ENVIRONMENTAL TECHNOLOGY
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2023
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IF 2.8
Chen-Yan Hu,Cun Xiong,Yi-Li Lin,Tian-Yang Zhang
The degradation kinetics, reaction pathways, and disinfection by-products formation of an organic UV filter, benzophenone-4 (BP4) during UV/persulfate oxidation were investigated. BP4 can hardly be degraded by UV alone, but can be effectively decomposed by UV/persulfate following pseudo-first order kinetics. BP4 degradation rate was enhanced with increasing persulfate dosage and decreasing pH from 8 to 5. However, the degradation rate of BP4 at pH 9 was higher than that at pH 8 because of the presence of phenolic group in BP4 structure. and SO4−⋅ were confirmed as the major contributors to BP4 decomposition in radical scavenging experiments, and the second-order rate constants between HO⋅ and BP4 as well as those between SO4−⋅ and BP4 were estimated by establishing and solving a kinetic model. The presence of Br− and humic acid inhibited the decomposition of BP4, while NO3− promoted it. The mineralisation of BP4 was only 9.1% at the persulfate concentration of 50 μM. Six degradation intermediates were identified for the promulgation of the reaction pathways of BP4 during UV/persulfate oxidation were proposed as a result. In addition, the formation of DBP in the sequential chlorination was evaluated at different persulfate dosages, pH values, and water matrix. The results of this study can provide essential knowledge for the effective control of DBP formation with reducing potential hazard to provide safe drinking water to the public.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Ahmed I. El-Tantawy,Shimaa M. Elsaeed,Rana R. Neiber,Wael H. Eisa,Abdel Aleem H. Abdel Aleem,Ahmed A. El-Hamalawy,Mai S. Maize
Two novel mono- and bis-thioureidophosphonate cores (referred by MTP & BTP, respectively) were facilely synthesized in ionic liquid conditions and incorporated with silver nanoparticles (Ag NPs) via in-situ reduction method giving two heterogeneous nanocatalysts, denoted as Ag NP/MTP and Ag NP/BTP, respectively. X-ray diffraction (XRD), ultraviolet-visible (UV–Vis), and high-resolution transmission electron microscopy (HR-TEM) tools were conducted for the as-fabricated Ag NP/TP nanocomposites revealing the good dispersion of Ag NPs in spherical black dots with average size ranges of (∼9.5–12.7 nm) and (∼17.0–22.5 nm) for Ag NP/MTP and Ag NP/BTP, respectively. The Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) techniques clarified that, MTP possessing (P O Ph, P O, C=S, HC O, and >NH) functionalities were participated in the reduction of Ag + ions to Ag 0 NPs. The catalytic properties of both Ag NP/TP nanocomposites were verified through the chemical conversion of 4-nitrophenol (4-NP) to less hazardous 4-aminophenol (4-AP) comparable to the slight catalytic reduction of Ag NPs-free TP derivatives. To assess the catalytic performance, some kinetic parameters such as rate constant (K app ), normalized rate constant (K nor ), and turnover frequency (TOF) were estimated at the highest concentration of 4-NP. Accordingly, Ag NP/MTP exhibited more remarkable catalytic activity and durability toward 4-NP reduction than that of Ag NP/BTP. The simple stereochemistry and accessibility of active sites for MTP tuned the surface function with Ag + ions, affording more stable and regular Ag NPs over the same nanoparticle with BTP. Regarding Ag NP/MTP, catalytic improvement rates to 69%, 64%, and 69% were respectively recorded for K app , K nor , and TOF over Ag NP/BTP. Moreover, both nanocatalysts demonstrated good surficial stability through 10 consecutive cycles. Herein, this study has provided a new sustainable route for developing new TP-wrapped metal nanocomposites as robust and selective platforms in catalytic and environmental applications.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Ji Xiang,Chuancui Yang,Ke Yang,Jin Qian,Yanzhen Lu,Qihua Zhou,Fangkuo Wang
As catalysts, metal nanoclusters (NCs) have become the focus of research due to their precise structure and excellent catalytic activity. In general, it can greatly improve the catalytic activity of NCs by thermal treatment. In this work, the ZnO supported 2,4-dimethylbenzenethiol-protected-[Ag 25 (C 8 H 9 S) 18 ] - NCs (Ag 25 @ZnO) nanocatalysts were subjected to activation temperatures of 100 °C, 200 °C and 300 °C to remove the surface ligands of Ag 25 NCs and regulate the surface composition of Ag 25 @ZnO nanocatalysts. The structure of Ag 25 @ZnO nanocatalysts were characterized by XRD , SEM, TEM, EDS and XPS. In particular, the XPS results obviously confirmed that the concentration of Ag + on the catalyst surface was positively correlated with the activation temperature. Finally, the effect of the Ag + content on the catalytic activity of the Ag 25 @ZnO nanocatalysts was also explored. Because the content of Ag + in Ag 25 @ZnO-300 nanocatalysts is the highest, the 4-nitrophenol reduction reaction showed the best catalytic performance.
