RSC Advances
·
2016
·Vol. 6
·期 49
·42854-42862
·
IF 3.289
He Liu,Aiting Wang,Xu Xu,Mengmeng Wang,Shibin Shang,Shiwei Liu,Jie Song
Cellulose aerogels based on crosslinking of cellulose with 1,4-butanediol diglycidyl ether (BDE) were homogeneously synthesized in NaOH/urea aqueous solution followed by freeze-drying. In the NaOH/urea aqueous solution, cellulose existed in a sodium alkoxide form that could react with the epoxide groups of BDE. The rheological behavior of the cellulose/NaOH/urea aqueous solution showed that the crosslinking reaction occurred immediately once the BDE was added to the cellulose/NaOH/urea aqueous solution at room temperature. The X-ray diffraction (XRD) characterization identified a transition from the crystalline structure of cellulose to an amorphous state of cellulose aerogels with increasing amount of BDE. Elemental analysis revealed the variation in carbon and oxygen elemental percentages in cellulose aerogels caused by the reaction between cellulose and BDE. The porous network of aerogels was observed by scanning electron microscopy (SEM) and the pore size of the aerogels increased as a function of BDE. The water adsorbent ability of aerogels was up to 41 g g−1—even after 30 squeezing–adsorption cycles, the water adsorbent ability was still 37 g g−1.
研究领域:
高分子材料科学
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纳米材料学
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绿色化学
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生物基功能材料
·
环境功能材料
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Shi-yu Feng,Kai Li,Zhu-yu Li,Dong-hong Nan,Yan-qin Huang,Ji Liu,Qiang Lu
A green way for the sustainable utilization of waste polycarbonate (PC) was developed, i.e., NaOH solution-assisted pyrolysis to co-produce phenolic compounds and supercapacitor material. A lab-scale setup was employed for the pyrolysis of PC to explore the regulation effects of NaOH concentration and pyrolytic temperature on the production of phenol and 4-isopropenylphenol (IPP). The yields of phenol and IPP were up to 35.3 wt% and 29.9 wt% at 600 °C and NaOH concentration of 0.5 mol/L, which were much higher than those from pure PC pyrolysis (7.2 wt% and 3.6 wt%). Furthermore, the pyrolytic solid residue was directly subjected to the high-temperature activation to prepare activated carbon, which could be used as a supercapacitor material with an outstanding specific gravimetric capacitance of 182.1 F/g at 1 A/g.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·
IF 2.93
M. Gong,W. Zhu,H.W. Zhang,Q. Ma,Y. Su,Y.J. Fan
Dewatered sewage sludge was treated with NaOH additive and Ni catalyst in supercritical water in a high-pressure autoclave to examine the effects of separate and combined NaOH additive and Ni catalyst on hydrogen generation . The effects of Ni/NaOH ratio on hydrogen production were also investigated to identify possible catalytic mechanism and interactions. NaOH and Ni, separately or in combination, improved the hydrogen production and hydrogen gasification efficiency. The addition of NaOH additive not only promoted the water–gas shift reaction, but also favored H 2 generation of Ni catalyst by capturing CO 2 . The hydrogen yield of combined catalysts with different Ni/NaOH ratios was higher than the theoretical sum of hydrogen yield from the mixture by 10–33%. The largest hydrogen yield, of 4.8 mol per kilogram of organic matter, which was almost five times as much as without catalyst, was achieved with the addition of 3.33 wt% Ni and 1.67 wt% NaOH. The combined NaOH additive and Ni catalyst also improved the gasification of several other dewatered sewage sludges, increasing the hydrogen yield by four to twelve times that seen without catalyst. Combined NaOH additive and Ni catalyst are effective in dewatered sewage sludge gasification at low temperature.
研究领域:
环境工程
·
能源科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 3
·1-12
·
IF 2.253
Mao Xisong,Xia Xuewen,Ning Deyang,Li Junqi,Chen Chaoyi,Lan Yuan-Pei
Molten salts synthesis (MSS) is a simple and potential technique for ceria nanoparticles (NPs) production, but the relevant effects of salt medium and cerium precursor on the synthesized ceria NPs need further attention. In the present work, we investigated the influences of frequently employed KCl–LiCl and KOH–NaOH molten flux and typical inorganic cerium precursors on the characterizations and photocatalytic property of ceria NPs. Results show that the CeO 2 NPs obtained in molten KOH–NaOH flux have smaller particle/crystal sizes but more serious agglomeration than that from KCl–LiCl flux. UV–Vis DRS spectra reveal that the ceria synthesized in molten hydroxides from the cerium nitrate precursor has the narrowest band gap of 2.87 eV in studied ceria samples. The ceria NPs obtained from KCl–LiCl flux have wider band gaps of 3.15–3.29 eV and faster recombination rates of photo-generated e − and h + . It was found that the ceria NPs obtained in molten KCl–LiCl salt show better photocatalytic activities for methylene blue (MB) degradation and may be due to the uniform size distribution and well-dispersed particles.
