures that are time- as well as solvent-consuming. Compared to nonimprinted TiO2/WO3, the molecularly imprinted TiO2/WO3 shows a much higher adsorption capacity and selectivity toward the template molecules. The enhancement in terms of adsorption capacity and selectivity can be attributed to the chemical interaction between target molecules and imprinted cavities, as well as size matching between imprinted cavities and target molecules. The photocatalytic activity of molecularly imprinted TiO2/WO3 toward the target molecules is more than two times that of non-imprinted TiO2/WO3, a result of selective adsorption of target molecules on molecularly imprinted TiO2/WO3. The formation pathway of intermediate products in 2-nitrophenol and 4-nitrophenol degradation process was provided. Moreover, molecularly imprinted TiO2/WO3 exhibits high stability. The results indicate that inorganic-framework molecularly imprinted TiO2/WO3 nanocomposites have a promising prospect in the treatment of wastewater for irrigation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2021
·Vol. 14
·期 1
·44-51
·
IF 2.896
Lili Chen,Zihan Cheng,Xinyue Peng,Guoqiao Qiu,Li Wang
Nitroaromatic explosives pose a great threat to the environment and human safety. It is very important to design simple, highly efficient and multifunctional sensors for detecting nitroaromatic explosives. However, a few sensors can determine multicomponent nitroaromatic explosives simultaneously. Eu functionalized MOF-253 (Eu@MOF-253) hybrid material was synthesized using the post-synthetic modification method. The introduction of Eu3+ in MOF-253 caused the fluorescence peak of the ligand to show a distinct red-shift due to its polarization enhancement effect in the presence of 2,4-DNP. The emission and excitation spectra of the Eu@MOF-253 sensor showed overlap with the ultraviolet-visible (UV-vis) absorption spectra of the representative nitroaromatic explosives 2,4-dinitrophenol (2,4-DNP) and 2,4,6-trinitrophenol (TNP). Therefore, it is feasible to discriminate and quantify TNP and 2,4-DNP simultaneously. As proposed, the Eu@MOF-253 luminescent sensor was highly sensitive and selective towards TNP and 2,4-DNP. The other coexisting nitroaromatic explosives did not interfere with the determination. Upon addition of TNP, the fluorescence of the Eu@MOF-253 sensor decreased dramatically and showed an excellent quenching constant (Ksv) of 1.58 × 106. The fluorescence intensities of the Eu@MOF-253 sensor presented good linear relationships with concentrations of TNP and 2,4-DNP ranging from 0.01–100 μM and 0.01–25 μM, respectively. Low limits of detection (LOD) for both 2,4-DNP and TNP were approximately 10 nM. The determination mechanism is mainly ascribed to the internal filtration effect (IFE) and electron transfer. This work provides a practical method for the highly efficient determination of nitroaromatic explosives.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2020
·
IF 4.613
Yujiao Tu,Suping Wang,Xiaotian Yuan,Yingying Xiang,Kunhao Qin,Yunlin Wei,Qi Zhang,Xuemei Chen,Xiuling Ji
The blue fluorescent nitrogen, phosphorus doped carbon dots ( Tg N,P-CDs) deriving from Thelephora ganbajun Zang were successfully obtained by hydrothermal method . Tg N,P-CDs possessed excellent fluorescence features and displayed strong blue fluorescence emission at 444 nm under 356 excitation with good water solubility. Tg N,P-CDs exhibited low biotoxicity and excellent biocompatibility by live/dead bacterial differentiation, cell imaging and onion epidermal staining. Furthermore, the nanoprobes showed high selectivity and sensitivity in detecting 2,4-dinitrophenol (2,4-DNP) and 4-nitrophenol (4-NP), and excellent linear range of 0–50 μM (R 2 = 0.9923) and 0–50 μM (R 2 = 0.9926) with low detection limits of 35.09 nM and 78.62 nM for 2,4-DNP and 4-NP, respectively. The Tg N,P-CDs was successfully applied to determine 4-NP and 2,4-DNP in real water and soil samples. It revealed that the inner filter effect quenching mechanism dominated in quenching of Tg N,P-CDs fluorescent by 2,4-DNP and 4-NP. It provides a new insight on the bioimaging application and environmental pollutant detection.
