Kinerja Aktivasi dan Impregnasi Fly Ash sebagai Adsorben Fenol

The purpose of this study was to determine the response and performance of fly ash as an adsorbent activated by HCl and impregnated with FeCl3 to absorb phenol. In this study, the fly ash activation process was carried out using 8 M HCl for 2 hours and impregnated with 2% FeCl3 for 2 hours. Activated and impregnated fly ash was analyzed using a Scanning Electron Microscope-Energy Dispersive Spectrophotometer (SEM-EDX). The results of the activated and impregnated fly ash surface using SEM-EDX showed that there were changes in morphology and functional groups. Then activated and impregnated fly ash was used to absorb phenol at a time variation of 60 minutes, 120 minutes, 180 minutes, 240 minutes and 300 minutes. At 180 minutes of contact time, the equilibrium point is obtained with an absorption efficiency of 90.5%. Second-order pseudo kinetics were used for phenol adsorption by Fe+ impregnated fly ash (R2 = 0.9916). The isotherm models used in the phenol adsorption process by fly ash impregnated with Fe+ are Langmuir Isotherm (R2 = 0.9927) and Freundlich Isotherm (R2 = 0.9984), which means that the adsorption process occurs in multi-layer and mono-layers.

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Removal of lead from aqueous solutions by low cost and waste biosorbents (lemon, bean and artichoke shells)

Water Science & Technology ◽

10.2166/wst.2020.093 ◽

2020 ◽

Vol 81 (1) ◽

pp. 159-169

Author(s):

Feyza Ergüvenerler ◽

Şerif Targan ◽

Vedia Nüket Tirtom

Keyword(s):

Contact Time ◽

Adsorption Process ◽

Low Cost ◽

Standard Free Energy ◽

Freundlich Isotherm ◽

Standard Entropy ◽

X Ray ◽

Adsorption Capacities ◽

Influence Of Ph ◽

Scanning Electron

Abstract Simple, fast, effective, low cost and waste biosorbents, lemon, bean and artichoke shells, were used to remove lead (II) ions from aqueous solution. The influence of pH, contact time, temperature and lead (II) concentration of the removal process was investigated. The sufficient contact time was deemed 10 minutes for bean and artichoke shells and 60 minutes for lemon shells for Pb(II) ions. The thermodynamic parameters, such as standard free energy (ΔG), standard enthalpy (ΔH), and standard entropy (ΔS) of the adsorption process were calculated as −5.6786, −5.5758, −3.1488 kJmol−1 for ΔG, −7.2791, −20.285, −9.5561 kJ mol−1 for ΔH, −0.00545, −0.05017, −0.02185 kJ mol−1 K−1 for ΔS, respectively, for lemon, artichoke and bean shells. Maximum adsorption capacities of lead (II) were observed as 61.30 mg g−1, 88.5 mg g−1 and 62.81 mg g−1, respectively, for lemon, bean and artichoke shells according to the Freundlich isotherm model at 20 °C. Scanning electron microscope (SEM) and energy-dispersive X-ray detector (EDX) were used to characterize the surface morphology of the adsorbents. Consequently, Pb(II) removal using lemon, bean and artichoke shells would be an effective method for the economic treatment of wastewater.

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KESETIMBANGAN PROSES DESORPSI AMONIA DARI ARANG AKTIF HASIL PIROLISIS LIMBAH BIOMASSA

AL ULUM JURNAL SAINS DAN TEKNOLOGI ◽

10.31602/ajst.v5i2.2803 ◽

2020 ◽

Vol 5 (2) ◽

pp. 48

Author(s):

Hasni Hasni ◽

Syamsuddin Yani ◽

Andi Aladin ◽

Mimin Septiani

Keyword(s):

Active Carbon ◽

Equilibrium Model ◽

Contact Time ◽

Adsorption Process ◽

Freundlich Isotherm ◽

Langmuir Equation ◽

Isotherm Models ◽

Desorption Process ◽

Ammonia Desorption ◽

Carbon Mass

Ammonia which is bound to the adsorbent can interfere adsorption process, so that release the compound can be done by desorption process. This research intends to know appropriate equilibrium models to determine maximum capacity of active carbon for desorption ammonia. The method which used in desorption process are Langmuir and Freundlich isotherm models. The research was performed with variation of active carbon mass and variation of contact time. The concentration of ammonia on the desorption process was determined using spectrophotometer at λ 420 nm. The experiment result showed that the more the active carbon dosage is used, the more the concentration of ammonia is increased. Optimum contact time during 7 hours with desorption percentage 94-96%. This research of ammonia desorption by active carbon followed the Langmuir equilibrium model R2 0.954 and Freundlich equilibrium model R2 0.952. The equilibrium equation is used Langmuir equation y = -0.015x + 3.185, maximum desorption capacity is 66.67 mg/g.

