INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Meng Chen,Wei Lu,Hejun Zhu,Leifeng Gong,Ziang Zhao,Yunjie Ding
Linear α-olefins (C8–C12 α-olefin, LAOs) are acknowledged as high-value-added chemicals in both lubricant production and the polyolefin industry. An alternative route to the synthesis of high-purity LAOs is the dehydration of linear long-chain n-alcohols, whereas elevating the activity and selectivity of catalysts remains a challenge. Herein, we presented that on using sodium-modified γ-Al2O3 as the catalyst, a high selectivity (up to 96.87%) to 1-decene was achieved, and an optimized experimental condition (329 °C and 0.25 h–1) was found using the response surface method. Characterization results including X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), pyrolysis (Py)-IR, NH3-temperature-programmed desorption (TPD), and CO2-TPD showed that a suitable ratio (∼0.4 wt %) of sodium impregnation could inhibit the strong acid sites of the catalyst, and sodium impregnation led to the formation of additional base sites, which accounted for the synergistic effect with other acid sites to promote further conversion of ethers to olefins. This work is of significance for the synthesis of LAOs from long-chain n-alcohols.
研究领域:
催化化学
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材料科学
·
石油化工
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产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Ronghua Yu,Jie Liu,Doudou Gao,Yanhui Wang,Xin Wen,Tao Tang
To improve the flame retardancy of polymer nanocomposites , a grafting strategy to modify carbon black nanoparticles by grafting sodium sulfonate (CB- g -SS) was developed in polycarbonate (PC) system. The grafting reaction for CB- g -SS was evaluated by FTIR, XPS and TGA , respectively. Furthermore, PC/CB- g -SS nanocomposites were prepared, and the striking effect of CB and SS on improving the flame retardancy of PC was investigated. With only 1 wt% of CB- g -SS, the PC nanocomposites exhibited a high limiting oxygen index of 33.1%, and V-0 rating in UL-94 test, as well as significant decrease on the peak of heat release rate (PHRR) by 51.6% in cone calorimeter test. The flame retardancy mechanism was also discussed, which was ascribed to the catalytic carbonization of SS on CB surfaces for promoting the formation of interconnected carbon layer. Thus, this work provides a useful and effective method for preparing high-performance PC nanocomposites.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Wang Xiangyu,Wu Lan,Ma Jun
The aggregation of nanoscale zero-valent iron (NZVI) is one of the biggest challenges for its application when treating contaminants in aquatic environment. We report a study on synthesis of sodium carbonate-modified biochar (BC-600) combined with sodium alginate (SA)-modified NZVI (SA/NZVI@BC-600) for the removal of tetracycline (TC). When the initial concentration of TC was 20 mg/L, 100% TC was removed by SA/NZVI@BC-600 at an initial pH of 7 under room temperature of 25 °C within 90 min. In addition, the reactivity of the SA/NZVI@BC-600 composites toward TC removal was not obviously declined after 4 cycles. SA/NZVI@BC-600 shows high reactivity, stability, and reusability. This excellent performance of SA/NZVI@BC-600 was related to the addition of SA and BC-600. The best performance of the SA/NZVI@BC-600 system was observed under weakly acidic and neutral conditions. Increasing the initial concentration and lowering the reaction temperature had a slight negative effect on the removal of TC by SA/NZVI@BC-600. In addition, the presence of CO 3 2− and HCO 3 − had a significant negative effect on the degradation of TC. Meanwhile, ·OH and ·O 2 − played the leading role in TC degradation. This study not only reported a novel strategy of synthesizing an excellent BC modified NZVI based catalyst but also evaluated its promising application for antibiotic degradation in aqueous solution.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Shuaijie Hou,Runshan Chu,Guangtao Chang,Weibin Xie,Guoqiang Chen,Xueni Hou,Tieling Xing
Thermal transfer printing of polyester requires high temperature. Sodium hydroxide (NaOH) was used to modify boron nitride (BN) through exfoliation under high temperature conditions, resulting in the formation of BNOH, which creates a better thermal conductivity pathway by changing the morphology and size of BN. This modified BNOH was introduced into the preparation of new thermal transfer printing pastes for polyester fabrics, which can effectively reduce the energy consumption and improve the color yield of the printed fabrics. The results showed that the thermal conductivity of F-PVA/BNOH films, prepared by blending polyvinyl alcohol with BNOH, was 2.279 W·m -1 ·K -1 , which was 17.4 % higher than that of F-PVA/BN films when the filler content reached 8 %. Meanwhile, the viscosity of P-PVA/BNOH paste was 383 mPa·s, which was 31.3 % lower compared with that of P-PVA/BN paste. The K/S value of the fabrics printed with P-PVA/BNOH paste was higher than those printed with P-PVA/BN and P-PVA, and P-PVA/BNOH paste could reduce the transfer temperature by about 10 °C and the transfer time by at least 15 s. The optimal process conditions for thermal transfer printing are 8 % BNOH content, a transfer temperature of 190 °C and a transfer time of 40 s. The change rate of line width in the three colors remained below 9 %, and the color fastness of the printed fabrics was not affected. The development of new paste reduces the printing temperature and improves the overall printing effect of polyester fabrics, which is in line with the eco-friendly principle of green production and environmental protection.