研究领域:
材料科学
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化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 8
·631
·
IF 5.3
Yuxi Wang,Yong Yu,Shuhan Hu,Jinyao Yu,Yue Huang,Hongjie Dai
Pineapple peel cellulose nanofibrils (PCNFs) were facilely prepared by the ball milling method assisted by alkali solution (3 wt% NaOH) and a wet grinding medium, using various treated pineapple peels (hot water treatment (WT), bleaching treatment (BT), alkaline treatment (AT), and baleaching–alkaline treatment (ABT)) as raw materials. The structure of the obtained PCNFs (i.e., WT-PCNF, BT-PCNF, AT-PCNF, and ABT-PCNF) was characterized to analyze the influence of component intervention. The results indicated that NaOH-assisted ball milling did not change the crystal structure of cellulose, and the yield and thermal stability of the PCNFs was improved. The average diameters of WT-PCNF, BT-PCNF, AT-PCNF, and ABT-PCNF were 24.16, 21.53, 23.04, and 19.46 nm, respectively, in which BT-PCNF and ABT-PCNF exhibited a higher defibrillating degree and smaller diameter. Particularly, NaOH-assisted ball milling can promote the removal of non-cellulose components. The viscosity and modulus of BT-PCNF were relatively higher due to the presence of residual hemicellulose as a natural linker of fibers. The current research provides insights for simplifying the preparation and functionalization of nanocellulose.
研究领域:
材料科学
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纳米技术
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生物高分子工程
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可持续材料
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废物资源化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Zhiliang Cui,Guoren Xu,Banu Ormeci,Jiayin Hao
This study synthesized novel magnetic biochar (PCMN600) by KMnO 4 –NaOH combined modification using iron-containing pharmaceutical sludge to remove toxic metals from wastewater effectively. Various characterization experiments of engineered biochar showed that the modification process introduced ultrafine MnO x particles on the carbon surface and resulted in higher BET surface area and porosity along with more oxygen-containing surface functional groups. Batch adsorption studies indicated that the maximum adsorption capacities of PCMN600 for Pb 2+ , Cu 2+ and Cd 2+ were 181.82 mg/g, 30.03 mg/g and 27.47 mg/g, respectively, at a temperature of 25 °C and pH of 5.0, which were much higher than that of pristine biochar (26.46 mg/g, 6.56 mg/g and 6.40 mg/g). The adsorption datums of three toxic metal ions fitted well to the pseudo-second-order model and Langmuir isotherm, and the sorption mechanisms were identified as electrostatic attraction, ion exchange, surface complexation, cation-π interaction and precipitation. The strong magnetic properties of the engineered biochar endowed the adsorbent with remarkable reusability, and after five cycles of recycling, PCMN600 still retained nearly 80% of its initial adsorption capacities.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 41
·22278-22288
·
IF 14.511
Junji Chen,Wenjing Qin,Kun Li,Lei Feng,Jianxing Chen,Hanying Qiao,Min Yang,Zhenhao Tian,Xinxin Li,Changshun Gu,Yanli Wang,Zheng Gong,Shougen Yin
Ti3C2Tx MXene has a high specific surface area and high conductivity, and can be used in the field of humidity sensing. By controlling the surface termination and microstructure of the material, it is expected to improve the humidity sensing performance of Ti3C2Tx MXene. In this paper, we report a method of electrolytic intercalation treatment of Ti3C2Tx MXene in NaOH solution. Theoretical and experimental results show that this method can remove the original F terminations from the surface of Ti3C2Tx MXene and form a large number of OH and O terminations. The partial oxidation of the surface and the replacement of terminations and the insertion of Na+ lead to the change of the Ti3C2Tx MXene layer morphology from flat to curly and significantly improve the hydrophilicity and resistance. The curly flake structure constructs a fast channel for the entry and exit of water molecules which improves the hydration/dehydration efficiency of the material; the enhanced hydrophilicity of the material sharply reduces the resistance of the material after moisture absorption, which significantly improves the responsiveness of Ti3C2Tx MXene to humidity. The curly flake Ti3C2Tx MXene humidity sensor has an ultra-high sensitivity of S = 1.2 × 105 (two orders of magnitude higher than that of the reported humidity sensor based on MXene), with a fast response rate (2 s), good repeatability and stability (4 weeks), and it can be used for the analysis of human respiration rate, and also for non-contact sensing detection of the human body and environmental humidity detection.