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Molecular Catalysis
·
2023
·
IF 4.6
Xuewu Ji,Guirong Bao,Peng Gao,Jia Luo,Dequan Chen,Zhen Fang
Vanillin hydrodeoxygenation (HDO) was studied in water and methanol using palladium-decorated carbon dots (Pd/CDs). The catalyst was synthesized from photo-reduction of palladium acetate using CDs as the reducing and dispersion agent, while CDs were produced via microwave treatment of glucose and urea. Pd/CDs were characterized with XRD, TEM, FT-IR, XPS, BET and ICP-OES. The selectivity to 2‑methoxy-4-methylphenol (MMP), at vanillin conversion of 100 % after 4.0 h was 98.8 % at 140 °C under 4.0 MPa of H 2 in water with 4.58 wt.% of Pd/CDs. The stability of Pd/CDs was also investigated after four times recycle under the optimal reaction conditions. CDs supported Pd reduced with NaBH 4 and hydrazine hydrate (Pd/CDs-S and Pd/CDs-H) and other carbonaceous materials (active carbon and OH functionalized multi-walled carbon nanotube) supported Pd (Pd/AC and Pd/CNTs) were also investigated for comparison. The highest selectivity to MMP achieved by Pd/CDs produced via photoreduction brings a novel use of this type of catalyst in the conversion of biomass into value-added chemicals and materials.
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Gels
·
2023
·Vol. 9
·期 12
·978
·
IF 4.6
Qianqian Yu,Xiaohan Sun,Feng Liu,Zhaolin Yang,Shulei Wei,Chengyu Wang,Xin Li,Zechen He,Xiaodong Li,Yudong Li
The advancement of science and technology and the growth of industry have led to an escalating discharge of domestic sewage and industrial wastewater containing dyes. This surge in volume not only incurs higher costs but also exacerbates environmental burdens. However, the benefits of green and reusable catalytic reduction materials within dye processes are still uncertain. Herein, this study utilized the eco-friendly deep eutectic solvent method (DESM) and the chlorite-alkali method (CAM) to prepare a cellulose-composed wood aerogel derived from natural wood for 4-nitrophenol (4-NP) reduction. The life cycle assessment of wood aerogel preparative process showed that the wood aerogel prepared by the one-step DESM method had fewer environmental impacts. The CAM method was used innovatively to make uniform the chemical functional groups of different wood species and various wood maturities. Subsequently, palladium nanoparticles (Pd NPs) were anchored in the skeleton structure of the wood aerogel with the native chemical groups used as a reducing agent to replace external reducing agents, which reduced secondary pollution and prevented the agglomeration of nanoparticles. Results showed that the catalytic reduction efficiency of 4-NP can reach 99.8%, which shows promises for applications in wastewater treatment containing dyes. Moreover, investigation of the advantages of preparation methods of wood aerogel has important implications for helping researchers and producers choose suitable preparation strategies according to demand.Keywords:wood aerogel;deep eutectic solvents;chemical properties standardization;dye reduction;life cycle assessment;mulberry branch
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 27
·e54005
·
IF 3
Fuchun Wang,Jiexiong Wang,Wei Ma,Bingtao Tang,Shufen Zhang
A kind of copolymer, poly(4-vinylsulfonylaniline- co -acrylamide) (P(VSA- co -AM)), was synthesized by the copolymerization of 4-vinylsulfonyl aniline (VSA) and acrylamide (AM) using tetrahydrofuran (THF) as the solvent and 2,2′-azobis(2-methylpropionitrile) (AIBN) as the initiator in the presence of a total monomer mass concentration of 15%, and a polymerization duration of 10 h. The effect of the monomer feed ratio on the copolymerization is investigated, and the results reveal that increasing the content of VSA in the monomer feed ratio increases the proportion of VSA in the copolymer. A feed ratio of 5:5 is selected for the copolymerization of VSA and AM, and a copolymer with 28% VSA is obtained. After diazotization, P(VSA- co -AM) with a molecular weight of 4.45 × 10 3 and a VSA ratio of 28% is coupled with the coupling component containing more chloro-s-triazine reactive groups, thus resulting in macromolecular reactive dyes. The fixation of the obtained macromolecular reactive dyes A, B, and C on cotton fabric is over 93% and have good light, rubbing, and washing fastnesses, thus indicating their potential application in the dyeing of cotton fabric.
