scholarly journals ADSORPTION OF GIBBERELLIC ACID ONTO NATURAL KAOLIN FROM TATAKAN, SOUTH KALIMANTAN

2010 ◽  
Vol 9 (3) ◽  
pp. 373-379 ◽  
Author(s):  
Sunardi Sunardi ◽  
Yateman Arryanto ◽  
Sutarno Sutarno
Keyword(s):  
Adsorption Isotherm ◽  
Gibberellic Acid ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Purification Process ◽  
X Ray ◽  
Langmuir Adsorption ◽  
Batch System

Adsorption of gibberellic acid (GA3) onto raw and purified kaolin from Tatakan, South Kalimantan was investigated in this study. Purification process was done by sedimentation to obtain relative pure kaolinite. Raw and purified kaolin samples were characterized by Fourier transformed infrared (FTIR) spectroscopy and X-ray diffractometer (XRD). The adsorption process was carried out in a batch system and the effect of pH, contact time and GA3 concentration were experimentally studied to evaluate the adsorption capacity. The amount of GA3 adsorbed was determined by UV spectrophotometer. The result showed that the raw kaolin from South Kalimantan consist of 53.36% kaolinite, 29.47% halloysite, 4.47% chlorite, 11.32% quartz and 1.38% christobalite and the purified kaolin consist of 73.03% kaolinite, 22.6% halloysite, 0.77% chlorite, 1.37% quartz and 2.23% christobalite Adsorption experimental indicate that the optimum adsorption took place at pH 7 and contact time for 4 h. Adsorption of GA3 was described by the Langmuir adsorption isotherm model with adsorption capacity of 8.91 mg/g on raw kaolin and 10.38 mg/g on purified kaolin.   Keywords: kaolin, gibberellic acid, adsorption

scholarly journals ISOTERM ADSORPSI FENOL OLEH LEMPUNG ALAM

2019 ◽  
Vol 7 (1) ◽  
pp. 029
Author(s):  
Nelly Wahyuni ◽  
Imelda H. Silalahi ◽  
Dina Angelina
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Freundlich Isotherm ◽  
Langmuir Adsorption Isotherm ◽  
Batch Experiments ◽  
Natural Clay ◽  
Langmuir Adsorption ◽  
Equilibrium Data ◽  
Initial Phenol Concentration

Abstrak Fenol merupakan polutan yang sangat berbahaya di lingkungan karena bersifat racun dan sulit terdegradasi oleh organisme pengurai. Lempung alam yang berasal dari Kecamatan Capkala, Kabupaten Bengkayang  akan dikaji penggunaannya sebagai adsorben fenol. Adsorpsi dilakukan dengan metoda batch pada variasi waktu kontal dan konsentrasi awal fenol. Data kesetimbangan adsorpsi diuji dengan isoterm Langmuir dan Freundlich. Hasil penelitian menunjukkan waktu kontak optimum adsorpsi adalah 4 jam. Proses adsorpsi fenol  oleh lempung alam  mengikuti model isoterm adsorpsi Langmuir dengan kapasitas adsorpsi sebesar 0,65mg/g. Kata Kunci: fenol, Freundlich, isoterm adsorpsi, Langmuir, lempung alamAbstract Phenol is a pollutant that is very dangerous in the environment because it is toxic and difficult to degrade by decomposing organisms. Natural clay from Capkala District, Bengkayang Regency will be studied as phenol adsorbent. Batch experiments were carried out by varying the parameters like contact time of adsorption and initial phenol concentration. The equilibrium data were tested with Langmuir and Freundlich isotherm. The results showed that the optimum contact time for adsorption was 4 hours. The process of adsorption of phenol by natural clay follows the Langmuir adsorption isotherm model with an adsorption capacity of 0.65mg/g.  Keywords: adsorption isotherm, Freundlich, natural clay, phenol, Langmuir.

scholarly journals Aplikasi Zeolit Alam Aktif Wonosari Sebagai Adsorben Zat Warna Remazol Yellow Fg

2021 ◽  
Vol 1 ◽  
pp. 80-87
Author(s):  
Neni Damajanti ◽  
Anwar Ma’ruf ◽  
Hanafi Khafid Nugraha
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Textile Industry ◽  
Contact Time ◽  
Langmuir Adsorption Isotherm ◽  
Isotherm Model ◽  
Isotherm Models ◽  
Activation Process ◽  
Langmuir Adsorption ◽  
Freundlich Adsorption Isotherm

