Nanoscale Iron-Manganese Binary Oxide for As(III) Removal in Synthesized Groundwater

2013 ◽  
Vol 319 ◽  
pp. 209-212 ◽  
Author(s):  
Shu Qiong Kong ◽  
Yan Xin Wang ◽  
Cheng Wang ◽  
Li Ling Jin ◽  
Ming Liang Liu ◽  
...  
Keyword(s):  
Cost Effective ◽  
Precipitation Method ◽  
Experiment Data ◽  
Binary Oxides ◽  
Initial Stage ◽  
Pseudo Second Order ◽  
Co Precipitation ◽  
Iron Manganese ◽  
High Arsenic ◽  
High Arsenic Groundwater

Cost-effective technologies to remove arsenic from high arsenic groundwater are urgently needed for safe water supply in many countries. In this study, a new sorbent of nanoscale iron-manganese binary oxides (NIM) was prepared by an improved co-precipitation method. The as-synthesized adsorbent is amorphous with 280 m2/g surface area and particle size of 10-20nm. For the adsorption of 2 mg/L As(III), the aqueous concentration quickly decreases to less than 10 μg/L within 30 min. During the adsorption of As(III), low concentration of As(V) is measured in aqueous solution in the initial stage and disappeared afterwards, whereas the fraction of As(V) on NIM surface gradually proving the oxidative transformation of As(III) to As(V). Its batch experiment data followed pseudo-second-order kinetics.

Adsorptive removal of PPCPs by biomorphic HAP templated from cotton

2016 ◽  
Vol 74 (1) ◽  
pp. 276-286 ◽  
Author(s):  
Bin Huang ◽  
Dan Xiong ◽  
Tingting Zhao ◽  
Huan He ◽  
Xuejun Pan
Keyword(s):  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Precipitation Method ◽  
Adsorptive Removal ◽  
Transmission Electron ◽  
Initial Ph ◽  
Pseudo Second Order ◽  
Co Precipitation

Biomorphic nano-hydroxyapatite (HAP) was fabricated by a co-precipitation method using cotton as bio-templates and employed in adsorptive removal of ofloxacin (OFL) and triclosan (TCS) that are two representative pharmaceuticals and personal care products (PPCPs). The surface area and porosity, crystal phase, functional group, morphology and micro-structure of the synthesized HAP were characterized by Brunauer–Emmett–Teller isotherm, X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron macroscopic and transmission electron microscopy. The effects of initial pH, ionic strength, initial concentration, contact time and temperature on the removal of PPCPs were studied in a batch experiment. The adsorption of OFL and TCS was rapid and almost accomplished within 50 min. Kinetic studies indicated that the adsorption process of OFL and TCS followed the pseudo-first-order and pseudo-second-order models, respectively. The Freundlich isotherm described the OFL adsorption process well but the adsorption of TCS fitted the Langmuir isotherm better. Thermodynamics and isotherm parameters suggested that both OFL and TCS adsorption were feasible and spontaneous. Hydrogen bond and Lewis acid–base reaction may be the dominating adsorption mechanism of OFL and TCS, respectively. Compared to other adsorbents, biomorphic HAP is environmentally friendly and has the advantages of high adsorption capacity, exhibiting potential application for PPCPs removal.

scholarly journals Preparation and Properties of Floral CaO/ZnO Nanocomposite From Achatina Fulica Snail Shell

2021 ◽  
Author(s):  
Qiushi Jiang ◽  
Zhaolian Han ◽  
Yafeng Yuan ◽  
Zhiqiang Cheng
Keyword(s):  
Visible Light ◽  
Cost Effective ◽  
Raw Material ◽  
Precipitation Method ◽  
Potential Candidate ◽  
Achatina Fulica ◽  
Vis Spectroscopy ◽  
Sem Study ◽  
Co Precipitation ◽  
Visible Light Degradation

Abstract In this study, CaO prepared by calcination treatment from abandoned Achatina fulica shell was used as a raw material, and the nano-flower-like CaO/ZnO photocatalytic composite material was prepared through co-precipitation method. SEM study showed ZnO with spindle-like petals in the range of 500-1000 nm grown on the surface of CaO carrier. The mapping image shows that the base component of the nanometer flower is mainly CaO, which is because CaO is not only in the reaction as a carrier, but also creates an alkaline environment in the methanol system, which is advantageous for co-precipitation. UV-vis spectroscopy shows that the visible light absorption of composites has red shifts, besides, PL, EIS and photocurrent test showed that the composites have stronger electronic hole separation capabilities. The visible light degradation test of rhodamine B showed that CaO/ZnO photocatalytic composite could degrade 90% of the pollutants in 25 min, superior to CaO and ZnO, exhibiting recyclability properties, which is a potential candidate with cost-effective and sustainable photocatalysts.

