scholarly journals Sorption of Coated and Uncoated Nanocrystalline Zinc Oxide from Aqueous Solutions onto Raw and Acetylated Cellulose Sago Hampas: Equilibrium, Kinetic and Thermodynamic Studies

2021 ◽  
Vol 411 ◽  
pp. 37-54
Author(s):  
Eric Kwabena Droepenu ◽  
Boon Siong Wee ◽  
Suk Fun Chin ◽  
Kuan Ying Kok
Keyword(s):  
Zinc Oxide ◽  
Sorption Process ◽  
Equilibration Time ◽  
Zno Nps ◽  
Thermodynamic Studies ◽  
Water And Wastewater ◽  
Physical And Chemical ◽  
Kinetic And Thermodynamic Studies ◽  
Nanocrystalline Zinc Oxide ◽  
Maximum Removal

In this study, sorption efficiency of coated (C-) and uncoated (U-) zinc oxide nanoparticles (ZnO-NPs) in aqueous solution onto raw sago hampas (RSH) and acetylated sago hampas (ACSH) was studied. Physical and chemical characteristics of both the sorbate and sorbents were analysed using various characterization techniques. The mechanism of the sorption process was evaluated using equilibrium isotherms, kinetic and thermodynamic studies. From the study, maximum percentage removal of both sorbate ions were achieved at an equilibration time of 100 minutes with an optimum sorbate mass of 2.0 g per 50 ml. The study recorded a maximum % removal of 85.1% & 87.6% for C-and U-ZnO-NPs (< 50 nm) onto RSH and 90.0% & 91.1% onto ACSH. Langmuir isotherm fitted well for the sorption process with the highest efficiency of 0.793 mg/g recorded for C-ZnO-NPs onto RSH. Pseudo-second model best described the sorption process. An exothermic and non-spontaneous sorption process was realised in all the sorption studies except that of U-ZnO-NPs (< 50 nm) onto ACSH which became spontaneous as temperature increased. Based on the findings from the multiple approaches employed, both sorbents could be proposed as viable alternatives to act as a green sorbent in the removal of ZnO-NPs from water and wastewater.

Green Route for the Fabrication of ZnO Nanoparticles and Potential Functionalization with Chitosan Using Cross-linkers: A Review

2021 ◽  
Vol 3 (1) ◽  
pp. 1-25
Author(s):  
Hemra Hamrayev ◽  
Kamyar Shameli ◽  
Mostafa Yusefi ◽  
Serdar Korpayev
Keyword(s):  
Zinc Oxide ◽  
Metal Oxide ◽  
Green Synthesis ◽  
Zno Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Synthesis Methods ◽  
Zno Nps ◽  
Biological Sources ◽  
Physical And Chemical

Zinc oxide is of significant importance for many industries due to its versatile properties, which have been enhanced with the production of this material in the nanoscale. Recent interest in the preparation of metal oxide nanoparticles using biological approaches has been reported in the literature. This technique known as “green synthesis” is an environmentally benign process than conventional methods like physical and chemical synthesis methods. Zinc oxide nanoparticles (ZnO-NPs) have been successfully obtained by green synthesis using different biological substrates like chitosan. Chitosan is biocompatible, biodegradable polymer having exclusive physical and chemical properties. Chitosan/metal oxide nanocomposite is a promising nanomaterial with enhanced properties for multiple functionalities. Therefore, this review discusses favorable approach in the formation of cross-linked Chitosan/ZnO nanocomposites attracting significant attention in various fields such biomedical due to their unique biodegradable, biocompatible, non-toxic nature. The use of biological sources, fabrication of green synthesized ZnO nanoparticles and its applications is briefly discussed. Overall, this review is a comprehensive study for the synthesis of ZnO-NPs using biological sources counting on their features and applications.

