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green synthesis of Silver Nanoparticles Using Cannabis sativa Extracts and Their Anti-Bacterial Activity

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green and Sustainable Chemistry 2021年第1期11卷 38-48页

作者： Sujata Mandal Sreekar B. Marpu Roxana Hughes Mohammad A. Omary Sheldon Q. Shi Department of Mechanical Engineering University of North Texas Denton TX USA Department of Chemistry University of North Texas Denton TX USA Department of Biological Sciences University of North Texas Denton TX USA

A procedure for the green synthesis of silver nanoparticles (AgNPs) using Cannabis sativa (hemp plant) as a stabilizing media was developed and antibacterial activity was tested. Within 30 minutes of heating the mixture of silver nitrate and hemp extract, the formation of silver nanoparticles took place under the complete absence of a chemical reducing or an additional stabilizing agent. The so-formed AgNPs were characterized using different optical spectroscopy and electron microscopy techniques. The initial formation of AgNPs was established from UV-Vis data based on surface plasmon resonance (SPR) of AgNPs at ~417 nm. The exact size, shape, and elemental composition of AgNPs were established from ESEM images and EDS data. The antibacterial activity of these nanoparticles was studied on Gram-positive Staphylococcus aureus, and Gram-negative Escherichia coli following Disk diffusion and Minimum Inhibitory Concentration (MIC) tests. Results showed that the biosynthesis of silver nanoparticles using hemp extract could be

green synthesis of Poly(ethylene glycol) Modified Multi-walled Carbon Nanotubes and Their Dispersibility

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Green Synthesis of Poly(ethylene glycol) Modified Multi-wall...

green synthesis and interfacial characteristic of silver/starch core-shell structure nanocomposites

2012 China Functional Materials Technology and Industry Forum

作者： Jin-gang Yu Xin-yu Jiang Xiao-qing Chen Fei-peng Jiao Zhi-Guang Peng Dong-ming Zeng Teng-meng Yao Du-shu Huang Key Laboratory of Resources Chemistry of Nonferrous Metals Ministry of EducationCentral South University College of Chemistry and Chemical Engineering Central South University College of Science Honghe University

Poly(ethylene glycol) modified multi-walled carbon nanotubes were prepared by a green synthesis procedure,including oxidation,acyl chlorination and *** the liquid reagents were recycled by distillation or reduced pressure distillation,and complicated washing or purification was *** transform infrared spectroscopy,scanning electron microscopy and thermogravimetric analysis were used to characterize the *** results indicated that PEG was grafted to the functionalized carbon nanotubes(f-CNTs) and the mass percentage of the grafted PEG was about 12%.After sonicating f-CNTs in ethanol,the dispersibility of f-CNTs in ethanol was about 0.46 mg/*** stability of f-CNTs in ethanol was also tested by left standing a 0.4 mg/mL f-CNT/ethanol solution,no precipitation was found after 10 days.

关键词： Carbon nanotubes Poly(ethylene glycol) Functionalization green synthesis Dispersibility

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Green synthesis and interfacial characteristic of silver/sta...

Light Induced green synthesis of Silver Nanoparticles Using Aqueous Extract of Prunus amygdalus

2011中国材料研讨会

作者： Xianghua GAO 1,2,Bingshe XU 2,Liqiao WEI 1,2.1:College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024 2:Key Laboratory of Interface Science and Engineering in Advanced Materials of Taiyuan University of Technology,Ministry of Education,Taiyuan 030024

An eco-friendly methodology for the synthesis of Ag/starch nanocomposites has been reported using biodegradable starch as stabilizing *** of silver ions from AgNO 3 was carried out by glucose as reducing agents in soluble starch *** observation and interfacial characterization of Ag/starch nanocomposites were performed by using high-resolution transmission electron microscopy（HRTEM）,selected-area diffraction pattern,X-ray diffraction （XRD）and UV-vis absorption *** showed the entrapment of Ag nanoparticles inside the starch and the smooth interface formation of mostly core-shell spherical Ag/starch nanocomposites with diameter ranging from 5 to 20 *** pattern confirmed the presence of Ag nanoparticles with face-centered cubic （fcc） *** UV-vis analyses revealed that these Ag nanoparticles produced a typical emission peak at 420 *** possible interfacial interaction of the silver core and the capping agent has been investigated using infrared spectroscopy （IR）.All these measurements indicate that starch plays an important role in stabilizing interface of Ag/starch nanocomposites.