研究领域:
材料科学
·
环境科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
Case Studies in Thermal Engineering
·
2025
·
IF 6.4
Juan Cheng,Chengyang Cao,Chong Xia,Guangyao Zheng,Chuan Zhang,Hongyun Hu
Nitrobenzene (NB), as a critical chemical intermediate with annual consumption exceeding one million tons, is widely used in the chemical manufacturing industry. However, its poor thermal stability when contaminated with impurities has caused multiple fire and explosion incidents. This study aims to investigate the effects of two typical phenols, p-nitrophenol (PNP) and o-nitrophenol (ONP), on the thermal behaviors of NB, and elucidate the impact mechanism. Experimental results indicate that the addition of 10% wt. PNP or ONP significantly reduces the main decomposition peak temperature of NB, initiating low-temperature exothermic reactions. Kinetic analysis reveals that while these additives increase the activation energy, the dramatic rise in pre-exponential factor indicates fundamental changes in the decomposition pathway. Specifically, NB-ONP exhibits the highest apparent activation energy due to intramolecular hydrogen bonding. Cleavage of these hydrogen bonds generates highly reactive phenoxy radicals that drive an efficient nitro-reduction pathway, leading to the most pronounced thermal hazard. Pure NB decomposition follows a second-order reaction model (F2), while mixtures with PNP or ONP conform to nucleation-growth (A3) and first-order (F1) models, respectively. Product analysis confirms that phenolic impurities reconstruct the reaction network through more complex pathways. Consequently, the thermal hazard risk follows NB-ONP>NB-PNP>NB. These findings provide crucial guidance for NB production: priority should be given to controlling high-risk ONP impurity generation by optimizing nitration process conditions to suppress relevant side reactions. The study clarifies the microscopic mechanism and provides important theoretical basis for targeted impurity management and safe NB production.
✓ 已验证
DOI
高影响因子
Journal of Central South University
·
2024
·Vol. 31
·期 1
·138-150
·
IF 3.7
Ouyang Yi-wen,Liang Jian-jun,Gao Xiao-feng
In order to efficiently remove 4-nitrophenol (4-NP) and 2,4-dinitrophenol (2,4-DNP), 4-NP and 2,4-DNP were used as template molecules and double-template magnetic molecularly imprinted polymers (D-MIPs) were prepared by surface molecular imprinting technology using itaconic acid as functional monomer, Fe 3 O 4 @SiO 2 as carrier, ethylene glycol dimethacrylate as crosslinking agent and azodiisobutyronitrile as initiator. The morphology of D-MIPs was characterized using FT-IR and SEM. The adsorption specificity, regenerability, and applicability of D-MIPs were studied in detail. The results show that D-MIPs successfully coated the surface of the Fe 3 O 4 @SiO 2 carrier and had a good polymerization effect, specific recognition sites, and good imprinting performance, with a diameter of 90 nm and homogeneous shape. The theoretical adsorption capacities of 4-NP-MIPs, 2, 4-DNP-MIPs, and D-MIPs for target molecules were 103.97, 73.14 and 123.99 mg/g, respectively. There were many adsorption sites with different adsorption energies. D-MIPs reached the optimal adsorption equilibrium state in 30 min. The best fitting models for the MIPs were the Freundlich adsorption and pseudo-second-order kinetic models, indicating that adsorption of MIPs occurred via a chemical adsorption process. Test results show that MIPs had highly specific recognition and selective adsorption capacity in different water samples. After eight regeneration cycles, the adsorption capacity of D-MIPs decreased by 7.51%, confirming that MIPs had excellent regeneration.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 3
·141
·
IF 3.504
Guangyin Fan,Xiaojing Li,Caili Xu,Weidong Jiang,Yun Zhang,Daojiang Gao,Jian Bi,Yi Wang
Developing highly efficient and recyclable catalysts for the transformation of toxic organic contaminates still remains a challenge. Herein, Titanium Carbide (Ti3C2) MXene modified by alkali treatment process was selected as a support (designated as alk-Ti3C2X2, where X represents the surface terminations) for the synthesis of Pd/alk-Ti3C2X2. Results show that the alkali treatment leads to the increase of surface area and surface oxygen-containing groups of Ti3C2X2, thereby facilitating the dispersion and stabilization of Pd species on the surface of alk-Ti3C2X2. The Pd/alk-Ti3C2X2catalyst shows excellent catalytic activity for the hydrodechlorination of 4-chlorophenol and the hydrogenation of 4-nitrophenol in aqueous solution at 25 °C and hydrogen balloon pressure. High initial reaction rates of 216.6 and 126.3 min−1·gpd−1are observed for the hydrodechlorination of 4-chlorophenol and hydrogenation of 4-nitrophenol, respectively. Most importantly, Pd/alk-Ti3C2X2exhibits excellent stability and recyclability in both reactions without any promoters. The superior property of Pd/alk-Ti3C2X2makes it as a potential material for practical applications.Keywords:palladium;titanium carbide;catalytic transformation;4-chlorophenol;4-nitrophenol