研究领域:
材料科学
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纺织工程
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绿色生产
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yongqing Xu,Bowen Lu,Cong Luo,Fan Wu,Xiaoshan Li,Liqi Zhang
Calcium looping (CaL) is a promising thermochemical energy storage (TCES) technology to convert solar energy to power in CO 2 Brayton cycle. However, the energy storage density (ESD) of the CaO-based heat carries decays drastically over the CaL cycles, and the energy storage performance of the CaO-based materials in a close-loop CaL-TCES system is still unclear. In this work, a novel Na 2 CO 3 modified method was proposed to enhance the ESD of the CaO-based materials over the close-loop CaL-TCES process, and the enhancing mechanism was investigated by the simultaneous thermal analyzer, X-ray diffraction, electron microscopy, N 2 physisorption, X-ray photoelectron spectroscopy. The “10Na 2 CO 3 /CaO” showed more promising ESD over the cycles, even though it suffered sintering. After 60 cycles, the “10Na 2 CO 3 /CaO” still held an ESD of 594 kJ/kg, which was 2.27 times that of “Neat CaO” when cycled at “850 °C–900 °C” mode. Increase the carbonation temperature from 650 °C to 850 °C, the cyclic energy storage densities of the “10Na 2 CO 3 /CaO” ascended rapidly, which was opposite to the “Neat CaO”. The optimum operating condition for the “10Na 2 CO 3 /CaO” is “850 °C–900 °C” when operated in the close-loop CaL-TCES system. The Na + species that enriched on the surface of the CaO grains were in amorphous or melting state, and they would react with CaO to form Na-Ca solid solution over the cycles. The “10Na 2 CO 3 /CaO” has a tendency of sintering over the cycles, but Na 2 CO 3 improves reaction kinetics. One suggested mechanism is that the Na + species may break through the mass transfer barriers to absorb CO 2 during the carbonation process. Therefore, although the Na 2 CO 3 doped CaO materials had poorer surface topography, they held much higher ESD over the repeated cycles.
