scholarly journals THE ADSORPTION OF Pb(II) AND Cr(III) BY POLYPROPYLCALIX[4]ARENE POLYMER

2010 ◽  
Vol 9 (3) ◽  
pp. 437-444 ◽  
Author(s):  
Suryadi Budi Utomo ◽  
Jumina Jumina ◽  
Tutik Dwi Wahyuningsih
Keyword(s):  
Metal Binding ◽  
Adsorption Equilibrium ◽  
Yellow Crystal ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Heavy Metal Cations ◽  
Optimum Ph ◽  
Isotherm Adsorption ◽  
Pseudo Second Order ◽  
Relative Molecular Weight

A research has been conducted to investigate the adsorption behavior of Pb(II) and Cr(III) onto polypropylcalix[4]arene polymer. The polypropylcalix[4]arene polymer was synthesized in the presence of H2SO4 catalyst and chloroform under N2 condition for 5 h using 25-allyloxy-26,27,28-trihydroxycalyx[4]arene as the precursor. The Polymer was obtained as yellow crystal with melting point of  288-290 °C and its relative molecular weight was 44.810 g.mol-1. The application of polypropylcalix[4]arene for trapping heavy metal cations and its adsorption model were examined by stirring the suspension of the calixarene in the sample solutions for various pH, time, and concentration of Pb(II) and Cr(III) solution. Effect of pH on batch experiments for the mentioned ions indicated that the optimum pH for metal binding were 5 for lead(II) and chromium(III). The adsorption model of metal ions on polypropylcalix[4]arene followed both the pseudo second order adsorption of Ho's and Langmuir isotherm adsorption kinetics models with rate constant (k) were 6.81 x 101 min-1 for Pb(II) and 2.64 x 10-2 min-1 for Cr(III). The adsorption equilibrium constant, K, were 5.84 x 105 L.mol-1 for Pb(II) and 4.66 x 105 L.mol-1 for Cr(III). The maximum adsorption capacity of polypropylcalix[4]arene to Pb(II) and Cr(III) were 16.31 and 18.14 mg.g-1 with adsorption energy of 32.90 and 32.34 kJ.mol-1, respectively.   Keywords: polypropylcalix[4]arene, adsorption, Pb(II), and Cr(III)

scholarly journals KINETICS AND EQUILIBRIUM MODEL OF Pb(II) AND Cd(II) ADSORPTION ONTO TETRAKIS-THIOMETHYL-C-4-METHOXYPHENYLCALIX[4]RESORCINARENE

2012 ◽  
Vol 12 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Suryadi Budi Utomo ◽  
Jumina Jumina ◽  
Dwi Siswanta ◽  
Mustofa Mustofa
Keyword(s):  
Metal Ions ◽  
Metal Binding ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Freundlich Model ◽  
Optimum Ph ◽  
Before And After ◽  
Pseudo Second Order ◽  
Langmuir And Freundlich Equations ◽  
Equilibrium Adsorption Isotherm

The ability of tetrakis-thiomethyl-C-4-methoxyphenylcalix[4]resorcinarene for trapping Pb(II) and Cd(II) from aqueous solution at different pH, contact times, and initial metal concentration was investigated. Concentration of metal ions before and after interaction was analyzed by Atomic Absorption Spectrophotometer (AAS). The result indicated that tetrakis-thiomethyl-C-4-methoxyphenylcalix[4]resorcinarene is a good host for metal ions, where Cd(II) sorption capacity was higher than that of Pb(II). Effect of pH on batch experiments for the mentioned ions indicated that the optimum pH for metal binding were 5 for both of lead(II) and cadmium(II). In order to investigate the mechanism of adsorption, the 1st-order, pseudo 1st-order, and pseudo 2nd-order kinetic models were used. The adsorption model of metal ions on the resorcinarene followed pseudo second order of Ho & McKay expression. The equilibrium adsorption isotherm has been analyzed by Langmuir and Freundlich equations. Langmuir model had the higher correlation coefficient than that of Freundlich model.

scholarly journals Efficient trapping of cesium ions in water by titanate nanosheets: experimental and theoretical studies

2021 ◽  
Author(s):  
Luyao Lin ◽  
Ye Li ◽  
Jie Wan ◽  
Cong Liu ◽  
Xiaoli Wang ◽  
...  
Keyword(s):  
Ion Exchange ◽  
High Efficiency ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Cesium Ions ◽  
Isotherm Adsorption ◽  
Best Fitting ◽  
Pseudo Second Order

