scholarly journals Porphyrin-based electrostatically self-assembled multilayers as fluorescent probes for mercury(ii) ions: a study of the adsorption kinetics of metal ions on ultrathin films for sensing applications

RSC Advances ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 1350-1358 ◽  
Author(s):  
Monica Caselli
Keyword(s):  
Fluorescence Quenching ◽  
Metal Ions ◽  
Adsorption Kinetics ◽  
Fluorescent Probes ◽  
Ultrathin Films ◽  
Adsorption Process ◽  
Sensing Applications ◽  
Self Assembled ◽  
Solid Probe ◽  
Kinetics Of

ESAM as fluorescent probes for Hg(ii) ions were developed. The adsorption process involved in analyte-solid probe interaction was studied by monitoring fluorescence quenching.

scholarly journals STUDY ON THE ADSORPTION PROPERTIES OF NOVEL CALIX[6]ARENE POLYMERS FOR HEAVY METAL CATIONS

2012 ◽  
Vol 12 (1) ◽  
pp. 28-34 ◽  
Author(s):  
Susy Yunita Prabawati ◽  
Jumina Jumina ◽  
Sri Juari Santosa ◽  
Mustofa Mustofa ◽  
Keisuke Ohto
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Kinetics ◽  
Contact Time ◽  
Adsorption Process ◽  
Metal Cations ◽  
Kinetics Model ◽  
Batch Method ◽  
Heavy Metal Cations ◽  
Kinetics Of

A research has been conducted to investigate the capability of a series of novel calix[6]arenes-based polymers: poly-monoallyloxycalix[6]arene (2a), poly-monoallyloxypenta-estercalix[6]arene (2b) and poly-monoallyloxypenta-acidcalix[6]arene (2c) for trapping of heavy metal cations such as Cd(II), Cu(II) and Cr(III). The existence of active hydroxy group (-OH) and with a tunnel-like structure of the polymers, caused the polymers can be used as adsorbents for heavy metals. The adsorption process was carried out in batch method in the variation of acidity (pH), contact time and initial concentration of metal ions. The results showed that the amount of adsorbed metal increased with the increasing of the pH of metal solution. For these three polymers, the amount of metal ions Cd(II), Cu(II) and Cr(III) adsorbed was optimum at pH 7, 6 and 5 respectively. The optimum contact time for Cd(II) and Cu(II) was 120 min, while that for Cr(III) was 60 min. Study of the adsorption kinetics showed that the adsorption of Cd(II), Cu(II) and Cr(III) using polymer 2a followed kinetics model of Ho. For adsorbent 2b and 2c, the adsorption kinetics of Cd(II) and Cr(III) also followed kinetics model of Ho while for the Cu(II) followed Lagergren kinetic models. Isothermal studies showed that the adsorption of metal ions on all adsorbents tend to follow the Langmuir isotherm. The adsorption energies of the three adsorbents were higher than 23 kJ/mole and polymer 2c has the largest adsorption capacity for Cr(III).

Study on the Formaldehyde Adsorption Kinetics of Dry Waters

2014 ◽  
Vol 809-810 ◽  
pp. 907-911
Author(s):  
Jun Long Wang ◽  
Jie Hou ◽  
Ting Jiang ◽  
Yong Jun He ◽  
Yao Dong Liang
Keyword(s):  
Adsorption Kinetics ◽  
High Speed ◽  
Adsorption Process ◽  
Average Diameter ◽  
Adsorption Rate ◽  
Absorption Kinetics ◽  
Order Model ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Formaldehyde Adsorption

Dry waters with an average diameter of 82 μm were prepared by a high speed mixed route. The formaldehyde absorption kinetics of dry waters was investigated by simulating indoor formaldehyde pollution in glass chamber. The results showed that pseudo-second order model could be used to simulate the adsorption process; the adsorption rate was highest in the initial 60 minutes; when the adsorption lasted for 180 minutes, the adsorption reached equilibrium.

scholarly journals Eco-Friendly Sustainable Fluorescent Carbon Dots for the Adsorption of Heavy Metal Ions in Aqueous Environment

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 315 ◽  
Author(s):  
Musa Yahaya Pudza ◽  
Zurina Zainal Abidin ◽  
Suraya Abdul Rashid ◽  
Faizah Md Yasin ◽  
A. S. M. Noor ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Carbon Dots ◽  
Heavy Metal Ions ◽  
Active Sites ◽  
Adsorption Process ◽  
Coefficient Of Determination ◽  
Aqueous Environment ◽  
Order Kinetic ◽  
Sensing Applications

The materials and substances required for sustainable water treatment by adsorption technique, are still being researched widely by distinguished classes of researchers. Thus, the need to synthesize substances that can effectively clean up pollutants from the environment cannot be overemphasized. So far, materials in bulk forms that are rich in carbon, such as biochar and varieties of activated carbon have been used for various adsorptive purposes. The use of bulk materials for such purposes are not efficient due to minimal surface areas available for adsorption. This study explores the adsorption task at nano dimension using carbon dots (CDs) from tapioca. The properties of carbon structure and its influence on the adsorptive efficacy of carbon nanoparticles were investigated by energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), high resolution transmission electron microscopy (HrTEM), and atomic force microscopy (AFM). The results implied carbon present in CDs are good adsorbents for effective adsorption of heavy metal ions (lead) with removal efficiency of 80.6% in aqueous environment. The adsorption process as explored by both Langmuir and Freundlich isotherms have proven favorability of the adsorption process. Langmuir form two and three have correlation coefficients R2 at 0.9922 and 0.9912, respectively. The Freundlich isotherm confirms CDs as having defined surface heterogeneity and the exponential distribution of active sites. The adsorption of lead unto CDs obeyed the second order kinetic model with coefficient of determination, R2 of 0.9668 and 0.9996 at an initial lead concentration of 20 mg/L and 100 mg/L, respectively. The findings validated the efficiency of CDs derived from tapioca as an excellent material for further utilization in the environmental fields of wastewater pollution detection and clean up, bio-imaging, and chemical sensing applications.