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VACUUM
·
2023
·
IF 4
Pengfei Zhu,Hua Fang,Yanli Zhu,Jinqiang Zhou,Xueyong Guo
Ammonium perchlorate-based molecular perovskites (DAP-4) have garnered immense interest due to their exceptional burst performance and good thermal stability. Similarly, metallic hydrides are widely acknowledged as an exceedingly promising material class for implementation in energetic systems, given their exceptional hydrogen storage density. Therefore, it is crucial to investigate the impact of hydrogen storage material MgH 2 on the thermal decomposition and combustion characteristics of molecular perovskite materials ((H 2 dabco)[NH 4 (ClO 4 ) 3 ],DAP-4). In this study, DAP-4/MgH 2 composites were synthesized and characterized for their morphology, structure, elemental distribution, thermal decomposition properties, and combustion properties. The findings indicated that the inclusion of MgH 2 reduce the thermal decomposition temperature of DAP-4. Moreover, when MgH 2 was added at a mass ratio of 5 wt %, the apparent activation energy ( E a ) decreased to 212.0 kJ/mol, while the peak combustion pressure and boosting rate increased with more intense flames. A plausible thermal decomposition and combustion mechanism of DAP-4/MgH 2 composites was postulated. This study enhances our understanding of the thermal decomposition and combustion properties of DAP-4 and magnesium hydride in energy-containing systems.
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FOOD AND CHEMICAL TOXICOLOGY
·
2023
·
IF 4.3
Kaixuan Li,Guode Zhao,Lan Yang,Xingyu Gao,Yudi Jia,Yang Wang,Xiaohong Zhang,Weiwei Li,Ying Peng,Jiang Zheng
4-Methylquinoline (4-MQ) is a quinoline derivative widely present in groundwater and soil and has been reported to be genotoxic. The mechanisms of the toxic action remain unknown. This study aimed to elucidate the metabolic activation of 4-MQ and to determine the possible role of reactive metabolites in 4-MQ-induced liver injury in rats. In the present study, a hydroxylation metabolite (M1), a GSH conjugate (M2) and an NAC conjugate (M3) derived from 4-MQ were detected in vitro and in vivo . The structures of the two conjugates were verified by chemical synthesis, mass spectrometry, and nuclear magnetic resonance. CYP3A4 was found to dominate the hydroxylation of 4-MQ. Sulfotransferases also participated in the metabolic activation of 4-MQ. Pretreatment of primary hepatocytes with ketoconazole (KTC) or 2,6-dichloro-4-nitrophenol (DCNP) not only reduced the production of GSH conjugate M2 but also decreased the susceptibility of hepatocytes to the cytotoxicity of 4-MQ. Urinary NAC conjugate M3 was found in rats given 4-MQ, and M3 may be a potential biomarker for 4-MQ exposure.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Huanhuan Sun,Hongyan Yu,Boyang Han,Junjie Ma,Rensheng Wang,Yanping Song
Pressure-induced surface-enhanced Raman spectroscopy (PI-SERS) is among the foremost achievements of high-pressure fields, benefiting from the advantage that pressure-modulated interactions between substrates and molecules overcome the weakness of individual substrates or molecules. However, the pressure corresponding to PI-SERS enhancement is currently still at a low-pressure stage within 8 GPa. Therefore, how to realize PI-SERS enhancement under higher or ultrahigh pressure remains a huge challenge. Here, we applied few-layer WS2 (FL-WS2) nanosheets as PI-SERS substrates and selected 4-mercaptobenzoic acid (4-MBA) molecules with a big energy gap as probes to explore PI-SERS enhancement in more depth. The experimental results indicate that the PI-SERS signals increase gradually as pressure increases and reaches a maximum at 18 GPa, which has set a pressure record for the PI-SERS field so far. Different from the C exciton resonance-induced SERS intensities at ambient conditions, the charge-transfer transition between FL-WS2 and 4-MBA is strengthened via the pressure-induced increase in the band gap of FL-WS2 and decrease in the highest-occupied molecular orbital–lowest unoccupied molecular orbital (HOMO–LUMO) energy gap of 4-MBA, thus enhancing PI-SERS signals accordingly. Therefore, this strategy will be beneficial for practical applications in the field of optoelectronics and for the design of other PI-SERS sensors for trace detection in complex and extreme environments.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Mingjie Han,Yuhao Xu,Ri Wang,Yong Xie,Yuekun Wang,Chao Bian,Shanhong Xia