Abstract In recent years, TNS has attracted wide attention because of its simplicity in synthesis and high efficiency in ion exchange. The adsorption of cesium ions in aqueous solution by TNS was investigated in this stud. Results show that the removal rate of Cs (I) is about 88% when pH = 5.00 ± 0.05, C0 = 10 ppm and CTNS = 0.1 g/L. The adsorption equilibrium is reached in about 20 minutes and best fits pseudo-second order model, R2 = 0.9998; Compared with the Freundlich isotherm adsorption model and Temkin model, the Langmuir model has the best fitting effect, R2 = 0.9903. The fitting results show the maximum adsorption capacity of TNS for Cs (I) is 200.00 mg/g. The main adsorption mechanism of TNS to cesium ion is ion exchange. Therefore, TNS can be used as a potential adsorbent for effectively adsorbing Cs-containing wastewater.

Study on the Kinetics of Adsorption of Cadmium by Chitosan

2010 ◽  
Vol 160-162 ◽  
pp. 1804-1809
Author(s):  
Qiang Bi ◽  
Juan Qin Xue ◽  
Ying Juan Guo ◽  
Yu Jie Wang ◽  
Yun Feng Xue
Keyword(s):  
Kinetic Equations ◽  
Adsorption Kinetic ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Ph Values ◽  
Optimum Ph ◽  
Pseudo Second Order ◽  
Simulated Wastewater ◽  
Isotherm Equations ◽  
Kinetics Of

The adsorption of cadmium in simulated wastewater by chitosan was investigated. The influence of temperature, contact time and pH on adsorption efficiency of cadmium was examined. Some related mathematical models were used in the fitting of experimental data. The results showed that at room temperature, the optimum pH of adsorption is between 4 and 7. At lower pH values, a strong competition existed between cadmium ions and protons for sorption sites and the sorption efficiency was decreased. After 60 minutes the adsorption equilibrium can be achieved. Chitosan is very effective at removing cadmium with the maximum adsorption capacity is 112.05mg•g-1. The adsorption kinetic curves agree with the pseudo-second-order adsorption kinetic equations and the adsorption isotherms could be well described by Langmuir isotherm equations.

scholarly journals Sodium hydroxide modified rice husk for enhanced removal of copper ions

2018 ◽  
Vol 78 (7) ◽  
pp. 1615-1623 ◽  
Author(s):  
N. Priyantha ◽  
H. K. W. Sandamali ◽  
T. P. K. Kulasooriya
Keyword(s):  
Heavy Metal ◽  
Adsorption Capacity ◽  
Rice Husk ◽  
Copper Ions ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Natural Form ◽  
Langmuir Adsorption ◽  
Pseudo Second Order ◽  
Heavy Metal Adsorbent

Abstract Although rice husk (RH) is a readily available, natural, heavy metal adsorbent, adsorption capacity in its natural form is insufficient for certain heavy metal ions. In this context, the study is based on enhancement of the adsorption capacity of RH for Cu(II). NaOH modified rice husk (SRH) shows higher extent of removal for Cu(II) ions than that of heated rice husk (HRH) and HNO3 modified rice husk (NRH). The extent of removal of SRH is increased with the concentration of NaOH, and the optimum NaOH concentration is 0.2 mol dm−3, used to modify rice husk for further studies. The surface area of SRH is 215 m2 g−1, which is twice as much as that of HRH according to previous studies. The sorption of Cu(II) on SRH obeys the Langmuir adsorption model, leading to the maximum adsorption capacity of 1.19 × 104 mg kg−1. Kinetics studies show that the interaction of Cu(II) with SRH obeys pseudo second order kinetics. The X-ray fluorescence spectroscopy confirms the adsorption of Cu(II) on SRH, while desorption studies confirm that Cu(II) adsorbed on SRH does not leach it back to water under normal conditions.

scholarly journals Mechanosynthesis of MFe2O4 (M = Co, Ni, and Zn) Magnetic Nanoparticles for Pb Removal from Aqueous Solution

