A green adsorbent for the removal of BTEX from aqueous media

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 14290-14305 ◽  
Author(s):  
M. Arshadi ◽  
H. Shakeri ◽  
J. W. L. Salvacion
Keyword(s):  
Citric Acid ◽  
Adsorption Mechanism ◽  
Aqueous Media ◽  
Green Adsorbent ◽  
Benzene Toluene

Ostrich bone waste (OBW) was modified chemically with citric acid and used as a bioadsorbent. The uptake of benzene, toluene, ethylbenzene, andp-xylene (BTEX) and the adsorption mechanism of BTEX by the green adsorbent (OBW-NaOH–CA) were studied.

Surface and Electrochemical Studies of Thin Film Diamond

2006 ◽  
Vol 956 ◽  
Author(s):  
John Foord ◽  
David Opperman
Keyword(s):  
Adsorption Mechanism ◽  
Physical Adsorption ◽  
Aqueous Media ◽  
Electrochemical Studies ◽  
Power Ultrasound ◽  
Diamond Electrode ◽  
Adsorption Processes ◽  
Electrode Interface ◽  
Protein Bovine Serum Albumin ◽  
Positively Charged

ABSTRACTThe behavior of diamond electrodes for electrochemical applications in aqueous media containing the protein bovine serum albumin has been explored, to examine the degree of electrode poisoning which occurs. Although the diamond electrode retains good activity in such solutions, electrode fouling is found at long contact times due to protein adsorption. Two adsorption processes are observed. The first is a simple physical adsorption mechanism, and can be simply reversed by washing the electrode in water. The second mechanism is only observed when negative potentials are applied to the diamond electrode and is attributed to the attraction and reaction of the positively charged protein at the electrode interface. Electrode poisoning is also observed in the presence of power ultrasound, although the electrochemical signals are usefully enhanced under these conditions due to enhanced mass transport to the electrode surface.

scholarly journals The Effect of the PVA/Chitosan/Citric Acid Ratio on the Hydrophilicity of Electrospun Nanofiber Meshes

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3557
Author(s):  
Zsuzsanna Czibulya ◽  
Attila Csík ◽  
Ferenc Tóth ◽  
Petra Pál ◽  
István Csarnovics ◽  
...  
Keyword(s):  
Citric Acid ◽  
Polyvinyl Alcohol ◽  
Aqueous Media ◽  
Physical Parameters ◽  
Negative Effects ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Acid Ratio ◽  
Cross Linkage ◽  
Dental Applications

In this study, scaffolds were prepared via an electrospinning method for application in oral cavities. The hydrophilicity of the fiber mesh is of paramount importance, as it promotes cell spreading; however, the most commonly used polyvinyl alcohol (PVA) and other hydrophilic fiber meshes immediately disintegrate in aqueous media. In contrast, the excessive hydrophobicity of the scaffolds already inhibits cells adhesion on the surface. Therefore, the hydrophilicity of the fiber meshes needed to be optimized. Scaffolds with different polyvinyl alcohol (PVA)/chitosan/citric acid ratios were prepared. The addition of chitosan and the heat initiated cross-linkage of the polymers via citric acid enhanced the scaffolds’ hydrophobicity. The optimization of this property could be followed by contact angle measurements, and the increased number of cross-linkages were also supported by IR spectroscopy results. The fibers’ physical parameters were monitored via low-vacuum scanning electron microscopy (SEM) and atomic force microscopy (AFM). As biocompatibility is essential for dental applications, Alamar Blue assay was used to prove that meshes do not have any negative effects on dental pulp stem cells. Our results showed that the optimization of the fiber nets was successful, as they will not disintegrate in intraoral cavities during dental applications.

scholarly journals Adsorptive removal of mercury from water by adsorbents derived from date pits

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Mohammad A. Al-Ghouti ◽  
Dana Da’ana ◽  
Mohammed Abu-Dieyeh ◽  
Majeda Khraisheh
Keyword(s):  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Low Cost ◽  
Agricultural Waste ◽  
Aqueous Media ◽  
Sem Analysis ◽  
Anthropogenic Sources ◽  
Safe Environment ◽  
Physical And Chemical ◽  
Date Pits

Abstract The current work presented here focuses on the remediation of mercury from water using modified low-cost materials. Modified date pits, low cost, minimal pretreatment steps and locally abundant agricultural waste materials were effectively employed as an adsorbent for remediating Hg2+ from aqueous media. Physical and chemical modification were developed such as thermal roasting (RDP), sulfur (SMRDP) and silane (SIMRDP) based modifications. Results showed that maximum adsorption by RDP was at pH 6, AC and both modifications was at pH 4. Furthermore, RDP has exothermic adsorption mechanism while AC, SMRDP, and SIMRDP have endothermic. All adsorbents except SIMRDP have spontaneous adsorption process. SEM analysis showed that the surface morphology of RDP was not significantly affected by different treatments while surface of AC was affected. The investigation for good adsorbents for Hg2+ uptake from different anthropogenic sources has been carried out by many investigators worldwide towards having a safe environment. In the current study, the highest Hg2+ adsorption of SMRDP was relatively high compared to other known adsorbents.

