ACS Applied Polymer Materials
·
2025
·
IF 4.7
Xin Yi,Yujiao Li,Meichen Liu,Xin Peng,Xi Wang,Chunwang Yi
The recycling treatment of plastic products faces significant challenges. Polyamide 6 (PA6), as extensively researched and industrially recycled plastic material, has a high pollution emission rate from traditional treatment methods and can not solve the problem at the root, so it is necessary to develop a new catalyst for the chemical recycling of PA6. In this paper, the degradation effect of the new solid phosphoric acid (SPA) on PA6 was systematically investigated, and the results showed that, compared with other homogeneous catalysts, the SPA showed a better catalytic effect in the target monomer recovery and meanwhile avoided reaction device corrosion, which was more in line with green recycling and environmental protection needs. Compared with the noncatalyst condition, the complete hydrolysis time of PA6 was shortened from more than 10 to 6 h after adding SPA at 220 °C. The recovery of the monomer ε-caprolactam after hydrolysis catalyzed by SPA was also higher under the same reaction time, and the monomer yield reached 77% at 10 h. The catalyst demonstrated excellent recyclability after generation with poly(ethylene glycol) (PEG-400), maintaining high PA6 degradation rates (95%) and the monomer yield (65%) over several generations. Therefore, this solid phosphoric acid catalyst provides a different idea for the high-value recycling of PA6.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2024
·Vol. 112
·期 1
·152-161
·
IF 2.3
Zhang Enlei,Chen Jiaojiao,Xu Rui,Song Xiaowen,Zhang Bengui,Wang Guosheng
Catalytic reduction of 4-nitrophenol (4-NP) into 4-aminophenol (4-AP) is an important method for treating toxic nitroaromatic pollutant. In this work, amorphous CoSn(OH) 6 nanocubes were synthesized by coprecipitation and calcination methods for 4-NP photocatalytic reduction. The crystal structure, morphology and optical property of the samples were characterized by XRD, SEM, TEM, XPS, and UV–vis DRS. The amorphous CoSn(OH) 6 nanocubes showed excellent photocatalytic performance in 4-NP reduction. The effects of catalyst dosage, 4-NP concentration, and sodium borohydride concentration on the conversion rate of 4-NP were investigated. The results showed that the conversion rate of 4-NP could reach 98.38% in 15 min at room temperature under visible light irradiation. After five cycles of experiments, the conversion rate of 4-NP remained above 90%, indicating the good catalytic stability of the amorphous CoSn(OH) 6 nanocubes. Finally, the mechanisms of photocatalytic reduction on amorphous CoSn(OH) 6 nanocubes are also discussed. The successful preparation of amorphous CoSn(OH) 6 nanocubes may enable the widespread use of amorphous polymetallic oxides for the removal of nitrophenols from wastewater in the future. Graphical Abstract Amorphous CoSn(OH) 6 nanocubes exhibit superior photocatalytic reduction 4-NP to 4-AP performance.
研究领域:
材料科学
·
环境科学
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Pei-hui Shan,Tai-bai Jiang,Hang Zhao,Xiao-yan Wu,Carl Redshaw,Zhu Tao,Xin Xiao
The interaction between 1-(2-hydroxyphenyl)piperazine (HPP) and cucurbit[6]uril (Q[6]) has been explored via 1 H NMR spectroscopy and X-ray crystallography. The results show that the guest molecule 1-(2-Hydroxyphenyl)piperazine hydrochloride is not encapsulated within the Q[6] cavity in both aqueous solution and the solid state. Instead, it resides at the portal of Q[6], forming a highly stable exclusion complex, designated HPP 2 @Q[6]. Notably, ion-dipole and hydrogen-bonding interactions play key roles in stabilizing this complex.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhengang Zhou,Junjie Zheng,Lingyu Shao,Xiao Zhang,Chengjin Pan,Xiuqi Hu,Kai Feng,Hao Song,Shihan Zhang,Chenghang Zheng,Xiang Gao
Catalytic solvent regeneration has garnered significant attention due to its capacity to lower energy demands in industrial processes, promoting broader adoption of carbon capture systems. While progress has been made in catalyst engineering, creating efficient solid acid catalysts still encounters critical obstacles such as synthesizing mesoporous architectures with extensive surface areas and improving the spatial arrangement of active sites. Herein, this study developed a Ni/Fe@KIT-6 catalyst with ordered porosity and dual metal acid sites, leveraging the three-dimensional cubic pore structure of mesoporous silica to enhance liquid-solid mass transfer. The anchored Ni/Fe clusters synergistically enhanced proton transfer, reducing the activation energy of carbamate decomposition through optimized intermediate adsorption configurations. Catalytic testing revealed a 58.1 % enhancement in CO₂ desorption efficiency alongside a 41.2 % decrease in energy requirements relative to non-catalytic systems. The material maintained stable performance across multiple absorption-desorption cycles (efficiency decline <10 %), linked to the KIT-6 framework's retained structural stability and optimized metal-support bonding. Theoretical calculations revealed that the Ni/Fe dual sites lowered the CO 2 desorption reaction energy barrier, aligning with the enhanced CO₂ desorption efficiency. This synergistic interaction of dual metal acid sites within a high-surface-area architecture highlights viable pathways for scalable and energy-efficient CO₂ desorption, thereby advancing practical strategies for large-scale deployment of carbon capture technologies.