TOXICITY OF ZINC OXIDE NANOPARTICLES ON HUMAN SKIN DERMAL CELLS

2021 ◽  
Vol 9 (Spl-1- GCSGD_2020) ◽  
pp. S95-S100
Author(s):  
Harshyini Maheswaran ◽  
◽  
Ling Shing Wong ◽  
Anto Cordelia Tanislaus Antony Dhanapal ◽  
Ramasamy Thangavelu Narendhirakannan ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Human Skin ◽  
Zinc Oxide Nanoparticles ◽  
Skin Surface ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Skin Cells ◽  
Cosmetic Formulations ◽  
Dermal Cells ◽  
Physical And Chemical

Zinc oxide (ZnO) has special physical and chemical characteristics which enable it to be utilized in numerous applications including electronics, sunscreens, pigments, and most notably in biomedical applications. Nanoemulsions containing zinc oxide nanoparticles (ZnO NPs) are progressively sought-after as an active component in cosmetic formulations and are used in sunscreens, moisturizers, and antiaging products. Zinc paste bandages including Unna boot consist of open wove cotton gauze treated with ZnO paste are now common medicaments for leg ulcers. The damaged and broken skins are vulnerable to ZnO NPs uptake. This being the case, ZnO NPs on the skin surface can affect the functions of surrounding cells in numerous ways by penetrating into the skin cells. This could exert toxicity effects on the skin cells over time depending on the concentration and site of ZnO NPs exposure. This review brings together some findings regarding the toxicity of ZnO NPs on human skin dermal cells and thus in turn enlightens the safer usage of ZnO NPs in skin care applications.

Removal of cadmium(II) from aqueous solution by zinc oxide nanoparticles: kinetic and thermodynamic studies

2017 ◽  
Vol 62 ◽  
pp. 346-354 ◽  
Author(s):  
L. Khezami ◽  
Kamal K. Taha ◽  
Ezzeddinne Amami ◽  
med Ghiloufi ◽  
Lassaad El Mir
Keyword(s):  
Aqueous Solution ◽  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Thermodynamic Studies ◽  
Kinetic And Thermodynamic Studies

Sequestering of thorium ions from aqueous media on rice husk: Equilibrium, kinetic and thermodynamic studies

2015 ◽  
Vol 103 (5) ◽  
Author(s):  
Shagufta Zafar ◽  
Nasir Khalid ◽  
Muhammad Latif Mirza
Keyword(s):  
Metal Concentration ◽  
Rice Husk ◽  
Aqueous Media ◽  
Equilibration Time ◽  
Adsorption Behaviour ◽  
Batch Method ◽  
Radiotracer Technique ◽  
Thermodynamic Studies ◽  
Kinetic And Thermodynamic Studies

AbstractThe adsorption behaviour of thorium on rice husk has been studied by optimizing different parameters like nature of electrolyte, amount of adsorbent, equilibration time, metal concentration, and temperature, employing batch method and radiotracer technique. Maximum adsorption was observed at 0.0001 mol L

SEM and EDAX Study of Pretreated Rice Husk for the Sorption of Cu(II) from Wastewater

2014 ◽  
Vol 656 ◽  
pp. 17-22
Author(s):  
Upendra Kumar ◽  
Binod Kumar ◽  
Krishna Murari Pandey
Keyword(s):  
Rice Husk ◽  
Low Cost ◽  
Morphological Characteristics ◽  
Sorption Process ◽  
Sorption Kinetics ◽  
Rice Husks ◽  
Sorption Experiment ◽  
Morphological Aspects ◽  
Water And Wastewater ◽  
Physical And Chemical

The morphological characteristics as well as important physical and chemical characteristics rice husks were evaluated by different techniques to analyze the suitability of rice husk to adsorb metal ions from water and wastewater. The raw rice husk (RRH), sodium carbonate treated rice husk (NCRH) and metal adsorbed rice husk were analyzed by SEM-EDAX study. Batch sorption kinetics studies were also conducted for Cu (II) to find the corresponding equilibrium time and the percentage removal for each of the experiment in the sorption process. The results of material characteristics and morphological aspects pointed out some properties that can make the sorption processes possible. The copper removal was observed in the range of 90 to 97 % depending upon the other physicochemical parameters of the sorption experiment. The highly efficient low cost and the rapid uptake by the proposed material indicated that it could be an excellent alternative for the removal heavy metal by sorption process.

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