研究领域:
材料科学
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可再生能源
·
太阳能技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Dongliang Yang,Feipeng Cheng,Le Chang,Dengfeng Wu
Developing efficient and low-cost adsorbent for removing heavy metal ions from aqueous solution is of great significance for environmental protection. Herein, low quality natural bentonite was purified and sodium-modified to adsorb Pb 2+ from the aqueous phase. The effects of initial pH value of the solution, type and amount of the adsorbent, contact time and initial Pb 2+ concentration on the adsorption performance of sodium bentonite were systematically studied. The adsorption efficiency of sodium bentonite was significantly better than that of purified bentonite and natural bentonite toward Pb 2+ . Under the optimum adsorption conditions of pH = 5, adsorbent dosage of 0.2 g, initial Pb 2+ concentration of 400 mg/L, and adsorption time of 120 min, sodium bentonite can remove more than 99.94% of Pb 2+ . Adsorption behavior fitted well with Freundlich isotherm and pseudo-second-order kinetics adsorption equations. Adsorption process was endothermic and feasible. The adsorption pathways of Pb 2+ on sodium bentonite are mainly including ion exchange, surface hydroxyl functional group capture, electrostatic attraction and chemical precipitation by CO 3 2- in the pore channel to form PbCO 3 . This research is anticipated to give technical support for prompting the wider application of bentonite as an adsorbent material.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 4
·252
·
IF 5.3
Yanan Wang,Yanan Lu,Hao Zhong,Minghui Guo,Jingkui Li
To solve the problem of dye contamination caused by methylene blue (MB), a one-step synthesised nanocellulose (CNF) and polyacrylamide (PAM) gel network was modified by using NaOH in this study, and the prepared samples were analysed for their micromorphology, chemical structure, and adsorption-release properties. The findings demonstrated that the maximum adsorption capacity of the CNF-PAM5% was 172.08 mg/g, which followed the quasi-second-order kinetic model and the Freundlich adsorption model. The adsorption of the gel increased with the increase of the NaOH-modified concentration. However, the adsorption efficiency of the CNF-PAM5% could still reach 85% after four cycles, and the CNF-PAM5% remained intact without signs of fragmentation after 4 h of stirring and water impact, which was attributed to the introduction of CNF into the PAM network to effectively improve the mechanical properties of the gel. Moreover, toxicity tests showed no significant difference in the amount of cellular activity, even when the volume of the CNF-PAM5% sample was increased up to 10-fold. This gel, which exhibits low toxicity and excellent recycling properties, serves to reduce environmental impact during the adsorption process. Furthermore, the potential exists for utilising the gel’s methylene blue-releasing (MB) properties as a fungicide for fish.
研究领域:
环境科学
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
·
2022
·Vol. 35
·期 1
·04022362
·
IF 3.651
Ming Zhang,Luyan Wang,Xiuzhi Zhang,Xiangyun Mi,Fengmeng Sun,Zhenzhen Fang,Meishan Pei
In this study, sodium hypophosphite (SHP) was used to modify polycarboxylate superplasticizer (P-PCE), and the properties of P-PCE on β-calcium sulfate hemihydrate (β-HH) were systematically investigated. The results showed that P-PCE could exhibit better fluidity and more retarding effect compared with the conventional polycarboxylate superplasticizer (C-PCE). The reason might be ascribed to the higher adsorption ability of P-PCE because of its stronger complexing capacity with calcium ion, which was induced by the phosphonate and phosphinate groups in the P-PCE molecule. Additionally, PCE played an important function in hindering the calcium sulfate dehydrate (DH) crystallization instead of the dissolution of β-HH, resulting in the retarding effect. This new type of PCE can show great potential in gypsum engineering.
研究领域:
建筑材料学
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材料化学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2022
·Vol. 33
·期 5
·1442-1456
·
IF 3.348
Ming Zhang,Luyan Wang,Xiuzhi Zhang,Xiangyun Mi,Fengmeng Sun,Mei Ding,Meishan Pei