研究领域:
催化化学
·
碳捕集与封存
·
材料科学
·
化学工程
·
环境科学
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Dongqing Liu,Zexian Zhu,Yiping Zhao,Yingbo Chen,Yankun Tan,Yufeng Zhang
A co-polymer (SPAA6) of 5-sulfoanthranilic acid (5SAA) and ε -caprolactam was used to prepare membrane through nonsolvent induced phase separation (NIPS) method. The micro-structure of membrane was adjusted by small molecules to improve mechanic strength and performance, involving 7 commercial ionic surfactant and a self-synthesized one, S20. S20 showed the best compatibility with SPAA6, which converted spherical phase into network of strip-like units in micro-structure of membrane. Meanwhile, average pore size of the membrane was narrowed from 4.271 nm to 3.391 nm, tested by BET method. Tensile strength of membrane was improved from 2.5 MPa to 2.9 MPa. Therefore, anionic dyes rejection and membrane stability were both improved. It actually demonstrated that molecular weight distribution of SPAA6 was crucial for micro-structure construction of membrane since S20 was the SPAA6 of low molecular weight . In blend solution filtration test, membrane MS2 (1:2 for S20:SPAA6) displayed 98.22% rejection to Congo Red (CR) acid and 96.18% NaCl permeation under 1 bar. It showed 80.18% rejection to chrome blue K (ABK) and 96.28% NaCl permeation. Both water permeance were higher than 3.5 L·m −2 ·h −1 ·bar. Membrane MS2 showed the potential of fractionation of dye and NaCl, which was promising in textile waste water treatment .
研究领域:
材料科学
·
环境工程
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Antioxidants
·
2022
·Vol. 11
·期 11
·2098
·
IF 7.675
Na Wang,Weixuan Chen,Chenxu Cui,Yuru Zheng,Qiuying Yu,Hongtao Ren,Zhigang Liu,Chao Xu,Gaiping Zhang
Polyphenols from peanut skin have been reported to possess many beneficial functions for human health, including anti-oxidative, antibacterial, anticancer, and other activities. To date, however, its anti-inflammatory effect and the underlying mechanism remain unclear. In this study, the anti-inflammatory effect of peanut skin procyanidins extract (PSPE) and peanut skin procyanidins (PSPc) were investigated by a dextran sodium sulfate (DSS)-induced colitis mouse model. The results showed that both PSPE and PSPc supplementation reversed the DSS-induced body weight loss and reduced disease activity index (DAI) values, accompanied by enhanced goblet cell numbers and tight junction protein claudin-1 expression in the colon. PSPE and PSPc treatment also suppressed the inflammatory responses and oxidative stress in the colon by down-regulating IL-1β, TNF-α, and MDA expressions. Meanwhile, PSPE and PSPc significantly altered the gut microbiota composition by increasing the relative abundance ofClostridium XlVbandAnaerotruncus, and inhibiting the relative abundance ofAlistipesat the genus level. PSPE and PSPc also significantly elevated the production of short-chain fatty acids (SCFAs) in mice with colitis. The correlation analysis suggested that the protective effects of PSPE and PSPc on colitis might be related to the alteration of gut microbiota composition and the formation of SCFAs. In conclusion, the current research indicates that supplementation of PSPE and PSPc could be a promising nutritional strategy for colitis prevention and treatment.Keywords:peanut skin;procyanidins;DSS-induced;ulcerative colitis
研究领域:
营养学
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免疫学
·
胃肠病学
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药理学
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高影响因子
Open Chemistry
·
2023
·Vol. 21
·期 1
·
IF 2.3
Aiyi Xin,Tingting Yang,Fang Peng,Zhiguo Wang
One-pot synthesis of polymerized methyl imidazole silver bromide (CH 3 C 6 H 5 AgBr) 6 Compound 1 was carried out by the reaction of methylimidazole, 1,2-dibromoethane, and Ag 2 O in tetrahydrofuran at 60°C for 2 h. Compound 1 was characterized by elemental analysis,
1
H nuclear magnetic resonance, and single crystal X-ray diffraction. The crystal cell parameters of Compound 1 are as follows: a = 8.916(4) Å, b = 17.655(9) Å, c = 9.024(4) Å, α = 90°, β = 103.621(7)°, γ = 90°, V = 1380.6(12) Å 3 , and Z = 4. The silver atoms in Compound 1 are pentacoordinated with three bromine atoms, one silver atom, and one nitrogen atom of methyl imidazole, and polymeric methyl imidazole silver bromide was formed based on this structure. The catalytic effects under optimized conditions were investigated in this study, and the results showed that Compound 1 possesses a strong catalytic effect on the oxidation of 2-methylnaphthalene with a conversion rate of 77.15% by using hydrogen peroxide as the oxidant at 80°C for 3 h. The catalytic mechanism was explored simultaneously.
