JOURNAL OF SURFACTANTS AND DETERGENTS
·
2017
·Vol. 20
·期 6
·1255-1262
·
IF 1.45
Niu Ruixia,Wang Chao,Sun Zhigang,Long Biao,Song Hua,Ren Weidong,Wang Daqiang,He Junyao
A series of alkyl sulphobetaine Gemini surfactants C
n
-GSBS ( n = 8, 10, 12, 14, 16) was synthesized, using aliphatic amine, cyanuric chloride, ethylenediamine, N , N ′-dimethyl-1,3-propyldiamine and sodium 2-chloroethane sulfonate as main raw materials. The chemical structures were confirmed by FT-IR, 1 H NMR and elemental analysis. The Krafft points differ markedly with different carbon chain length, for C 8 -GSBS, C 10 -GSBS and C 12 -GSBS are considered to be below 0 °C and C 14 -GSBS, C 16 -GSBS are higher than 0 °C but lower than room temperature. Surface-active properties were studied by surface tension and electrical conductivity. Critical micelle concentrations were much lower than dodecyl sulphobetaine (BS-12) and decreased with increasing length of the carbon chain from 8 to 16, and can reach a minimum as low as 5 × 10 −5 mol L −1 for C 16 -GSBS. Effects of carbon chain length and concentration of C
n
-GSBS on crude oil emulsion stability were also investigated and discussed.
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JOURNAL OF POLYMER RESEARCH
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2017
·Vol. 24
·期 10
·1-10
·
IF 1.615
Lu Jiehong,Yan Guangming,Zhang Gang,Yang Jie
A series of poly(arylene ether)s with pendant cyclohexyl units had been prepared by solution polycondensation of 4,4′-cyclohexane-1,1′-diyldiphenol (CHDP) and 4,4′-difluorobenzophenone (DFBP) (or 4,4′-difluorodiphenylsulfone (DFDPS)). The inherent viscosities of obtained poly(arylene ether)s were in the range of 0.49–0.97 dLg −1 . They were found to have high glass transition temperatures (T g ) of 158–208 °C, and good thermal stability with 5% weight-loss temperature (T 5% ) of 442–484 °C. The tensile test and dynamic mechanical analysis results indicate the good mechanical properties of poly(arylene ether)s. Their Young’s Mdoulus were found to be 2.2–2.3 GPa, tensile strengths were 81.0–97.7 MPa, storage mdoulus were over 1.5 GPa even near glass transition temperature. The complex viscosities of the resultant polymers melt maintained a narrow range of 308–313 Pas at 260 °C or 2700–4600 Pas at 340 °C during the testing time. That indicates the resultant resins have good melt flowability and stability. In addition, these poly(arylene ether)s were found to have good solubility in various solvents such as CHCl 3 , THF, NMP, DMAc, DMI, etc., and have good optical transmittance (>80%) at 450 nm. It suggests that the obtained poly(arylene ether)s not only can be processed by melt method, but also can be applied with solution method easily, and can be applied to tough and transparent films.
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LANGMUIR
·
2024
·
IF 3.7
Siyu Gan,Zhenxing Wang,Chunli Zheng,Zishen Lin,Ai-bin Zhu,Bo Lai
Commercial micron zerovalent iron (mZVI) and sulfur were used to prepare sulfidated micro zerovalent iron (S-mZVI) through ball milling. The corrosion potentials of mZVI and S-mZVI were −0.01 and −0.37 V, respectively, indicating S-mZVI possessed a stronger electron-donating ability. The practical antimony mine wastewater (C0(Sb(V)) = 3.8296 mg/L, pH = 8.29) was treated. If meeting the national discharge standard of 5 μg/L, 2.0 g/L mZVI and 1.6 g/L S-mZVI were required within 120 min. Passing N2 or reducing wastewater pH enhanced the treatment of Sb(V) by S-mZVI, in which the wastewater acidification was more effective. Once the wastewater pH was adjusted to 3.00, only 0.7 g/L S-mZVI and 40 min long time were needed to achieve the emission below 5 μg/L. Even S-mZVI underwent four cycles, and the final concentration of Sb(V) was as low as 4.67 μg/L. As the pHzpc value was 4.09 and the corrosion potential was −0.56 V at pH 3.0, the electron-donating ability of S-mZVI as well as the electrostatic attraction between the surface of S-mZVI and Sb(V) increased. Sulfidation of mZVI and then application under the acid condition significantly improved the treatment efficiency of Sb(V).
