Influence of pH, β-Cyclodextrin, and Metal Ions on the Solubility and Stability of the Medicinally Competent Isoxazole Derivative of Curcumin: A Photophysical Study

2021 ◽  
Author(s):  
Manisha Sharma ◽  
Mamta Kumari ◽  
Swati Rani ◽  
Amit Yadav ◽  
Pratima R. Solanki ◽  
...  
Keyword(s):  
Metal Ions ◽  
Isoxazole Derivative ◽  
Photophysical Study ◽  
Influence Of Ph

scholarly journals Synthesis and Characterization of Piperidin-4-one Derivatives Using Green Solvent

2020 ◽  
Vol 32 (4) ◽  
pp. 727-732
Author(s):  
Harish Sharma ◽  
Rajesh Kumar ◽  
Mahesh Chandra Vishwakarma ◽  
Sushil Kumar Joshi ◽  
Narender Singh Bhandari
Keyword(s):  
Metal Ions ◽  
Contact Time ◽  
Metal Ion ◽  
Low Cost ◽  
Ion Concentration ◽  
Green Solvent ◽  
Optimum Ph ◽  
Influence Of Ph ◽  
Biosorption Equilibrium

In present study, Pyras pashia leaves were used as low cost biosorbent to study biosorption of Cu(II), Pb(II) and Cd(II) ions from contaminated wastewater. In the employed batch methods pH, contact time, metal ion concentration, temperature, biosorbent doses were taken as study parameters. The pH was varied from pH 1-9 to study the influence of pH on biosorption of metal ions by Pyras pashia. The optimum pH for the removal of Cu(II), Pb(II) and Cd(II) is observed at pH 5. The biosorption equilibrium time was varied between 15-75 min. Langmuir, Freundlich and Temkin isotherms were employed to study the biosorption. The biosorption parameter fits well with Langmuir isotherm. The biosorption of metal ions was increased with increasing biosorbent dose and contact time while increase in pH, metal ion concentration and temperature decrease the biosorption. Thermodynamic data suggest that the bisorption process was spontaneous, feasible and endothermic.

Influence of pH gradients on the transbilayer transport of drugs, lipids, peptides and metal ions into large unilamellar vesicles

1997 ◽  
Vol 1331 (2) ◽  
pp. 187-211 ◽  
Author(s):  
Pieter R Cullis ◽  
Michael J Hope ◽  
Marcel B Bally ◽  
Thomas D Madden ◽  
Lawrence D Mayer ◽  
...  
Keyword(s):  
Metal Ions ◽  
Unilamellar Vesicles ◽  
Ph Gradients ◽  
Large Unilamellar Vesicles ◽  
Influence Of Ph

Influence of pH on photocatalytic reduction, adsorption, and deposition of metal ions: speciation modeling

2014 ◽  
Vol 56 (5) ◽  
pp. 1335-1363 ◽  
Author(s):  
Rajendra Singh Thakur ◽  
Rubina Chaudhary ◽  
Chandan Singh
Keyword(s):  
Metal Ions ◽  
Photocatalytic Reduction ◽  
Influence Of Ph

scholarly journals ADSORPSI ION LOGAM Fe DALAM LIMBAH TEKSTIL SINTESIS DENGAN MENGGUNAKAN METODE BATCH

2018 ◽  
Vol 2 (2) ◽  
pp. 68
Author(s):  
Muhammad Arief Karim ◽  
Heni Juniar ◽  
M. Fitria Putri Ambarsari
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Ph Value ◽  
Batch Process ◽  
Two Factors ◽  
The Matrix ◽  
Initial Ph ◽  
Stirring Time ◽  
Influence Of Ph ◽  
Predetermined Time

Adsorption is a process occurs in a fluid, either it is liquid or gas, bonded in a solid or liquid (absorbent agent, adsorbent) and eventually creates a thin layer or film (adsorbed agent, adsorbent) on its surface. In this study, the writer did the process of the adsorption of Fe metal ion to the adsorbent of carbide waste that has been processed into tablet with 3x5 mm size, adsorption was done with Batch process by stirring 15gr or adsorbent into 100ml of synthetic waste with 50rpm stirring speed. There are two factors that influence the decrease of Fe metal concentration in synthesis waste which is the influence of pH and time. This study used variables of adsorption time (1; 2; 3; 4; 5; 6) hours with pH (2.5; 4.1) for each hour with an initial concentration of Fe 800g metal ions. This study was conducted to obtain the optimum value of pH and concentration of final Fe metal ions with the comparison of initial pH ratio and predetermined time. Seen from the matrix results of the study, it can be concluded that the longer the stirring time the more metal ions are absorbed by the adsorbent of carbide waste and pH value also rises.

scholarly journals Comparative Study on Biosorption of Zn(II), Cu(II) and Cr(VI) from Textile Dye Effluent Using Sawdust and Neem Leaves Powder

2010 ◽  
Vol 7 (s1) ◽  
pp. S504-S510 ◽  
Author(s):  
K. Gopalakrishnan ◽  
V. Manivannan ◽  
T. Jeyadoss
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Contact Time ◽  
Heavy Metal Ions ◽  
Low Cost ◽  
Textile Dye ◽  
Adsorbent Dosage ◽  
Neem Leaves ◽  
Textile Dye Effluent ◽  
Influence Of Ph

