WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 4
·1-12
·
IF 3.8
Liu Yonghong,Yang Xiaoxiao,Wang Ning,Wang Quanhong
While high-efficiency photocatalysts have been extensively researched, there is still a scarcity of reports focusing on enhancing the practical application conditions of low-cost engineering photocatalysts. In this study, a 13.8-L continuous streamer catalytic reactor was developed utilizing low-cost self-made TiO 2 /ACF photocatalyst. Employing the Box-Behnke response surface method, the study assessed the reactor’s efficiency in treating organic wastewater using methylene blue (MB) as the model pollutant. The TiO 2 /ACF photocatalysis was characterized by XRD, EDS, and SEM, and the results showed that the nano-TiO 2 was uniformly loaded with the surface of activated carbon fibers in a lamellar form. Results indicated that with a single cycle time of 134 min and a catalyst amount of 95 cm × 95 cm, the average decolorization rate for 3 mg/L MB wastewater was 90.63%, following quasi-second-order kinetics. The MB wastewater’s decolorization efficiency swiftly reached 89.8% within the initial 120 min, maintaining around 90% during continuous 600-min treatment. The optimal catalyst condition was identified, enhancing photodegradation efficiency of MB organic molecules. The developed photocatalytic equipment exhibited high efficiency and stability in degrading low-concentration organic molecules.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Lei Yao,Chao Hong,Yangxu Qi,Lie Wu
In this study, we developed a novel magnetic composite of walnut shell biochar (WSB) and modified it with ZIF-7 for the purpose of removing Co 2+ ions. We conducted a comprehensive evaluation of its performance in Co 2+ removal, considering various factors such as contact time, temperature, adsorbent dose, pH, and initial Co 2+ concentration. Utilizing response surface methodology-central composite design (RSM-CCD), we examined the interactions between these variables. The specific surface area and magnetic saturation value of the WSB/MnFe 2 O 4 /ZIF-7 composite were determined as 170.560 m 2 .g −1 and 23.469 emu.g −1 , respectively. ANOVA analysis indicated that our model effectively captures the interactions between variables, with a high R 2 value of 0.9982, explaining 99.82 % of the experimental data. Optimal conditions for maximum Co 2+ adsorption efficiency (99.05 %) were identified as follows: a contact time of 44.82 min, pH of 6.04, adsorbent dose of 0.947 mg.L -1 , temperature of 25.55 °C, and Co 2+ concentration of 11.13 mg.g −1 . Kinetic studies revealed that the Pseudo 2nd order kinetic model provided the best fit to the experimental data. The negative entropy parameter indicated a decrease in disorderliness during the adsorption process, while the exothermic nature of adsorption was confirmed by enthalpy values of −92.751 and −40.511 kJ.mol −1 for WSB/MnFe 2 O 4 /ZIF-7 and WSB, respectively. Furthermore, the Langmuir isotherm model demonstrated excellent fitting to the isotherm results, suggesting the dominance of homogeneous surfaces in adsorption. The maximum adsorption capacities for Co 2+ using WSB/MnFe 2 O 4 /ZIF-7 and WSB were determined to be 29.26 and 22.39 mg.g −1 , respectively. The WSB/MnFe 2 O 4 /ZIF-7 magnetic composite demonstrates promising potential for efficiently removing Co 2+ from both natural water sources and industrial wastewater, highlighting its versatility and effectiveness in environmental remediation applications.
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
高影响因子
FOOD SCIENCE AND BIOTECHNOLOGY
·
2015
·Vol. 24
·期 4
·1257-1263
·
IF 0.653
Huang Yechuan,Wu Zhaomin,Wang Yanrong,Li Feng
To investigate the effects of pressure and temperature on lipoxygenase (LOX) in meat, changes in LOX activities in minced pork and in crude enzyme extracts under different conditions of pressure (131.82–468.18 MPa), temperature (23.18–56.82°C), and duration (6.59–23.41 min) were evaluated using response surface methodology. LOX activities in extracts exhibited a decrease with an increasing treatment temperature, pressure, or duration. Each of these factors alone had a significant ( p <0.05) effect on LOX activities. Activation of LOX in most minced pork treated at less than 400 MPa was observed. Treatment pressure and temperature, and interactions between pressure and temperature and between duration and pressure, significantly ( p <0.05) affected LOX activities. LOX showed higher stability in muscles than in extracts during combined pressure-heat treatments. The most important factor affecting LOX was treatment temperature for extracts and treatment pressure for muscles.