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
America R. Vazquez-Olmos ◽  
Mohamed Abatal ◽  
Roberto Y. Sato-Berru ◽  
G. K. Pedraza-Basulto ◽  
Valentin Garcia-Vazquez ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Xrd Analysis ◽  
Maximum Adsorption Capacity ◽  
Sorption Behavior ◽  
Order Kinetic ◽  
X Ray ◽  
Isotherm Adsorption ◽  
Crystallite Sizes ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Adsorption of Pb(II) from aqueous solution using MFe2O4 nanoferrites (M = Co, Ni, and Zn) was studied. Nanoferrite samples were prepared via the mechanochemical method and were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), micro-Raman, and vibrating sample magnetometry (VSM). XRD analysis confirms the formation of pure single phases of cubic ferrites with average crystallite sizes of 23.8, 19.4, and 19.2 nm for CoFe2O4, NiFe2O4, and ZnFe2O4, respectively. Only NiFe2O4 and ZnFe2O4 samples show superparamagnetic behavior at room temperature, whereas CoFe2O4 is ferromagnetic. Kinetics and isotherm adsorption studies for adsorption of Pb(II) were carried out. A pseudo-second-order kinetic describes the sorption behavior. The experimental data of the isotherms were well fitted to the Langmuir isotherm model. The maximum adsorption capacity of Pb(II) on the nanoferrites was found to be 20.58, 17.76, and 9.34 mg·g−1 for M = Co, Ni, and Zn, respectively.

Adsorption Characteristic of Steel Slag Haydite for Phosphorus Removal from Wastewater

2013 ◽  
Vol 690-693 ◽  
pp. 1033-1036 ◽  
Author(s):  
Xiao Liu ◽  
Mei Yang ◽  
Yong Yang
Keyword(s):  
Steel Slag ◽  
Phosphate Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Adsorption Characteristic ◽  
Adsorption Data ◽  
Isotherm Adsorption ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Increasing Temperature

Slag haydite made from steel slag and clay was used for phosphate adsorption, and adsorption characteristic was studied. Results showed that the uptake of phosphate was facilitated for pH 3-8, the adsorption process fitted with pseudo-second-order model and intra-particle diffusion model, and the equilibrium time was about 3h. Isotherm adsorption data on slag haydite were fitted by both the Freundlich and Langmuir models. It was found that the data follows the Langmuir model better, and the maximum adsorption capacity increased from 1.17mg·g-1 to 2.42mg·g-1 as temperature rose from 20°C to 40°C. Thermodynamic parameters G0, H0 andS0 showed that the adsorption was spontaneous, endothermic and entropy increase process and increasing temperature was favorable.

Chromium (VI) adsorption onto activated sulfate lignin

2009 ◽  
Vol 4 (2) ◽  
Author(s):  
Nassima Tazrouti ◽  
Moussa Amrani
Keyword(s):  
Adsorption Capacity ◽  
Contact Time ◽  
Analytical Data ◽  
Order Equation ◽  
Second Order ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Chromium Vi ◽  
Pseudo Second Order

Activated lignin having surface area of 1023 m2.g-1 has been prepared from sulfate lignin that was treated by 30 % H2O2 and carbonized at 300 °C in order to test the chromium (VI) adsorption from aqueous solution. The influence of contact time, pH, initial concentration of adsorbent and adsorbate and temperature on the adsorption capacity were investigated. The maximum removal of Cr(VI) was found to be 92,36 % at pH=2 and contact time of 80 min. Optimal concentration of lignin and Cr(VI) were found to be 3.8 g.l-1 and 180 mg.l-1, respectively. The adsorption kinetics was tested pseudo-first-order and pseudo-second-order equation. The analytical data were fitted well in a pseudo-second-order equation and the rate of removal of chromium was found to speed up with increasing temperature. Activation energy for the adsorption process was found to be 18.19 Kj.mol-1. The Langmuir and Freundlich adsorption isotherm models were applied to describe the isotherm and isotherm constants for the adsorption of Cr (VI) on lignin. These constants and correlation coefficients of the isotherm models were calculated and compared. Results indicated that Cr (VI) uptake could be described by the Langmuir adsorption model. The maximum adsorption capacity (qm) of Cr (VI) on lignin was 75.75 mg.g-1 at temperature of 40°C. The dimensionless equilibrium parameter (RL) signified a favorable adsorption of Cr (VI) on lignin and was found between 0.0601 and 0.818 (0<RL<1). The thermodynamic parameters like ΔG°, ΔS° and ΔH° were calculated and it has been found that the reaction was spontaneous and endothermic in nature. This study indicates that lignin has the potential to become an effective and economical adsorbent for removal Cr (VI) from the waste water.