Zeolite as an adsorbent has been widely used. Zeolite activation was carried out to increase the absorption. This study aimed to determine the characteristics of the active zeolite and apply it as an adsorbent. The activation process was carried out by adding acid and calcining at 4500C for 6 hours. Remazol Yellow FG is a dye that is widely used in the textile industry. In this study, the adsorption process was carried out on the Remazol Yellow FG solution, then analyzed the effect of changes in pH (5, 6, 7, 8, 9), contact time (30, 60, 90, 120, 150 minutes) and the concentration of Remazol Yellow FG solution ( 50, 100, 150, 200, 250 ppm) on the adsorption of Remazol Yellow FG dye. From the analysis of the sample solution of Remazol Yellow, the values of Ce and qe can be calculated. These values were then used to calculate KL and KF in the Langmuir adsorption isotherm and Freundlich adsorption isotherm models. From the experimental results, it could be seen that as the contact time increased, the adsorption capacity would be greater. However, when the zeolite was already in the saturated phase, the adsorption capacity would tend to decrease. In the Langmuir adsorption isotherm, the KL value was 0.0274 L/mg and in the Freundlich adsorption isotherm model, the KF value was 29.25 L/mg. Remazol Yellow FG adsorption tended to follow the Langmuir adsorption isotherm model with an R2 value of 0.998.

scholarly journals MODIFIED KAOLIN WITH CATIONIC SURFACTANT FOR GIBBERELLIC ACID CARRIER MATERIALS

2011 ◽  
Vol 11 (1) ◽  
pp. 96-102 ◽  
Author(s):  
Sunardi Sunardi ◽  
Utami Irawati ◽  
Yateman Arryanto ◽  
Sutarno Sutarno
Keyword(s):  
Adsorption Isotherm ◽  
Gibberellic Acid ◽  
Adsorption Capacity ◽  
Cationic Surfactant ◽  
Cetyltrimethylammonium Bromide ◽  
Surface Engineering ◽  
Langmuir Adsorption Isotherm ◽  
Isotherm Model ◽  
Langmuir Adsorption ◽  
Carrier Materials

Synthesis of surfactant modified kaolin from natural kaolin from Tatakan, Tapin, South Kalimantan and its application for carrier material of gibberellic acid have been conducted. The kaolin modification was done by surface engineering using cationic surfactant cetyltrimethylammonium bromide (C16TMABr). The characterizations of kaolin and surfactant modified kaolin were carried out by XRF, SEM, XRD, FTIR and TGA/DTA. The adsorption capacity of kaolin was determined by Langmuir adsorption isotherm model. The result showed that kaolin from Tatakan, South Kalimantan consist of kaolinite, halloysite, quartz, chlorite, and christobalite. Surface modification using cationic surfactant showed that increasing surfactant content onto kaolin was proportional to the amount of surfactant loaded. Gibberellic acid was partitioned into the organic phase created by the surfactant tails of the C16TMA+ modified kaolin. The calculations result by Langmuir adsorption isotherm model showed that the highest increasing adsorption capacity occurred on surfactant modified kaolin with surfactant/CEC ratio of 2.0, with the adsorption capacity of 28.41 mg/g.

scholarly journals ADSORPTION OF GIBBERELLIC ACID (GA3) ONTO ACID ACTIVATED KAOLIN

2010 ◽  
Vol 10 (3) ◽  
pp. 320-326 ◽  
Author(s):  
Sunardi Sunardi ◽  
Yateman Yateman Arryanto ◽  
Sutarno Sutarno
Keyword(s):  
Adsorption Isotherm ◽  
Gibberellic Acid ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Langmuir Adsorption Isotherm ◽  
Isotherm Model ◽  
Adsorption Parameters ◽  
Langmuir Adsorption ◽  
Before And After ◽  
Homogeneous Composition

Preparation, activation and adsorption study of natural kaolin from Tatakan, Tapin, South Kalimantan have been conducted. The activation of kaolin was done using 6 M HCl solutions at 90 °C for 3 h. The characterizations of kaolin were carried out by Fourier Transform Infrared, X-ray diffraction, and surface area analyzer. Adsorption parameters studied included the effect of pH, contact time, and concentration of gibberellic acid (GA3) onto kaolin samples. The amount of gibberellic acid adsorbed was determined using UV spectrophotometer. The adsorption capacity of kaolin was determined by Langmuir adsorption isotherm model. The result showed that activation of kaolin was resulted the larger specific surface area and more homogeneous composition of kaolin without any destruction of kaolin structure. Adsorption of gibberellic acid onto kaolin before and after activation showed that optimal adsorption was obtained at pH » 7 and reached the equilibrium within 4 h. The calculations result by Langmuir adsorption isotherm model showed that the increasing of adsorption capacity of acid activated kaolin is about 35%.

scholarly journals Equilibrium, Kinetics, and Thermodynamic Studies of Malachite Green Adsorption onto Fig (Ficus cartia) Leaves

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Yemane Tadesse Gebreslassie
Keyword(s):  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Malachite Green ◽  
Contact Time ◽  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Experimental Result ◽  
Solution Temperature ◽  
Batch Adsorption ◽  
Langmuir Adsorption