研究领域:
食品科学
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生物化学
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DOI
高影响因子
ACS Applied Electronic Materials
·
2020
·
IF 0
Ping Zhang,Qi Li,Yihang Xiao,Canhui Yang
Recent advances in integrating elastomers and hydrogels have enabled numerous emerging and promising applications in ionotronics, soft machines, and soft robotics. A challenge has emerged to integrate elastomers and hydrogels of intricate configurations in various manufacturing processes. Here, a biomimetic strategy is reported to enable the integration of elastomers and hydrogels with regulable curved profiles. To do so, hydrophilic islands are imparted on the hydrophobic surface of an elastomer to allow the regulation of the profiles of the precursor, which can be cured into a hydrogel with high degree of fidelity of the profile and robust adhesion between the hydrogel and the elastomer. Parametric investigations pertaining to the diameter of the hydrophilic island and the volume of the liquid are first carried out to construct the designing space, which is then applied to a hydrogel precursor. An ionotronic luminescent array that can selectively light up in response to various extents of compression is fabricated. A soft tunable lens whose focal length can be mediated by the profile and mechanical stretch is also demonstrated. The proposed approach paves avenues for integrated elastomer–hydrogel hybrid systems.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 35
·18098-18104
·
IF 7.443
Xiaogang Li,Mumin Rao,Haibin Lin,Dongrui Chen,Yanlin Liu,Shizhu Liu,Youhao Liao,Lidan Xing,Mengqing Xu,Weishan Li
We report a composite (CG-S@PANI), sulfur (S) loaded in curved graphene (CG) and coated with conductive polyaniline (PANI), as a cathode for lithium–sulfur batteries. CG is prepared by splitting multi-wall carbon nanotubes and loaded with S via chemical deposition and then coated with polyaniline via in situ polymerization under the control of ascorbic acid. The physical and electrochemical performances of the resulting CG-S@PANI are investigated by nitrogen adsorption–desorption isotherms, X-ray powder diffraction, thermogravimetric analysis, transmission electron microscopy, electrochemical impedance spectroscopy, charge–discharge tests, and electronic conductivity measurements. CG-S@PANI as a cathode for lithium–sulfur batteries delivers an initial discharge capacity of 851 mA h g−1 (616 mA h g−1 on the basis of the cathode mass) at 0.2 C with a capacity retention of over 90% after 100 cycles. This nature is attributed to the co-contribution of CG and conductive PANI to the concurrent improvement in electronic conductivity and chemical stability of the sulfur cathode.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
FOOD SCIENCE AND BIOTECHNOLOGY
·
2017
·Vol. 26
·期 1
·143-152
·
IF 0.699
Chen Peng,Yan Lei,Zhang Shuang,Wu Zhengrong,Li Suyue,Yan Xiaojuan,Wang Ningbo,Liang Ning,Li Hongyu
A stirring bioreactor packed with a carbon fiber textiles (FT) biofilm formed by Bacillus subtilis was used to produce vanillin from ferulic acid. Biofilm formation was characterized by scanning electron microscopy. The interactive effects of three variables on vanillin molar yield (M) and conversion efficiency of ferulic acid (E) were evaluated by response surface methodology (RSM) with a Box-Behnken design (BBD). The optimal conversion conditions with a maximum overall desirability D of 0.983 were obtained by a desirability function. Considering the actual operation, the confirmation tests were performed using the slightly modified optimal conditions (initial ferulic acid concentration 1.55 g/L, temperature 35°C, stirring speed 220 rpm). The results showed that M and E were 57.42 and 93.53%, respectively. This was only 1.03% and 1.87%, respectively, different from the predicted values, confirming the validity of the predicted models. These revealed that the stirred packed reactor could be successfully used in vanillin bioconversion from ferulic acid.
