FLUID PHASE EQUILIBRIA
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2017
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IF 2.473
Jun Wang,Jie Ou,Xueni Sun,Chunxiang Huang,Jiarui Sun,Hui Shao,Yixin Leng
Isobaric vapour–liquid equilibrium (VLE) data for binary systems containing o-cresol (OC) + m-cresol (MC), OC + 2, 6-dimethylphenol (DMP), and MC + DMP at 20.0 kPa were measured by using a modified Othmer still. Its reliability was confirmed by measuring the saturated vapour pressure data for the components of MC and DMP. Herington area test was used to confirm the thermodynamic consistency for these binary systems, and the results showed good thermodynamic consistency. The binary VLE experimental data were correlated and predicted by Wilson, NRTL, and UNIFAC models. The results correlated by Wilson and NRTL models agree well with the experimental values. The results predicted by UNIFAC are in accordance with experimental data with rational deviations for systems OC + MC and OC + DMP but show relatively large deviations between the predicted values and experimental data for MC + DMP system. By defining the group =COH in DMP and MC as two different groups, the experimental data were correlated, and new groups with binary interaction parameters were obtained. The results calculated by UNIFAC with new defining groups are in accordance with the experimental data.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Junyan Wei,Jianqiao Xu,Xinyuan Wei,Dongmei Zhou,Zhongbo Wei,Xiaosheng Tang,Qing Zheng,Zunyao Wang,Ruijuan Qu
Microplastics are widespread in aquatic environments and, due to their small size and similar density to water, often coexist with suspended particulate matter (SPM). Both microplastics and SPM act as carriers, playing key roles in the migration and transformation of organic contaminants. However, most studies have focused on isolated systems, necessitating an investigation into how co-existing microplastics affect the phototransformation behavior of hydrophobic pollutants on carrier surfaces. In this study, a model system was constructed with the most commonly detected polyethylene (PE) microplastics, dichlorodiphenyltrichloroethane (o,p’-DDT), and Yangtze River SPM. The results showed that the introduction of PE into the SPM system notably accelerated the photodegradation of o,p’-DDT, with a synergistic promotion between PE and SPM. Utilizing chemical probes, quenchers, and electrochemical experiments, we found that PE facilitated the electron transfer in SPM, thereby enhancing the generation of reactive oxygen species (ROS) and ultimately, leading to the synergistic effect. By combining liquid chromatography-mass spectrometry and gas chromatography-mass spectrometry, we identified 17 intermediates and proposed three main transformation pathways: elimination, hydroxylation, and dechlorination. The potential mechanisms by which ROS induced these reaction pathways were further validated by density functional theory calculations. Moreover, PE formed interaction products with o,p’-DDT. Initial environmental risk assessment using VEGA and EPI Suite software indicated the products became less toxic, but were more likely to remain in water. This study deepened the understanding of the photochemical effects of microplastics and provided new insights into the environmental fate and risk of organic pollutants.
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ACS Catalysis
·
2025
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IF 13.1
Tingting Xiao,Jingrong Li,Jian Li,Qihang Gong,Peikai Luo,Xinluona Su,Haiyang Cheng,Chao Zhang,Fengyu Zhao
The hydrogenolysis of cellulose-derived 5-hydroxymethylfurfural is essential for the production of fuels and chemicals from biomass. Herein, we fabricated a phosphorus-doped Pd/P-TiO2 catalyst for the hydrodeoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran. A large number of defects and electron-deficient Ti4+ sites (dTi4+) were formed by doping phosphorus into the TiO2 support, which could promote hydrogen spillover and reactant adsorption. Moreover, the spilled active hydrogen induced the formation of P–O(H)-dTi4+, which acted as a “Brønsted acidic site” to promote the activation of C–O bonds. Consequently, the Pd/P-TiO2 catalyst exhibited superb activity for the hydrodeoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran at mild conditions of 150 °C under 1 MPa H2.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Xiao Zhang,Menglin Zhang,Xinyuan Li,Baoping Xin,Jie Hao,Jinying Li,Hansheng Li,Dongxiang Zhang,Zijie Wu,Xiyan Xu,Jiatao Zhang