关键词： green synthesis Ag/starch nanocomposites interface..

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green and Sustainable Chemistry 2016年第1期6卷 26-33页

作者： Sista Kameswara Srikar Deen Dayal Giri Dan Bahadur Pal Pradeep Kumar Mishra Siddh Nath Upadhyay Department of Chemical Engineering & Technology Indian Institute of Technology (BHU) Varanasi Varanasi Uttar Pradesh India Tata Steel Jamshedpur Jharkhand India Department of Botany IFTM University Moradabad Uttar Pradesh India

Light driven, photon mediated green synthesis of silver nano-particles (AgNPs) was carried out using aqueous silver nitrate solution (1 mM) and aqueous extract of almond (Prunus amygdalus). Experiments were carried out in dark, diffused sunlight and direct sunlight to study the influence of light intensity as well as by wrapping the reaction tubes with colored cellophane filters (violet, green, yellow and red) to investigate the effect of light color on AgNP synthesis. It was observed that the violet filter enhanced the AgNPs synthesis appreciably. The FTIR spectroscopic analysis confirmed participation of bio-molecules with hydroxyl and amide groups present in the almond extract as reducing and capping or stabilizing agents, respectively. Dynamic light scattering (DLS) studies revealed the particle size distribution of nano-particles as 2 – 400 nm, and scanning electron microscopy (SEM) confirmed their spherical shape with an average size of about 20 nm. Growth analysis of AgNPs revealed an increase in number of nano-particles with time, whereas their rate of growth decreased gradually. The AgNP suspension was stable even beyond 3 weeks.

关键词： AgNPs Nano-Particles green synthesis Prunus amygdalus

green mediated synthesis of lanthanum doped zinc oxide:Study of its structural,optical and latent fingerprint application

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Journal of Rare Earths 2020年第12期38卷 1281-1287页

作者： H.N.Shivananjaiah K.Sailaja Kumari M.S.Geetha Government Science College Nrupatunga RoadBangalore560001India Base Educational Services BasavanagudiBangalore560004India

The present paper summarises the synthesis of La3+doped zinc oxide nanoparticles using Aloe vera gel by solution combustion method and the characterization using a powder X-ray diffractometer(PXRD),a transmission electron microscope(TEM),an X-ray photometric spectrometer(XPS),a Raman spectrometer and their applications in optical devices and latent *** pattern confirms the crystallite size of La3+doped ZnO varies from 13 to 20 *** size varies inversely with doping *** properties are found to be the maximum for 2 mol% doping *** spectra extends the use of ZnO:La3+nanoparticles in blue green *** nanoparticles also have superior property as a fluorescent labels in fingerprints.

关键词： green synthesis Nanostructures Photoluminescence Latent fingerprinting Rare earths

green Hydrothermal synthesis and Applications of Sorbus pohuashanensis/Aronia melanocarpa Extracts Functionalized-Au/Ag/AuAg Nanoparticles

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Journal of Renewable Materials 2023年第4期11卷 1807-1821页

作者： Jin Huang Jixiang Sun Kai Shao Yamei Lin Zhiguo Liu Yujie Fu Liqiang Mu College of Chemistry Chemical Engineering and Resource UtilizationKey Laboratory of Forest Plant Ecology Ministry of EducationNortheast Forestry UniversityHarbin150040China School of Forestry Northeast Forestry UniversityHarbin150040China Heilongjiang Provincial Key Laboratory of Ecological Utilization of Forestry-Based Active Substances Harbin150040China National Engineering Laboratory of Bio-Resource Eco-Utilization Harbin150040China