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 29
·16095-16102
·
IF 2.936
Guojuan Ren,Liying Yu,Baoya Zhu,Mingyu Tang,Fang Chai,Chungang Wang,Zhongmin Su
In this study, infrequent orange carbon nanodots (CNDs) were applied as a dual-readout probe for the effective colorimetric and fluorescent detection of 2,4,6-trinitrophenol (TNP). The orange fluorescence could be rapidly and selectively quenched by TNP, and the colorimetric response from the original pink color to blue could also be captured immediately by the naked eye. A limit of detection of 0.127 μM for TNP was estimated by the fluorescent method and 5 × 10−5 M by visualized detection. Interestingly, the fluorescence of the CNDs with TNP gradually transitioned from orange to green upon irradiation by a UV lamp, and the colorimetric response transitioned from pink to blue to colorless, which ensured effective multi-response detection of TNP. In addition, the CNDs exhibited bright fluorescence, excellent biocompatibility and low toxicity, making them high-quality fluorescent probes for cellular imaging.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2019
·
IF 4.916
Jie Ma,Lei Bian,Lei Zhao,Xiaotong Feng,Lizhi Zhao,Zhaoyan Wang,Qiaosheng Pu
Low-cost and nontoxic fluorescent reagents are important for on-site analysis performed by non-professionals. In this work, a cheap and widely available food additive , caramel was used as an effective fluorescence reagent for the sensitive detection of 2,4,6-trinitrophenol (TNP), 2,4-dinitrophenol (DNP) and 4-nitrophenol (4-NP). Through a simple dialysis, fluorescent components of a commercial caramel were harvested with a yield as high as 60%. The structural characterization demonstrated that the fluorescent components were dehydrated oligomers of carbohydrates. Their fluorescence can be quenched by these nitrophenols . The quenching mechanism was speculated as inner filter effect. At pH 8, a linear range of 0.2–22 μM and a detection limit of 90 nM could be achieved for TNP. Based on the difference of their quenching efficiency at different pHs, TNP, DNP and 4-NP can be simultaneously determined by solving the linear equations obtained at pH 3, 5 and 8. Successful detection of these nitrophenols in the water and soil samples was performed with relative standard deviations of 1.1–5.9% and recoveries of 95–108% of spiked standards.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Acta Metallurgica Sinica-English Letters
·
2022
·Vol. 35
·期 10
·1653-1664
·
IF 3.024
Xie Shenghui,Liao Xiang,Zeng Xierong,Yang Haipeng,He Liang
High-entropy alloys (HEAs) have attracted widespread attention due to their excellent mechanical properties. However, their functional properties arising from the supersaturated solid solution state can be improved. Advanced oxidation processes (AOPs) are considered to be an effective method for decomposing organic pollutants, and HEAs are proposed as effective candidates for AOP catalysts. Currently, several HEAs used for organic pollutant degradation are prepared through mechanical alloying. In this work, FeAlCoNi and FeAlCoNiB Fenton-like catalysts were prepared by single roll melt spinning and subsequent ball milling techniques. We found that the FeAlCoNiB HEA exhibits highly efficient degradation for p -nitrophenol ( p -NP). The degradation efficiency of FeAlCoNiB is 120 times higher than that of FeAlCoNi, which confirms that boron functions effectively during the degradation process. FeAlCoNiB has a better degradation efficiency than pure iron powder and a degradation efficiency comparable to that of the amorphous Fe 78 Si 11 B 11 alloy. Additionally, the degradation efficiency of FeAlCoNiB X increases ( k values from 0.13 to 0.55 min −1 ) when the boron content increases from an X value of 0.25 to 1.25. We speculate that Fe 2 B favors the degradation process and promotes zero-valent iron to decompose organic pollutants through a galvanic cell effect. Possible p -NP degradation pathways are proposed after LC–MS analysis. This study provides a new series of HEA Fenton-like catalysts, which have the potential to be prepared into bulk devices for industrial applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2023
·
IF 1.2
Quan-Xing MAO,Jun-Na YANG,Xi WU,Yang FU,Xi-Ming SONG,Tian-Yi MA
