共查询到20条相似文献,搜索用时 649 毫秒
1.
Mortazavi-Derazkola Sobhan Yousefinia Ali Naghizadeh Ali Lashkari Sajad Hosseinzadeh Mostafa 《Journal of Polymers and the Environment》2021,29(11):3539-3547
Journal of Polymers and the Environment - Nowadays, many chemical methods have been proposed for the synthesis of silver nanoparticles, but green synthesis has received more attention due to its... 相似文献
2.
When a recombinantEscherichia coli XL1-Blue harboring pSYL105 was cultured in a complex medium, a poly(3-hydroxybutyric acid) (PHB) concentration of 7.16 g/L was obtained in 48 h. However, a PHB concentration of only 0.91 g/L was obtained in 60 h by culturing in a defined medium. Also, fed-batch culture in a defined medium resulted in considerably lower PHB accumulation than in a complex medium. With the aim to produce a high concentration of PHB at a reduced medium cost, we examined 10 complex nitrogen sources for their ability to promote PHB synthesis in a defined medium. Tryptone, casamino acids, and casein hydrolysate promoted PHB synthesis to a higher extent than the others tested. PHB synthesis was also enhanced during fedbatch cultures when a defined medium was supplemented with various complex nitrogen sources. With tryptone supplementation a PHB concentration of 66.7 g/L could be obtained in 44 h. Yeast extract was less effective for promoting PHB synthesis than tryptone. Corn steep liquor, which did not enhance PHB synthesis significantly, could promote PHB synthesis considerably when supplemented together with yeast extract in both flask and fed-batch cultures. 相似文献
3.
Pablo Jiménez-Bonilla Jessica Salas-Arias Marianelly Esquivel Jose Roberto Vega-Baudrit 《Journal of Polymers and the Environment》2014,22(3):393-397
In Costa Rica, a lot of pineapple (Ananas comosus) and banana (Musa AAA) agroindustrial residues are generated each year. These residues can be used to obtain l-lactic acid by fermentation, ultrafiltration and electrodialysis. Poly(l-lactic acid) (PLLA) is a biodegradable and renewable polyester with many industrial and biomedical applications. There is a growing interest to improve the energetic efficiency of the synthesis of PLLA, because the main issue to produce this polymer is the high productive cost compared with petrochemical traditional commodities. In this research, the synthesis of PLLA through two different techniques was compared: microwave-assisted and conventional heating. On microwave synthesis the best results were obtained using lower temperatures and lower reaction times than the conventional heated synthesis. The reaction time was reduced from 15 h by conventional heating to 4.5 h using microwave-assisted synthesis. 相似文献
4.
5.
为准确核定石化企业火炬气NOx的排放情况,采用模拟火炬燃烧装置对现场采集的不同种类火炬气进行燃烧,取得了燃烧温度及NOx排放数据。实验结果表明:火炬气的燃烧温度及燃烧烟气中的NOx质量浓度与火炬气组分中H2的体积分数呈正相关;兰炭荒煤气、煤甲醇合成驰放气、合成氨变换气和合成氨合成解析气的燃烧温度分别为410,430,560,650℃。通过计算得到4种火炬气的NOx排放系数分别为:合成氨合成解析气0.3154~0.5406kg/t,煤甲醇合成驰放气0.1245~0.2263kg/t,合成氨变换气0.0591~0.0813kg/t,兰炭荒煤气0.0801~0.1762kg/t。 相似文献
6.
Journal of Polymers and the Environment - The bio-based acoustic materials have flourished with the future depletion of petroleum resources in recent years. This paper dedicates on the synthesis of... 相似文献
7.