研究领域:
生物工程
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微生物学
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产品关联
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2017
·Vol. 121
·期 2
·579-592
·
IF 1.264
Zhang Hui,Li Yuqi,Lu Zexiang,Wu Mei,Shi Ronghui,Chen Lihui
Five SO 3 H and CF 3 SO 3 H-functionalized ionic liquids (ILs) with different acidity were synthesized. The catalytic performances of various ILs were evaluated for producing biodiesel in the esterification reaction and the yield of biodiesel increased with the increase of ILs’ acid strength. [Bsmim]CF 3 SO 3 was found to be a highly-efficient catalyst for increasing the biodiesel yield due to its greatly enhanced Brønsted acidity, and it was also an environmental friendly solvent for its good recyclability and hydrophilicity. The experimental design and study were carried out by using the response surface methodology (RSM) for optimizing the production process. The optimum biodiesel yield of nearly 99% was achieved at the conditions that the catalyst amount of 11%, the molar ratio of methanol to oleic acid of 9:1, the reaction time of 3 h and the reaction temperature of 62 °C were used. In addition, the catalyst showed an excellent reusability.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2022
·
IF 7.758
Yingnan Wang,Zhanbin Huang,Linlin Sheng,Mengmeng Zhao,Junyi Feng
Humic acid (HA) has led to promising developments in the improvement of soil remediation. The low utilization efficiency of the residue produced in the proceeding of HA production causes environmental pollution and the waste of resources. The humic acid residue (HAS) was used as the feedstock for the preparation of an NH 4 H 2 PO 4 modified material (NH 4 H 2 PO 4 -HAS) adsorbent for the adsorption of Pb 2 + in aqueous solutions. Response surface methodology (RSM) using the Box-Behnken design(BBD) to investigate the effects of concentration, temperature, and volume on the adsorption effectiveness of Pb 2 + by the modified material. The optimal parameters of the modified materials are as follows: concentration of NH 4 H 2 PO 4 3%volume 27.7 mL, temperature 71.8 °C. The adsorption equilibrium shows a well fit with the Langmuir isotherm model. The maximum adsorption amounts of Pb 2 + by HAS and NH 4 H 2 PO 4 -HAS composites were 272.185 mg/g and 343.166 mg/g, respectively; the kinetic adsorption data of HAS and NH 4 H 2 PO 4 -HAS exhibit a well fit with the pseudo-second-order model. The desorption of NH 4 H 2 PO 4 -HAS was less than that of HAS at different temperatures and pH. The thermodynamic parameters, Δ Hº, Δ Gº, and Δ Sº, obtained from the isotherm data indicate that the process of Pb 2 + adsorption by HAS and NH 4 H 2 PO 4 -HAS is spontaneous and the uptake of Pb 2 + by HAS and NH 4 H 2 PO 4 -HAS composite is more favored at high temperatures. The adsorption mechanism of NH 4 H 2 PO 4 -HAS on Pb 2 + mainly includes physical adsorption, surface complexation adsorption, and precipitation.