Mercury ions (Hg2+) are highly toxic, which can contaminate the environment and cause serious harm to human health. In this work, we report a portable, high-performance, and reusable boron-doped diamond (BDD) electrochemical sensor, which takes the advantages of 4-mercaptopyridine-functionalized gold nanoparticles (4-MPY/Au NPs) as the sensing element. Due to the specific coordination between Hg2+ and nitrogen of pyridine, Hg2+ can be captured by the 4-MPY to form a Hg(pyridine)2 complex, which leads to the reduction of electrochemical activity at the electrode surface. The current variations are monitored by differential pulse voltammetry (DPV) in solution containing the [Fe(CN)6]3–/4– redox probe. Under optimal conditions, the proposed sensor exhibits an excellent logarithmic relationship in the range of 0.001–10 μg/L with a low limit of detection (LOD) of 0.358 ng/L. In addition, the sensor is validated with satisfactory recovery of tap water samples, demonstrating its potential for on-site monitoring of the water environment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Jingna Liu,Bingqing Chen,Qianyi Hu,Qiong Zhang,Bingqing Huang,Peng Fei
To augment the functional attributes of pectin and expand its prospective utilization in food preservation, this research explored the enzymatic grafting of resorcinol and 4-hexylresorcinol onto pectin. Structural analysis verified the successful grafting of both resorcinol and 4-hexylresorcinol to pectin via esterification , with the 1-OH of resorcinol and 4-hexylresorcinol and the carboxyl group of pectin functioning as grafting sites. The grafting ratios of resorcinol-modified pectin (Re-Pe) and 4-hexylresorcinol-modified pectin (He-Pe) were 17.84 % and 10.98 %, respectively. This grafting modification notably enhanced the antioxidative and antibacterial properties of pectin. Specifically, DPPH clearance and the inhibition ratio in the β-carotene bleaching assay increased from 11.38 % and 20.13 % (native pectin, Na-Pe) to 41.15 % and 36.67 % (Re-Pe), and 74.72 % and 53.40 % (He-Pe). Moreover, the inhibition zone diameter against Escherichia coli and Staphylococcus aureus rose from 10.12 and 10.08 mm (Na-Pe) to 12.36 and 11.52 mm (Re-Pe), and 16.78 and 14.87 mm (He-Pe). Additionally, the application of native and modified pectin coatings effectively impeded pork spoilage, with the modified pectins demonstrating a more potent effect. Among the two modified pectins, He-Pe exhibited the most significant enhancement in pork shelf life.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Weichao Xu,Yuxuan Yi,Kunhao Guo,Anming Li,Xuehan Zhang,Feng Guo
The combination of photocatalysis and enzyme catalysis makes many previously difficult or slow chemical reactions easy to realize. A novel [email protected] −C 3 N 4 biohybrid catalyst was successfully synthesized using a simple in situ synthesis method to remove 4- tert -butylphenol (4- t -BP). A series of characterization methods were used to investigate the structure, morphology, chemistry, and optical properties of biohybrid catalysts. [email protected] −C 3 N 4 has improved photogenerated electron-hole pair separation efficiency and charge carrier mobility , as well as photocatalytic activity, with a removal rate of 4- t -BP nearly 100% within 180 min. The catalyst recycling test revealed that the composite could maintain its high removal efficiency after 10 recyclings. Meanwhile, the photocatalytic mechanism investigation reveals that ∙O 2 − play critical roles in the removal of 4- t- BP by g−C 3 N 4 . A detailed examination of the mechanism and pathway of 4- t -BP removal by photoenzyme oxidation was also carried out. This biohybrid catalyst opened up a new avenue for the advancement of environmental protection technology .
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