研究领域:
材料科学
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传感技术
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纳米材料
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Tianfeng Han,Hui Xue,Xiaobo Hu,Ruiling Li,Huilan Liu,Yonggang Tu,Yan Zhao
In this paper, the effects of NaOH, NaCl, and heat on the appearance, physical characteristics, and gel structure of duck egg white (EW) jointly induced by NaOH, NaCl, and heat were investigated. Results showed that the absolute value of zeta potential (TAV-ZP) of gel samples increased, hunter whiteness decreased, gel opacity decreased, and the microstructure of gel appeared as a loose network structure with increased NaOH addition. With the increase of NaCl addition, TAV-ZP of gel samples decreased, hunter whiteness increased, gel opacity increased, the microstructure of gel became dense. With the increase of heating temperature, TAV-ZP of gel samples decreased, hunter whiteness decreased, gel opacity increased, the microstructure of gel became dense first and then loosened. The results of SDS-PAGE, surface hydrophobicity, T 2 , hardness, cohesiveness indicated that protein molecules underwent cross-linking, aggregation, and unfolding during duck EW gelation jointly induced by NaOH, NaCl, and heat. The results of strain-stress curve showed that all gel samples had a good anti-compressed ability. The results of central composite design showed that the best treatment of gel was heating temperature 91 °C, NaOH 0.48%, and NaCl 0.3%.
研究领域:
食品科学
·
化学
·
生物物理学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Hui Xue,Tianfeng Han,Guowen Zhang,Xiaobo Hu,Ruiling Li,Huilan Liu,Rui Li,Yonggang Tu,Yan Zhao
Salted preserved eggs are made using poultry eggs under the combined action of NaOH, NaCl, and heat. To elucidate the main basis and mechanism of the formation of salted preserved egg white, the effects of NaOH (0.5–2.5%), NaCl (0–1.2%), and heat (72–100 °C) on the properties of ovalbumin (the most abundant protein in poultry egg whites) gel were studied. With increasing NaOH addition, the pH and the absolute value of zeta potential (TAV-ZP) increased, the opacity and Hunter whiteness decreased, and the relaxation time (T 2 ) initially decreased and then increased. With increasing NaCl addition and heating temperature, the pH and TAV-ZP decreased, the opacity and Hunter whiteness increased, and T 2 decreased first and then increased. In addition, the hardness and cohesiveness of the ovalbumin gel were greatly modified by NaOH, NaCl, and heat. NaOH contributed to the formation of the gel network structure. In addition, the surface hydrophobicity (H 0 ) analysis result indicated that the tertiary structure of the ovalbumin had changed during the formation of the ovalbumin gel. The correlation analysis results showed that electrostatic repulsion played a vital role in the formation of the transparent ovalbumin gel, and the transparent ovalbumin gel possessed the following characteristics: low aggregation degree, high cross-linking degree, high immobilized water content, gel network structure, and the fully unfolded structure of ovalbumin molecules. In general, the ovalbumin formed a unique gel under the combined action of NaOH, NaCl, and heat. This study could provide theoretical guidance for the processing and control of salted preserved eggs and a reference for highly transparent egg white gel products.