研究领域:
环境科学
·
土壤修复
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产品关联
DOI
高影响因子
Foods
·
2023
·Vol. 12
·期 16
·3029
·
IF 5.2
Yuhang Gao,Yanzhao Zheng,Fei Yao,Fusheng Chen
The aqueous enzymatic method is a form of green oil extraction technology with limited industrial application, owing to the need for the demulsification of the oil body intermediate product. Existing demulsification methods have problems, including low demulsification rates and high costs, such that new methods are needed. The free fatty acids produced by lipid hydrolysis can affect the stability of peanut oil body (POB) at a certain concentration. After screening even-carbon fatty acids with carbon chain lengths below ten, caproic acid was selected for the demulsification of POB using response surface methodology and a Box–Behnken design. Under the optimal conditions (caproic acid concentration, 0.22%; solid-to-liquid ratio, 1:4.7 (w/v); time, 61 min; and temperature, 79 °C), a demulsification rate of 97.87% was achieved. Caproic acid not only adjusted the reaction system pH to cause the aggregation of the POB interfacial proteins, but also decreased the interfacial tension and viscoelasticity of the interfacial film with an increasing caproic acid concentration to realize POB demulsification. Compared to pressed oil and soxhlet-extracted oil, the acid value and peroxide value of the caproic acid demulsified oil were increased, while the unsaturated fatty acid content and oxidation induction time were decreased. However, the tocopherol and tocotrienol contents were higher than those of the soxhlet-extracted oil. This study provides a new method for the demulsification of POB.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
Chem
·
2024
·
IF 19.1
Yang Yang,Guohua Yao,Xiaojuan Zhu,Meiqi Gao,Lili Wang,Shunlin Li,Xuerong Li,Xuezhi Duan,De Chen,Weimin Yang,Ying Wan
Selective hydrogenation of phenol is a sustainable alternative to cyclohexane oxidation for the production of cyclohexanone. However, over-hydrogenation of cyclohexanone to cyclohexanol is thermodynamically favorable, limiting its selectivity. Here, we report an unprecedented cyclohexanone selectivity (>99.9%) in continuous-flow phenol hydrogenation using an electron-deficient Pd catalyst. The Pd atom exists in a unique Pd–N 5 C 4 structure in which it is coordinated with four quasi-planar N atoms and one axial N atom in the first shell and an additional four C atoms in the second shell that lie on the curved surface of a pore in ordered mesoporous carbon. The Pd site has a d charge depletion of 1.18 e that prevents cyclohexanone adsorption, which is therefore exclusively produced. Bonding the Pd atom to a curved plane of carbon atoms is an effective way to control the d charge of Pd and increase its selectivity for the green synthesis of fine chemicals.
研究领域:
化学工程
·
催化科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Case Studies in Construction Materials
·
2022
·
IF 4.934
Yun Shen,Jing Lu,Changcai Cui
The grinding and polishing of curved stone involve many steps, limiting the process's efficiency. This study proposes a one-step grinding and polishing process to simplify the process and achieve efficient machining. It is achieved by developing the grinding and polishing tools and realizing the entire process on the robotic processing platform, and the tool design is based on the surface roughness of the machined workpiece. The grinding tool is made by selecting the appropriate glue to achieve the connection from carving to polishing. Similarly, the polishing tool is made by selecting the appropriate gel compound system to achieve a high glossiness curved stone surface. The results show that the grinding tool made of epoxy resin YT-CC301 can reduce the curved stone's roughness from 16.281 µm to below 400 nm, and the connection from carving to polishing can be realized by one step. The polishing tool made of sodium alginate and carboxylated chitosan gel compound system or sodium alginate and sodium carboxymethyl cellulose gel compound system can polish the surface of the ground curved stone to the roughness of less than 15 nm, and the surface glossiness can reach more than 120. Therefore, a single step of grinding and polishing of curved stone is achieved.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Weidong Lu,Zihao Xu,Meiyuan Li,Youheng Ma,Zijun Xiao
Deacidification is a critical step in alkali catalyzed transestrification of acidic oil for biodiesel production. In this work, optimization of the process variables and insights into the mechanisms of deep eutectic solvent (DES) assistance of deacidification of acidic oil catalyzed by Amberlyst 15 were investigated. Specifically, response surface methodology (RSM) and Box-Behnken Design (BBD) were employed to optimize the three process variables, namely temperature, catalysis loading, and molar ratio of methanol to oleic acid . Furthermore, the catalysts before and after used with and without DES assistance were characterized by FTIR and XRD in order to elucidate the chemical mechanisms involved in the process. Results showed that maximum deacidification rate (DR) of 98.02% was achieved in the deacidification process assisted by DES at the optimal process conditions (temperature 72.02ºC, catalyst loading 5.05 wt%, and methanol to oleic acid molar ratio 33.02), compared to 89.68% of the control (without DES assistance). Data analysis and verification results further confirmed the suitability of BBD and RSM methods in optimizing the process. More interestingly, dramatic higher catalytic activity (DR of 76.33% vs 64.16%) of Amberlyst 15 with DES assistance compared to that of the control after 4 cycles was observed. Finally, FTIR spectra confirmed that less water absorbed onto the surface of Amberlyst 15 with DES assistance was the major reason for higher DR and better catalyst reusability in comparison with the control.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）