The performance of the low cost adsorbents such as sawdust and neem leaves powder in removing the heavy metals like Zn(II), Cu(II) and Cr(VI) from textile dye effluent are reported. Adsorbent dosage, pH and contact time were taken as parameters for biosorption study. Removal of heavy metal ions from the textile dye effluent increases with increase in adsorbent dosage. The influence of pH and contact time was maximum for removal of heavy metal ions. The presence of the decreased heavy metal toxicity in the treated textile dye effluent was evaluated through the percentage of seed germination ofVigna mungoL. On comparison, sawdust was found to be good adsorbent compared to neem leaves powder.

scholarly journals THE INFLUENCE OF pH TOWARDS MULTIPLE METAL ION ADSORPTION OF Cu(II), Zn(II), Mn(II), AND Fe(II) ON HUMIC ACID

2010 ◽  
Vol 6 (1) ◽  
pp. 43-46 ◽  
Author(s):  
Buhani Buhani ◽  
Suharso Suharso
Keyword(s):  
Humic Acid ◽  
Metal Ions ◽  
Metal Ion ◽  
Ion Adsorption ◽  
Batch Method ◽  
Metal Ion Adsorption ◽  
Before And After ◽  
General Capacity ◽  
Adsorption Energies ◽  
Influence Of Ph

Multiple metal ions adsorption of Cu(II), Zn(II), Mn(II) and Fe(II) on humic acid with a batch method has been carried out at pH interaction of 3, 5, and 6. Concentration of metal ions in solution before and after interaction was analyzed with Atomic Absorption Spectrophotometer (AAS). Result showed that adsorption multiple metal ions of Cu(II), Zn(II), Mn(II), and Fe(II) on humic acid is optimum at pH 5. Adsorption energies of the multiple metal ions Cu(II), Zn(II), Mn(II), and Fe(II) on humic acid at pH 3, 5, and 6 are around 35.0 - 37.6 kJ/mole. In general, capacity of competition adsorption of the multiple metal ions has an order as follows; Cu(II) < Fe(II) < Zn(II) < Mn(II).   Keywords: Humic acid, adsorption, multiple metal

scholarly journals Poly(sodium acrylate) hydrogels as potential pH-sensitive sorbents for the removal of model organic and inorganic pollutants from water

2013 ◽  
Vol 12 (3) ◽  
pp. 262-269
Keyword(s):  
Metal Ions ◽  
Crystal Violet ◽  
Metal Ion ◽  
Electrostatic Interactions ◽  
Driving Forces ◽  
Coordination Complexes ◽  
Sodium Acrylate ◽  
Inorganic Pollutants ◽  
Carboxylate Anions ◽  
Influence Of Ph

Anionic poly(sodium acrylate), PANa, hydrogels bearing negatively charged –COO- groups were used as sorbents for the removal of colored organic or inorganic model pollutants, namely Crystal Violet and Cu2+, from water. It was found that PANa hydrogels adsorb stronger Cu2+ions than Crystal Violet, as a consequence of the formation of coordination complexes between the hydrogel and the metal ions, while just electrostatic interactions are the major driving forces for Crystal Violet. Furthermore, the influence of pH, i.e. the neutralization degree i of the hydrogel, on its adsorption efficiency was investigated. It is shown that the adsorption of Cu2+ ions follows stoichiometry, namely one metal ion per two carboxylate anions. On the contrary, the adsorption of Crystal Violet is much lower than the charged stoichiometry.

scholarly journals STABILITY OF BETACYANIN PIGMENTS FROM RED PURPLE PITAYA FRUIT (Hylocereus polyrhizus) : INFLUENCE OF PH, TEMPERATURE, METAL IONS AND ASCORBIC ACID

2010 ◽  
Vol 7 (3) ◽  
pp. 327-331 ◽  
Author(s):  
Tang, C.S Tang, C.S ◽  
Norziah M.H Norziah M.H
Keyword(s):  
Ascorbic Acid ◽  
Metal Ions ◽  
Elevated Temperatures ◽  
Pigment Stability ◽  
Pigment Contents ◽  
The Stability ◽  
Ph Range ◽  
Influence Of Ph ◽  
Hylocereus Polyrhizus

Betacyanin pigments from red-purple pitaya fruit (Hylocereus polyrhizus) could be an attractive source of red colourant for food application. This paper presents results on the extraction of betacyanin pigments from pitaya fruits grown locally in Malaysia. Both the flesh of the fruit and its mesocarp were investigated and it was found that the flesh had higher pigment contents compared to its peel component. The concentration of betacyanins expressed as betanin equivalents per 100 g of flesh and peel were 10.1 ± 0.6 mg and 6.7 ± 0.2 mg, respectively when 80% methanol was used.  The stability of betacyanin pigments were investigated at different pH, temperature and in presence of different concentrations of metal ions (Cu2+ and Fe2+) and ascorbic acid. The results showed that the pigment was most stable at pH range between 5 and 6. However, it forfeited its stability to the heat induced at elevated temperatures. Metal ions (Cu2+ and Fe2+) proved to be capable of accelerating betacyanin degradation, with Cu2+ exhibiting the greatest effect. By contrast, supplementation with ascorbic acid could enhance the pigment stability against the detrimental effects caused by pH, temperature and metal ions. Nevertheless, if the concentration of ascorbic acid exceeds 0.7 %, it may change its role from pigment stabilizer to become a pro-oxidant.    Keywords: Betacyanin, pigments, pitaya fruit, Hylocereus polyrhizus, ascorbic acid

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