There are various kinds of pollutants in our environment from the discharged sewage that damage human’s health. Determination of multiple pollutants is important for safety and the detection methods are always needed. This study reports a determination method for p -nitrophenol ( p -np) and copper ions by using the dual fluorescence centers of N,S co-doped CDs (N,S-CDs). N,S-CDs was prepared by hydrothermal treatment of thiourea and citric acid in N N dimethylformamide. The as-prepared N,S-CDs are spherical particles with size distribution of 1.20±0.42 nm, as well as functional groups such as thiol and carboxyl. The rich surface species endow the CDs dual fluorescence centers at 380 nm/460 nm and 550 nm/625 nm. Interestingly, the fluorescence at 380 nm/460 nm can be quenched by p -np, while the fluorescence at 550/625 nm can be quenched by copper ions. Mechanism investigations revealed that inner filter effect of p -np and combination with copper ions are responsible for the fluorescence quenching. Determination methods are thus found with detection limits of 6.47×10 −6 mol L − 1 for p -np and 6.0×10 −7 mol L − 1 for Cu 2+ . Piped water are tested and the results are satisfactory with recoveries in the range of 94.33%—100.67% for p -np and 98.67%—106.33% for Cu 2+ . In conclusion, this work provides a new approach for determination of multiple targets by using the dual fluorescence of N,S-CDs.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Research
·
2018
·
IF 4.327
Nan You,Ji-Yu Li,Hong-Tao Fan,Hua Shen
Nitrophenols (such as o-nitrophenol (ONP), p-nitrophenol (PNP), and 2,4-dinitrophenol (DNP)) are priority environmental pollutants. Their toxicity is pH dependent, and these molecular species of nitrophenols exhibit higher toxicity than their anionic counterparts. Herein, for the first time, a method for the in situ measurement of nitrophenols in acidic industrial wastewater was developed using diffusive gradients in thin films (DGT) with lignocellulose hazelnut shell-derived activated carbons (HSACs) as the binding agents. Nylon membranes (0.1 μm rated) with diffusion coefficients of (2.02 ± 0.13) × 10 −6 cm 2 s −1 for ONP, (1.39 ± 0.09) × 10 −6 cm 2 s −1 for PNP and (1.20 ± 0.08) × 10 −6 cm 2 s −1 for DNP at 25 °C were used as the DGT diffusion layers. The accumulation of ONP, PNP, and DNP in DGT samplers based on the HSAC and nylon membranes (HSAC-DGT) agreed well with the theoretical curves predicted by the DGT equation in synthetic solutions with 200 μg L −1 nitrophenol. The uptake of the HSAC-DGT samplers for ONP, PNP, and DNP was found to be independent of the ionic strength of pNaNO 3 (−log [NaNO 3 ] (mol L −1 )) in the range of 0.7–3 and the pH range of 3–7 for ONP and PNP and 3–6 for DNP, which is beneficial for their accumulation. The matrices of the tested water samples exhibited no notable interference during nitrophenol analysis by the HSAC-DGT samplers. The results of field deployments in acidic industrial wastewater containing 268.3 ± 79.2 μg L −1 DNP were satisfactorily accurate, thus demonstrating that the HSAC-DGT samplers are good candidates for use in the in situ measurement of nitrophenols in acidic aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Jiacheng Ge,Xiaoyan Chen,Zhenqi Du,Yingying Zhou,Ruixin Qu,Jiangdong Cui,Shunke Ding,Wenhai Chu
Halogenated nitrophenols (HNPs) have raised significant concerns due to their extensive detection and potent toxicity. Understanding how these compounds persist and degrade over time is crucial for predicting their potential accumulation and assessing the long-term exposure risks. Kinetic studies showed that the degradation of HNPs through hydrolysis and chloramination over realistic hydraulic retention times is relatively low. The species-specific second-order rate constants for the reaction of hypochlorous acid and the acid-catalyzed reaction of hypochlorous acid with anionic HNP species, which accounted for HNP degradation during chlorination, range from 3.84 ± 1.09–363.25 ± 50.44 M⁻¹min⁻¹ and from (1.50 ± 0.091) × 10⁶ to (1.34 ± 0.36) × 10⁸ M⁻²min⁻¹ , respectively. The reactivity order of reactive species in hydrolysis, chlorination, and chloramination with HNP species has also been verified through computational modeling using density functional theory. The introduction of nitro group onto HNPs significantly diminishes the electron density of the benzene ring, thereby reducing their inherent reactivity compared with other aromatic DBPs. The hydrolysis and chlorination of HNPs primarily result in the formation of halogenated hydroquinones and various polyhaloquinones and polyhalophenols, respectively. These results suggest that HNPs and their transformation products exhibit relatively high persistence and exposure risks.
研究领域:
环境科学
·
饮用水安全
·
毒理学
✓ 已验证
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）