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A review of chemical absorption of carbon dioxide for biogas upgrading

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Chinese Journal of Chemical engineering 2016年第6期24卷 693-702页

作者： Fouad R.H. Abdeen Maizirwan Mel Mohammed Saedi Jami Sany Izan Ihsan Ahmad Faris Ismail department of biotechnology engineering International Islamic University Malaysia Kuala Lumpur 50728 Malaysia department of Mechanical engineering International Islamic University Malaysia Kuala Lumpur 50728 Malaysia

Significant attention has been given to biogas production, purification and upgrading as a renewable and clean fuel supplement. Biogas is a product of an anaerobic digestion process comprising methane, carbon dioxide,and trace amounts of other gases. Biogas purification removes trace gases in biogas for safe utilisation. Biogas upgrading produces methane-rich biogas by removing bulk carbon dioxide from the gas mixture. Several carbon dioxide removal techniques can be applied for biogas upgrading. However, chemical absorption of carbon dioxide for biogas upgrading is of special significance due to its operation at ambient or near ambient temperature and pressure, thus reducing energy consumption. This paper reviews the chemical absorption of carbon dioxide using amine scrubbing, caustic solvent scrubbing, and amino acid salt solution scrubbing. Each of these techniques for biogas upgrading is discussed. The paper concludes that an optimised implementation of the chemical absorption techniques for biogas upgrading requires further research.

关键词： Biogas upgrading BiofuelCO2 captureAbsorptionAmine scrubbingCaustic scrubbing

Agrobacterium-Mediated Transformation of Rice: Constraints and Possible Solutions

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Rice science 2019年第3期26卷 133-146页

作者： Sulaiman MOHAMMED Azman Abd SAMAD Zaidah RAHMAT department of biotechnology and Medical engineering Faculty of Biosciences and Medical Engineering Universiti Teknologi Malaysia department of Biological Sciences Faculty of Science Gombe State University

Genetic transformation of rice(Oryza sativa L.) by introducing beneficial traits is now a central research instrument in plant physiology and a practical tool for plant improvement. Many approaches are verified for stable introduction of foreign genes into the plant genome. The review examined the different constraints that limit the success of rice genetic transformation via Agrobacterium-mediated approach and suggested possible solutions. Explant identification, gene transfer technique and construct to tailor the integration, transgene expression without collateral to genetic damage and transformant selection are among the technical challenges affecting the rice transformation. Despite the contests, Agrobacteriummediated transformation system has been a better option for producing transgenic rice varieties because of its exact T-DNA processing and simple integration of low copy-number transgene. This information is necessary for improving the transformation system for recalcitrant rice varieties.

关键词： rice Agrobacterium-mediated transformation tissue culture gene transfer T-DNA integration

Li-rich layered oxides:Structure,capacity and voltage fading mechanisms and solving strategies

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Particuology 2022年第2期20卷 1-10页

作者： Yin Xie Yongcheng Jin Lan Xiang department of Chemical engineering Tsinghua UniversityBeijing 100084China School of Materials Science and engineering Ocean University of ChinaQingdao 266100China Qingdao Institute of Bioenergy and bioprocess Technology Chinese Academy of SciencesQingdao 266101China

Lithium rich layered oxides(LLOs)are attractive cathode materials for Li-ion batteries owing to their high capacity(>250 mA h g^(-1))and suitable voltage(∼3.6 V).However,they suffer from serious voltage and capacity fading,which is focused in this ***,an overview of crystal structure,band structure and electrochemical performances of LLOs is *** that,current understanding on oxygen loss,capacity fading and voltage fading is ***,five strategies to mitigate capacity and voltage fading are *** is believed that these understandings can help solve the fading problems of LLOs.