Nanoparticles(NPs)have already been widely used in catalysis,antibacterial and coating *** with the traditional toxic and harmful reducing reagents,green synthesis of NPs by using plant extracts is not only environmental-friendly and cost-effective but also conducive to the multi-level and efficient utilization of wild plant *** this study,the aqueous extracts from Sorbus pohuashanensis(SP)and Aronia melanocarpa(AM)fruits were used as the reducing and protective reagents for synthesizing Au/AgNPs,with the characteristics of originality operation and high *** SP/AM fruit extracts functionalized Au/AgNPs were characterized by UV-vis spectroscopy(UV-vis),transmission electron microscopy(TEM),energy dispersive spectroscopy(EDS),scanning electron microscope(SEM),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR).UV-vis spectrums showed the NPs peaks verified by the presence between 400–550 nm;TEM and SEM demonstrated NPs displayed approximately spherical structures;EDS confirmed the existence of Au/Ag elements;XRD measurements confirmed that the obtained NPs showed highly crystalline structures;FTIR demonstrated the fruits extracts were adsorbed on the surface of *** experiments indicated that SP/AM fruit extracts functionalized-NPs could be used as the reagents for removing the organic dyes efficiently;Zone of inhibition tests(ZOI)explained that NPs have slow-release antibacterial activity.

关键词： green synthesis nanoparticles Sorbus pohuashanensis Aronia melanocarpa plant extracts dye removal

green rapid synthesis of Cu_(2)O/Ag heterojunctions exerting synergistic antibiosis

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Chinese Chemical Letters 2022年第1期33卷 308-313页

作者： Feiyue Hu Bo Song Xiaohan Wang Shen Bao Siyang Shang Shupei Lv Bingbing Fan Rui Zhang Jingguo Li School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China People's Hospital of Zhengzhou University Henan Provincial People's HospitalZhengzhou 450003China School of Material Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China

Semiconductor-noble metal composite has become a research focus due to its superior performance compared with its respective *** various methods have been developed to synthesize semiconductor-noble metal heterostructures,most of them are relatively complex multistep and use toxic reactants of high cost and *** this work,a series of Cu_(2)O/Ag heterojunctions were quickly prepared in one step via simple microwave-assisted green ***,SEM,TEM,EDS,XPS,*** used to characterize obtained products,and the results indicate a Cu_(2)O/Ag metal-semiconductor heterojunction in micro-nano size was fabricated *** addition,antibacterial behavior of Cu_(2)O/Ag heterojunctions against *** and *** were *** to the synergistic effect of Cu_(2)O and Ag,the heterojunction exhibits much better antibacterial performance than the pristine Cu_(2)O *** work provides new insights into the green design and fabrication of surface-modified Cu_(2)O hybrid multifunctional materials for antibacterial applications.

关键词： Cu_(2)O/Ag heterojunctions green synthesis Microwave-assisted Antibacterial Synergistic effect

green and Efficient synthesis of 3-Pyrazolyl Indoles in Water

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Chemical Research in Chinese Universities 2020年第5期36卷 847-852页

作者： ZHAO Yanhui YU Haifeng LIAO Peiqiu WANG Wenju College qf Chemistry Baicheng Normal UniversityBaicheng 137000P.R.China Jilin Province Key Laboratory of Organic Functional Molecular Design&synthesis Faculty of ChemistryNortheast Normal UniversityChangchun 130024P.R.China

A green and efficient synthesis of 3-pyrazolyl indoles was developed by the eye 1 ocondensation reactionof β-ethylthio-β-indolyl-α,β-unsaturated ketones with semi carbazide hydrochloride as hydrazine equivalent in thepresence of 3 equiv. of PEG400(la/PEG mole ratio of 1:3) in reflux water. This procedure did not require toxichydrazine and product purification, eliminating the use of toxic liquid chemicals.

关键词： 3-Pyrazolyl indole green synthesis Semicarbazide hydrochloride Polyethylene glycol Hydrazine equivalent

Ascorbic Acid Assisted green Route for synthesis of Water Dispersible Carbon Dots

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Chemical Research in Chinese Universities 2013年第3期29卷 401-403页

作者： NAWAZ Faisal WANG Liang ZHU Long-feng MENG Xiang-ju XIAO Feng-Shou State Key Laboratory of Inorganic synthesis and Preparative Chemistry Jilin University Changehun 130012 P. R. China Department of Chemistry Zhejiang University Hangzhou 310028 P. R. China

Conventional quantum dots inherently carry the risk of cytotoxicity. Considering the biomedical limitations, an amino acid and vitamin were utilized to prepare highly luminescent carbon dots. Ascorbic acid and lysine were used to synthesize water soluble carbon dots which are highly hiocompatible as both reactants and essential nutrients.

关键词： Carbon dot Ascorbic acid Hydrothermal synthesis Lysine green synthesis Water dispersible