scholarly journals Bismuth Basic Nitrate as a Novel Adsorbent for Azo Dye Removal

2012 ◽  
Vol 9 (4) ◽  
pp. 1885-1896 ◽  
Author(s):  
E. A. Abdullah ◽  
A. H. Abdullah ◽  
Z. Zainal ◽  
M. Z. Hussein ◽  
T. K. Ban
Keyword(s):  
Aqueous Solutions ◽  
Organic Contaminants ◽  
Structural Characteristics ◽  
Analytical Techniques ◽  
Point Of Zero Charge ◽  
Precipitation Method ◽  
Sunset Yellow ◽  
Ag Particles ◽  
Efficient Route ◽  
Potential Use

Bismuth basic nitrate (BBN) and its TiO2-Ag modified sorbent, PTBA were successfully synthesized via a precipitation method. The structural characteristics of prepared sorbents were determined through different analytical techniques. The potential use of prepared sorbents for organic compounds' removal was evaluated using Methyl Orange and Sunset Yellow dyes as model pollutants in aqueous solutions. The experimental results showed that the presence of TiO2and Ag particles during the crystal growth of bismuth basic nitrate has an effect on the crystal structure, point of zero charge (pHpzc), pore volume and diameter. The lower binding energy of Ti 2p core level peak indicates the octahedral coordination of TiO2particles on the PTBA surface. The alteration of hydrophilic-hydrophobic characteristics of sorbent's surface improves the adsorptive performance of the modified sorbent and provides an efficient route for organic contaminants' removal from aqueous solutions.

scholarly journals Structural characteristics, analytical techniques and interactions with organic contaminants of dissolved organic matter derived from crop straw: a critical review

RSC Advances ◽  
2018 ◽  
Vol 8 (64) ◽  
pp. 36927-36938
Author(s):  
Bin Wang ◽  
Chang Liu ◽  
Yuwei Chen ◽  
Faqin Dong ◽  
Shu Chen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Critical Review ◽  
Organic Contaminants ◽  
Structural Characteristics ◽  
Fate And Transport ◽  
Analytical Techniques ◽  
Crop Straw

Analytical techniques for structural characteristics of dissolved organic matter derived from crop straw (CDOM), and the effect of CDOM on the fate and transport of organic contaminants (OCs).

THE EFFECT OF VARIOUS PHYSICAL AND CHEMICAL ROUTES ON TEXTURAL AND STRUCTURAL CHARACTRISTICS OF SYNTHESIZED Ni(OH)2 NANOPARTICLES

2012 ◽  
Vol 05 ◽  
pp. 24-32
Author(s):  
HOSEIN ZAREI ◽  
AMIR ALI YUZBASHI
Keyword(s):  
Nickel Hydroxide ◽  
Structural Characteristics ◽  
Analytical Techniques ◽  
Precipitation Method ◽  
Physical And Chemical

Nano-sized nickel hydroxide powder has been synthesized by complexation-precipitation method through various decomposition routes in order to investigate its effect on textural and structural characteristics of the nickel hydroxide products. The products were then characterized by various analytical techniques such as XRD, SEM, ICP and FTIR. The results showed that the product with different size, shape and structure could be obtained by using different routes for decomposition of the complex.

scholarly journals Preparation and sorption property study of Fe3O4/Al2O3/ZrO2 composite for the removal of cadmium, lead and chromium ions from aqueous solutions

2020 ◽  
Vol 34 (1) ◽  
pp. 105-121
Author(s):  
Fekadu Tsegaye ◽  
Abi M. Taddesse ◽  
Endale Teju ◽  
Minbale Aschalew
Keyword(s):  
Aqueous Solutions ◽  
Mixed Oxides ◽  
Sorption Property ◽  
Freundlich Isotherm ◽  
Experimental Results ◽  
Point Of Zero Charge ◽  
Precipitation Method ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
X Ray

Fe-Al-Zr ternary mixed oxides composite was synthesized via co-precipitation method for the removal Pb(II), Cd(II) and Cr(VI) ions from aqueous solutions. The as-synthesized materials were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), scanning electron microscope hyphenated with energy dispersive X-ray diffraction (SEM-EDX) and Fourier transform infrared (FTIR) techniques. The pH at the point of zero charge (pHpzc) of the sorbent and effect of ionic strength on sorption were also determined. The batch tests were conducted to optimize the various sorption parameters such as pH, adsorbent dose, contact time, speed of agitation and initial metal concentration. The experimental results showed that the adsorbed amounts of Pb(II), Cd(II) and Cr(VI) tend to decrease with increase in pH. Freundlich isotherm model fits better the equilibrium data for the adsorbent. Kinetic data correlated better with both pseudo first order and pseudo second order kinetic models. The spontaneous nature of the adsorption process was also confirmed from thermodynamic grounds. The nanosized adsorbent exhibited an adsorption efficiency of 96.65%, 96.55% and 97.2% for Cd(II), Cr(VI) and Pb(II), respectively, at optimum condition. Experimental results showed that the nanocomposite was effective for the removal of the title heavy metals from aqueous solution.   Bull. Chem. Soc. Ethiop. 2020, 34(1), 105-121. DOI: https://dx.doi.org/10.4314/bcse.v34i1.10

scholarly journals Structural Characteristics, Rheological Properties, and Antioxidant Activity of Novel Polysaccharides from “Deer Tripe Mushroom”