A Study of the Thermal Properties of Nano-crystalline Binary Oxides Prepared by Co-precipitation Method

2020 ◽  
Vol 70 (2) ◽  
pp. 108-113
Author(s):  
Tahira Amer Bashir ZIYA ◽  
Muhammad Naeem ASHIQ ◽  
Jae-Hyeon KO* ◽  
Farooq BASHIR ◽  
Ghulam SHABBIR
Keyword(s):  
Thermal Properties ◽  
Precipitation Method ◽  
Binary Oxides ◽  
Nano Crystalline ◽  
Co Precipitation

Antibody conjugated magnetic nanoparticle based colorimetric assay for the detection and quantification of aflatoxin B1 in wheat grains

2021 ◽  
pp. 1-16
Author(s):  
R. Kumari ◽  
H. Jaiswal ◽  
T. Chowdhury ◽  
A.K. Ghosh
Keyword(s):  
Safety Concern ◽  
Colorimetric Assay ◽  
Protein A ◽  
Cost Effective ◽  
Precipitation Method ◽  
Coumaric Acid ◽  
Wheat Grains ◽  
Vis Spectroscopy ◽  
Co Precipitation ◽  
Aflatoxin B

Aflatoxin B1 (AFB1) is a most potent carcinogenic secondary metabolite produced by Aspergillus flavus. As a food safety concern, development of a rapid, cost effective, sensitive and easy to use method for the detection of aflatoxin is of prime requirement. In this study, AFB1 was conjugated with bovine serum albumin (BSA), and AFB1-BSA conjugate was purified by HPLC. Purification was confirmed by UV-Vis spectroscopy, FTIR and MALDI-TOF mass spectrometry. The polyclonal antibody was raised against AFB1-BSA conjugate in rabbit and purified by protein A sepharose and BSA sepharose affinity columns. Iron oxide nanoparticles (MNPs) were synthesised by co-precipitation method and their surface was functionalised with (3-aminopropyl) triethoxysilane (APTES). Size of APTES conjugated MNPs was determined by electron microscopy, and characterised by several biophysical techniques. The purified anti-AFB1 antibody was conjugated with surface functionalised MNPs and the conjugation was confirmed by determining the sizes of free and antibody conjugated MNPs by field emission scanning electron microscope where increase of particle sizes from 10-20 to 40-50 nm was observed due to antibody conjugation. Anti-AFB1 antibody conjugated MNPs were used for capturing AFB1 from the aflatoxin spiked wheat grains with a recovery percentage of more than 80% and used effectively five times. The captured AFB1 was then quantified by a sensitive colorimetric assay where colourless AFB1 was first converted into coumaric acid by NaOH. Subsequently, coumaric acid reacted with 2,6-dibromoquinone-4-chloroimide (DBQC) to a green-coloured indophenol product which was quantified spectrophotometrically. AFB1 contamination as low as 2 μg/kg in wheat grains was detected by the developed technique suggesting its potential application for both qualitative and quantitative analysis of aflatoxins present in feed and food materials.

scholarly journals Adsorption of As(V) and As(III) from aqueous solution by lepidocrocite (γ-FeOOH) nanoparticle

2016 ◽  
Vol 19 (4) ◽  
pp. 270-281
Author(s):  
Trung Dinh Nguyen ◽  
Phuong Dong Truong
Keyword(s):  
Adsorption Equilibrium ◽  
Reaction Model ◽  
Precipitation Method ◽  
Second Order Reaction ◽  
High Adsorption ◽  
Freundlich Isotherms ◽  
Adsorption Capacities ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Co Precipitation

γ-FeOOH nanorods an adsorbent for As(V) and As(III) removal was prepared by a chemical co-precipitation method. The maximum adsorption capacities at pH6 for As(V) and As(III) were 63.75 and 88.99 mg/g, respectively, higher than those of Fe2O3, Fe3O4... The adsorption data accorded with Freundlich isotherms. At the study pH, for arsen, the adsorption equilibrium was gained after 90 min. Kinetic data fitted well to the pseudo-second-order reaction model. The adsorption of γ-FeOOH for As (V) and As(III) could be competed by some other ion such as sulfate, ammonium and chloride. The high adsorption capability and good performance on other aspects make the γ-FeOOH nanorod a promissing adsorbent for the removal of As (V) and As(III) from the groundwater.

scholarly journals Acalypha indica and Curcuma longa plant extracts mediated ZnS nanoparticles

2019 ◽  
Vol 16 (2) ◽  
pp. 174-182
Author(s):  
M. Sathish Kumar ◽  
M. Saroja ◽  
M. Venkatachalam
Keyword(s):  
Plant Extract ◽  
Curcuma Longa ◽  
Cost Effective ◽  
Inhibition Zone ◽  
Precipitation Method ◽  
Diffusion Method ◽  
Zns Nanoparticles ◽  
Co Precipitation ◽  
Acalypha Indica

The development of biomedical electronics, biosynthesis of ZnS nanoparticles(NPs) much attracted researchers, due to an eco-friendly and cost-effective routes forsynthesisZnSnanoparticles. In this present work, ZnS NPswas synthesized by using acalypha indica and curcuma longa plant extract using chemical co-precipitation method. The structural, morphological, element composition of biosynthesisZnS NPs was characterized by XRD, SEM and EDAX respectively. Optical and photoluminescence (PL) properties were evaluated by UV Visible spectroscopy. The formation of inhibition zone diameter against human pathogenic microorganisms was screened by in vitro disc diffusion method. From this investigation formation of inhibition zones clearly shows biosynthesizedZnS NPs have high antimicrobial activity against tested organisms, especially curcuma longa plant extract mediated ZnS NPs was formed maximum inhibition against all the tested microorganism.