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COLORATION TECHNOLOGY
·
2023
·Vol. 140
·期 2
·300-312
·
IF 1.8
Jianing Fan,Shouying Wu,Zixian Wang,Minglong Zheng,Miaomiao Zhang,Linping Zhang,Yi Zhong,Xiaofeng Sui,Hong Xu,Zhiping Mao
The discharge of coloured textile printing and dyeing wastewater causes environmental pollution. Disposing of wastewater efficiently, simply and with low consumption, is a problem that must be addressed. Herein, a catalytic method for rapid decolorisation of organic dyes was devised employing a terpyridine iron complex to activate oxidised permonosulphate. CI Acid Red 1 was used as the simulated pollutant, the influences of operating parameters on the fading effects of wastewater were explored. According to the results, the produced catalytic system exhibits a universal catalytic effect. Even when the dye concentration reaches 76.4 mg/L, the dyeing wastewater may be effectively decolorised. In addition, when anions (HCO 3 − , SO 4 2− , Cl − ) were present in the solution, the degradation effect of CI Acid Red 1 was still effective. Interestingly, active species such as sulphate radicals and singlet oxygen were detected in the catalytic degradation system by radical capture experiments. The removal rate of total organic carbon can achieve a percentage of 26.22% in 2 hours. This research provides a unique, enzyme-like catalytic system for the rapid breakdown of dye contaminants.
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Polymers
·
2023
·Vol. 15
·期 13
·2812
·
IF 5
Yingwei Zhang,Chunhua Wang,Yong Yi,Wenzhi Wang,Jun Yang
In order to adjust the properties of polyamide 6 (PA6) and expand its application, a new strategy of introducing an aromatic imide structure into the PA6 chain through the random copolymerization method is reported. The diimide diacid monomer was first synthesized by the dehydration and cyclization of pyromellitic dianhydride and 6-aminocaproic acid before it reacted with 1,6-hexamethylene diamine to form poly(amide imide) (PAI) salt, and finally synthesized PA6/PAI random copolymers containing an aromatic imide structure by the random copolymerization of ε-caprolactam and PAI salt. The introduction of an aromatic imide structural unit into the PA6 chain could have a great influence on its properties. As the content of PAI increases, the crystallinity (Xc) and melting temperature (Tm) of the PA6/PAI random copolymer gradually decrease, but its glass transition temperature (Tg) increases obviously. When the PAI content is 20 wt%, the copolymer PA6/PAI-20 has the best comprehensive performance and not only has high thermal stabilities but also excellent mechanical properties (high strength, high modulus, and good toughness) and dielectric properties (low dielectric constant and dielectric loss). Moreover, these properties are significantly superior to those of PA6. Such high-performance PA6 random copolymers can provide great promise for the wider applications of PA6 materials.Keywords:polyamide 6;poly(amide imide);random copolymerization
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Qiqi Quan,Zhiwei Liu,Zhaodong Li,Kangliang Pan,Anastasios Koidis,Yi Lei,Xiaoqin Yu,Qiuhua Mo,Xinan Huang,Hongtao Lei
6-Benzylaminopurine (6-BA), a plant growth regulator with cytokinin-like properties, was recently reported to be illegally used in bean sprouts to increase their commercial appearance. It is still nevertheless challenging to quickly detect this adulteration. In this work, four novel haptens (haptens 1–4) of 6-BA were rationally designed with computer-assisted modeling analysis and then synthesized for use as immunizing haptens to produce antibodies. One of two obtained antibodies showed high sensitivity and specificity toward 6-BA. Based on the most sensitive anti-6-BA antibody, an indirect competitive enzyme-linked immunosorbent assay (icELISA) was performed, which demonstrated a 50% inhibition concentration (IC50) of 1.18 μg/L and a limit of detection of 0.075 μg/L. The average recoveries of this icELISA for 6-BA of spiked samples ranged from 87.2 to 95.0% with a coefficient of variation of less than 8.7%. Furthermore, the blind samples were detected simultaneously by the method and HPLC-MS/MS, and the results showed good agreement with each other. Therefore, the proposed icELISA can facilitate the rapid surveillance screening of adulterated 6-BA in sprout vegetables.