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Hewen Hu ◽  
Xu Teng ◽  
Shanshan Zhang ◽  
Tingting Liu ◽  
Xiao Li ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Galacturonic Acid ◽  
Structural Characteristics ◽  
Analytical Techniques ◽  
Dose Effect ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Gas Chromatography Mass Spectrometry ◽  
Resonance Spectroscopy ◽  
Main Component

The polysaccharide was extracted by water extraction and alcohol precipitation method from “deer tripe mushroom,” which was domesticated and bred from wild Auricularia delicata in Zambia. The structure of the deer tripe mushroom polysaccharide (DTMP) was characterized by gas chromatography-mass spectrometry (GC-MS), Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (NMR), scanning electron microscope (SEM), and other analytical techniques. And the rheological and gel properties and antioxidant capacities of the polysaccharide were studied. The results showed that DTMP was mainly composed of mannose, fructose, glucose, and galacturonic acid, of which the galacturonic acid was the main component. By calculation, the molar ratio of mannose : fructose : glucose : galactoacid in DTMP is 0.8 : 14.8 : 1.0 : 26.32. The polysaccharide was mainly composed by α-1,4-glycosidic bond. DTMP solution showed a shear-thinning (pseudoplastic) behaviour, and its pseudoplasticity was more obvious at a concentration of 2%. The power law model was used to evaluate the viscosity curves of DTMP, and its viscosity and consistency indices both increased as the concentration increased, whereas both indices decreased as the concentration decreased. The viscosity of the polysaccharide solution changed as the pH changed: the polysaccharide solutions had a higher viscosity at pH = 10. DTMP showed gel-like behaviour (G′ ＞ G″), and the gel strength enhanced with the increase of concentration (2%–10%). In addition, the antioxidant experiment of DTMP showed that it had good antioxidant activity, and there was a significant dose-effect relationship between its activity and concentration in the low concentration range.

scholarly journals Application of response surface methodology for uranium(VI) adsorption using hydroxyapatite prepared from eggshells waste material: study of influencing factors and mechanism

2021 ◽  
Author(s):  
Safir Ouassel ◽  
Salah Chegrouche ◽  
Djamel Nibou ◽  
Redouane Melikchi ◽  
Abderahmane Aknoun ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Low Cost ◽  
Point Of Zero Charge ◽  
Precipitation Method ◽  
Type Model ◽  
Batch Adsorption ◽  
X Ray Diffraction ◽  
Raman Spectrometry ◽  
Uranyl Carbonate ◽  
Pseudo Second Order

Abstract Hydroxyapatite (HAp) was synthesized from biowaste hen eggshells by wet precipitation method in which calcium hydroxide and phosphoric acid were used as precursors. The effectiveness of uranium(VI) adsorption onto HAp was investigated by batch adsorption experiments from aqueous solutions. The obtained HAp powder was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectrometry, point of zero charge and Scanning electron microscope. The factors and levels used during the experiments were pH (2–5), adsorbent mass (0.01–0.05 g), and initial U(VI) concentration (100–310 mg L−1). A Box–Behnken design combined with analysis of variance was used to interpret the main effect influencing the adsorption. The results showed that pH was the most significant parameter affecting U(VI). The kinetic data correlates well with the pseudo-second-order model. The adsorption isotherms fitted the Langmuir-1 type model with the qmax = 175.22 mg g−1 at 25 °C. The calculated value of the mean free energy indicates the chemisorption process. Under optimal conditions, the uranium effluent derived from the precipitation of ammonium uranyl carbonate removal performance of 98% was achieved. This study proved that HAp prepared from eggshell was an ecofriendly and low-cost adsorbent and was very effective for the adsorption of U(VI) from aqueous solutions.

Instant 99mTc Compounds

1971 ◽  
Vol 10 (03) ◽  
pp. 245-251 ◽  
Author(s):  
P. Richards ◽  
W. C. Eckelman
Keyword(s):  
Physical Properties ◽  
High Purity ◽  
Analytical Techniques ◽  
Full Potential ◽  
Labeled Compounds ◽  
Ph Adjustment ◽  
One Step ◽  
Stannous Ion ◽  
99Mtc Radiopharmaceuticals ◽  
Potential Use