scholarly journals Fabrication And Characterization of Biomagnetic Composite Material

2019 ◽  
Vol 2 (3) ◽  
pp. 1233-1237
Author(s):  
Yekbun Avşar Teymur ◽  
Fuat Güzel ◽  
Gülbahar Akkaya Sayğılı
Keyword(s):  
Magnetic Material ◽  
Composite Material ◽  
Low Cost ◽  
Cost Effective ◽  
Precipitation Method ◽  
Cost Effective Method ◽  
Tomato Processing ◽  
Nanoparticles Characterization ◽  
Co Precipitation

In this study, the synthesis and characterization of a biomagnetic composite material was achieved by a simple and cost effective method. Tomato processing waste was successfully converted into a magnetic material via embedding Fe3O4 nanoparticles to its structure. Due to its low cost and ease of application, co-precipitation method was used for loading the magnetite nanoparticles. Characterization studies were carried out with Fourier transform infrared spectroscopy, scanning electron microscopy and vibrating sample magnetometer spectroscopy and the outcomes of the analyses of non-magnetic and magnetic material were compared.

scholarly journals Adsorption of [AuCl4]– on Ultrasonically and Mechanical-Stirring Assisted Mg/Al-NO3 Hydrotalcite-Magnetite

2018 ◽  
Vol 16 (3) ◽  
pp. 268 ◽  
Author(s):  
Triastuti Sulistyaningsih ◽  
Sri Juari Santosa ◽  
Dwi Siswanta ◽  
Bambang Rusdiarso
Keyword(s):  
Adsorption Capacity ◽  
Precipitation Method ◽  
Order Kinetic ◽  
Weakly Bound ◽  
Ph Optimum ◽  
Mechanical Stirring ◽  
Naoh Solution ◽  
Radiation Technique ◽  
Pseudo Second Order ◽  
Co Precipitation

It has been examined the application of Mg/Al-NO3 hydrotalcite-magnetite synthesized mechanically (MHT) and ultrasonically (UMHT) by co-precipitation method as adsorbents for [AuCl4]– from aqueous solution. Two techniques of synthesis were conducted to determine the effect on the increase of adsorption ability of the [AuCl4]–. Magnetite and Mg/Al-NO3 hydrotalcite-magnetite synthesized by co-precipitation with modifications hydrothermal treatment at 120 °C for 5 h. The adsorbents were characterized by Fourier Transform Infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and Vibrating sample magnetometer (VSM). Adsorption studies were done by getting the optimum pH, optimum contact time and the optimum concentration. A result of the adsorption study of [AuCl4]– on both adsorbents was optimum at pH 3 and fitted well to Langmuir isotherm and pseudo second-order kinetic models. The adsorption capacity of UMHT (ultrasonic technique) was 66.67 mg g-1 and it was higher than that of MHT (mechanic technique), i.e. 31.25 mg g-1. This shows that the ultrasonic radiation technique can increase the adsorption capacity of the [AuCl4]–. Based on the desorption using 0.5 mol L-1 NaOH solution, more [AuCl4]– was eluted from MHT, indicating that [AuCl4]– was weakly bound on MHT than UMHT.

Room Temperature Synthesis of Magnetite Particles by an Oil Membrane Layer-Assisted Reverse Co-Precipitation Approach

2021 ◽  
Vol 1162 ◽  
pp. 41-46
Author(s):  
Uripto Trisno Santoso ◽  
Abdullah ◽  
Dwi Rasy Mujiyanti ◽  
Dahlena Ariyani ◽  
Joyo Waskito
Keyword(s):  
Room Temperature ◽  
Cost Effective ◽  
Inert Gases ◽  
Precipitation Method ◽  
Ambient Atmosphere ◽  
Membrane Layer ◽  
Naoh Solution ◽  
Effective Synthesis ◽  
Magnetite Particles ◽  
Co Precipitation

Reverse co-precipitation (RCP) in ambient atmosphere is one of the strategies to produce magnetite nanoparticles in a rapid, simple, and cost-effective synthesis route without applying temperature surfactants or inert gases. However, RCP of ferrous/ferric blended salt in sodium hydroxide (NaOH) solution in an oxidizing medium produced of maghemite as a dominant phase rather than magnetite because of the oxidation of Fe2+ to Fe3+ happened. Based on this background, an oil membrane layer-assisted reverse co-precipitation approach has been examined to synthesis of magnetite in ambient atmosphere at room temperature. The result showed that although addition of benzene as an oil membrane layer was effective to prevent oxidation of magnetite to maghemite, but the magnetite particle size for the samples from the oil membrane layer-assisted reverse co-precipitation method was much larger than that from a reverse co-precipitation method without addition of oil membrane layer.

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