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Influence of fuel nature on dye adsorption efficiency of solution combustion derived zinc oxide nanoparticles: A comparative study
摘要： The present work demonstrates the use of coffee husk extract as a fuel (otherwise an agro waste) for the synthesis of nano zinc oxide (ZnO) by one step solution combustion synthesis. We also show the comparative studies of coffee husk extract (green fuel) derived nano ZnO (CHZnO) and sugar (chemical fuel) derived nano ZnO (SZnO) as an adsorbent for Congo red dye removal. The adsorption characteristics were investigated with respect to changes in pH, temperature, initial dye concentration, adsorbent dose and contact time. CHZnO exhibited higher adsorption capacity (76 mg/g) compared to SZnO (56 mg/g). The equilibrium adsorption data were analyzed using various isotherm models (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevith) and thermodynamic parameters. Among the models studied, Langmuir isotherm fitted well with experimental equilibrium data (R2>0.99). Adsorption kinetics was found to follow pseudo-second order with the highest R2 value. Intraparticle or pore diffusion was the major rate controlling step in the adsorption process. The present study demonstrates the potential application of agro-based bio-waste as a novel fuel in the synthesis of nanomaterials for use as efficient adsorbents in water treatment.
关键词： Adsorption,Intraparticle diffusion,Coffee husk extract,nano ZnO,Congo Red
更新于2025-09-23 15:23:52
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Preparation and Photocatalytic Performance of Bamboo-Charcoal-Supported Nano-ZnO Composites
摘要： Nano-ZnO/bamboo charcoal composites were prepared by precipitation with bamboo charcoal as support. Nano-ZnO/bamboo charcoal composites were characterized by XRD, SEM and EDS. Photocatalytic degradation processes of methyl orange were studied. The results indicate that the structure of nano-ZnO is of the wurtzite type and the grain size is about 19 – 54 nm. The best preparation temperature for these composites is 500 ℃. The composites have better photocatalytic degradation ability than pure ZnO under UV irradiation. Photocatalytic degradation of methyl orange with the composites obeys first-order kinetics, and the composites can be recycled.
关键词： methyl orange,precipitation,photocatalytic degradation,charcoal,Nano-ZnO
更新于2025-09-10 09:29:36
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Preparation of ZnO nanoparticle-reinforced polyamide 6 composite by <i>in situ</i> -coproduced method and their properties
摘要： Polyamide 6/ZnO nanocomposites (noted as PA6/ZnO) were prepared by an in situ co-producing method, during which Zn2(OH)2CO3 decomposed into nano-ZnO in the process of the opening-ring polymerization of caprolactam at high temperature. Transmission electron microscopy, X-ray diffraction, thermogravimetric analysis, and differential scanning calorimetry were used to analyze the size and dispersive properties of nano-ZnO, the crystallization and melting properties, the thermal properties, and crystal structure of PA6/ZnO composite, respectively. The results showed that the nano-ZnO derived from Zn2(OH)2CO3 via in situ polymerization of PA6-ZnO was uniformly dispersed in PA6 matrix. However, the overall nano-ZnO crystallization rate and crystal size in the PA6 matrix were hindered by the bulky PA6 molecular chains. The mechanical properties were evaluated using universal tensile and impact testing instruments. The results revealed that PA6/ZnO composite with 0.2% nano-ZnO content possessed excellent tensile strength, enhanced by 75% in comparison with the pure PA6. The nano-ZnO had little influence on the impact strength of PA6.
关键词： friction property,mechanical performance,nanocomposites,polyamide 6,nano-ZnO,polyamides,composite
更新于2025-09-09 09:28:46
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AIP Conference Proceedings [Author(s) PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017) - Bali, Indonesia (26–27 July 2017)] - Synthesis and photocatalytic activity of nanocomposite based on sodium alginate from brown algae with ZnO impregnation
摘要： The objective of this research is to synthesize nano sodium alginate-ZnO nanocomposite as photocatalyst to degrade methylene blue compounds. The successful synthesis of nano sodium alginate-ZnO nanocomposite was supported by the characterization of XRD (X-Ray Diffraction), FTIR (Fourier Transform Infrared), SEM (Scanning Electron Microscope) and TEM (Tunneling Electron Microscope). The first stage of the research was the synthesis of nano sodium alginate with particle size 140 nm and crystallinity index 38.78 % by XRD and TEM characterization, the obtained particle size was 146 nm x 61 nm. Nano ZnO particle size 38 nm, by XRD and TEM characterization the obtained particle size was 56.6 nm x 33.3 nm. The next stage of nanocomposite synthesis of nano sodium alginate was the impregnation with nano ZnO particle size 130 nm, by XRD and TEM characterization the particle size was 228.0 nm x 134.2 nm. The success was also supported by FTIR and SEM characterization. The final stage was the degradation of blue methylene using nano-sodium alginate-ZnO nanocomposite. The highest degradation percentage by nano sodium alginate-ZnO nanocomposite with zinc nitrate concentration of 0.075 M was 51.68% with the first order rate constant of 9.5 x10-3 /min.
关键词： methylene blue,nano ZnO,degradation,nanocomposite,nano sodium alginate
更新于2025-09-04 15:30:14