Effective removal of Pb(ii) using a graphene@ternary oxides composite as an adsorbent in aqueous media

2017 ◽  
Vol 41 (23) ◽  
pp. 14627-14634 ◽  
Author(s):  
Duong Duc La ◽  
Hoai Phuong Nguyen Thi ◽  
Tuan Anh Nguyen ◽  
Sheshanath V. Bhosale
Keyword(s):  
Hydrothermal Method ◽  
Adsorption Mechanism ◽  
Aqueous Media ◽  
Ternary Oxide ◽  
One Pot ◽  
Oxide Composite ◽  
Effective Removal ◽  
Ternary Oxides

A one-pot hydrothermal method to prepare a graphene@Fe–Mg–Cu ternary oxide composite and the proposed adsorption mechanism for removal of Pb(ii) ions.

scholarly journals THE ISOLATION OF CELL NUCLEI IN NON-AQUEOUS MEDIA

1952 ◽  
Vol 35 (3) ◽  
pp. 529-557 ◽  
Author(s):  
V. Allfrey ◽  
H. Stern ◽  
A. E. Mirsky ◽  
H. Saetren
Keyword(s):  
Citric Acid ◽  
Serum Proteins ◽  
Aqueous Media ◽  
Organic Media ◽  
Cell Nuclei ◽  
Intracellular Enzyme ◽  
Cytoplasmic Proteins ◽  
Immunological Tests ◽  
Avian Erythrocytes ◽  
Enzyme Distribution

1. A modified Behrens procedure is described for the isolation of nuclei from avian erythrocytes and from the liver, kidney, thymus, pancreas, heart, and intestinal mucosa of the calf or horse. 2. The purity of these nuclei has been established by staining reactions, enzyme studies, and immunological tests for serum proteins. 3. Evidence is presented to show that a transport of cytoplasmic proteins into the nucleus does not occur during the isolation. 4. Nuclei prepared in non-aqueous media contain considerably more protein and a very different enzyme composition from that observed in nuclei prepared by "homogenization" techniques in dilute citric acid. 5. The suitability of nuclei prepared in organic media for the study of intracellular enzyme distribution is discussed.

Removal of Mercury (II) and Lead (II) from Aqueous Media by Using a Green Adsorbent: Kinetics, Thermodynamic, and Mechanism Studies

2018 ◽  
Vol 22 (2) ◽  
pp. 04017026 ◽  
Author(s):  
Mohammad Javad Amiri ◽  
Mohammad Arshadi ◽  
Evangelos Giannakopoulos ◽  
Ioannis K. Kalavrouziotis
Keyword(s):  
Aqueous Media ◽  
Green Adsorbent

scholarly journals Rapid insertion of bismuth radioactive isotopes into texaphyrin in aqueous media

2017 ◽  
Vol 21 (12) ◽  
pp. 882-886 ◽  
Author(s):  
Grégory Thiabaud ◽  
Valery Radchenko ◽  
Justin J. Wilson ◽  
Kevin D. John ◽  
Eva R. Birnbaum ◽  
...  
Keyword(s):  
Citric Acid ◽  
Human Blood ◽  
Tumor Targeting ◽  
Aqueous Media ◽  
Water Soluble ◽  
Radioactive Isotopes ◽  
Human Blood Plasma ◽  
Organic Base ◽  
Targeted Alpha Therapy ◽  
Alpha Therapy

Radioisotopes [Formula: see text]Bi and [Formula: see text]Bi were successfully inserted into a water-soluble and tumor-targeting texaphyrin ligand. The reaction with [Formula: see text]Bi(OAc)[Formula: see text] proceeds in about 15 min in aqueous media without the use of any organic base. The Bi(III) texaphyrin complex formed (3) is stable in aqueous media even in the presence of an excess of competitive chelators (EDTA or citric acid), as well as in human blood plasma. These results validate texaphyrins as potential candidates for coordinating bismuth radionuclides and set the stage for their use in targeted alpha therapy (TAT).

Electrochemical Behavior of Cobalt-Chromium Alloy as Biomaterial in Different pH Environments

2016 ◽  
Vol 1139 ◽  
pp. 59-63 ◽  
Author(s):  
Lidia Benea ◽  
Valentin Marian Dumitraşcu ◽  
Eliza Dănăilă
Keyword(s):  
Citric Acid ◽  
Ph Value ◽  
Artificial Saliva ◽  
Aqueous Media ◽  
Localized Corrosion ◽  
Chromium Alloy ◽  
Cobalt Chromium ◽  
Solution Ph ◽  
Liquid Environment ◽  
Cobalt Chromium Alloy

The paper discusses the electrochemical interactions of Co-Cr alloy with different physiological solutions and organic substances, containing different ions and different pH values, which should play a key role in the materials lifetime. The physical and chemical reactions are numerous and the passivity of the Co-Cr alloy is submitted to the influence of the liquid environment. Some electrochemical investigations were carried out for understanding and predicting the passivity and the corrosion resistance of Co-Cr alloy in three types of simulated body fluids (SBF), namely Fusayama Meyer artificial saliva (pH=5), Hank’s solution (pH=7.4), Ringer's solution (pH=6.6) and citric acid as organic solution. The reason of using another type of environment (other than SBF), such as citric acid is that this medium is a powerful oxidant and has a lower pH value (pH=1.8). This acid environment can influence the state (the formation and growth) of the oxide layer on the surface of the alloy. Research has shown different behavior of the cobalt chromium alloy according to the pH, the chloride content and the oxidizing nature of the environment. Co-Cr alloy biomaterial, immersed in four aqueous media reveals that there are different levels of stabilization of the potential and different current densities depending on the pH value. The Co-Cr alloy biomaterial is very sensitive to localized corrosion (pitting) in Hank solution.

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