scholarly journals Chromium (VI) removal from aqueous solutions using Eichhornia as an adsorbent

2016 ◽  
Vol 7 (4) ◽  
pp. 461-467 ◽  
Author(s):  
Neetu Rani ◽  
Bhupender Singh ◽  
Tuisem Shimrah
Keyword(s):  
Contact Time ◽  
Industrial Wastewater ◽  
Eichhornia Crassipes ◽  
Room Temperature ◽  
Adsorption Process ◽  
Batch Process ◽  
Optimum Dose ◽  
First Order ◽  
Chromium Vi ◽  
Optimum Ph

The study was carried out to check the potential of water hyacinth, Eichhornia crassipes, to remove chromium (VI) in batch process. Powder was prepared from dried Eichhornia (particle size 0.3 mm and 1.0 mm). The influence of various parameters on adsorption (pH, dose, contact time, temperature) was studied. The Cr(VI) removal was 60.9% and 79.2% for 1.00 mm and 0.3 mm particles of Eichhornia treated (ET) after 30 min contact time and 52.7% and 53.4% for 1.00 mm and 0.3 mm particles of Eichhornia untreated (EU) after 75 min contact time respectively. The optimum pH for both adsorbents was found to be 2.0 and optimum dose was found to be 0.4 g 100 ml−1 for ET and 0.6 g 100 ml−1 for EU. Maximum adsorption occurred at room temperature (26 ± 1°C) in case of both ET and EU, respectively. The adsorption process followed the first order mechanism as well as the Langmuir isotherm. Finally, it was concluded that the adsorbent prepared from Eichhornia is very effective in removing Cr(VI) and it can be used for industrial wastewater treatment.

Bentonite-Biochar Combination for Manganese Ion Removal from Water

2021 ◽  
Vol 1162 ◽  
pp. 81-86
Author(s):  
Yasdi Yasdi ◽  
Rinaldi Rinaldi ◽  
Wahyu Fajar Winata ◽  
Febri Juita Anggraini ◽  
Ika Yanti ◽  
...  
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Room Temperature ◽  
Adsorption Process ◽  
Quality Standard ◽  
Ion Concentration ◽  
Optimum Conditions ◽  
Manganese Ion ◽  
Ion Removal ◽  
Optimum Ph

Peat waters were abundant in the West Tanjung Jabung Regency of Jambi Province. Peat water contains manganese metal ion concentration that exceeds the clean water quality standard. Previous studies have been conducted to reduce levels of manganese in peat water, but the results have not been significant. This study aims to reduce levels of Manganese metal in peat water using the composition of Bentonite and Biochar. The adsorption process was carried out at room temperature (29 °C) with a stirring of 200 rpm. Some parameters measured were optimum pH of adsorption, optimum contact time and the best combination between Bentonite and Biochar. Manganese ion concentration in solution was measured using atomic absorption spectroscopy (AAS). The results of this study indicate that the optimum conditions for removing manganese ion at pH 5 and contact time 40 minutes. Tests on artificial solutions using 0.2 grams of biochar showed Mn ion removal of 42.91% (C0 = 100 mg/L, Ce = 57.09 mg/L, V = 100 mL). The best combination obtained in Bentonite: Biochar (1:2) with a mass of 0.080 gr and 0.170 gr, respectively, which able to remove 91.29% manganese ions in peat water.

scholarly journals Batch studies of phosphonate adsorption on granular ferric hydroxides

2020 ◽  
Vol 81 (1) ◽  
pp. 10-20 ◽  
Author(s):  
T. Reinhardt ◽  
M. Gómez Elordi ◽  
R. Minke ◽  
H. Schönberger ◽  
E. Rott
Keyword(s):  
Contact Time ◽  
Room Temperature ◽  
Adsorption Process ◽  
Ferric Hydroxide ◽  
Batch Experiments ◽  
Batch Studies ◽  
Influence Of Temperature ◽  
Ph Values ◽  
Adsorption Desorption ◽  
Granular Ferric Hydroxide

Abstract Phosphonates are widely used in various industries. It is desirable to remove them before discharging phosphonate-containing wastewater. This study describes a large number of batch experiments with adsorbents that are likely suitable for the removal of phosphonates. For this, adsorption isotherms for four different granular ferric hydroxide (GFH) adsorbents were determined at different pH values in order to identify the best performing material. Additionally, the influence of temperature was studied for this GFH. A maximum loading for nitrilotrimethylphosphonic acid (NTMP) was found to be ∼12 mg P/g with an initial concentration of 1 mg/L NTMP-P and a contact time of 7 days at room temperature. Then, the adsorption of six different phosphonates was investigated as a function of pH. It was shown that GFH could be used to remove all investigated phosphonates from water and, with an increasing pH, the adsorption capacity decreased for all six phosphonates. Finally, five adsorption–desorption cycles were carried out to check the suitability of the material for multiple re-use. Even after five cycles, the adsorption process still performed well.