The utilization of captured CO2 as a part of the CO2 capture and storage system to produce biopolymers could address current environmental issues such as global warming and depletion of resources. In this study, the effect of feeding strategies of CO2 and valeric acid on cell growth and synthesis of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] in Cupriavidus necator was investigated to determine the optimal conditions for microbial growth and biopolymer accumulation. Among the studied CO2 concentrations (1–20 %), microbial growth and poly(3-hydroxybutyrate) accumulation were optimal at 1 % CO2 using a gas mixture at H2:O2:N2 = 7:1:91 % (v/v). When valeric acid was fed together with 1 % CO2, (R)-3-hydroxyvalerate synthesis increased with increasing valeric acid concentration up to 0.1 %, but (R)-3-hydroxybutyrate synthesis was inhibited at >0.05 % valeric acid. Sequential addition of valeric acid (0.05 % at Day 0 followed by 0.025 % at Day 2) showed an increase in 3HV fraction without inhibitory effects on 3HB synthesis during 4 d accumulation period. The resulting P(3HB-co-3HV) with 17–32 mol % of 3HV is likely to be biocompatible. The optimal concentrations and feeding strategies of CO2 and valeric acid determined in this study for microbial P(3HB-co-3HV) synthesis can be used to produce biocompatible P(3HB-co-3HV). 相似文献
8.
Erceg Tamara Brakus Gaja Stupar Alena Cvetinov Miroslav Hadnađev Miroslav Ristić Ivan 《Journal of Polymers and the Environment》2022,30(9):3737-3760
Journal of Polymers and the Environment - The paper presents the synthesis of hydrogels via free-radical polymerization, based on Chitosan (CS) grafted with Acrylic acid (AA), using a two-step... 相似文献
9.
Aljohny Bassam Oud Almaliki Abdullah Abdulaziz Ali Anwar Yasir Ul-Islam Mazhar Kamal Tahseen 《Journal of Polymers and the Environment》2021,29(10):3252-3262
Journal of Polymers and the Environment - In this research work, a green method of using Saussurea costus extract for the synthesis of silver nanoparticles (AgNPs) is developed. Analysis of the... 相似文献
10.
Wei Wu Katsuya Kawamoto Hidetoshi Kuramochi 《Journal of Material Cycles and Waste Management》2006,8(1):70-77
The purpose of this study was to establish a fuel process for an advanced power generation system in which hydrogen-rich synthesis
gas, as the fuel for the molten carbonate fuel cell (MCFC), can be extracted from biomass via gasification and reforming technologies.
Experiments on waste wood gasification were performed using a bench-scale gasification system. The main factors influencing
hydrogen generation in the noncatalytic process and in the catalytic process were investigated, and temperature was identified
as the most important factor. At 950°C, without employing a catalyst, hydrogen-rich synthesis gas containing about 54 vol%
hydrogen was extracted from feedstock with appropriately designed operation parameters for the steam/carbon ratio and the
equivalence ratio. However, by employing a commercial steam reforming catalyst in the reforming process, similar results were
obtained at 750°C. 相似文献
11.
12.
淀粉基黄原酸盐合成新工艺及其在废水处理中的应用 总被引:11,自引:0,他引:11
研究了淀粉基黄原酸盐的合成新工艺,通过正交试验选定了最佳工艺条件。用该产品进行了电镀废水处理试验,去除重金属效果良好。 相似文献
13.
Konstantinos Kordatos Afroditi Ntziouni Lazaros Iliadis Vassilia Kasselouri-Rigopoulou 《Journal of Material Cycles and Waste Management》2013,15(4):571-580
The present study deals with the production and characterization of ZSM-5 zeolite under low temperature using amorphous rice husk ash as an alternative cheap silica source. Rice husk was combusted at various temperatures for the production of amorphous silica. The resulted amorphous silica ash was then utilized without any other treatment as a starting material for the synthesis of ZSM-5 zeolite using low temperature and under atmospheric pressure. For comparison, the high-temperature synthetic approach, the hydrothermal treatment under high temperature and autogenous pressure with the autoclave process, was also applied for the synthesis of ZSM-5 zeolite. The low-temperature method led successfully to the synthesis of highly siliceous zeolite of type ZSM-5. The produced materials were characterized using a variety of analytical techniques, including X-ray diffraction, Fourier transformation infrared spectroscopy, thermogravimetry–differential thermogravimetry analyses, scanning electron microscopy, electron dispersion X-ray analysis and nitrogen porosimetry. The results show that the utilization of an industrial by-product in abundance as a starting material can lead through a simple inexpensive technique to the synthesis of a high value added microporous material with many potential applications. 相似文献
14.
Journal of Polymers and the Environment - Chitosan biopolymer was extracted from chitin and utilized for the synthesis of CaNiFe2O4/Chitosan as a new magnetic nanocomposite. The structural and... 相似文献
15.
Ali Anwer Garg Utsav Khan Kashif Ullah Azim Yasser 《Journal of Polymers and the Environment》2022,30(10):4435-4451
Journal of Polymers and the Environment - The synthesis of an efficient catalytic system with a safe catalysis approach has always been the concern of researchers to eradicate the problems arising... 相似文献
16.
17.
The Integrated Battery Recycling (BATINTREC) process is an innovative technology for the recycling of used batteries and electronic waste, which combines vacuum metallurgical reprocessing and a ferrite synthesis process. Vacuum metallurgical reprocessing can be used to reclaim the mercury (Hg) in the dry batteries and the cadmium (Cd) in the Ni-Cd batteries. The ferrite synthesis process reclaims the other heavy metals by synthesizing ferrite in a liquid phase. Mixtures of manganese oxide and carbon black are also produced in the ferrite synthesis process. The effluent from the process is recycled, thus significantly minimizing its discharge. The heavy metal contents of the effluent could meet the Integrated Wastewater Discharge Standard of China if the ratio of the crushed battery scrap and powder to FeSO4.7H2O is set at 1:6. This process could not only stabilize the heavy metals, but also recover useful resource from the waste. 相似文献
18.
Mihail Ionescu Xianmei Wan Nikola Bili? Zoran S. Petrovi? 《Journal of Polymers and the Environment》2012,20(3):647-658
Cashew nut shell liquid (CNSL) is a natural aromatic oil consisting of a mixture of phenolic structures with a carboxyl group in ortho position and substituted in meta position with a hydrocarbon chain of 15 carbon atoms. The major component of CNSL is anacardic acid (90?%), which is easily decarboxylated to cardanol by distillation. The present work describes the synthesis of new biobased Mannich polyols for rigid polyurethane foams in two steps: synthesis of Mannich bases by reacting phenolic ring of cardanol with N-(2-hydroxyethyl)-1,3-oxazolidine followed by alkoxylation reactions. The polyols were characterized by wet methods (hydroxyl numbers, viscosity, acid value, density, water content, iodine value etc.), spectroscopic methods (FT-IR, 1H NMR and 13C NMR) and by Gel Permeation Chromatography. The Mannich polyols from cardanol are excellent replacements for petrochemical derived Mannich polyols based on nonyl phenol. Cardanol-based polyols were used successfully for the preparation of rigid polyurethane foams of good physical?Cmechanical and fireproofing properties. 相似文献
19.
Lin Ya-Wen Lee Wei-Hao Lin Kae-Long Cheng Ta-Wui Kuo Bo-Yi 《Journal of Material Cycles and Waste Management》2022,24(3):1009-1019
Journal of Material Cycles and Waste Management - This study outlines the synthesis of low-cost mesoporous silica nanomaterials (MSN) from stone sludge (SS) and silicon carbide grinding sludge... 相似文献
20.
Janusz Datta Kamila Błażek Marcin Włoch Radosław Bukowski 《Journal of Polymers and the Environment》2018,26(12):4415-4429
A new efficient method for the chemical decomposition of polyamide 6.6 by the glycolysis and amino-glycolysis processes was proposed. The glycolysis was conducted using the mass excess of ethylene glycol (EG) as a decomposing agent in the presence of a catalyst. Also, a mixture of EG and triethylenetetramine was used as another decomposing agent in the amino-glycolysis process. The described process of decomposition did not require the use of elevated pressure. The hydroxyl and amine numbers, rheology behavior and the presence of characteristic chemical groups in the obtained glycolysates and aminoglycolysates were determined in order to characterize the reaction products. The decomposition products were defined as non-Newtonian fluids that could be described by suitable mathematical models. The conducted studies showed that the properties of the obtained intermediates depend on the mass excess of the decomposing agent used. The resulting semi-products are suitable for reusing in the synthesis of polyurethanes, which has been confirmed by the exemplary synthesis. In the reaction, 10 and 15 wt% of commercial polyol were replaced with the recovered intermediates. 相似文献