The risk of radionuclide leakage always threats ecological security and human health, making the recovery of uranium from nuclear wastewater a meaningful and urgent issue. However, the low-cost and efficient capture of uranium remains a challenge at present. In this study, a homemade photocatalyst of iron coordinated graphitic carbon nitride (g-C 3 N 4 ) co-doped with phosphorus and oxygen (OPFCN), which was facilely synthesized through a novel one-step thermal polymerization method, exhibited superior photoelectric efficiency and photocatalytic activity towards the photo-reductive capture of uranium(VI). The simultaneous Fe coordination and P/O co-doping in framework of g-C 3 N 4 played a synergistic effect in charge reconstruction, in which electrons migration driven by coordinated Fe and lone electron pairs delocalization from doped P/O enormously increased electron density and enhanced charge transfer, thus effectively promoting the separation of photogenerated charge carriers. The specific surface area, pore volume and average pore size of OPFCN reached 70.2 m 2 ·g −1 , 0.157 cm 3 ·g −1 and 7.78 nm, respectively, exhibiting a trend increasingly beneficial for photocatalytic adsorption and mass transfer with successive introduction of Fe, P and O into original g-C 3 N 4 . With the simultaneous introduction of Fe, P and O, the optical absorption edge underwent a significant redshift and fluorescence emission intensity dropped by 75 % compared to that of CN, demonstrating the enhanced visible light capturing ability and significantly inhibited recombination of photogenerated charge carriers in OPFCN. As a result, a uranium capture rate of over 98 % was achieved with catalyst dosage of only 5:1 at pH 5 with OPFCN, demonstrating its competitive photo-reductive activity towards uranium(VI) uptake compared with previously reported g-C 3 N 4 -based photocatalysts. Meanwhile, OPFCN exhibited remarkable reusability and stability with even over 65 % uranium recovery rate and almost unchanged peak patterns in XRD and FT-IR in fifth reuse recycle. Additionally, it was demonstrated that e − and O 2 •− were the direct active species to realize the photoreduction of uranium(VI) over OPFCN, in which e − played the dominant role. The modification method of simultaneous Fe coordination and P/O co-doping would be expected to effectively promote the utilization of g-C 3 N 4 -based photocatalysts towards photo-reductive recovery of uranium(VI) from radioactive wastewater.
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JOURNAL OF CATALYSIS
·
2024
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IF 6.5
Yuanjie Xu,Rong Chen,Hongqiao Lin,Qian Lv,Bo Liu,Lizhi Wu,Li Tan,Yihu Dai,Xupeng Zong,Yu Tang
Catalyst interface determines the activity and stability of partial oxidation of methane (POM) toward syngas under high temperatures crucially. Herein, Ni catalysts supported on CeO 2 were prepared under different pretreatment atmospheres to construct an optimal and robust interface. Ni/CeO 2 catalyst pretreated in H 2 (Ni/CeO 2 -H 2 ) exhibits the higher activity and the better stability than Ni/CeO 2 -Ar and Ni/CeO 2 -air catalysts. The Ni-O-Ce interfacial site in Ni/CeO 2 -H 2 catalyst shows the lower reduction temperature, indicating the enhanced H-spillover effect and enhanced oxidation resistance of Ni under POM conditions. Moreover, the XPS and in situ Raman results show that Ni/CeO 2 -H 2 contains more surface oxygen vacancies for adsorbing and activating oxygen, further contributing to the reaction activity. The in situ DRIFTS results indicate that the CH 4 could react with the lattice oxygen to form formate and carbonate, and further decompose to CO and CO 2 . These findings deepen the fundamental understanding of Ni/CeO 2 catalysts for POM reaction.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 37
·15032-15038
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IF 5.7
Haoran Wang,Jiahao Jiao,Abudukadi Tudi,Shilie Pan,Min Zhang
Two borates, K3Al2B11O21 (KABO) and K3Al2MoB9O21 (KAMBO), with edge-sharing [BO4] (ES-[BO4]) tetrahedra and different B–O configurations in one structure, were rationally designed and prepared at atmospheric pressure by introducing covalent tetrahedra. KABO is the first borate identified to have ES-[BO4] tetrahedra and two different dimensional B–O groups, namely, isolated [B6O12] groups with ES-[BO4] and one-dimensional infinite chains. In addition, KAMBO is a rare borate that features ES-[BO4] tetrahedra and two distinct isolated B–O groups ([B6O12] and [B3O6]). The discovery of these two compounds not only enriches the structures of borates, but also suggests a novel method for creating borates with ES-[BO4] tetrahedral structures and flexible B–O configurations at atmospheric pressure.