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International Journal of Nanomedicine
·
2023
·
IF 8
Yaru Zou,Wei Gao,Huizhen Jin,Chenmei Mao,Yi Zhang,Xiaoling Wang,Dong Mei,Libo Zhao
Background Nanomedicines have significant advantages in enhancing the oral bioavailability of drugs, but a deeper understanding of the underlying mechanisms remains to be interpreted. Hence, the present study aims to explain the uptake and trafficking mechanism for 6-MP nanomedicines we previously constructed.Methods 6-MP loaded poly(lactide-co-glycolide) (PLGA) nanomedicines (6-MPNs) were prepared by the multiple emulsion method. The transcytosis mechanism of 6-MPNs was investigated in Caco-2 cells, Caco-2 monolayers, follicle associated epithelium (FAE) monolayers and rats, including transmembrane pathway, intracellular trafficking, paracellular transport and the involvement of transporter.Results Pharmacokinetics in rats showed that the area under the curve (AUC) of 6-MP in the 6-MPNs group (147.3 ± 42.89 μg/L·h) was significantly higher than that in the 6-MP suspensions (6-MPCs) group (70.31 ± 18.24 μg/L·h). The uptake of 6-MPNs in Caco-2 cells was time-, concentration- and energy-dependent. The endocytosis of intact 6-MPNs was mediated mainly through caveolae/lipid raft, caveolin and micropinocytosis. The intracellular trafficking of 6-MPNs was affected by endoplasmic reticulum (ER)-Golgi complexes, late endosome-lysosome and microtubules. The multidrug resistance associated protein 4 (MRP4) transporter-mediated transport of free 6-MP played a vital role on the transmembrane of 6-MPNs. The trafficking of 6-MPNs from the apical (AP) side to the basolateral (BL) side in Caco-2 monolayers was obviously improved. Besides, 6-MPNs affected the distribution and expression of zona occludens-1 (ZO-1). The transport of 6-MPNs in FAE monolayers was concentration- and energy-dependent, while reaching saturation over time. 6-MPNs improved the absorption of the intestinal Peyer’s patches (PPs) in rats.Conclusion 6-MPNs improve the oral bioavailability through multiple pathways, including active transport, paracellular transport, lymphatic delivery and MRP4 transporter. The findings of current study may shed light on the cellular uptake and transcellular trafficking mechanism of oral nanomedicines.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 12
·1-8
·
IF 5.705
Zhang Feng,Liu Hua,Liu Qing,Su Xingguang
A ratiometric fluorescence method is described for the determination of the anticancer drug 6-mercaptopurine (6-MP). The method is based on the use of fluorescent MoS 2 quantum dots (MQDs) and of the enzyme horseradish peroxidase (HRP). In the absence of 6-MP, HRP catalyzes the oxidation of o-phenylenediamine (OPD) by H 2 O 2 to form 2,3-diaminophenazine (DAP). This leads to quenching of the violet fluorescence of MQDs (measured at excitation/emission wavelengths of 360/415 nm), while the strong yellow fluorescence of DAP (peaking at 560 nm) becomes increasingly strong. In the presence of 6-MP, however, it will be preferentially oxidized by the HRP/H 2 O 2 system to form a disulfide dimer. Hence, less H 2 O 2 is available for the oxidation of OPD and less DAP will be formed. This results in the recovery of the violet fluorescence and a decrease of the yellow fluorescence. The ratio of the two signals can be used to quantify either H 2 O 2 or 6-MP. Linear responses are observed for H 2 O 2 in 0.5–140 μM concentration range, and for 6-MP in the 0.5–70 μM concentration range, with detection limits of 0.1 μM and 0.29 μM, respectively. The method was applied to the determination of 6-MP in spiked human urine and gave satisfactory results.
Schematic of an enzymatic fluorometric method for determination of 6-mercaptopurine (6-MP). It is based on the presence of 6-MP that can inhibit the HRP-catalyzed oxidation of o-phenylenediamine (OPD) to form 2,3-diaminophenazine (DAP). Hence, the fluorescence resonance energy transfer (FRET) between DAP and MoS 2 quantum dots (MQDs) is suppressed.
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高影响因子
危险品化学品经营许可证（带存储）