Adsorption of Copper Ions from Wastewater by Carboxymethylcellulose Sulfate

2011 ◽  
Vol 393-395 ◽  
pp. 1098-1101 ◽  
Author(s):  
Yan Yu ◽  
Feng Yuan Huang
Keyword(s):  
Contact Time ◽  
Copper Concentration ◽  
Adsorption Process ◽  
Ph Value ◽  
Copper Ions ◽  
Adsorption Capacities ◽  
Monolayer Adsorption ◽  
Optimum Ph ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model

In the present paper, the ability of carboxymethylcellulose sulfate (CMC-S) for Cu(II) removal was studied. The influence of factors, such as the pH value, the initial copper concentrations, and the contact time, were investigated in detail. Atomic absorption spectrophotometer was applied to determined the concentration of Cu(II). The results showed that the adsorption process was strongly dependent on the pH value and the initial copper concentration. The optimum pH value was in the range of 6-7. The theoretical adsorption capacities for Cu(II) was 127.7 mg/g. The equilibrium data was well fitted to the Langmuir isotherm model at 25°C, which can be explained as a monolayer adsorption.

Adsorption Behavior of Barley Straw Carbon for Chromium (VI) Ion

2008 ◽  
Vol 569 ◽  
pp. 213-216
Author(s):  
Rumi Chand ◽  
Takanori Watari ◽  
Toshio Torikai ◽  
Mitsunori Yada ◽  
Katsutoshi Inoue
Keyword(s):  
Aqueous Solution ◽  
Porous Carbon ◽  
Contact Time ◽  
Barley Straw ◽  
Loading Capacity ◽  
Reduction Mechanism ◽  
Total Chromium ◽  
Chromium Vi ◽  
Optimum Ph ◽  
Effects Of Ph

Porous carbon having surface area of 792 m2g-1 was prepared from barley straw by carbonization at 800 oC at a heating rate of 5 oCmin-1 to test the chromium (VI) adsorption from aqueous solution. The effects of pH, contact time and equilibrium Cr (VI) concentration on the adsorption were studied in detail. The optimum pH for Cr (VI) removal was found to be 2. The adsorption of Cr (VI) was very rapid and equilibrium was reached within 1 h. It was interpreted in terms of adsorption-coupled reduction mechanism. Accompanied by the decrease of Cr (VI) ion, Cr (III) ion was slightly released in the solution. Maximum loading capacity of total chromium was found to be 2.35 molkg-1 at pH 2.

scholarly journals Removal of Fluoride Ion from Water Using locally Produced Adsorbent

2019 ◽  
Vol 4 (12) ◽  
pp. 78-85
Author(s):  
Aboiyaa A. Ekine ◽  
Patience N. Ikenyiri ◽  
O. Hezekiah-Braye
Keyword(s):  
Particle Size ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Intraparticle Diffusion ◽  
Fluoride Ion ◽  
First Order ◽  
Egg Shells ◽  
Pseudo Second Order ◽  
Pseudo First Order