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Polymer Chemistry
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2017
·Vol. 8
·期 45
·7033-7043
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IF 5.375
Pan Li,Jiacheng Zhang,Chang-Ming Dong
A photoresponsive poly(o-nitrobenzyloxycarbonyl-L-lysine)-b-PEO (PNBL-b-PEO) polypeptide copolymer was synthesized and its photosensitive cleavage and self-assembly were monitored by means of UV-vis spectroscopy, 1H NMR, DLS, and TEM. Three kinds of dual-sensitive (i.e., photo/pH-thermo) polypeptide normal and reverse micellar hydrogels were then fabricated by the physical cross-linking of the self-assembled micelles. Utilizing the inclusion complexation between α-cyclodextrin (α-CD) and PEO of the normal micelles of PNBL-b-PEO or polylysine-b-PEO, photo/pH-thermo-sensitive normal micellar hydrogels were fabricated; in contrast, the reverse micelles of polylysine-b-PEO@α-CD self-assembled at pH = 3 and then were transformed into a pH-thermo-sensitive reverse micellar hydrogel at pH = 10. The multiple self-assembly and hydrogel properties were thoroughly characterized by means of UV-vis spectroscopy, circular dichroism (CD), wide angle X-ray diffraction (WAXD), DLS, zeta potential, rheology, TEM, and SEM. Notably, these dual-sensitive polypeptide hydrogels with a higher mechanical modulus (10–105 kPa) were facilely constructed and the mechanical modulus can be further tuned by varying the UV-irradiation time, the amount of α-CD added, and the copolymer concentration. Consequently, this work provides a versatile platform for constructing polypeptide copolymer hydrogels with tunable mechanical and stimuli-sensitive properties.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2017
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IF 2.603
Hongjuan Li,Ying Liu,Yuetao Yi,Qin miao,Sujing Liu,Feng Zhao,Wei Cong,Chunhua Wang,Chuanhai Xia
In China, Poacynum hendersonii is frequently used as a substitute for Apoacynum venetum L (Luobuma), which is a famous traditional Chinese medicine. Quercetin-3- O -sophoroside and isoquercitrin are two major flavonoids in Poacynum hendersonii leaves. In this work, a suitable method was established for the large-scale preparation of quercetin-3- O -sophoroside (QOS) and isoquercitrin (ISO) from Poacynum hendersonii leaves using macroporous resin combined with Sephadex LH-20 column chromatography. The adsorption/desorption capacities and desorption ratios of six macroporous resins were evaluated using static experiments. The HPD-300 resin had the best adsorption performance because it had the largest surface area, and was selected for further study. Compared with pseudo-first-order and intraparticle diffusion kinetics models, the pseudo-second-order model could better fit the adsorption kinetics of both QOS and ISO on the HPD-300 resin. In addition, the adsorption isotherms of the two compounds on the HPD-300 resin were fitted well to the Langmuir model. Under optimal conditions, the purities of QOS and ISO in the product were increased from 2.16% and 1.26% to 21.34% and 10.70% with recovery yields of 82.1% and 77.3%, respectively. Subsequently, Sephadex LH-20 column chromatography was employed for improving the purities of the two compounds. After separation by Sephadex LH-20 column chromatography, the purities of QOS and ISO achieved 93.5% and 95.6%, respectively.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Jiahuan Cao,Yujia Wu,Yinghuan Fu,Yu Song,Guowen Wang,Hongchao Ma
Photocathodic protection is a promotion strategy for the corrosion protection of metallic materials, and the selection of photocathodic materials is a critical factor in improving the performance of photocathodic protection of metallic materials. Herein, a Ti-P-V-O composite semiconductor photoelectrode with an adjustable porous structure was prepared by the micro-arc oxidation (MAO) method using titanium alloy (TC 4 ) as the matrix and ammonium metavanadate (NH 4 VO 3 ) as the additive. The photogenerated open circuit potential, instantaneous photocurrent density response value, electrochemical impedance spectroscopy, and Tafel curve of as-prepared Ti-P-V-O photo-electrodes were measured after coupling with 304SS to clarify the cathodic protection effect for 304 stainless steel (304SS). It is found that the as-prepared Ti-P-V-O coating photoelectrode has a more negative open circuit potential, a more significant photocurrent density response, more effective interface carrier transport ability, lower resistance, lower compounding efficiency of photogenerated electron/hole pairs, and more negative conduction band level, as compared with that of TiO 2 coatings. Moreover, the optimized Ti-P-V-O photoelectrode (Ti-P-V-O&300 V) exhibited the maximum negative shift of the corrosion potential (410 mV vs. SCE) for coupling with 304 stainless steel. This work presents a new strategy for constructing an efficient coating photo-electrode for photocathodic protection of metallic materials.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yilin Wang,Xiaoli Sun,Yunmei Du,Shuangshuang Li,Mengmeng Wang,Yanru Liu,Lei Wang
Optimizing the electronic structure of Ru by introducing N dopants or O vacancies (V O ) into RuO 2 is expected to be a promising strategy to stimulate the hydrogen evolution reaction (HER) performance. However, it is a challenge to develop a fast and low-energy method to simultaneously achieve the construction of N dopants and V O . This work was the first to optimize the quenching technique for achieving the co-introduction of V O and N in Co-RuO 2 nanosheets (N,Co-RuO 2 -V O ). Related characterizations confirmed that V O and N dopants synergistically optimized the electronic configuration of Ru and the reaction path of alkaline HER. As expected, the mass activity of N,Co-RuO 2 -V O (2208.63 mA m g R u - 1 ) was 8.05-fold that of Pt/C at 100 mV for alkaline HER. Surprisingly, N,Co-RuO 2 -V O required only 148.6 mV to achieve an industrial-grade current density of 1 A cm −2 , which was much lower than the commercial Pt/C catalyst (312 mV). Overall, this work provides an energy-efficient new strategy for the development of Ru-based catalysts with ampere-level currents.