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Removal of phenol from aqueous solution by adsorption

Canadian Journal of Civil Engineering ◽

10.1139/l06-018 ◽

2006 ◽

Vol 33 (5) ◽

pp. 546-551 ◽

Cited By ~ 14

Author(s):

Jadwiga Kaleta

Keyword(s):

Activated Carbon ◽

Contact Time ◽

Adsorption Process ◽

Freundlich Isotherm ◽

Breakthrough Curves ◽

Adsorptive Capacity ◽

Phenol Adsorption ◽

Through Flow ◽

Adsorption Processes ◽

Static Conditions

The paper presents the results of laboratory tests concerning the possibility of utilizing activated carbon produced in Poland and nonconventional adsorbents, such as modified Clarion clay and clinoptylolite, for removing organic phenol from water. The effect of contact time and pH of the model solution on the adsorption process was assessed during tests conducted under static conditions. A contact time of 30 min was considered as optimum, and the highest efficiency of the adsorption process was achieved using a pH of 7.0. Adsorbent doses affected the course and effectiveness of the adsorption process. The adsorption processes were best described by the Freundlich isotherm. On the basis of the isotherms, the adsorptive capacity of tested adsorbents was calculated. Activated carbon had an adsorptive capacity of 13.22 g/kg, modified Clarion clay 1.24 g/kg, and clinoptylolite 0.23 g/kg. The through-flow conditions were achieved by column filtration. On the basis of breakthrough curves, the adsorptive capacities were higher than those determined through static conditions, namely 61.23, 23.56, and 2.99 g/kg for activated carbon, modified Clarion clay, and clinoptylolite, respectively. Despite their inferior adsorptive characteristics, the modified Clarion clay and clinoptylolite may be applied in filtration systems prior to filters with activated carbon.Key words: phenol, adsorption process, activated carbon, modified clay, clinoptylolite.

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Phenol adsorption from wastewater using cashew nut shells as adsorbent

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.9771 ◽

2018 ◽

Vol 7 (3) ◽

pp. 966

Author(s):

Kartik Kulkarni ◽

Varsha Sudheer ◽

C R Girish

Keyword(s):

Agricultural Waste ◽

Freundlich Isotherm ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Multilayer Adsorption ◽

Phenol Adsorption ◽

Cashew Nut ◽

Experimental Parameters ◽

Order Kinetic Model

The potential of agricultural waste cashew nut shells as an adsorbent for removing phenol from wastewater is presented in this paper. The adsorbent was treated with 3M sulphuric acid in order to improve the properties. The experimental parameters such as adsorbent dosage, concentration and temperature were optimized with response surface methodology (RSM). The isotherm data were tested with different isotherm models and it obeyed Freundlich Isotherm showing the multilayer adsorption. The kinetic data satisfied pseudo-first order kinetic model. The maximum adsorption capacity was calculated to be 35.08 mg/g proving the capability of cashew nut shells for removing phenol from wastewater.

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Zero-Cost Agricultural Wastes as Sources for Activated Carbons Synthesis: Lead Ions Removal from Wastewaters

Proceedings ◽

10.3390/proceedings2110652 ◽

2018 ◽

Vol 2 (11) ◽

pp. 652 ◽

Cited By ~ 3

Author(s):

George Z. Kyzas ◽

Athanasios C. Mitropoulos

Keyword(s):

Activated Carbons ◽

Freundlich Isotherm ◽

Lead Ions ◽

Isotherm Models ◽

Activation Process ◽

Strong Impact ◽

Equilibrium Data ◽

Preparation Route ◽

Temperature Equilibrium ◽

Gibb’S Free Energy

In the present study, activated carbons (PAC) were hydrothermally prepared with an environmental friendly preparation route after pyrolysis from biomass (specifically from agricultural (potato) peels). The prepared biochars were activated with potassium hydroxide (chemical activities). The preparation route had a strong impact on the pore structure of PAC. In addition, surface chemistry was also affected by the preparation and activation process. The adsorbent materials were also characterized by Scanning Electron Microscopy. The prepared activated carbons were used as adsorbents for the removal of lead ions. Batch experiments were performed to investigate the effect of physico-chemical parameters, such as pH, contact time, initial metal concentration and temperature. Equilibrium data were analyzed using Langmuir and Freundlich isotherm models. The thermodynamic parameters such as the change of enthalpy (ΔH0), entropy (ΔS0) and Gibb’s free energy (ΔG0) of adsorption systems were also determined and evaluated.