This Research investigated the adsorption capacity of locally prepared adsorbents from Egg shells for the removal of fluoride ion in well water. It evaluated the performance of these adsorbents calcinated at 3000C and modified with 1.0M HNO3 (trioxonitrate (v)) acid. Batch adsorber was used to allow for interaction between adsorbent (grounded Egg shells) with water containing fluoride ion. The batch experiment was performed with particle size of 2.12 contact time (60, 120, 180, 240, 300min), mass dosage (5g, 10g, 15g, 20g) and temperature (250C, 300C, 400C, 500C). The modified adsorbent was characterized to determine the physiochemical properties of grounded Egg shells (GE). Also the chemical composition of the modified adsorbent was analyzed to determine the percentage of calcium element required for the uptake of the fluoride ions in water for calcium as 39.68% for grounded Egg shells (GE). Percentage adsorption increased with increase in contact time, mass dosage and temperature for the adsorbent. The adsorption capacity was also determined which also increased with increase in contact time, temperature but decreased with increase in mass dosage at constant time of 60minutes. The pseudo first-order, pseudo second order and intraparticle diffusion kinetic models were fitted into the experimental results. The results obtained indicated that the pseudo first order and intraparticle diffusion models for the grounded Egg shells (GE) reasonably described the adsorption process very well whereas the pseudo second order model was not suitable for a calcinations temperature of 3000C and particle size of 2.12m. The adsorption isotherms were obtained from equilibrium experiment Performed at temperature of 25, 35, 45 and 550C. The result showed that Langmuir and Freundlich isotherm fitted perfectly the experimental data. However, the negative values of Gibb’s free energy indicated that adsorption was favourable and the positive enthalpy change H0 revealed that adsorption process was endothermic while the positive value of the entropy change signified increased randomness with adsorption.

scholarly journals Removal of hexavalent chromium by chemical modification of 4,4′-((1Z,11Z)-2,5,8,11-tetraazadodeca-1,8-diene-1,11-diyl)diphenol: kinetic and equilibrium modeling

2015 ◽  
Vol 5 (3) ◽  
pp. 312-325
Author(s):  
Aysel Çimen
Keyword(s):  
Metal Ions ◽  
Contact Time ◽  
Industrial Wastewater ◽  
Heavy Metal Ions ◽  
Atomic Absorption Spectrometer ◽  
Equilibrium Modeling ◽  
Chromium Vi ◽  
Adsorption Capacities ◽  
Isotherm Equations ◽  
Surface Modified

This study aimed to synthesize a new resin through immobilization of the 4,4′-((1Z,11Z)-2,5,8,11-tetraazadodeca-1,8-diene-1,11-diyl)diphenol (TRA) onto silica gel modified (Si-CPTS) with 3-chloropropyltrimethoxy silane (CPTS) and its application for the removal of chromium(VI) ions from aqueous solution as well as from industrial wastewater. The same applications were also made for industrial wastewater vapor. The objective purpose of this work was to investigate the influences of concentration, temperature, amount of metal ions, contact time and pH to sorption on the surface modified by TRA (Si-TRA). The newly synthesized Si-TRA is characterized with scanning electron microscope and elemental analysis and Cr(VI) heavy metal ions were used as sorbate. The sorption of Cr(VI) ion was evaluated by using batch methods. The value of adsorption of Cr(VI) ion was detected with an atomic absorption spectrometer. The maximum adsorption capacities and isotherm parameters were calculated from the Langmuir, Freundlich, and Dubinin–Radushkevich isotherm equations. Thermodynamic parameters such as free energy (ΔG°), entropy (ΔS°), and enthalpy (ΔH°) were also calculated from the sorption results. The modified structure used as adsorbent was successfully employed in the removal of Cr(VI) ions from the samples of industrial wastewater.

scholarly journals Adsorption of Chromium(VI) on Radiation Grafted N,N-dimethylaminoethylmethacrylate onto Polypropylene, from Aqueous Solutions

2017 ◽  
Vol 57 (2) ◽  
Author(s):  
Guillermina Burillo ◽  
Juan Serrano-Gómez ◽  
Juan Bonifacio-Martínez
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Adsorption Process ◽  
Maximum Adsorption Capacity ◽  
Ion Adsorption ◽  
Initial Concentration ◽  
Chromium Vi ◽  
Adsorption Data ◽  
Initial Ph ◽  
Chromium Adsorption

Polypropylene (PP) grafted with dimethylaminoethylmethacrylate (DMAEMA), was prepared by irradiation with a <sup>60</sup>Co γ source. The obtained PP-<em>g</em>-DMAEMA was used to study the Cr(VI) ion adsorption as a function of contact time, initial pH, initial concentration of metal ion and temperature. Chromium adsorption data on PP-<em>g</em>-DMAEMA at various initial concentration fit well the Freundlich and Langmuir isotherms. The maximum adsorption capacity (a<sub>max</sub>) was found to be 0.3103 × 0<sup>-4</sup> mol g<sup>-1</sup>. The thermodynamic parameters ΔH<sup>0</sup>, ΔG<sup>0</sup> and ΔS<sup>0</sup> were estimated showing the adsorption process to be exothermic and spontaneous.