The release of dyes from dying industries such as leather, paper, and textiles is an important cause of environmental pollution. In the present study, the batch adsorption measurements were carried out using stimulated aqueous solutions and the effect of operating variables such as initial malachite green concentration, amount of adsorbent, solution pH, contact time, and solution temperature, were investigated. The experimental result showed that the percentage removal decreased with an increase in initial dye concentration but increased as pH of the solution, contact time, and adsorbent dose increased. The equilibrium data were analyzed using Langmuir adsorption isotherm, Freundlich adsorption isotherm, and Tempkin isotherm models, and it was observed that the Langmuir adsorption isotherm better described the adsorption process. The monolayer adsorption capacity of activated carbon prepared from fig leaves for malachite green adsorption was found to be 51.79 mg/g at 298 K. Furthermore, the adsorption kinetics of the dye was investigated, and the rate of adsorption was found to follow the pseudo-first-order kinetic model with intraparticle diffusion as one of the rate-determining steps. The negative value of ΔG0 and the positive values of ΔH0 indicate the spontaneous and endothermic nature of the adsorption process, respectively. The experimental result obtained in the present study and comparison with other reported adsorbents indicate that activated carbon prepared from fig leaves could be used as a low-cost alternative adsorbent for the removal of malachite green from aqueous solution.

scholarly journals Malachite Green Removal by Zn/Al-citrate LDHs in Aqueous Solution

2020 ◽  
Vol 5 (2) ◽  
pp. 59
Author(s):  
Nurlisa Hidayati ◽  
Risfidian Mohadi ◽  
Elfita Elfita ◽  
Aldes Lesbani
Keyword(s):  
Aqueous Solution ◽  
Malachite Green ◽  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Precipitation Method ◽  
Chemical Adsorption ◽  
Langmuir Adsorption ◽  
Batch System ◽  
Isotherm Adsorption ◽  
Co Precipitation

Zn/Al-citrate LDHs was synthesized using co precipitation method at basic condition and the material were applied as adsorbent of malachite green (MG) dye in aqueous medium using batch system. Adsorption of MG onto Zn/Al-citrate was investigated through kinetic, isotherm adsorption and thermodynamic studies. Kinetic model was fitted PSO than PFO for MG adsorption. The rate of adsorption 𝑘2 for Zn/Al LDHs was 0.000692 g.mg−1 min−1 and 0.000371 g for Zn/Al-citrate LDHs.mg−1 min−1. Adsorption of malachite green onto Zn/Al LDHs and Zn/Al citrate LDHs was investigated and following Langmuir adsorption isotherm model shows chemical adsorption process. The adsorption capacity maximum of Zn/Al-citrate is 333 mg/g from Zn/Al LDHs is only 111 mg/g. Thermodynamic parameters of Zn/Al-citrate confirmed adsorption process was endothermic and spontaneous.

Synthesis and Adsorption Properties for Ag(I) of Pyridinedicanbnyl Thiourea Resin

2012 ◽  
Vol 581-582 ◽  
pp. 180-184 ◽  
Author(s):  
Zhong Nan Wang ◽  
Hong Zhong ◽  
Shuai Wang
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Langmuir Adsorption Isotherm ◽  
Adsorption Properties ◽  
Chelating Resin ◽  
Batch Operation ◽  
Langmuir Adsorption ◽  
Ft Ir ◽  
Equilibrium Adsorption Capacity

A novel pyridinedicanbnyl thiourea chelating resin(PTR) was synthesized from pyridinedicanbnyl diisothiocyanate and diethylene triarmine , its structure was confirmed by FT-IR. The adsorption properties of PTR for Ag(I) were investigated by batch operation . The results show that the adsorption equilibrium of PTR for Ag(I) is achieved after 14 hour at 25°C, the equilibrium adsorption capacity is 4.73mmol/g, the adsorption process accords with G. E. Boyd equation and Langmuir adsorption isotherm as well,and the silver-loaded resins can be quantitatively eluted by a solution containing 6% thiourea in 1mol/L HNO3.

scholarly journals ADSORPSI DAN DESORPSI Cr(VI) PADA ADSORBEN BATU CADAS KARANGASEM HASIL LIMBAH KERAJINAN CANDI BALI TERAKTIVASI NaOH DAN TERSALUT Fe(OH)3

Jurnal Kimia ◽  
2016 ◽  
Author(s):  
I Made Dupi Andika ◽  
I Nengah Simpen ◽  
Ketut Gede Dharma Putra
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Acid Site ◽  
Surface Acidity ◽  
Langmuir Adsorption Isotherm ◽  
Coating Process ◽  
Equilibrium Time ◽  
Langmuir Adsorption ◽  
Adsorption Desorption

