scholarly journals Engineered Magnetic Carbon-Based Adsorbents for the Removal of Water Priority Pollutants: An Overview

2021 ◽  
Vol 2021 ◽  
pp. 1-41
Author(s):  
H. E. Reynel-Ávila ◽  
K. I. Camacho-Aguilar ◽  
A. Bonilla-Petriciolet ◽  
D. I. Mendoza-Castillo ◽  
H. A. González-Ponce ◽  
...  
Keyword(s):  
Low Cost ◽  
Physicochemical Characterization ◽  
Multicomponent Adsorption ◽  
Preparation Methods ◽  
Water Pollutants ◽  
Adsorption Mechanisms ◽  
Magnetic Adsorbents ◽  
Adsorption Of Water ◽  
Carbon Based

This review covers the preparation, characterization, and application of magnetic adsorbents obtained from carbon-based sources and their application in the adsorption of both inorganic and organic pollutants from water. Different preparation routes to obtain magnetic adsorbents from activated carbon, biochar, hydrochar, graphene, carbon dots, carbon nanotubes, and carbon nanocages, including the magnetic phase incorporated on the solid surface, are described and discussed. The performance of these adsorbents is analyzed for the removal of fluoride, arsenic, heavy metals, dyes, pesticides, pharmaceuticals, and other emerging and relevant water pollutants. Properties of these adsorbents and the corresponding adsorption mechanisms have been included in this review. Overall, this type of magnetic adsorbents offers an alternative for facing the operational problems associated to adsorption process in water treatment. However, some gaps have been identified in the proper physicochemical characterization of these adsorbents, the development of green and low-cost preparation methods for their industrial production and commercialization, the regeneration and final disposal of spent adsorbents, and their application in the multicomponent adsorption of water pollutants.

scholarly journals Silver Nanoparticles on Chitosan/Silica Nanofibers: Characterization and Antibacterial Activity

2019 ◽  
Vol 21 (1) ◽  
pp. 166 ◽  
Author(s):  
Małgorzata Zienkiewicz-Strzałka ◽  
Anna Deryło-Marczewska ◽  
Yury A. Skorik ◽  
Valentina A. Petrova ◽  
Adam Choma ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Low Cost ◽  
Physicochemical Characterization ◽  
Analytical Techniques ◽  
Electrospinning Technique ◽  
X Ray ◽  
Silica Phase ◽  
Silica Nanofibers

A simple, low-cost, and reproducible method for creating materials with even silver nanoparticles (AgNP) dispersion was established. Chitosan nanofibers with silica phase (CS/silica) were synthesized by an electrospinning technique to obtain highly porous 3D nanofiber scaffolds. Silver nanoparticles in the form of a well-dispersed metallic phase were synthesized in an external preparation step and embedded in the CS/silica nanofibers by deposition for obtaining chitosan nanofibers with silica phase decorated by silver nanoparticles (Ag/CS/silica). The antibacterial activity of investigated materials was tested using Gram-positive and Gram-negative bacteria. The results were compared with the properties of the nanocomposite without silver nanoparticles and a colloidal solution of AgNP. The minimum inhibitory concentration (MIC) of obtained AgNP against Staphylococcus aureus (S. aureus) ATCC25923 and Escherichia coli (E. coli) ATCC25922 was determined. The physicochemical characterization of Ag/CS/silica nanofibers using various analytical techniques, as well as the applicability of these techniques in the characterization of this type of nanocomposite, is presented. The resulting Ag/CS/silica nanocomposites (Ag/CS/silica nanofibers) were characterized by small angle X-ray scattering (SAXS), X-ray diffraction (XRD), and atomic force microscopy (AFM). The morphology of the AgNP in solution, both initial and extracted from composite, the properties of composites, the size, and crystallinity of the nanoparticles, and the characteristics of the chitosan fibers were determined by electron microscopy (SEM and TEM).

New Preparation Method and Characterization of Nanosilver

2014 ◽  
Vol 809-810 ◽  
pp. 82-87
Author(s):  
Xin Liu ◽  
Chang Ping Wei ◽  
Li Dan Dong ◽  
Sheng Nan Zhao ◽  
Jing Li ◽  
...  
Keyword(s):  
Chemical Method ◽  
Reduction Method ◽  
Preparation Method ◽  
Low Cost ◽  
Environmental Pollutants ◽  
Physical Method ◽  
Environment Protection ◽  
Preparation Methods ◽  
Microbial Enzyme

There are many kinds of preparation methods of silver nanoparticles ,such as chemical method, physical method plant reduction method and microbial enzyme and so on. The most common method is to use chemical method for reduction. But this method needs to add some chemicals that will produce environmental pollutants. The production consumption will be increased. High quality nanometer silver needing low cost and according with environment protection needs was prepared by using homogeneous precipitation that contains no auxiliary reagent and high temperature pyrolysis in this paper. Experimental results that this method is very effective.

scholarly journals Physicochemical characterization of Moringa oleífera’s shells as biosorbent for pharmaceuticals biosorption