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Investigation of competitive adsorption and desorption of heavy metals from aqueous solution using raw rock: Characterization kinetic, isotherm, and thermodynamic

MATEC Web of Conferences ◽

10.1051/matecconf/202134801016 ◽

2021 ◽

Vol 348 ◽

pp. 01016

Author(s):

Rajaa Bassam ◽

Marouane El Alouani ◽

Nabila Jarmouni ◽

Jabrane Maissara ◽

Mohammed El Mahi Chbihi ◽

...

Keyword(s):

Heavy Metals ◽

Adsorption Process ◽

Freundlich Isotherm ◽

Langmuir Model ◽

Second Order ◽

Isotherm Models ◽

Desorption Process ◽

Pseudo Second Order ◽

Rock Characterization ◽

Metals Adsorption

Heavy metals are the most dangerous inorganic pollutants Due to their bioaccumulation and their nonbiodegradability, for this, several studies have focused on the recovery of these metals from water using different techniques. In this context, our study consists of evaluating an efficient and eco-friendly pathway of competitive recovery of heavy metals (Cd, Cr and As) from aqueous solutions by adsorption using raw rock. This adsorbent was characterized before and after the adsorption process by several techniques. The multi-metals adsorption process in the batch mode was undertaken to evaluate the effect of adsorbent mass, contact time, pH, Temperature, and initial heavy metals concentration. The kinetic data were analyzed using the pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetic models. According to the modeling of the experimental results, the adsorption kinetics of heavy metals were adapted to the pseudo-second-order model. The adsorption isotherms were evaluated by the Langmuir and Freundlich isotherm models. The experimental isotherm data of heavy metals were better fitted with the Langmuir model rather than Freundlich isotherm models. The maximum experimental adsorption capacities (Qmax) predicted by the Langmuir model are 15.23 mg/g for Cd (II), 17.54 mg/g for Cr (VI) and 16.36 mg/g for As (III). The values of thermodynamic parameters revealed that the heavy metals adsorption was exothermic, favorable, and spontaneous in nature. The desorption process of heavy metals showed that this raw rock had excellent recycling capacity. Based on the results, these untreated clays can be used as inexpensive and environmentally friendly adsorbents to treat water contaminated by heavy metals.

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ADSORPTION AND KINETIC STUDIES OF A NATURAL DYE FROM CURCUMA LONGA L., ONTO BAMBOO YARN

Journal of Chemical Engineering and Industrial Biotechnology ◽

10.15282/jceib.v2i1.3802 ◽

2017 ◽

Vol 2 (1) ◽

pp. 13-26

Author(s):

Tengku Khamanur Azma Tg. Mohd Zamri ◽

Mimi Sakinah Abd Munaim ◽

Zularisam Ab Wahid

Keyword(s):

Adsorption Process ◽

Regression Coefficient ◽

Curcuma Longa ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Natural Dye ◽

Isotherm Models ◽

Order Model ◽

Dyeing Process ◽

Pseudo Second Order

Natural dye extracted from the rhizome of Curcuma longa L. were applied to bamboo yarns using exhaustion dyeing process. This study investigates the dyeing behaviour of Curcumin; the major color component isolated from rhizomes of Curcuma longa L.on bamboo yarn. Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich isotherm models were used to test the adsorption process of curcumin on bamboo yarn. Comparison of regression coefficient value indicated that the Freundlich isotherm most fitted to the adsorption of curcumin onto bamboo yarn. Furthermore, the kinetics study on this research fitted the pseudo-second order model which indicates that the basis of interaction was chemical adsorption.

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Modified/Unmodified Nanoparticle Adsorbents of Cellulose Origin With High Adsorptive Potential for Removal of Pb(II) From Aqueous Solution

European Scientific Journal ESJ ◽

10.19044/esj.2017.v13n27p425 ◽

2017 ◽

Vol 13 (27) ◽

pp. 425

Author(s):

Azeh Yakubu ◽

Gabriel Ademola Olatunji ◽

Folahan Amoo Adekola

Keyword(s):

Aqueous Solution ◽

Adsorption Capacity ◽

Contact Time ◽

Adsorption Process ◽

Correlation Coefficients ◽

Solution Temperature ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Kinetics Of Adsorption ◽

Kinetics Of

This investigation was conducted to evaluate the adsorption capacity of nanoparticles of cellulose origin. Nanoparticles were synthesized by acid hydrolysis of microcrystalline cellulose/cellulose acetate using 64% H3PO4 and characterized using FTIR, XRD, TGA-DTGA, BET and SEM analysis. Adsorption kinetics of Pb (II) ions in aqueous solution was investigated and the effect of initial concentration, pH, time, adsorbent dosage and solution temperature. The results showed that adsorption increased with increasing concentration with removal efficiencies of 60% and 92.99% for Azeh2 and Azeh10 respectively for initial lead concentration of 3 mg/g. The effects of contact time showed that adsorption maximum was attained within 24h of contact time. The maximum adsorption capacity and removal efficiency were achieved at pH6. Small dose of adsorbent had better performance. The kinetics of adsorption was best described by the pseudo-second-Order model while the adsorption mechanism was chemisorption and pore diffusion based on intra-particle diffusion model. The isotherm model was Freundlich. Though, all tested isotherm models relatively showed good correlation coefficients ranging from 0.969-1.000. The adsorption process was exothermic for Azeh-TDI, with a negative value of -12.812 X 103 KJ/mol. This indicates that the adsorption process for Pb by Azeh-TDI was spontaneous. Adsorption by Azeh2 was endothermic in nature.