Methylene Blue Adsorption onto NaOH Treated Leucaena leucocephala Leaf Power

2015 ◽  
Vol 752-753 ◽  
pp. 251-256
Author(s):  
Megat Ahmad Kamal Megat Hanafiah ◽  
Noor Fhadzilah Mansur ◽  
Wan Mohd Nazri Wan Ab Rahman ◽  
Mardhiah Ismail
Keyword(s):  
Methylene Blue ◽  
Industrial Wastewater ◽  
Adsorption Equilibrium ◽  
Langmuir Model ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Adsorption Parameters ◽  
Leaf Powder ◽  
Pseudo Second Order ◽  
Kinetics And Isotherms

The potential of sodium hydroxide (NaOH) modified Petai Belalang (Leucaenaleucocephala) leaf powder as a biosorbent for methylene blue removal from aqueous solutions was investigated. Adsorption parameters studied include initial dye concentration, pH, dosage, kinetics and isotherms. The pHzpc of chemically treated Leucaenaleucocephala leaf powder was 7.50 and adsorption equilibrium time was achieved after 60 min. The kinetic data was best represented by the pseudo-second order model. The maximum adsorption capacity predicted from Langmuir model was 208.33 mg g-1. This work indicated that NaOH treated Leucaenaleucocephala leaf powder can be an attractive biosorbent for MB removal from diluted industrial wastewater.

scholarly journals COMPARISON OF STINGING NETTLE ADSORPTION PERFORMANCE TOWARDS ANIONIC AND CATIONIC DYES

2021 ◽  
Vol 55 (9-10) ◽  
pp. 1131-1142
Author(s):  
BENGÜ ERTAN ◽  
Keyword(s):  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Stinging Nettle ◽  
First Order ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Adsorption Equilibrium Data ◽  
Cr Uptake

Stinging nettle was used as lignocellulosic adsorbent for the removal of cationic dye – malachite green (MG), and anionic dye – Congo red (CR), from aqueous solution, without any chemical pretreatment. The adsorption equilibrium data fitted well with the Langmuir model for the adsorption of both dyes, with the calculated maximum adsorption capacity of 270.27 mgg-1 and 172.14 mgg-1 for MG and CR, respectively. The adsorption process was controlled by the pseudo-second-order model in the adsorption of MG and by the pseudo-first-order model in the adsorption of CR. The thermodynamics modelling displayed that the process was spontaneous and endothermic. The π–π electron–donor interaction, hydrogen bonds and pore diffusion may also be effective, besides electrostatic interaction between the adsorbate and the adsorbent in the mechanism of MG and CR uptake.

scholarly journals Adsorption of Remazol Brilliant Blue R Using Amino-Functionalized Organosilane in Aqueous Solution

2017 ◽  
Vol 17 (3) ◽  
pp. 343 ◽  
Author(s):  
Ozi Adi Saputra ◽  
Alifia Harista Rachma ◽  
Desi Suci Handayani
Keyword(s):  
Adsorption Process ◽  
Morphological Structure ◽  
Brilliant Blue ◽  
Kinetic Rate ◽  
Isotherm Study ◽  
Remazol Brilliant Blue R ◽  
Infra Red ◽  
Optimum Ph ◽  
Isotherm Adsorption ◽  
Pseudo Second Order

Synthesis of amino functionalized organosilane (AFOS) via UV-irradiation method has been conducted. In this research, the precursors for synthesizing AFOS are 3-glycydiloxypropyl trimethoxysilane (GPTMS) and ethylene diamine. Synthesis of amino functionalized organosilane was performed for 16 h monitored by Infra-red spectroscopy technique. The morphological structure of AFOS was observed by scanning electron microscopy. The adsorption process was conducted in the batch method using Remazol Brilliant Blue R (RBBR) as anionic dye model. In this study, the pH, contact time and dyes concentration were varied to determine the optimum pH, kinetic and isotherm adsorption. Based on the calculation, the kinetic rate of the RBBR adsorbed onto AFOS was determined by k2 (pseudo second-order). Moreover, the isotherm study showed that the Langmuir model fitted for the adsorption of RBBR onto AFOS with Qm by 21.3 mg g-1.

Sign in / Sign up

Export Citation Format

Share Document