CARBON
·
2016
·
IF 6.198
Juhong Zhan,Huijiao Wang,Xuejun Pan,Jinlin Wang,Gang Yu,Shubo Deng,Jun Huang,Bin Wang,Yujue Wang
This study investigated the regeneration of p -nitrophenol (PNP) saturated activated carbon fiber (ACF) by a novel electro-peroxone (E-peroxone) approach, which aimed to simultaneously regenerate exhausted ACF and mineralize desorbed pollutants by coupling conventional cathodic regeneration with ozonation . PNP-saturated ACF was attached to a carbon-polytetrafluorethylene cathode, which was then applied a current to drive cathodic desorption of pre-loaded PNP and electrochemical generation of H 2 O 2 from O 2 in the sparged ozone generator effluent (O 2 and O 3 gas mixture). The electro-generated H 2 O 2 then reacts with sparged O 3 to yield OH, which can rapidly mineralize the desorbed pollutants (PNP and its derivatives). After 3 h regeneration, the E-peroxone process restored ∼95% of the ACF adsorption capacity , and effectively mineralized the desorbed pollutants. In addition, the E-peroxone regeneration did not considerably modify the structural and chemical properties of ACF. Consequently, the ACF exhibited no evident decline in the adsorption capacity after twelve cycles of PNP adsorption and E-peroxone regeneration. These results indicate that the E-peroxone regeneration can successfully achieve the goal of simultaneous regeneration of saturated ACFs and mineralization of desorbed pollutants, and may thus provide an attractive and viable alternative for the regeneration of organic-saturated ACs.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Fei Li,Xia Zhang,Feng Liang,Chen Wang,Pingning Jin,Jing Fan
Nano zero-valent iron (nZVI) has remarkable reactivity, but its practical application is severely hindered by its easy aggregation and rapid oxidation after exposure in air. In this study, spherical porous calcium tartrate (CaTr) was synthesized with ultrasound technology and used to support nZVI. It was found that the as-obtained nZVI@CaTr was highly stable and reactive in oxygen-rich water under neutral/alkaline conditions. In the pH range of 4–9, the degradation efficiency of p-nitrophenol (PNP, 50 mg/L) by nZVI@CaTr 7 exceeded 98.1 %. Importantly, nZVI@CaTr could be stored in air for a long time without inert gas protection. After 60 days and 120 days of air exposure, the removal efficiency of PNP still reached 83.3 % and 63.3 %, which was 2.8 and 9.7 times that of bare nZVI, respectively. Such an excellent performance could be attributed to two reasons: (i) spherical CaTr effectively inhibited the oxidation and aggregation of nZVI by favorable interactions with nZVI, and (ii) the abundant functional groups on the surface of CaTr acted as electronic mediators to significantly promote charge transfer between nZVI (electron donor) and PNP (electron acceptor). Therefore, cheap, air stable and highly effective nZVI@CaTr 7 provided a potential application prospect for the degradation of environmental pollutants in aerobic environment and alkaline wastewater.