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STUDI ADSORPSI ZAT WARNA NAPHTHOL YELLOW S PADA LIMBAH CAIR MENGGUNAKAN KARBON AKTIF DARI AMPAS TEBU

Jurnal Kimia ◽

10.24843/jchem.2019.v13.i01.p16 ◽

2019 ◽

Vol 13 (1) ◽

pp. 104

Author(s):

W. P. Utoo1 ◽

E. Santoso ◽

G. Yuhaneka ◽

A. I. Triantini ◽

M. R. Fatqi ◽

...

Keyword(s):

Activated Carbon ◽

Adsorption Capacity ◽

Surface Area ◽

Contact Time ◽

Adsorption Process ◽

Activation Process ◽

Adsorption Model ◽

High Adsorption ◽

Prolonged Contact ◽

Test Result

The aim of this research is to get activated carbon from sugarcane bagasse with high adsorption capacity to Naphthol Yellow S and to know factors influencing the adsorption capacity. Activated carbon is prepared by incomplete combustion of sugracane bagasse. The resulting carbon is activated with H2SO4 with concentration variation of 0.5; 1.0; 1.5 and 2.0 M and is continued by calcination at 400 °C. The measurement of the surface area of ??activated carbon by the methylene blue method indicates that the activation process successfully extends the surface area of carbon from 31.87 m2/g before activation to 66-72 m2/g after activation. Activated carbon with concentration of 2.0 M H2SO4 showed the highest surface area of ??71.85 m2/g, however, the best adsorption was shown by activated carbon with a concentration of 0.5 M H2SO4 with the adsorption capacity of 83.93%. The adsorption test showed that the best amount of adsorbent was 0.2 g with contact time for 30 minutes. Prolonged contact time can decrease the amount of Naphthol Yellow S adsorbed. The best adsorption test result was shown by sample with activator concentration of 0,5 M, mass of 0,2 g and contact time of 30 min with adsorption capacity 95,81% or amount of dye adsorbed equal to 143,72 mg/g. The adsorption study also showed that the entire Naphthol Yellow S adsorption process followed the Langmuir isothemal adsorption model. Qualitative testing of real batik waste indicates that activated carbon can reduce the dyes waste containing Naphthol Yellow Sexhibited by the color of batik waste which is more faded.

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Optimization, equilibrium and kinetic studies of Zn2+ and Ni2+ adsorption from aqueous solutions using composite adsorbent

Journal of Water Supply Research and Technology—AQUA ◽

10.2166/aqua.2018.150 ◽

2018 ◽

Vol 67 (3) ◽

pp. 279-290 ◽

Cited By ~ 4

Author(s):

Haider M. Zwain ◽

Mohammadtaghi Vakili ◽

Irvan Dahlan

Keyword(s):

Contact Time ◽

Coal Fly Ash ◽

Sol Gel ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Isotherm Models ◽

Experimental Conditions ◽

Palm Oil Fuel Ash ◽

Composite Adsorbent ◽

Oil Fuel

Abstract A novel RHA/PFA/CFA composite adsorbent was synthesized from rice husk ash (RHA), palm oil fuel ash (PFA), and coal fly ash (CFA) by modified sol-gel method. Effect of different parameters such as adsorbent dosage, contact time, and pH were studied using batch experiment to optimize the maximum zinc (Zn2+) and nickel (Ni2) adsorption conditions. Results showed that the maximum adsorption condition occurred at adsorbent amount of 10 g/L, contact time of 60 min, and pH 7. At this condition, the removal efficiencies were 81% and 61% for Zn2+ and Ni2+, in which the adsorption capacities (qmax) were 21.74 mg/g and 17.85 mg/g, respectively. Adsorption behavior of RHA/PFA/CFA composite adsorbent was studied through the various isotherm models at different adsorbent amounts. The results indicated that the Freundlich isotherm model gave an excellent agreement with the experimental conditions. Based on the results obtained from the kinetic studies, pseudo-second-order was suitable for the adsorption of Ni2+ and Zn2+, compared to the pseudo-first-order model. The results presented in this study showed that RHA/PFA/CFA composite adsorbent successfully adsorbed Zn2+ and Ni2.

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