关键词： Lithium rich layered oxides Redox mechanisms Capacity fading Voltage fading Solving strategies Introduction

Biomedical Perspective of Electrochemical Nanobiosensor

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Nano-Micro Letters 2016年第3期8卷 193-203页

作者： Priti Singh Shailendra Kumar Pandey Jyoti Singh Sameer Srivastava Sadhana Sachan Sunil Kumar Singh department of biotechnology Motilal Nehru National Institute of Technology department of Chemical engineering Motilal Nehru National Institute of Technology

Electrochemical biosensor holds great promise in the biomedical area due to its enhanced specificity, sensitivity, label-free nature and cost effectiveness for rapid point-of-care detection of diseases at bedside. In this review, we are focusing on the working principle of electrochemical biosensor and how it can be employed in detecting biomarkers of fatal diseases like cancer, AIDS, hepatitis and cardiovascular diseases. Recent advances in the development of implantable biosensors and exploration of nanomaterials in fabrication of electrodes with increasing the sensitivity of biosensor for quick and easy detection of biomolecules have been elucidated in detail. Electrochemical-based detection of heavy metal ions which cause harmful effect on human health has been discussed. Key challenges associated with the electrochemical sensor and its future perspectives are also addressed.

关键词： Biomarkers Point-of-care detection Nanomaterials Electroactive species Potentiometric Amperometric Implantable

Naringenin suppresses NLRP3 inflammasome activation via the mRNA-208a signaling pathway in isoproterenol-induced myocardial infarction

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Asian Pacific Journal of Tropical Biomedicine 2023年第10期13卷 443-450页

作者： Ayman Eldourghamy Toka Hossam Mohammed Abdalla Hussein Amal Abdel-Aziz Samir A.El-masry Environmental biotechnology department Genetic Engineering and Biotechnology Research InstituteSadat UniversityEgypt department of Medical Labs Faculty of Applied Medical Sciences TechnologyOctober 6 UniversityEgypt department of biotechnology Faculty of Applied Health Sciences TechnologyOctober 6 UniversityEgypt Molecular Biology department Genetic Engineering and Biotechnology Research InstituteSadat UniversityEgypt

Objective:To investigate the cardioprotective effect of naringenin against isoproterenol(ISO)-induced cardiotoxicity in ***:Rats were divided into five groups:the normal group,the ISO group(85 mg/kg b.w.);the ISO+naringenin(50 mg/kg b.w.)group,the ISO+naringenin(100 mg/kg b.w.)group and the ISO+propranolol(10 mg/kg b.w.)*** creatine kinase-MB(CK-MB),cardiac troponin T,lactate dehydrogenase,brain natriuretic peptide(BNP),and IL-10,as well as cardiac transforming growth factor-β1(TGF-β1),vascular endothelial growth factor(VEGF)and malondialdehyde(MDA)were *** addition,NLRP3 and mRNA-208a expressions were evaluated by RT-PCR *** examination was also performed to assess cardiac ***:Naringenin treatment significantly decreased plasma lactate dehydrogenase,CK-MB,cardiac troponin T,BNP,and IL-10,as well as cardiac TGF-β1,VEGF,and MDA while increasing p-Akt and superoxide dismutase in ISO-administered *** also reduced NLRP3 and mRNA-208a gene expression ***,naringenin improved ISO-induced cardiac ***:Naringenin attenuates myocardial dysfunction in ISO-treated rats by decreasing oxidative stress and increasing cardiac endogenous antioxidant system,which may be modulated partly by improvement of NLRP3 and mRNA-208a gene expression.

关键词： Naringenin Isoproterenol Myocardial infarction Antioxidants NLRP3 mRNA-208a

Kinetics of chemical leaching of chalcopyrite from low grade copper ore: behavior of different size fractions

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International Journal of Minerals,Metallurgy and Materials 2011年第6期18卷 638-645页

作者： H. Naderi M. Abdollahy N. Mostoufi M.J. Koleini S.A. Shojaosadati Z. Manafi Mining engineering department Faculty of Engineering Tarbiat Modares University School of Chemical engineering College of Engineering University of Tehran biotechnology Group Chemical Engineering Department Faculty of Engineering Tarbiat Modares University Research & Development Division Sarcheshmeh Copper Complex Kerman *** Iran