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Muhammad Sabir,Mahmoud Sayed,Zhuofan Zeng,Bei Cheng,Wang Wang,Chuanbin Wang,Jingsan Xu,Shaowen Cao
The photocatalytic conversion of carbon dioxide (CO 2 ) into valuable products holds great promise from environmental and economic perspectives. However, current photocatalytic materials still exhibit unsatisfactory efficiency. In this study, a notably efficient step-scheme (S-scheme) heterojunction was developed by combining the Co-MOFs with carbon nitride nanosheets (g-C 3 N 4 ). The electrostatic interaction between these components not only facilitates the exfoliation of g-C 3 N 4 layers but also enhances the stability of the photocatalyst structure. The optimal heterojunction Co-CN4 photocatalyst achieved a significantly enhanced CO production rate of 16.1 µmol g −1 h −1 , which is 4.7 times higher than that of pure g-C 3 N 4 . This improved activity is ascribed to the enhanced light absorption and mitigated charge carrier recombination. Density functional theory (DFT) computations in conjunction with experimental observations elucidate the establishment of a close contact interface. Additionally, electron paramagnetic resonance (EPR) and in situ X-ray photoelectron spectroscopy (XPS) characterization unveil the electron transfer pathway of Co-CN4 during photocatalytic CO 2 conversion. This study offers valuable insights into the design of S-scheme photocatalysts for enhancement of CO 2 photoreduction.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yiling Ran,Man Yang,Jian Li,Jinlei Song,Yi Wang,Zhanguo Li,Liyong Yuan
Developing versatile sorption materials for radionuclide capture (e.g. iodine) is critical for nuclear energy and environmental science. Covalent organic frameworks (COFs) have recently become a new platform for developing sorption materials because of their high surface area and functionalised skeleton structure. Herein, two types of COF materials containing thiophene were designed as iodine sorbents and synthesised via a Schiff base reaction of benzo[1,2-b:3,4-b’:5,6-b’’]trithiophene-2,5,8-tricarbaldehyde, benzidine (DADP) and p-phenylenediamine (DAB): DADP-COF and DAB-COF. DAB-COF exhibits a unique granular-rod-like morphology and has a higher surface area (1775 m 2 /g) than DADP-COF (1140 m 2 /g), which is clearly beneficial for the physical adsorption of iodine. Meanwhile, the COF backbone is rich in N and S sites, which are advantageous for the chemical adsorption of iodine. These two features make the two prepared COFs ideal iodine sorption materials. DAB-COF demonstrates an excellent gaseous iodine adsorption capacity of 4.2 g/g, ranking it as one of the most effective iodine sorption materials, while DADP-COF exhibits a good adsorption capacity of over 235 mg/g for iodine in cyclohexane solutions. Density functional theory calculations prove that imine N and thiophene S serve as active sites during the iodine adsorption. DAB-COF exposes more active sites because of its higher surface area, leading to a higher iodine adsorption capacity than DADP-COF. The results of this study indicate that introducing thiophene to COFs improves sorption efficacy for sorption applications in general and particularly paves the way for developing stable and effective COF sorbents for iodine capture from various environments.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 2
·1286-1296
·
IF 2.599
Cao Sheng,Zheng Jinju,Dai Chencheng,Wang Lin,Li Chengming,Yang Weiyou,Shang Minghui
In this report, doping concentration-dependent photoluminescence (PL) properties of Mn-doped ternary Zn–In–S quantum dots (QDs) were studied by using steady-state and time-resolved PL spectroscopy. The QDs PL was firstly significantly intensified with the increasing Mn doping concentration and then decreased after the doping concentration increased up to 7.5 at.%. However, their decay lifetimes exhibit a monotone decrease with Mn doping concentration ranged from 0 to 10 at.%. It can be concluded that the PL intensity was mainly determined by two factors: one was the increased efficiency of energy transfer from host excitons to Mn 2+ ion accepter, and the other was the decreased efficiency of the emission from a Mn 2+ ion, which was caused by the increased component of exposed Mn 2+ ions on QDs surface and the accelerated interaction between adjacent dopants. The competition of above two exciton relaxation dynamics processes determined the trend of the PL intensity, while the latter was responsible for the monotonously decreased lifetime of the Mn 2+ ion emission with the increasing Mn doping concentration.