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高影响因子
FOOD HYDROCOLLOIDS
·
2024
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IF 11
Biyang Zhu,Siyu Guo,Peter Chi-Keung Cheung,Kseniya Hileuskaya,Lijun You
Probiotics as pharmaceutical and nutraceutical products are essential to human health, whereas maintaining their viability in adverse environments remains an obstacle. This study presents a well-designed W 1 /O/W 2 emulsion system incorporated in calcium-alginate hydrogel particles for the targeted delivery and sustained release of Lactobacillus bulgaricus in the gastrointestinal tract. Firstly, the degraded fucoidan (DF) with the highest carboxyl content (2.99%), prepared using UV/H 2 O 2 treatment, was more favorable for forming DF-CS nanogel through ionic cross-linking with chitosan (CS). The W 1 /O/W 2 double emulsion fabricated by 0.4 mg/mL DF-CS nanogel possessed the highest interface stability, as concluded from visual appearance, confocal laser scanning microscope (CLSM), droplet size distribution, and ζ-potential results. The double emulsion loaded in 2% alginate hydrogel showed desirable textural properties and swelling behavior, thereby offering a high encapsulation efficiency of Lactobacillus bulgaricus (74.5%). Additionally, the hydrogel delivery system not only achieved sustained release of Lactobacillus bulgaricus in the simulated gastrointestinal condition (>10 7 CFU/g) but also maintained at least 71.3% and 55.1% survival of probiotics at −20 °C and 4 °C, respectively, after 28 d of long-term storage. Overall, these W 1 /O/W 2 double emulsion-filled multilayer self-assembled hydrogel particles can be utilized for better protection and delivery of probiotics in the food and pharmaceutical industries.
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Kuwait Journal of Science
·
2025
·
IF 1.1
Mirza Nadeem Ahmad,Muhammad Naveed Anjum,Akbar Ali,Rabeya Ijaz,Sarosh Iqbal,Rashad Al-Salahi,Hatem A. Abuelizz,Cedric Delattre
The synthesis of poly( o -anisidine)/multi-walled carbon nanotubes composite (POA/MWCNTs NC) was carried out via chemical oxidative polymerization for the adsorptive removal of Direct Yellow 26 dye (DY 26). In the polymerization, the ammonium persulphate was used as an oxidant along with 4,4′-diaminodiphenylamine dimer as initiator. Then, the structural composition, crystalline properties, absorption behavior, morphology, and surface attributes of both the polymer and the nanocomposite were analyzed by different techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), UV–visible spectroscopy (UV–visible), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller analysis (BET). BET analysis showed significant improvement in the surface area (690 m 2 /g) and porosity (0.216 cm 3 /g) of the composite material as compared to pure POA. Further, the composite was applied for the elimination of DY 26 in aqueous media. Moreover, the adsorption parameters were also optimized like pH, contact time, adsorbent dose and dye concentration. The highest dye removal efficiency was achieved up to 83% against 50 mg/L concentration of dye solution under the conditions of pH at 2, contact time of 30 min, and 2 g amount of the adsorbent. Furthermore, the kinetic studies revealed that the adsorption of DY 26 followed the pseudo first-order rate constant by the polymeric adsorbent.
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危险品化学品经营许可证（带存储）