This research discusses the adsorption-desorption of Cr(VI) by the adsorbent made from Karangasem cadas rock which is the waste of Balinese temple production. The adsorbent was activated with  NaOH and coated with Fe(OH)3. The aim of the study was to investigate the capability of cadas rock in Cr6+ adsorption. The rock was activated with various concentrations of NaOH followed by coating process with Fe(OH)3. Each adsorbent was characterized for its specific surface area and surface acidity. The equilibrium time, adsorption isotherms and adsorption capacity were also investigated. The adsorbent with the highest adsorption capacity was then desorbed using HNO3 2 mol/L, NaOH 1 mol/L, and saturated NH4Cl. The result suggested that the highest surface acidity was showed by the control adsorbent which was 0.2836 ± 0.0106 mmol/g with an acid site of 1.7079 x 1020 atoms/g. The highest spesific surface area was showed by the adsorbent activated with 6M NaOH  and coated with Fe(OH)3, which was 34.5042 m2/g. The highest adsorption capacity was showed by the same adsorbent, which was 2.5253 mg/g with interaction time of 15 minutes at pH 5. This met the pattern of Langmuir adsorption isotherm. HNO3 was the most effective desorption substance resulted in a percentage of Cr desorbed of 2,15%.

Preparation and characterization of a new sawdust/MNP/PEI nanocomposite and its applications for removing Pb (II) ions from aqueous solution

2018 ◽  
Vol 78 (12) ◽  
pp. 2469-2480
Author(s):  
Avat Ghasemi ◽  
Mahmoud Reza Sohrabi ◽  
Fereshteh Motiee
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Adsorption Process ◽  
Aqueous Media ◽  
X Ray Diffraction ◽  
Phase Contact Time ◽  
X Ray ◽  
Langmuir Adsorption ◽  
Ft Ir

Abstract A new sawdust/magnetite nanoparticles/polyethyleneimine (SD/MNP/PEI) nanocomposite was synthesized by grafting polyethyleneimine (PEI) to magnetic sawdust. Features of SD/MNP/PEI were characterized using Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and scanning electron microscopy (SEM). SD/MNP/PEI was used as an adsorbent for the removal of lead (Pb (II)) from aqueous solution. The effects of independent variables including pH of solution, adsorbent dose and contact time were performed and adsorption isotherms were obtained. Experimental results show that priority effective variables were pH and the amount of nanocomposite, and it was found that the sorption capacity increases with the increasing phase contact time. The adsorption process followed the Langmuir adsorption isotherm. Although SD and SD/MNP do not show a high affinity for the adsorption of Pb (II) in aqueous media, polyethyleneimine cross-linked on SD/MNP showed 40 and 66% increases, respectively, in the adsorption of Pb (II) compared to the SD and SD/MNP. It was found that SD/MNP/PEI removes more efficiently lead ions from aqueous solutions than the SD, SD/MNP. Desorption of the lead from the SD/MNP/PEI was conducted. It was proved that SD/MNP/PEI has excellent properties and can be used as a sorbent of multi-use.

Research on Oily Sludge Pyrolysis Residue to the Adsorption of Biologically Treated Oil-Field Wastewater

2011 ◽  
Vol 393-395 ◽  
pp. 1398-1404
Author(s):  
Yu Shuang Wang ◽  
Chun Xu Wu ◽  
Hong Tao Zhang ◽  
Zhao Lin Chen ◽  
Guo Qing Yuan ◽  
...  
Keyword(s):  
Adsorption Isotherm ◽  
Synergistic Effect ◽  
Adsorption Capacity ◽  
Adsorption Equilibrium ◽  
Langmuir Adsorption Isotherm ◽  
Oil Field ◽  
Oily Sludge ◽  
Equilibrium Time ◽  
Langmuir Adsorption ◽  
Pyrolysis Residue

Economical and effective oily sludge pyrolysis residue was prepared, characterized with various techniques, and applied in the removal of COD in biologically treated oil-field wastewater. It was found that surface area of oily sludge pyrolysis residue was 223.62 m2 /g. The content of C and Al2O3 was 27.91% and 27.6%, respectively. Oily sludge pyrolysis residue contains carboxyl, hydroxyl, carbonyl and other oxygen-containing acid functional groups. When the adsorption equilibrium time of oily sludge pyrolysis residue was 90min, pH of solution was 4, the best COD adsorption capacity was 59.5 mg/g. Adsorption of oily sludge pyrolysis residue is determined by its structure and composition. The Al2O3 may play a flocculation and sedimentation role in COD removal, which has a synergistic effect on adsorption. The adsorption of COD from biologically treated oil-field wastewater by oily sludge pyrolysis residue follows Langmuir adsorption isotherm.

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