研究领域:
食品科学
·
蛋白质化学
·
凝胶形成
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Angxin Tong,Jinyang Zhu,Qiang Zhang,Shuai Tian,Xiaojun Tang,Hong Chen,Feng Zhang
This paper aimed at putting forward an approach integrating the improved clustering by fast search and find of density peaks ( I-CFSFDP) algorithm with Ultraviolet (UV) spectroscopy for identifying the species of NaCl, NaOH, β-phenylethylamine(PEA) and their mixtures. For solving the issue that the clustering precision of the CFSFDP algorithm relies on the density forecast of the dataset and the manually selection of the truncated distance d c . The idea of kernel density forecast was adopted to the I-CFSFDP algorithm. The I-CFSFDP algorithm can observe the clusters of arbitrary shapes and use an adaptive method to evaluate the truncated distance d c , thereby generating more accurate clusters and identifying the core points in the clusters effectively. The dimensions of the UV spectra was reduced with principal component analysis (PCA), and the results of PCA were invoked as the input of the I-CFSFDP algorithm. Meanwhile, the effect of PCA-I-CFSFDP was evaluated by recall, accuracy, F-Score and precision. Besides, the DBSCAN and PCA-CFSFDP algorithms were used to compare with the PCA-I-CFSFDP algorithm. All of the classification outcomes displayed that the PCA-I-CFSFDP algorithm has better performance than the DBSCAN and PCA-CFSFDP algorithms. Therefore, the PCA-I-CFSFDP algorithm integrated with UV spectroscopy is a simple, quick and credible identification approach for detecting PEA, NaCl, NaOH and the mixtures.
研究领域:
化学计量学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Chemistry and Pharmacy
·
2022
·
IF 5.464
Xianqiang Chen,Xinyu Chu,Xue Li,Fuliang Cao,Qirong Guo,Jiahong Wang
In this study, a novel method for extraction saponins from Xanthoceras sorbifolium Bunge leaves (XLs) was developed using ultrasonic-assisted ionic liquid combined with in situ alkaline aqueous biphasic systems (UAE-IL-AABS). UAE-IL was firstly used to extract saponins from XLs, followed by removal of the phenolic impurities using in situ IL-AABS. A Box-Behnken Design (BBD) was used to analyze the [C 4 MIM]BF 4 concentration, time, liquid/solid ratio, and power on the saponins yield. Under the optimal conditions with [C 4 MIM]BF 4 concentration 2.3 M, time 19.9 min, liquid/solid ratio 24.9:1 (mL/g), and power 165 W, the saponins yield was 8.17%, which was 11.01% higher than ultrasonic assisted ethanol extraction method. The major compounds in UAE-IL were also identified using UPLC-MS/MS. Moreover, the optimized conditions of IL-AABS with recovery rate of saponins was 96.70%. Finally, a low extraction time, and favorable impurities removal efficiency and recyclability suggested UAE-IL-AABS is greener for production in the food, medicine, and chemical industry.
研究领域:
化学工程
·
药学
·
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Ying Liu,Xiangjin Liang,Jun Lu,Yapeng Chen,Jun Liu,Baoying Wang,Ruixue Ma,Junchen Xu,Jun Cheng
How to utilize low-cost easily-acidified ammonium sulfate, a byproduct of coking industry, to farm microalgae for CO2 fixation is a difficult problem. Ammonium sulfate was mixed with sodium nitrate to cultivate Nannochloropsis oceanica at stable pH using HEPES-NaOH for solving acidification problem, and downregulate assimilatory nitrate reduction to save energy for improving carbon sequestration. Transcriptomic sequencing showed that nitrate assimilation consumed much ATP and reductivity derived from photosystem I, and competed with Calvin cycle for energy to limit CO2 fixation rate of microalgae in conventional nitrate medium. However, pure ammonium culture attenuated GS/GOGAT cycle (a main pathway for ammonium assimilation and amino acids synthesis) to limit nitrogen utilization rate of microalgal cells. In the mixed ammonium and nitrate supply modes, nitrogen metabolic pathway was down-regulated, while the Calvin cycle pathway was up-regulated to improve CO2 fixation. Nitrate reduced the extent of up-regulation of the ammonium transporter to prolong effective utilization time of ammonium. Asparagine synthetase activity in accessorial pathway of nitrogen assimilation substantially increased, while asparaginase was down-regulated to avoid harmful overaccumulation of ammonium in the cell. Down-regulation of tricarboxylic acid cycle attenuated intermediate 2-oxoglutarate shift to ammonium assimilation and improved efficiency of nitrogen utilization. The optimum condition for microalgal growth was at total nitrogen concentration of 5.28 mM and a nitrate to ammonium molar ratio of 2:3. Compared with the control (2.64 mM nitrate), the maximum photosynthetic electron transfer efficiency rETR increased by 34.9%, chlorophyll a concentration increased by 110% and average biomass growth rate increased by 33.7%.
研究领域:
微藻生物技术
·
环境生物技术
·
植物生理学
·
生物信息学
·
海洋生物技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）