The kinetics of the chemical leaching of copper from low grade ore in ferric sulfate media was investigated using the constrained least square optimization technique. The experiments were carried out for different particle sizes in both the reactor and column at constant oxidation-reduction potential （Eh）, pH values, and temperature. The main copper mineral was chalcopyrite. About 40% of Cu recovery is obtained after 7 d of reactor leaching at 85℃ using -0.5 mm size fraction, while the same recovery is obtained at 75℃ after 24 d. Also, about 23% of Cu recovery is obtained after 60 d of column leaching for ＋4--8 mm size fraction whereas the Cu recovery is as low as about 15% for ＋8--12.7 and ＋12.7--25 mm size fractions. A 4-stage model for chalcopyrite dissolution was used to explain the observed dissolution behaviors. The results show that thick over-layers of sulphur components cause the parabolic behavior of chalcopyrite dissolution and the precipitation of Fe3＋ plays the main role in chalcopyrite passivation. In the case of coarse particles, transformation from one stage to another takes a longer time, thus only two stages including the initial reaction on fresh surfaces and S0 deposition are observed.

关键词： chalcopyrite leaching kinetics copper ore treatment particle size

Organic micro-pollutant removal in liquid-phase using carbonized silk cotton hull

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Journal of Environmental Sciences 2008年第9期20卷 1046-1054页

作者： M Sathishkumar A R Binupriya D Kavitha R Selvakumar K K Sheema J G Choi department of Food Science and Technology Institute of Agricultural Science and Technology Chonbuk National University department of Chemical engineering Yonsei University department of biotechnology Bharathiar University department of Plant biology and biotechnology Government Arts College National Agricultural Products Quality Management Services

Phenolic compounds constitute one of the major pollutants in the modern world. Although many physical and chemical treatment technologies for their removal exist, most of them are economically not feasible. The present study was aimed at using silk cotton hull, a potent agricultural waste as an adsobent for removal of 2,4-dichlorophenol (2,4-DCP), which was used as a model phenolic compound. The process parameters were investigated and optimized conditions were determined. The equilibrium time was found to ...

关键词： silk cotton hull carbon adsorption 2 4-DCP temperature kinetic study

Synthesis of magnetically modified palygorskite composite for immobilization of Candida sp. 99–125 lipase via adsorption

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Chinese Journal of Chemical engineering 2015年第5期23卷 822-826页

作者： Ya Li Jicheng Hu Pingfang Han College of biotechnology and Pharmaceutical engineering Nanjing Tech University department of Environment and Resource Nantong Science and Technology College

Magnetically modified palygorskite composites were synthesized with γ-Fe2O3 dispersing on the external surface of clay mineral. The magnetic clay was characterized with Fourier transform infrared, X-ray diffrac- tion, transmission electron microscopy, and vibrating sample magnetometer. Candida sp. 99-125 lipase was immobilized on magnetic palygorskite composites by physical adsorption with enzyme loading of 41.5 mg· g^-1 support and enzyme activity of 2631.6 U· （g support）^-1. The immobilized lipase exhibit better thermal and broader pH stability and excellent reusabilitV compared with free lipase.

关键词： Magnetically modified palygorskite Immobilized lipase Adsorption Stability Reusability

Studies on the Adsorption of Amino Methylene Phosphonic Acid Resin for Holmium(Ⅲ)

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Journal of Rare Earths 2003年第6期21卷 613-617页

作者：吴香梅熊春华姚彩萍 department of Chemistry Lishui Teachers College College of Food Science Biotechnology and Environmental Engineering Hangzhou University of Commerce

The adsorption behavior and mechanism of a novel chelate resin, amino methylene phosphonic acid resin (APAR) for Ho(Ⅲ) were investigated. The statically saturated adsorption capacity is 258 mg·g^(-1) resin at 298 K in HAc-NaAc medium. The Ho(Ⅲ) adsorbed on APAR can be repeatedly eluted by 3.0 mol·L^(-1) HCl and the elution percentage is as high as 95.8%. The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k_(298)=1.14×10^(-5) s^(-1). The adsorption behavior of APAR for Ho(Ⅲ) obeys the Freundlich isotherm. The thermodynamic adsorption parameter, enthalpy change ΔH of APAR for Ho(Ⅲ) is 11.4 kJ·mol^(-1). The apparent activation energy is E_a=15.8 kJ·mol^(-1). The molar coordination ratio of the functional group of APAR to Ho(Ⅲ) is about 2∶1. The adsorption mechanism of APAR for Ho(Ⅲ) was examined by using chemical method and IR spectrometry.

关键词： matallurgical technology amino methylene phosphonic acid resin Ho adsorption mechanism rare earths