A sodium hypophosphite (SHP) modified polycarboxylatesuperplasticizer (P-PCE) was synthesized successfully and the synthesis parameters were optimized through orthogonal experiment. Gel permeation chromatography (GPC), X-ray photoelectron spectroscopy (XPS), 31 P magic spinning nuclear magnetic resonance ( 31 P MAS NMR) spectroscopy and elemental analysis measurements were used to characterize the molecular structure of P-PCE. Effects of P-PCE on the dispersing performance of cement paste were systematically investigated via mini slump test. The results showed that P-PCE exhibited superior dispersing performance, more retarding hydration effect and better sulfate and clay tolerance than conventional PCE (C-PCE). Results showed that the maximum flow of cement paste could reach up to 305 mm, while that of the C-PCE was 285 mm.The maximum variation of adsorption of P-PCE was 9% and 15% in the presence of sulfate and clay, whereas that of C-PCE was 15% and 25%, respectively, leading to better sulfate and clay tolerance. These significant advantages could be ascribed to the high anion density and high calcium complexing capacity induced by introducingphosphinate group and phosphonate group into the molecular structure of P-PCE. The as-synthesized P-PCE can be used as a kind of high performance superplasticizer in concrete engineering.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Junbo He,Menglu Wang,Peipei Zhu,Hailong Zhang,Chun Hu,Weinong Zhang
Polyglycerol-10 dialdehyde , prepared by NaIO 4 oxidation of polyglycerol-10, was used as a novel cross-linking reagent for sodium caseinate (NaCas) modification, which can alter the emulsifying properties of proteins. The results revealed that cross-linking resulted in an approximately two-fold increase in the surface hydrophobicity and a 15° increase in the contact angle of NaCas. The emulsifying activity index, emulsion stability index, and oil-binding capacity of cross-linked NaCas also increased significantly. Furthermore, the stabilization of soybean oil-in-water emulsion demonstrated that cross-linked NaCas can prevent oil droplets from aggregating during storage; meanwhile, compared to the native protein, the cross-linked NaCas improved the stability of the emulsions under high ionic strength and temperatures. It is worth noting that the polyglycerol-integrated NaCas showed less adsorption on the glass surface. These findings clearly illustrate that renewable polyglycerol can be used as a novel cross-linking reagent for protein modification, which will provide proteins with promising features for use as emulsifiers in the food, pharmaceutical, and cosmetic industries.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yiwei Cao,Dongyan Xu
Low-cost biochar with a large surface area and enriched oxygen functional groups was prepared by pyrolysis of orange peel and post-NaOH modification. The modified orange peel-based biochar (MOPBC) was examined for its performance in removing quinoline from aqueous solution by adsorption. As high as 197.53 mg/g of adsorption capacity of MOPBC for quinoline was achieved. The quinoline adsorption on MOPBC conforms to the pseudo-second-order kinetic model, well-fitted with the Freundlich isotherm model. Moreover, density functional theory calculation results show that quinoline is more readily adsorbed on oxygen-containing functional groups on the surface of MOPBC, especially hydroxyl groups. The plausible chemisorption mechanisms involve hydrogen bonding, acid-base interaction, π–π, and n–π interactions. This study proves that modified biochar is a prospective adsorbent concerning the disposal of quinoline in wastewater.
研究领域:
环境科学
·
化学工程
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材料科学
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物理化学
·
水污染控制
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 16
·24398-24411
·
IF 0
Xie Yuxuan,Peng Xiao,Song Xin,Ning Ping,Sun Xin,Ma Yixing,Wang Chi,Li Kai
CH 3 SH is a potential hazard to both chemical production and human health, so controlling its emissions is an urgent priority. In this work, a series of transition metal-loaded H-ZSM-5 adsorbents (Si/Al = 25) (Cu, Fe, Co, Ni, Mn, and Zn) were synthesized through the wet impregnation method and tested for CH 3 SH physicochemical adsorption at 60 °C. It was shown that the Cu-modified H-ZSM-5 adsorbent was much more active for CH 3 SH removal due to its abundant strong acid sites than other transition metal-modified H-ZSM-5 adsorbents. The detailed physicochemical properties of various modified H-ZSM-5 adsorbents were characterized by SEM, XRD, N 2 physisorption, XPS, H 2 -TPR, and NH 3 -TPD. The effects of metal loading mass ratio, calcination temperature, and acid or alkali modification on the performance of the adsorbent were also investigated, and finally 20% Cu/ZSM-5 was found to have the best adsorption capacity after calcined at 350 °C. Additionally, the Cu/ZSM-5 adsorbent modified by sodium bicarbonate could expose more active components, which improved the adsorbent’s stability. However, the consumption and reduction of the active component Cu 2+ and the accumulation of sulfate during the adsorption process are the main reasons for the deactivation of the adsorbent. In addition, the simultaneous purging of N 2 + O 2 can effectively restore the adsorption capacity of the deactivated adsorbent and can be used as a potential strategy to regenerate the adsorbent. Graphical
研究领域:
环境科学
·
材料化学
·
催化
·
吸附技术
·
化学工程
✓ 已验证
DOI
危险品化学品经营许可证（带存储）