2020 ◽  
pp. 99-103
Author(s):  
A De Olivera ◽  
C Kreutz ◽  
R Martins
Keyword(s):  
Emerging Contaminants ◽  
Wastewater Treatment Plants ◽  
Low Cost ◽  
Physicochemical Characterization ◽  
Environmental Issues ◽  
Global Scale ◽  
New Methods ◽  
Biosorption Process ◽  
Inflammatory Drugs

The pharmaceuticals as emerging contaminants have become one of the most controversial environmental issues at global scale. Over the years, the presence of antibiotics and anti-inflammatory drugs inside rivers, lakes, and even inside drinking water streams has increased. The wastewater treatment plants (WWTPs) lack the necessary technology to remove concentrations between the range ng/l-mg/l and therefore, the need to develop new methods able to remove contaminants in an effective, low cost and environmental friendly way arises. The present work is focused on studying the potential adsorption capacity of Moringa oleífera (MO) to remove Diclofenac (DCF) and Oxytetracycline (OTC) from wastewater. Through different experiences, it was possible to characterizes the main functional groups of MO and determine the principal responsible of the biosorption process.

A Research on Synthesis of Microorganism Template Nano-Selenium Material

2013 ◽  
Vol 443 ◽  
pp. 639-642
Author(s):  
Ya Li Zhang ◽  
Wei Xia ◽  
Ai Hua Ren
Keyword(s):  
Low Cost ◽  
Synthetic Methods ◽  
X Ray Diffraction ◽  
Environmental Friendliness ◽  
Preparation Methods ◽  
X Ray ◽  
E Coli ◽  
Physical Chemical ◽  
Harsh Conditions

At present there are various kinds of synthetic methods of nanomaterials including physical, chemical and composite method derived from the former two kinds. However, these preparation methods require harsh conditions and produce low yield. Besides, they cause environmental pollution easily. Therefore the microorganism template synthesis is favored highly due to its rich resources, low cost and availability, environmental friendliness and unique configuration and high morphology repeatability. In this thesis E. coli strains are successfully adopted as the template to synthesize nanoselenium material. Such inspection methods as scanning electron microscope, X-ray diffraction and ultraviolet are used for the characterization of samples. It aims to explore a new synthetic green way for nanoselenium material.

Introducing Electrospray as a Potent Technique to Deliver Chitosan/pDNA Nanoparticles to Eukaryotic Cells

2021 ◽  
Vol 66 ◽  
pp. 73-84
Author(s):  
Farzaneh Saeedi Landi ◽  
Babak Negahdari ◽  
Fariba Esmaeili ◽  
Sedigheh Kolivand ◽  
Amir Amani
Keyword(s):  
Zeta Potential ◽  
Transfection Efficiency ◽  
Low Cost ◽  
Gene Transfection ◽  
Physicochemical Characterization ◽  
Entrapment Efficiency ◽  
Ratio Size ◽  
Agarose Electrophoresis ◽  
One Step

Electrospray technique has received increasing attentions for intracellular gene delivery as well as production of nanoparticles. In this study, chitosan/pDNA nanoparticles with N/P ratio of 5 were prepared and transferred to HEK293T cells by electrospray technique. Physicochemical characterization of prepared nanoparticles, including size, zeta potential and entrapment efficiency was performed and attachment of pDNA to chitosan was confirmed by gel agarose electrophoresis. Moreover, transfection efficiency was investigated using flow cytometry. MTT assay was performed for cell viability studies. Nanoparticles were prepared at three pDNA concentrations of 10, 55 and 100 μg/ml in fixed N/P ratio. Size of nanoparticles was obtained as 110, 188 and 240 nm, using DLS. SEM showed size of 102.34 ± 10.66 nm for samples having 55 μg/ml pDNA. Zeta potential and entrapment efficiency were +25 mv and 85±4%m respectively. The effect of pDNA concentration, electrospray time and incubation time on transfection efficiency was investigated using Box-Behnken design. Percent of GFP-positive cells was 41.05 ± 3.04% which was taken as an indicator of transfection efficiency. Transfection efficiency of this method was then compared with that of calcium phosphate (31.1 ± 2.4%), showing improved efficiency. Considering the fact that electrospray is an easy, low cost, one-step process which makes low damage to cells and produces monodispersed nanoparticles, the method is introduced as a fascinating approach in gene transfection.

Optimization and Physicochemical Characterization of Chitosan and Chitosan Nanoparticles Extracted from the Crayfish Procambarus clarkii Wastes

2019 ◽  
Vol 38 (2) ◽  
pp. 385 ◽  
Author(s):  
Marwa M. El-Naggar ◽  
Wael S. I. Abou-Elmagd ◽  
Ashraf Suloma ◽  
Hamza A. El-Shabaka ◽  
Magdy T. Khalil ◽  
...  
Keyword(s):  
Procambarus Clarkii ◽  
Chitosan Nanoparticles ◽  
Physicochemical Characterization
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