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
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2019
·
IF 4.527
Jinchao Wei,Lele Yang,Mai Luo,Yitao Wang,Peng Li
A novel dual-mode analytical method by employing nanozyme was developed for the detection of organophosphorus pesticides (OPP) for the first time. The detection principle is that the pesticide could be hydrolyzed to para-nitrophenol (p-NP) in the presence of nanoceria as nanozyme. p-NP exhibits the bright yellow color, and its color intensity has a positive correlation with the pesticide concentration. Meanwhile, the characteristic absorption peak at 400 nm of p-NP increases gradually with the raised concentration of pesticide. Therefore, a dual-mode method including smartphone-based colorimetric and spectroscopic strategies was rationally developed. Herein, methyl-paraoxon was selected as the representative compound. Under the optimum conditions, the detection limits of both two strategies were calculated to be 0.42 μmol L −1 . Finally, the present method was successfully applied in three edible medicinal plants (Semen nelumbinis, Semen Armeniacae Amarum, Rhizoma Dioscoreae ). The present work offers a reliable and convenient approach for routine detection of pesticide based on two different detection mechanisms.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small Methods
·
2023
·Vol. 7
·期 6
·2300302
·
IF 12.4
Ling Lei,Jiaxi Yin,Kangbing Wu,Nianjun Yang
2D MXenes are widely proved to be potential electrode materials, although the size effect on their electrochemistry is not fully understood. In this work, Ti 3 C 2 T x nanoflakes are prepared through acidic etching of Ti 3 AlC 2 powders, followed by the intercalation treatment with tetrapropylammonium hydroxide. Such a method produces large-scale delaminated and oxygenated nanoflakes. With aid of centrifugation, the nanoflakes with varied lateral sizes and thicknesses are collected, where electrochemical response of charged redox probes and polar phenol molecules is varied. Density functional theory and energy dispersive spectroscopy confirm such electrochemical response is dependent on the size and thickness of used nanoflakes, more exactly the oxygen content on their surface. Taking the nanoflakes obtained using a centrifugal speed of 5000 rpm (MX-TPA 0.2 ) as an example, they feature good dispersibility, a high oxygen content, a small size, and a thin thickness. On these nanoflakes electrochemical response of polar p -substituted phenols is pronounced, stemming from a strong electron-withdrawing interaction of their oxygenated termination with the Ar-OH. A sensitive electrochemical sensor is further constructed for the detection of p -nitrophenol. This work thus provides an approach to synthesize MXenes with different sizes and thicknesses as well as further to reveal size-dependent electrochemistry of MXenes.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
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
International Journal of Electrochemical Science
·
2023
·Vol. 11
·期 12
·9868-9880
·
IF 1.5
Hongying Li,Xueliang Wang,Tao Wang,Zhaoxia Wang,Wei Zhao
A modified electrode was fabricated by casting graphene oxide (GO) suspension onto the surface of active glassy carbon electrode (GCE), and it can significantly enhanced the oxidation peak currents of m-trihydroxybenzene (m-THB) and p-nitrophenol (p-NP). Based on this, a sensitive analytical method towards their simultaneous determination was established. Many influencing factors such as the type of electrolyte, acidity, scan rates and concentrations were explored. Under the optimal experimental conditions, the oxidation peak currents of m-THB and p-NP were linearly increased with their concentrations ranging from 9 to 100 μM, with the detection limits both of 1 μM. Comparing with other reported methods, this sensor showed wider linear range and lower detection limit. In addition, the proposed method was successfully used to analysis of real environmental water samples with satisfactory recoveries, which verified the practicability of the sensor.
研究领域:
分析化学
·
环境科学
·
电化学
·
传感器技术
·
污染物检测
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 186
·期 1
·1-8
·
IF 5.705
Hu Yanling,He Yu,Han Yaxue,Ge Yili,Song Gongwu,Zhou Jiangang
A rapid method is described for synthesis of copper nanoclusters (CuNCs) by utilizing L-histidine as the stabilizer and ascorbic acid (AA) as the reductant. The CuNCs display blue-green fluorescence with excitation/emission peaks at 390/485 nm. A sensitive fluorometric assay was worked out for determination of alkaline phosphatase (ALP) activity. If the ALP substrate p-nitrophenylphosphate (PNPP) is enzymatically hydrolyzed, it forms p-nitrophenol (PNP) which reduces the fluorescence of CuNCs because its absorption band at 410 nm overlaps the excitation peak of CuNCs at 390 nm. In addition, the amino groups and imidazole groups on the surface of CuNCs possibly form a complex with the phenol groups of PNP. This induces aggregation-induced quenching of the fluorescence of CuNCs. The fluorescent probe has a linear analytical range that extends from 0.5 mU·mL −1 to 40 mU·mL −1 and a detection limit of 45 μU·mL −1 .
Schematic illustration of a fluorometric assay for alkaline phosphatase (ALP) activity that uses L-histidine protected copper nanoclusters (CuNCs), aggregation-induced quenching, and the inner filter effect between PNP and CuNCs.