Kinetic Process of Purple Cabbage Pigment on Macro Porous Absorbent Resin

2011 ◽  
Vol 236-238 ◽  
pp. 1987-1990
Author(s):  
Jian Hua Yi ◽  
Zhen Bao Zhu ◽  
Yuan Fang Wu
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Adsorption Kinetics ◽  
Temperature Increase ◽  
Adsorption Process ◽  
Adsorbent Resin ◽  
Temperature Range ◽  
Porous Adsorbent ◽  
Kinetics Of ◽  
Langmuir And Freundlich Models

The adsorption kinetics of purple cabbage pigment (PCP) on LSA-21 macro porous adsorbent resin were studied at different adsorbent resin concentrations (1, 2, 4, 8 g adsorbent resin per liter of purple cabbage extraction solution) for the temperature range of 20~50°C. The results showed that the adsorption of PCP in purple cabbage extraction solution onto LSA-21 macro porous adsorbent resin is highly in agreement with both Langmuir and Freundlich models. Heat of adsorption (ΔH) value of 11.976 kJ/mol indicates the endothermic adsorption process. A decrease of Gibbs free energy (ΔG) with temperature increase also indicates the spontaneous nature of the process.

scholarly journals Study of Kinetics and Adsorption Isotherm of Methylene Blue Dye using Tannin Gel from Ceriops tagal

2020 ◽  
Vol 23 (10) ◽  
pp. 370-376
Author(s):  
Thamrin Azis ◽  
La Ode Ahmad ◽  
Keke Awaliyah ◽  
Laode Abdul Kadir
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Contact Time ◽  
Adsorption Process ◽  
Blue Dye ◽  
Maximum Adsorption Capacity ◽  
Methylene Blue Dye ◽  
Ceriops Tagal ◽  
Kinetics Of

Research on the equilibrium and adsorption kinetics of methylene blue dye using tannin gel from the Tingi tree (Ceriops tagal) has been carried out. This study aims to determine the capacity and adsorption kinetics of tannin gel against methylene blue dye. Several parameters, such as the effect of contact time, pH, and methylene blue dye concentration on adsorption, were also studied. Based on the research results, the optimum adsorption process is a contact time of 30 minutes and a pH of 7. The adsorption capacity increased to a concentration of 80 mg/L with a maximum adsorption capacity (qm) of 49.261 mg/g. The adsorption process follows the pseudo-second-order adsorption kinetics model and the Langmuir isotherm model.

Modeling the Adsorption Kinetics of Divalent Metal Ions onto Pyrophyllite Using the Integral Method

2009 ◽  
Vol 48 (4) ◽  
pp. 2125-2128 ◽  
Author(s):  
Neelmani Gupta ◽  
Murari Prasad ◽  
Nidhi Singhal ◽  
Vineet Kumar
Keyword(s):  
Metal Ions ◽  
Adsorption Kinetics ◽  
Integral Method ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Kinetics Of

Adsorption Kinetics of Grape Seed Procyanidins on Macroporous Adsorbent Resin

2011 ◽  
Vol 396-398 ◽  
pp. 592-595 ◽  
Author(s):  
Ying Hua Song
Keyword(s):  
Adsorption Kinetics ◽  
Adsorption Process ◽  
Grape Seed ◽  
Macroporous Resin ◽  
Initial Concentration ◽  
Adsorption Mechanisms ◽  
First Order ◽  
Intra Particle Diffusion ◽  
Effects Of Temperature ◽  
Kinetics Of

Experiments were carried out to study the adsorption kinetics of grape seed procyanidins onto macroporous resin HZ818 from aqueous solutions.The effects of temperature,initial concentration and agitation on the adsorption kinetics have been investigated.Both the Lagergren-first-order equation and intra-particular diffusion model were used to describe the adsorption mechanisms. And the adsorption process were affected both by film diffusion and by intra-particle diffusion.The intra-particle diffusion rate constants increase with an increase in temperature,initial concentration and agitation speed.

Adsorption Kinetics of Phosphate on Ceria-Based Adsorbent

2013 ◽  
Vol 726-731 ◽  
pp. 1668-1672
Author(s):  
Bin Li ◽  
Hong Bin Wang ◽  
Yan Yuan
Keyword(s):  
Kinetic Equation ◽  
Influencing Factors ◽  
Adsorption Kinetics ◽  
Adsorption Process ◽  
Close Relation ◽  
Phosphate Adsorption ◽  
Order Kinetic ◽  
Adsorbent Surface ◽  
Kinetics Of ◽  
Order Kinetic Equation

The adsorption kinetics and influencing factors deduction showed that adsorption process accorded with a second-order kinetic equation according to academic hypothesis. The result was validated by the phosphate adsorption onto Veria-Based adsorbent. The factor (m/V)bhad the close relation with the adsorption speed and the adsorbent dosage, intensity exponent b=0.44 (0b1) in this test condition. All the results show that phosphate adsorption on the adsorbent surface was mono-layer chemisorptions and that the hypothesis of kinetic inference was reasonable.

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