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CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Baolong Zhang,Fangxuan Liu,Bin Sun,Tingting Gao,Guowei Zhou
ABSTRACT Photocatalytic water splitting to produce H 2 using semiconductor photocatalysts is a reliable approach to alleviating energy shortages and environmental pollution. However, the inadequate light-harvesting ability, rapid photogenerated carrier recombination, and inferior redox capacity of the individual photocatalysts restrict their photocatalytic activity . To address these limitations, a hierarchical S-scheme heterojunction of ZnIn 2 S 4 -nanosheet-decorated flower-like TiO 2 microspheres for enhancing photocatalytic H 2 evolution, purposely constructed through in situ chemical bath deposition, has been reported. The as-synthesized TiO 2 /ZnIn 2 S 4 heterojunctions exhibited ZnIn 2 S 4 -content-dependent photocatalytic activity for solar-driven H 2 evolution. As a result, the optimized TiO 2 /ZnIn 2 S 4 heterojunction exhibited a superior photocatalytic H 2 evolution rate of 6.85 mmol g –1 h –1 , approximately 171.2- and 3.9-fold with respect to that obtained on pure TiO 2 and ZnIn 2 S 4 , respectively, mainly attributed to the unique hierarchical structure, extended light-harvesting ability, enhanced redox capacity, and improved separation and transfer efficiencies of the photogenerated carriers induced by the S-scheme heterojunctions. Simultaneously, a detailed analysis of the S-scheme electron transfer pathway in the TiO 2 /ZnIn 2 S 4 heterojunction was performed using in situ irradiated X-ray photoelectron spectroscopy and electron paramagnetic resonance spectroscopy . This study provides insights into the design of highly active heterojunction photocatalysts for sustainable solar-to-fuel energy conversion.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Xiu Huang,Yong Li,Zhao Shu,Li Huang,Qian Liu,Guibin Jiang
Plastic pollution is a significant environmental concern globally. Plastics are normally considered chemically inert and resistant to biodegradation. Although many papers have reported enzyme-induced biodegradation of plastics, these studies are primarily limited to enzymes of microbial origin or engineered enzymes. This study reveals that poly(ethylene terephthalate) (PET, ∼6000 Da and 100 kDa) particles and plastic bottle debris (PBD, 24.9 kDa) can be efficiently degraded by a mammal-origin natural phase II metabolic isozyme, glutathione S-transferase (GST), under mild conditions. The degradation efficiency of PET plastics reached 98.9%, with a degradation rate of 2.6 g·L–1·h–1 under ambient or physiological conditions at 1 atm. PET plastics can be degraded by GST with varying environmental or biological factors (i.e., temperature, light irradiation, pH, and presence of humic acid or protein). We suggest a novel mechanism for PET degradation other than hydrolysis, i.e., the mechanism of cleavage and release of PET plastic monomers via nitridation and oxidation. This finding also reveals a novel function of GST, previously thought to only degrade small molecules (<1000 Da). This method has been successfully applied in real human serum samples. Additionally, we have tested and confirmed the ability to degrade PET of a mammal-origin natural digestive enzyme (trypsin) and a human-derived natural metabolic enzyme (CYP450). Overall, our findings provide a potential new route to plastic pollution control and contribute to our understanding of the metabolism and fate of plastics in organisms.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yanze Wang,Zhenyu Liu,Wenxuan Wang,Junxiao Tang,Rongjie Wang,Jingjing Xie,Zhengyi Fu
Accelerating charge transport and avoiding recombination are promising strategies for establishing highly efficient artificial photosystems. Herein, an S-scheme heterostructure consisting of Zn x Cd 1− x S and TiO 2 is fabricated via the in situ crystal growth method. The refined structure significantly enhances the transport of photogenerated charges, thereby improving photocatalytic hydrogen production efficiency. The optimized TiO 2 −Zn x Cd 1− x S composite, incorporating 60% TiO 2 with Zn 0.4 Cd 0.6 S, exhibits a robust H 2 evolution rate of 50.96 mmol g −1 h −1 with continuous release of H 2 bubbles. It is worth noting that the hydrogen production rate in seawater is as high as 26.22 mmol g −1 h −1 . The strong interfacial interaction and staggered band alignment between TiO 2 and Zn x Cd 1− x S result in the formation of a built-in electric field and high-content oxygen vacancies, which can drive the directional migration of photoelectrons with high redox ability and high speed. The designed photocatalyst with S-scheme and rich Oxygen vacancies at the interface provides a new approach for fabricating high-efficiency photocatalysts.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Hongxu Zhou,Weichen Han,Hongquan Chai,Hao Huang,Jingang Zheng,Han Zhang,Lixiang Li,Weimin Zhou,Baigang An,Chengguo Sun