scholarly journals Optimized Sorption of Methyl Orange using Functionalized Carob Plant Pod

2020 ◽  
Vol 45 (6) ◽  
Author(s):  
K. A. ABDULSALAM ◽  
B. H. Amodu ◽  
O. K. Fakorede ◽  
J. M. Adelowo ◽  
A. P. Onifade ◽  
...  
Keyword(s):  
Contact Time ◽  
Industrial Wastewater ◽  
Adsorption Process ◽  
Dye Adsorption ◽  
Operational Parameters ◽  
Colour Removal ◽  
Adsorbent Dosage ◽  
Percentage Removal ◽  
Central Composite ◽  
Maximum Decolorization

One of the most problematic groups of water pollutants is dye, a main constituent of textile industrial wastewater, which is carcinogenic. Therefore, this research delved into adsorption of dyes from textiles and wastewater using acid-treated as an adsorbent. The adsorbent was prepared by functionalizing the pod of carob with concentrated H3PO4. The effects of operational parameters such as adsorbent dosage, contact time, initial concentration of dye and temperature were studied and optimized using central composite design of design of experiment (DOE). The effects of process parameters (contact time, concentration, adsorbent dosage and temperature) on the dye adsorption were determined and optimized. It was observed that the colour removal efficiency increased with an increase in adsorbent mass and contact time. The adsorption process is endothermic as the percentage removal increases with temperature. The optimum contact time, concentration, adsorbent dosage and temperature were found to be 60oC, 9.74hr, 10ppm, and 5g respectively for the maximum decolorization.

scholarly journals OPTIMASI PENURUNAN NILAI BOD, COD DAN TSS LIMBAH CAIR INDUSTRI TAPIOKA MENGGUNAKAN ARANG AKTIF DARI AMPAS KOPI

Molekul ◽  
2010 ◽  
Vol 5 (1) ◽  
pp. 22 ◽  
Author(s):  
Irmanto Irmanto ◽  
Suyata Suyata
Keyword(s):  
Activated Carbon ◽  
Water Content ◽  
Contact Time ◽  
Industrial Wastewater ◽  
Gravimetric Method ◽  
Cod Removal ◽  
Muffle Furnace ◽  
Optimum Ph ◽  
Winkler Method

Activated carbon from coffee dregs for TSS, BOD and COD removal of tapioca industrial wastewater has been developed. The research aimed to know the quality of activated carbon from dregs of coffee as adsorbent, consist of total rendemen, water content, ashes content and iodium adsorption; to know about the optimum contact time and optimum pH from activated carbon on reducing BOD, COD and TSS value from tapioca industrial wastewater and also to know about the decrease percentage of BOD, COD and TSS value using activated carbon from dregs of coffee. Activated carbon from dregs of coffee are activated using HCl 0,1 N and carbonization at 350°C in muffle furnace. Then, activated carbon was contacted with the tapioca industrial wastewater and used on decreasing BOD, COD and TSS value from tapioca industrial wastewater with contact time varieties 0, 10, 30, 60, 90 and 120 minutes and at pH varieties of wastewater 4, 5, 6, 7, 8, 9 and 10. The decreasing of BOD value was measured by Winkler method, decreasing of COD value measured by iodometric method and decreasing of TSS value measured by gravimetric method. The result of the research showed that the activated carbon produced characteristic consist of rendemen 14,55%; water content 3,4%; ashes content 1,88% and iodium adsorption 750,25 mg/g. It is indicated that the activated carbon that is got from dregs of coffee fulfill the criteria required by SNI No. 06-3730-1995. The result of research also showed that the activated carbon from dregs of coffee could be used for reducing the BOD, COD and TSS value in tapioca industrial wastewater at the optimum contact time of 30 minutes and pH 7. The optimum percentage of activated carbon from dregs of coffee in decreasing BOD value of tapioca industrial wastewater are 33,51%; COD value 78,96% and TSS value 61,05%.

scholarly journals Desorption and Re-Adsorption of Procion Red MX-5B Dye on Alumina-Activated Carbon Composite

2018 ◽  
Vol 18 (2) ