scholarly journals Study the effect of positively charged natural ions on analytical figures of Merits of fluorometric analysis of Naphthalene and Anthracene in aqueous solution

2019 ◽  
Vol 24 (3) ◽  
Author(s):  
Bassam F. ALfarhani ◽  
Hassan A.A. Al – Rubaie
Keyword(s):  
Aqueous Solution ◽  
Drinking Water ◽  
Fluorescence Signal ◽  
Calcium Magnesium ◽  
Fluorometric Analysis ◽  
Positively Charged

Abstract: The effect of natural ions on the fluorescence signal of different PAHs has been studied. the analytical figures of merits have been measured without presence of natural ions, the values of maximum excitation and emission values were determined and the values of LOD and LOQ also measured. The Values of LOD and LOQ were in ppt levels. The second part of the work was determine the analytical figures of merits in the presence of natural ions (calcium, magnesium, potassium and sodium). And the values of LOD and LOQ were measured and a quenching in the fluorescence signal was spotted. Thereby, in the analysis of PAHs in drinking water that include natural ions, have to take in consideration that a higher value of LOD and LOQ will be seen.

scholarly journals The Effect of Ionic Charge on the Adsorption of Organic Dyes onto Titanate Nanotubes

2010 ◽  
Vol 63 (2) ◽  
pp. 270 ◽  
Author(s):  
Dmitry V. Bavykin ◽  
Katherine E. Redmond ◽  
Benjamin P. Nias ◽  
Alexander N. Kulak ◽  
Frank C. Walsh
Keyword(s):  
Aqueous Solution ◽  
Organic Dyes ◽  
Dye Adsorption ◽  
Titanate Nanotubes ◽  
Charged Surface ◽  
Dye Molecules ◽  
Ionic Charge ◽  
Eriochrome Black T ◽  
Opposite Trend ◽  
Positively Charged

The adsorption of dye molecules from aqueous solution onto the surface of titanate nanotubes (which have been synthesized via an alkaline hydrothermal treatment) has been studied. The ionic charge on the dye molecules was found to affect their ability to adsorb onto the titanate nanotube surface. In the case of (cationic) methylene blue, the adsorption was preferable on the negatively charged surface of titanate nanotubes rather than on positively charged P25 TiO2 nanoparticles. In the case of (anionic) Eriochrome Black T dye, the opposite trend was found. Herein, the dynamics of dye adsorption and the effect of pH on the adsorption capacity are considered.

scholarly journals FLUORESCENCE ENHANCEMENT OF Al3+– SODIUM MORIN–5–SULFONATE COMPLEX BY IMIDAZOLIUM IONIC LIQUID AND ITS APPLICATION IN DETERMINATION OF Al3+ IONS IN AN AQUEOUS SOLUTION

2019 ◽  
Vol 81 (2) ◽  
Author(s):  
Syaza Atikah Nizar ◽  
Nurul Syamimi Abdul Satar ◽  
Shaik Azri Shaik Amar ◽  
Fatin Hazirah Abdullah ◽  
Faizatul Shimal Mehamod ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquid ◽  
Acetic Acid ◽  
Ternary Complex ◽  
Fluorescence Enhancement ◽  
Calibration Graph ◽  
Fluorescence Signal ◽  
Binary Complex ◽  
Imidazolium Ionic Liquid

This study describes the preparation of sodium morin–5–sulfonate (NaMSA) as a new reagent for the determination of aluminium(III) (Al3+) ions based on the formation of a ternary complex. The complex consists of Al3+, NaMSA, and 1–Butyl–3–methylimidazolium hexafluorophosphate (BMIM–PF6). It was found that this method was sensitive compared to the binary complex of Al3+ and NaMSA. The ternary complex was excited at 420 nm, and the fluorescence signal was measured at 518 nm. Maximum fluorescence signal produced at pH 5.0 (acetic acid–acetate buffer), with 0.02% v/v BMIM–PF6 and 1.0 × 10-4 molL-1 of NaMSA. The calibration graph in linear up to 10 mgL-1 with the calculated detection limit of 0.017 mgL-1. Effect of foreign ions towards the ternary complex was also studied. Finally, the method was applied in the determination of Al3+ ions in water samples, and satisfactory results were obtained.

A self-assembled triphenylamine-based fluorescent chemosensor for selective detection of Fe3+ and Cu2+ ions in aqueous solution

RSC Advances ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 6869-6878 ◽  
Author(s):  
Li Wenfeng ◽  
Ma Hengchang ◽  
Lu con ◽  
Ma Yuan ◽  
Qi Chunxuan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Drinking Water ◽  
High Selectivity ◽  
Fluorescent Chemosensor ◽  
Selective Detection ◽  
Simple Method ◽  
Self Assembled ◽  
Nanomolar Range

Triphenylamine-based fluorescent chemosensor m-TAPA (S) shows high selectivity and sensitivity toward Fe3+/Cu2+ in natural and drinking water. Additionally, the TCL strips serve as a simple method for detection of Fe3+/Cu2+ at the nanomolar range.

Synthesis, Characterisation, and Performance of Polyaniline (PANI) in Metals Sorption

2020 ◽  
Vol 1008 ◽  
pp. 222-230
Author(s):  
Hamdiya Orleans-Boham ◽  
Ahmed Hassan El-Shazly ◽  
Marwa Farouk El-Kady ◽  
Joshua Chireboah-Ansah
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Metal Adsorption ◽  
Competitive Sorption ◽  
Metal System ◽  
Adsorption Experiment ◽  
Calcium Magnesium ◽  
Calcium And Magnesium ◽  
And Performance

PANI was prepared in-house, characterized and utilized in the sorption of calcium, magnesium, iron, and copper in aqueous solution. The objective of this research was to evaluate adsorption of metals in mono and multi-metal in aqueous solutions onto PANI. Literature has it that, there is no record for competitive sorption of metals by PANI. The characterization of the prepared PANI confirmed with other literature that it was the Emeraldine PANI that was prepared. The results obtained after the multi metal adsorption experiment showed that PANI has a good performance in the removal of copper, iron, calcium, and magnesium, and can be credited to its' large surface area since it is a nanomaterial. Testing for the selectivity showed that the prepared nanoPANI adsorbed 95.2% of lead, 93.8% of copper and 75.8% of the iron in the single metal system.

scholarly journals Removal Efficiency and Mechanism of Cr(VI) from Aqueous Solution by Maize Straw Biochars Derived at Different Pyrolysis Temperatures

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 781 ◽  
Author(s):  
Wang ◽  
Zhang ◽  
Lv
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
X Ray ◽  
Removal Capacity ◽  
Maize Straw ◽  
Efficient Adsorbent ◽  
Positively Charged ◽  
Maximum Removal

The removal efficiency and mechanism of Cr(VI) removal from aqueous solution on semi-decomposed maize straw biochars pyrolyzed at 300 to 600 °C were investigated. The removal of Cr(VI) by the biochars decreased with pyrolysis temperature increasing from 300 to 600 °C, and the maximum removal capacity of Cr(VI) for maize straw biochar pyrolyzed at 300 °C was 91 mg/g at pH 2.0. The percentage removal of Cr(VI) rapidly decreased with pH increasing from 2.0 to 8.0, with the maximum (>99.9%) at pH 2.0. The variation of Cr(VI) and Cr(III) concentrations in the solution after reaction showed that Cr(VI) concentration decreased while Cr(III) increased and the equilibrium was reached after 48 h, while the redox potential after reaction decreased due to Cr(VI) reduction. X-ray photoelectron spectroscopy (XPS) semi-quantitative analysis showed that Cr(III) accounted for 75.7% of the total Cr bound to maize straw biochar, which indicated reductive adsorption was responsible for Cr(VI) removal by the biochars. Cr(VI) was firstly adsorbed onto the positively charged biochar surface and reduced to Cr(III) by electrons provided by oxygen-containing functional groups (e.g., C=O), and subsequently part of the converted Cr(III) remained on the biochar surface and the rest released into solution. Fourier transform infrared (FTIR) data indicated the participation of C=O, Si–O, –CH2 and –CH3 groups in Cr(VI) removal by the biochars. This study showed that maize straw biochar pyrolyzed at 300 °C for 2 h was one low-cost and efficient adsorbent for Cr(VI) removal from aqueous solution.

Preparation of a positively charged nanofiltration membrane based on hydrophilic–hydrophobic transformation of a poly(ionic liquid)

2015 ◽  
Vol 3 (23) ◽  
pp. 12367-12376 ◽  
Author(s):  
Ying Tang ◽  
Beibei Tang ◽  
Peiyi Wu
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquid ◽  
Ion Exchange ◽  
Exchange Reaction ◽  
Composite Membrane ◽  
Nanofiltration Membrane ◽  
High Permeability ◽  
Ion Exchange Reaction ◽  
Poly Ionic Liquid ◽  
Positively Charged

A positively charged NF composite membrane with high permeability was obtained via a simple counter-ion exchange reaction in an aqueous solution, due to the hydrophilic–hydrophobic transformation of the PIL.

Fluoride removal from aqueous solution by Ca-pretreated macrophyte biomass

2008 ◽  
Vol 5 (1) ◽  
pp. 68 ◽  
Author(s):  
Patricia Miretzky ◽  
Carolina Muñoz ◽  
Alejandro Carrillo-Chávez
Keyword(s):  
Aqueous Solution ◽  
Developing Countries ◽  
Drinking Water ◽  
Sorption Capacity ◽  
Aquatic Macrophyte ◽  
Low Cost ◽  
Isotherm Models ◽  
Fluoride Removal ◽  
Natural Material ◽  
Macrophyte Biomass

Environmental context. Fluoride concentrations in drinking water above 1.5 mg L–1 may be detrimental to human health. Many methods have been developed for removing excessive fluoride from drinking water. The use of an aquatic macrophyte biomass (Eleocharis acicularis) pretreated with Ca2+, a low-cost natural material, could be a technique for rural populations in developing countries that cannot afford treated or bottled water for daily consumption. Abstract. The use of an aquatic macrophyte biomass (Eleocharis acicularis) pretreated with Ca2+ as a low-cost natural material for the removal of fluoride from aqueous solution was studied. Batch experiments were carried out to determine fluoride sorption capacity and the efficiency of the sorption process under different pH, initial F– and macrophyte biomass doses. The experimental data showed good fitting to Langmuir and Freundlich isotherm models. The maximum F adsorption capacity was 0.110 mmol g–1 with an efficiency of 64.5% (pH 6.0; 5.0 g L–1 Ca-pretreated biomass). The binding of Ca2+ to the biomass increased the removal efficiency over 100%. The F– removal kinetics were rapid, less than 30 min, and best described by the pseudo-second order rate model. The rate constant, the initial sorption rate and the equilibrium sorption capacity were determined. These results may be useful for deprived rural population water supply schemes in Mexico and in other developing countries.

scholarly journals Calcium, Magnesium, and Nitrate in Drinking Water and Gastric Cancer Mortality

1998 ◽  
Vol 89 (2) ◽  
pp. 124-130 ◽  
Author(s):  
Chun-Yuh Yang ◽  
Ming-Fen Cheng ◽  
Shang-Shyue Tsai ◽  
Ya-Lun Hsieh
Keyword(s):  
Gastric Cancer ◽  
Drinking Water ◽  
Cancer Mortality ◽  
Calcium Magnesium

Synthesis of Ni/Au/Co trimetallic nanoparticles and their catalytic activity for hydrogen generation from alkaline sodium borohydride aqueous solution

RSC Advances ◽  
2015 ◽  
Vol 5 (43) ◽  
pp. 34364-34371 ◽  
Author(s):  
Chengpeng Jiao ◽  
Zili Huang ◽  
Xiaofeng Wang ◽  
Haijun Zhang ◽  
Lilin Lu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Sodium Borohydride ◽  
Hydrogen Generation ◽  
Co Nanoparticles ◽  
Hydrolysis Of ◽  
Positively Charged

Alloyed Ni/Au/Co nanoparticles with negatively-charged Au, Co atoms, and positively-charged Ni atoms were prepared as effective catalysts for hydrolysis of NaBH4.

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