检索结果-南通市图书馆

Journal of Renewable Materials 2019年第11期7卷 1197-1207页

作者： Hui Qiao Jingzhao Cui Shuiping Ouyang Jinjie Shi Jia Ouyang College of Chemical Engineering Nanjing Forestry UniversityNanjing210037China College of Forestry Nanjing Forestry UniversityNanjing210037China Key Laboratory of Forest Genetics and Biotechnology of the Ministry of Education Nanjing Forestry UniversityNanjing210037China

As an important agricultural waste,corn cob is one of the most abundant lignocellulosic *** this work,dilute acid pretreatment using seven different organic acids were compared for compositional analysis of corn *** first pKa of organic acids,influenced by the number and type of the side group and distance between two carboxylic groups,played a crucial role in the pretreatment *** acid was found to have better pretreatment performance than other tested dicarboxylic *** the condition of 30 mM,160°C and 60 min,the level of xylose reached 22.64 g/L in pretreatment liquid,and the pretreated corn cob demonstrated the high enhancement of enzymatic hydrolysis up to 93.4%and the ethanol yield was 73.6%.

关键词： corn cob organic acid pretreatment citric acid enzymatic hydrolysis bio-ethanol production

Production and Characterization of Green Biosorbent Based on Modified corn cob Decorated Magnetite Nanoparticles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science and Chemical Engineering 2023年第2期11卷 1-12页

作者： N’guadi Blaise Allou N’goran Sévérin Eroi Mougo André Tigori Patrick Atheba Albert Trokourey Laboratoire de Constitution et Réaction de la Matière UFR SSMT Université Félix Houphouët Boigny Abidjan Côte d’Ivoire Laboratoire de Thermodynamique et de Physico-Chimie du Milieu UFR SFA Université Nangui Abrogoua Abidjan Cote d’Ivoire Laboratoire des Sciences et Technologies de l’Environnement UFR Environnement Université Jean Lorougnon Guédé Daloa Côte d’Ivoire Institut National de la Recherche Scientifique (INRS-ETE) Université du Québec Quebec City Canada

In most developing countries, particularly in the countries of sub-Saharan Africa, corn cobs are considered as waste polluting the environment during the harvest period of this cereal. In order to valorize this agricultural waste, high-performance, inexpensive and low-energy consumption magnetic bioadsorbents were prepared from corn cobs. The chemically activated raw corn cob was magnetized by coating the surface with magnetite nanoparticles. The prepared biosorbents were characterized by FT-IR, XRD, FE-SEM associated with EDX, HR-TEM, TG analysis, BET surface area analysis and XPS. The maximum specific surface area of 35.22 m2/g was reached. An attempt to use of these magnetic biosorbents for the removal of heavy metal like Cr(VI) from aqueous solution was envisaged.

关键词： Green Biosorbent corn cob Magnetite Nanoparticles Surface Chemistry NaOH Activation

Recovery of NH4^＋ by corn cob produced biochars and its potential application as soil conditioner

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 2014年第6期8卷 825-834页

作者： Yang ZHANG Zifu LI Ibrahim B MAHMOOD School of Civil & Environmental Engineering University of Science and Technology Beijing Beijing 100083 China

NH4^＋ ion, a main pollutant in aquatic systems, not only causes eutrophication in rivers and lakes but also contributes to fish toxicity. In this study, an eco-friendly biosorbent was prepared from the pyrolysis of corn cob, a low-cost agricultural residue. The biochars produced by pyrolysis of corn cob at 400℃ and 600℃ were characterized and investigated as adsorbents for NH4＋ -N from an aqueous solution. The biochars were characterized through elemental analysis, Brunauer-Emmett-Teller-N2 surface area analysis, scanning electron microscopy, and Fourier transform infrared spectroscopy. Batch experiments were conducted to investigate the NH4＋ adsorption process of the corn cob biochars. The Freundlich isotherm model fitted the adsorption process better than the Langmuir and Dubinin-Radushkevich isotherm models. Moreover, the adsorption process was well described by a pseudo-second-order kinetic model. Results of thermodynamic analysis suggested that adsorption was a nonspontaneous exothermic process. Biochars produced at 400℃ had higher adsorption capacity than those produced at 600℃ because of the presence of polar functional groups with higher acidity. The exhausted biochar can be potentially used as soil conditioner, which can provide 6.37 kg NH4＋-N-t^-1 （N fertilizer per ton of biochar）.