研究领域:
分析化学
·
生物化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2019
·Vol. 36
·期 6
·942-953
·
IF 2.476
Rong Yachan,Han Runping
Magnetic activated carbon (MAC) was prepared by co-precipitation. These particles had attractive adsorption capacity and could be easily separated from aqueous. MAC was used as adsorbent to remove p -chlorophenol ( p -CP) and p -nitrophenol ( p -NP) from solution in single and binary systems. In a single system, the equilibrium time was 60 min, the best initial pH was 3-8 and 3-6 for p -CP or p -NP adsorption, respectively. The existence of salt ions had little influence on the adsorption process, while surfactant had negative influence. The adsorption quantity from experiments was up to 97.3 mg·g −1 for p-CP and 116 mg·g −1 for p -NP at 293 K, respectively. Freundlich model and pseudo-second-order kinetic model fitted well the adsorption behavior. Thermodynamic parameters were calculated and the results showed that the process was spontaneous, exothermic and entropy production in nature. In addition, p -CP or p -NP-loaded MAC could be well reused by 0.01 mol·L −1 sodium hydroxide solution as regeneration agent. Kinetic process of desorption was fitted best by pseudo-second-order kinetic model. Results from the binary system showed that competitive adsorption existed during the process, and p -NP adsorption on MAC was easier than p -CP. Freundlich model well fitted the adsorption behavior in the binary system. Hydrogen-bonding, electron donor-acceptor and π-π interactions may be the main mechanisms of adsorption. MAC proved to be an excellent adsorbent for the removal of p -CP and p -NP from solution.
研究领域:
环境科学
·
化学工程
·
水处理
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yining Chang,Ran He,Runqiu Wang,Yanli Wei,Li Wang
Nitrophenols are manufactured chemicals used in making industrial products and released from auto exhaust. Once nitrophenols enter the soil, the phytotoxicity causes forest decline. Exposure to nitrophenols will result in adverse health effects, such as cataracts, cyanosis and potential carcinogenicity. Based on structural matching, this study describes a sensing system of 2-hydroxylpropyl-β-cyclodextrin (HP-β-CD) modified sulphur quantum dots (HP-SQDs) for the selective detection of para-nitrophenol (p-NP). HP-SQDs are synthesized by the assembly fission method. The cyclodextrin-based molecular cages detected p-NP selectively by fluorescence quenching, which resulted from the structural matching and photoinduced electron transfer (PET) between p-NP and HP-β-CD. The inclusion of nitrophenols in cyclodextrin cages causes the decreased fluorescence intensity of HP-SQDs, with the detection limit of 0.25 μmol L−1 for p-NP. The theoretical calculation of the binding energy and inclusion constant between HP-β-CD and nitrophenols reveals the high selectivity of p-NP over other isomers by HP-SQDs. This fluorescent cage sensing approach provides a new idea for the identification of isomers.
研究领域:
环境化学
·
分析化学
·
材料科学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2018
·Vol. 143
·期 21
·5185-5190
·
IF 3.864
Yunlei Zhou,Huanshun Yin,Yue Wang,Chengji Sui,Minghui Wang,Shiyun Ai
A simple and sensitive electrochemical aptasensor was constructed for zeatin detection, where MoS2 nanosheets were used as the immobilization matrix for gold nanoparticles (AuNPs), and AuNPs were employed as the immobilization matrix to probe DNA. After the aptamer DNA and assist DNA hybridized with probe DNA, Y-type DNA can be formed with two biotins at the terminals of aptamer DNA. Then, avidin modified alkaline phosphatase (Avidin-ALP) can be further modified on the electrode surface through the biotin and avidin interaction. Under the catalytic effect of ALP, p-nitrophenylphosphate disodium (PNPP) can be hydrolyzed to produce p-nitrophenol (PNP). However, in the presence of zeatin, the formed Y-type DNA can be destroyed due to the formation of the zeatin–aptamer conjugate, which further reduces the amount of PNP and leads to the decrease of the oxidation signal of PNP. Under the optimum conditions, the change of the oxidation peak current of PNP was inversely proportional to the logarithm value of zeatin concentration in the range of 50 pM–50 nM. The detection limit was calculated to be 16.6 pM. This electrochemical method also showed good detection selectivity and stability. The potential applicability of this method was proved by detecting zeatin in real samples.
研究领域:
分析化学
·
生物化学
·
电化学
·
纳米技术
✓ 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）