Sluggish reaction kinetics in lithium–sulfur (Li–S) batteries has seriously hindered their practical application. Herein, a three-dimensional (3D) granular carbon skeleton decorated with nickel-rich NCM materials (NCM@3D-SP) is prepared as a cathode host for Li–S batteries, where the carbon matrix is rich in pore channels, can provide good conductivity and electrolyte diffusion, and NCM811 particles contribute abundant metal sulfides active sites through metal-ion exsolution. The different metal sulfides (NiS, Ni3S2, Ni7S6, and CoS) in heterogeneous structures exhibit outstanding catalytic and adsorption effects on polysulfides during cycling, where the ion diffusion coefficient is increased by approximately 2.5 times compared to the cathode without catalytic active sites (3D-SP). A Li metal battery using NCM@3D-SP/S as the cathode exhibits a capacity decay of only 0.051% per cycle at 2C after 500 cycles. Even at an ultra-high current density of 10C and a sulfur-loading of 6 mg cm−2, the cells maintain a stable reversible discharge capacity of 453.1 mA h g−1 after 500 cycles and 4 mA h cm−2. The incorporation of nickel-rich cathode materials and 3D sulfur host structure presents a novel strategy for high-catalytic activity cathodes of Li–S batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Alamgir,Raza Ullah,Khalid Talha,Hongye Yang,Nouraiz Mushtaq,Abrar Ahmad,Linkun Fan,Lan Li,Guixia Zhao,Xusheng Wang,Junkuo Gao
It is challenging to engineer a photocatalyst that can degrade antibiotics efficiently. We have successfully developed a series of photocatalysts by annealing In-MOF (BUT-205) with TiO 2 , namely (a) In 2 O 3 /TiO 2 -I, (b) In 2 O 3 /TiO 2 -II, and (c) In 2 O 3 /TiO 2 -III. These catalysts, particularly In 2 O 3 /TiO 2 -III, exhibited superior efficiency in degrading tetracycline (TC) under visible light. The enhanced photocatalytic performance of In 2 O 3 /TiO 2 -III can be attributed to the formed S-scheme heterojunction, which promoting the separation of electron-hole pairs. The S-scheme heterojunction was confirmed by XPS , in-situ XPS, UV–vis diffuse reflectance spectroscopy, and Mott-Schottky plot, etc. Compared to pure TiO 2 and In 2 O 3 , the In 2 O 3 /TiO 2 -III demonstrated an 18-fold and 3-fold higher degradation rate constant (k). Various factors affecting the degradation of TC were investigated, including pollutant concentration, catalyst type, solution pH, catalyst dosage, inorganic anions , inorganic cations , and radical species. Photoluminescence (PL) and transient photocurrent density evaluate the separation rate of electron-hole pairs, and EPR experiments (active species trapping) studies confirmed •O 2 − and h + as the primary entities in TC photodegradation by In 2 O 3 /TiO 2 -III. HPLC/MS analysis revealed the photocatalytic degradation pathway. The MOF-derived photocatalysts efficiency in TC photoreduction results from the formed S-scheme heterojunction, making it a promising candidate for environmental remediation.
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JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Xiao Huang,Cai Liu,Yang Lu,Tongping Xiu,Jun Jin,Michael E. Badding,Zhaoyin Wen
A high strength Li-Garnet solid electrolyte composite ceramic is successfully prepared via conventional solid state method with Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 and nano MgO powders. Well sintered ceramic pellets and bars are obtained with 0–9 wt.% MgO. Fracture strength is approximately 135 MPa for composite ceramics with 5–9 wt.% MgO, which is ∼50% higher than that of pure Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (90 MPa). Lithium-ion conductivity of the composite is above 5 × 10 −4 S cm −1 at room temperature ; comparable to the pure Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 material. SEM cross-sections of the composite ceramic shows a much more uniform microstructure comparing with pure ones, owing to the grain growth inhibition effect of the MgO second phase. A battery cell consisting of Li/composite ceramics/Sulfur-Carbon at 25 °C exhibits a capacity of 685 mAh g −1 at 0.2 C at the 200 th cycle, while maintaining a coulombic efficiency of 100%. These results indicate that the composite ceramic Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 -MgO is promising for the production of electrolyte membrane and fabrication of Li-Sulfur batteries.
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