关键词： corn cob biochar NH+ adsorption isotherm model kinetic model

Development of Silica Nanoparticle from corn cob Ash

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Nanoparticles 2016年第2期5卷 135-139页

作者： Elvis A. Okoronkwo Patrick Ehi Imoisili Smart A. Olubayode Samuel O. O. Olusunle Chemistry Department Federal University of Technology Akure Nigeria Engineering Materials Development Institute Akure Nigeria Department of Civil Engineering University of Agriculture Abeokuta Nigeria

Silica from corn cob ash (CCA) was extracted via sol-gel, and nanostructured with templating concept, these resulted in silica nanoparticle. Silica and mineral contents of CCA were determined by X-ray fluorescence (XRF). X-ray diffraction (XRD) patterns revealed amorphous nature of extracted silica. Fourier transform infrared (FTIR) data indicated the presence of siloxane and silanol groups. X-ray diffraction (XRD) of nanostrurtured silica reviled average particle size of 54 nm, Scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS) study indicates the particles to possess disorder morphology with the particle attached to each other through grain boundary to form agglomerated structure, and SEM analysis shows that particle size varies from 44 nm - 98 nm in diameter, with an average diameter of 55nm. EDS spectrum confirms SiO2.

关键词： corn cob Silica Sol-Gel Nanoparticle X-Ray Diffraction

Initial carbon release characteristics, mechanisms and denitrification performance of a novel slow release carbon source

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第8期34卷 32-45页

作者： Congyu Li Haiyan Wang Guokai Yan Weiyang Dong Zhaosheng Chu Huan Wang Yang Chang Yu Ling Yanjie Zhang State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Research Center of Environmental Pollution Control Technology Chinese Research Academy of Environmental ScienceBeijing 100012China National Engineering Laboratory for Lake Pollution Control and Ecological Restoration Chinese Research Academy of Environmental SciencesBeijing 100012China

External carbon source addition is one of the effective methods for the treatment of wastewater with low carbon to nitrogen ratio(C/N). Compared with fast-release liquid carbon sources, slow-release solid carbon sources are more suitable for the denitrification process. A novel slow-release solid carbon source(corncob-polyvinyl alcohol sodium alginatepoly-caprolactone, i.e. CPSP) was prepared using corn cob(CC) and poly-caprolactone with polyvinyl alcohol sodium alginate as hybrid scaffold. The physical properties and carbon release characteristics of CPSP and three other carbon sources were compared. CPSP had stable framework and good carbon release performance, which followed the second order release equation. The formic acid, acetic acid, propionic acid and butyric acid released from CPSP accounted for 8.27% ± 1.66 %, 56.48% ± 3.71 %, 18.46% ± 2.69% and 16.79% ± 3.02% of the total released acids respectively. The start-up period of CPSP was shorter than that of the other carbon sources in denitrification experiment, and no COD pollution was observed in the start-up phase(25–72 h) and stable phase(73–240 hr). The composition and structure of the dissolved organic compounds released by CPSP and other carbon sources were analyzed by UV-Vis absorption spectroscopy and three-dimensional fluorescence spectroscopy,which indicated that CPSP was more suitable for denitrification than the other studied carbon sources.

关键词： Novel slow-release carbon source Carbon release characteristics Denitrification Dissolved organic matter corn cob

Treatment of Agate Dyeing Wastewater Using an Immobilized Gel Mixture with Nano-Fe_(3)O_(4) Sulfate-Reducing Bacteria

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 Renewable Materials 2021年第11期9卷 2015-2032页

作者： Xuying Guo Guoliang Jiang Saiou Fu Zhiyong Hu Junzhen Di Yanrong Dong Ying Li College of Science Liaoning Technical UniversityFuxin123000China College of Construction Engineering Liaoning Technical UniversityFuxin123000China College of Mining Engineering Liaoning Technical UniversityFuxin123000China Liaoning Fourth Geological Team Limited Liability Company Fuxin123000China

To solve the problems of high Cr^(6+),Cr^(3+),SO_(4)^(2-)and H+concentrations,pollution and processing costs associated with agate dyeing industrial drainage,we prepared an immobilized gel mixture for the treatment of such drainage on the basis of microbial immobilization *** immobilized gel mixture was composed of sulfate-reducing bacteria(SRB),corn cob,and nano-Fe_(3)O_(4)(nFe_(3)O_(4)).We used a single-factor experiment to determine the optimal dose of each matrix *** analyzed the mechanism underlying the treatment of agate dyeing wastewater with an immobilized gel mixture by X-ray diffraction and scanning electron microscopy *** results of the single-factor test showed that the best treatment was obtained under the following conditions for each matrix component:SRB mass percentage of 30%,nFe_(3)O_(4) dose of 3%,and corn cob mesh size of 100 and dose of 3%.On this basis,we conducted an L9(34)orthogonal experiment to determine the optimal proportion of each matrix *** results showed that the best treatment was obtained when the gel mixture met the following conditions:SRB mass percentage of 40%,nFe_(3)O_(4) dose of 4%,and corn cob dose of 1%and mesh size of ***,the SO_(4)^(2-),Cr^(6+)and Cr^(3+)removal rates from the agate dyeing drainage were 70.54%,84.75%,and 73.80%,respectively;the total Fe and chemical oxygen demand releases were 1.086 mg·L^(-1)and 1104 mg·L^(-1),respectively;and the pH was *** gel mixture had the best treatment effect on agate dyeing wastewater under this composition ratio.

关键词： Agate dyeing drainage corn cob immobilized gel mixture nano-Fe_(3)O_(4) orthogonal test sulfate-reducing bacteria