SummaryThe full potential use of technetium has not been achieved despite its ideal physical properties, dosimetry and availability because of the complex preparations required for 99mTc radiopharmaceuticals. One of the goals of our work is to develop techniques for the preparation of high-purity 99mTc compounds which can be easily prepared, ideally by adding pertechnetate to a prepared solution.The use of stannous ion as reducing agent for technetium makes it possible to obtain such one-step, high-purity products. All non-radioactive components can be premixed in a single vial before addition of the radioactive pertechnetate. No final pH adjustment, further chemical manipulation or purification is required.Procedures for two instantly labeled compounds have been developed to date: 99mTc DTPA and 99mTc HSA. The 99mTc DTPA is prepared by adding pertechnetate to a previously prepared solution of stannous ion and CaNa3 DTPA which has been stored at pH 4. The 99mTc HSA is prepared by adding pertechnetate to a solution of stannous ion and HSA. The parametric variations and analytical techniques involved in formulating these procedures are described. It appears that development of kits for other biologically interesting compounds may be possible using similar procedures.

Exploring the characterization of Ni doped MgO nanoparticles using co-precipitation method

2020 ◽  
Vol 3 (1) ◽  
pp. 30-33
Author(s):  
Muthulakshmi M ◽  
Madhumitha G
Keyword(s):  
Magnesium Oxide ◽  
Analytical Techniques ◽  
Nickel Chloride ◽  
Precipitation Method ◽  
Crystalline Powder ◽  
High Melting Point ◽  
Design Synthesis ◽  
Mgo Nanoparticles ◽  
Co Precipitation

Nanotechnology is a field of applied science focused on design, synthesis and characterization of nanomaterials. The nickel and magnesium have improved their applications in transparent electrodes and nano electronics. In addition, magnesium oxide has moisture resistance and high melting point properties. In the present work has been carried out in the development of green crystalline powder of nickel doped magnesium oxide nanoparticles by Co-precipitation method, from the mixture of nickel chloride and magnesium chloride with KOH as solvent. From the XRD results, crystalline size of the particle can be observed. Spherical structure of Ni doped MgO nanoparticles were indicated by SEM results and powdered composition of samples were obtained from FTIR. EDAX represents the peak composition of the nanoparticle. The above analytical techniques have confirmed that the Ni doped MgO nanoparticles obtained from the mixture of NiCl2 and MgCl2.

Effectiveness of Calcium Deficiency in Nanosized Hydroxyapatite for Removal of Fe(II), Cu(II), Ni(II) and Cr(VI) Ions from Aqueous Solutions

2019 ◽  
Vol 56 ◽  
pp. 17-27
Author(s):  
Van Dat Doan ◽  
Van Thuan Le ◽  
Hoang Sinh Le ◽  
Dinh Hien Ta ◽  
Hoai Thuong Nguyen
Keyword(s):  
Electron Microscopy ◽  
Ion Exchange ◽  
Aqueous Solutions ◽  
Calcium Deficiency ◽  
Exchange Mechanism ◽  
Precipitation Method ◽  
X Ray ◽  
Transmission Electron ◽  
Bet Method ◽  
Langmuir Isotherm Model

In this work, nanosized calcium deficient hydroxyapatite (nCDHA) was synthesized by the precipitation method, and then utilized as an adsorbent for removal of Fe (II), Cu (II), Ni (II) and Cr (VI) ions from aqueous solutions after characterizing it by various techniques as scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and BET method. A possible structure of synthesized nCDHA was proposed. The adsorption study indicated that the adsorption equilibrium is well fitted with Langmuir isotherm model with the maximum adsorption capacities followed the order of Fe (II) > Cu (II) > Ni (II) > Cr (VI) with the values of 137.23, 128.02, 83.19 and 2.92 mg/g, respectively. The ion-exchange mechanism was dominant for the adsorption of metal ions onto nCDHA at initial metal concentrations lower than 0.01 mol/L. Along with the ion-exchange mechanism, there was an additional precipitation occurred on the surface of nCDHA in the case of Fe (II) and Cu (II) at initial concentrations higher than 0.01 mol/L.

Effects of pyrolysis temperature on the physicochemical properties of biochar derived from vermicompost and its potential use as an environmental amendment

RSC Advances ◽  
2015 ◽  
Vol 5 (50) ◽  
pp. 40117-40125 ◽  
Author(s):  
Gang Yang ◽  
Zhanghong Wang ◽  
Qiming Xian ◽  
Fei Shen ◽  
Cheng Sun ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Aqueous Solutions ◽  
Pyrolysis Temperature ◽  
Potential Use

Biochar derived from vermicompost can be employed as an excellent adsorbent for removing contaminants from aqueous solutions.

Study on a Nuclear Fuel Reprocessing System Based on the Precipitation Method in Mild Aqueous Solutions

1997 ◽  
Vol 120 (3) ◽  
pp. 198-210 ◽  
Author(s):  
Yuichiro Asano ◽  
Noriko Asanuma ◽  
Toshihiko Ito ◽  
Makoto Kataoka ◽  
Shinya Fujino ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Nuclear Fuel ◽  
Precipitation Method ◽  
Nuclear Fuel Reprocessing ◽  
Fuel Reprocessing
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