检索结果-南通市图书馆

Catalytic fast pyrolysis of walnut shell for alkylphenols production with nitrogen-doped activated carbon catalyst

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2021年第2期15卷 95-105页

作者： Shanwei Ma Hang Li Guan Zhang Tahir Iqbal Kai Li Qiang Lu State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Faculty of Agricultural Engineering&Technology PMAS-Arid Agriculture UniversityRawalpindi 46000Pakistan

Alkylphenols are a group of valuable phenolic compounds that can be derived from lignocellulosic *** this study,three activated carbons(ACs)were prepared for catalytic fast pyrolysis(CFP)of walnut shell to produce alkylphenols,including nitrogen-doped walnut shell-derived activated carbon(N/WSAC),nitrogen-doped rice husk-derived activated carbon(N/RHAC)and walnut shell-derived activated carbon(WSAC).Pyrolysis-gas chromatography/mass spectrometry(Py-GC/MS)experiments were carried out to reveal the influences of AC type,pyrolytic temperature,and AC-to-walnut shell(AC-to-WS)ratio on the product *** showed that with nitrogen doping,the N/WSAC possessed stronger capability than WSAC toward the alkylphenols production,and moreover,the N/WSAC also exhibited better effects than N/RHAC to prepare *** the catalysis of N/WSAC,yields of alkylphenols were significantly increased,especially phenol,cresol and *** the increase of pyrolytic temperature,the alkylphenols yield first increased and then decreased,while high selectivity could be obtained at low pyrolytic *** a trend was also observed as the AC-to-WS ratio continuously *** alkylphenols production achieved a maximal yield of 44.19 mg/g with the corresponding selectivity of 34.7%at the pyrolytic temperature of 400℃and AC-to-WS ratio of 3,compared with those of only 4.67 mg/g and 6.1%without *** addition,the possible formation mechanism of alkylphenols was also proposed with the catalysis of N/WSAC.

关键词： Pyrolysis walnut shell Alkylphenols Nitrogen-doped activated carbon

Synthesis of Modified walnut shell Biochar and Its Performance of Cadmium Adsorption

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2023年第9期11卷 317-332页

作者： Jiankun Chen Jianan Wang Hefei No. 1 High School Hefei China Department of Science and Scientific Archaeometry University of Science and Technology of China Hefei China Research Center for Science and Technology Innovation and Regional Development University of Science and Technology of China Hefei China

Biochar is a functional and environmentally friendly material mainly made from by-products of industrial and agricultural production as raw material, which is cracked at high temperatures and slow speeds. The preparation of biochar requires the thermochemical conversion of biomass in an oxygen-restricted environment. Different raw materials and preparation processes result in biochar with different internal structures and biofunctional groups, which often have different properties. Adsorption of heavy metal pollutants is one of the main research directions for biochar application, and there are still areas that can be improved in the current research for biochar for treating heavy metal wastewater. In this study, we take the treatment of cadmium-containing wastewater as an example, walnut shell biochar (WSBC) as a carrier, iron(VI) compounds as a modifying reagent, and test the performance of cadmium-containing wastewater treatment using simulated cadmium-containing wastewater by adjusting the pyrolysis process and modification method at the same time to find the optimal experimental scheme, and give a reasonable theoretical explanation in relation to the results of the characterization tests, such as SEM, FT-IR, and so on. The characterized results show that iron(VI) compound (K2FeO4)-modified WSBC has a significant ability to remove cadmium contamination in the wastewater (remove 96.62% of cadmium in 1 minute), and its structure is different from other iron compound-modified ones. The aim of this study is to improve the efficiency of cadmium adsorption by specific types of biochar, while realizing the whole process as environmentally friendly as possible.

关键词： Biochar Wastewater Cadmium Environmental Pollution walnut shell

Adsorption of Basic Dyes Using walnut shell-based Biochar Produced by Hydrothermal Carbonization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2018年第4期34卷 622-627页

作者： KANG Chunli ZHU Ling WANG Yixue WANG Yuhan XIAO Kunkun TIAN Tao Key Laboratory of Groundwater Resources and Environment(Jilin University) Ministry of Education Jilin University Changchun 130012 P. R. China

Hydrothermal carbon（HC） was prepared from walnut shells, which are abundant in Northeastern China. The prepared HC was used as a precursor to produce mtric acid modified carbon（MC）. The hydrothermal carbonization included dehydration and decarboxylation processes wherein the hemicellulose was completely decomposed and the celhilose was partly decomposed, with some oxygen-containing functional groups being produced. The aromati- city, specific surface area and pore content of the HC increased, but its polarity decreased. With 6 mol/L nitric acid and a modification time of 15 min, the specific surface area and pore content decreased, but the proportion of oxy- gen-containing fimctional groups on the surface increased significantly, thereby improving the dye adsorption performance. The adsorption of methylene blue and malachite green was best desclibed by the pseudo-second-order kinetic and Langmuir isotherm models. The adsorption capacity of MC was determined to be much larger than that of HC.

关键词： Biochar Adsorption walnut shell Hydrothemal carbonization Basic dye

Characterization of Unsaturated Polyester Filled with Waste Coconut shells, walnut shells, and Carbon Fibers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2023年第10期19卷 2449-2469页

作者： Marwah Subhi Attallah Reem Alaa Mohammed Ruaa Haitham Abdel-Rahim Department of Materials Engineering University of Technology-IraqBaghdadIraq

This study aims to evaluate the erosion behavior and the hardness of hybrid composites made of varying amounts of coconut shells,walnut shells,and carbonﬁbers dispersed in a polyester ***(L16)Taguchi experiments were used to determine the optimal combination of *** particular,an erosion device con-sisting of a motor with a constantﬂow rate of 45 L/min,a pump with a diameter of 40 mm,a nozzle with a dia-meter of 5 mm,and a tank made of“perspex glass”55 cm long,30 cm tall,and 25 cm wide was *** tests were conducted by varying the sample-to-nozzle distance,the pattern angle,and the sand particle *** results have revealed that the presence of 7.5%by weight of waste coconut shell,for conditions corresponding to 90°angle,sand size 425μm,stand distance 30 cm,gives the best wear resistance(3.04×10^(-5) g/g).Theﬁller content and sand particle size affect the erosive rate,with the angle playing a secondary *** distance between the sample and the nozzle has a weaker effect on erosive *** hardness results show that the models(UP-5%carbonﬁber-2.5-3.5-4.5-5.5-6.5-7.5 wt.%waste coconut shell)give the best values for prayer compared to the samples(UP-5 wt.%carbonﬁber-2.5-3.5-4.5-5.5-6.5-7.5 wt.%waste walnut shell).

关键词： Unsaturated polyester resin carbonﬁber waste coconut shell walnut shell erosive behavior Taguchi’s method L16

Elutriation characteristics of multi-component mixtures in a fluidized bed pyrolysis process

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2021年第5期19卷 131-138页

作者： Xing Wu Jingbo Peng Yu Zhang Zhiduo Wang Aeronautics Engineering College Air Force Engineering UniversityXi’an 710038China

Multi-component mixtures were prepared to simulate a bed of walnut shells undergoing pyrolysis in acold fluidized *** mixtures with different ratios of walnut shell,semi-chars,and clean char were *** elutriation experiments using these mixtures were performed in a transparent fluidized bed to allow direct observation of the flow patterns and particle *** results indicated that the bubble wake rather than bubble nose was primarily responsible for particle entrainment at higher gas velocities,and that coarser particles would be“transformed”into elutriable *** gas velocities ranged from 0.2 to 1.0 and an exponential decrease in particle concentration with respect to bed height was *** transport disengagement height(TDH)gradually increased with the gas velocity until the entire bed layer enters a pneumatic transport ***,larger TDHs were required when the bed contained a larger fraction of light *** characteristic parameters were used to evaluate particle elutriation:the elutriation rate constant(K),and the residual volatile content of the elutriated particles(v′).These parameters were used to optimize operating gas velocity for the fluidized bed.

关键词： Fluidized bed Elutriation Multi-component mixture walnut shell Pyrolysis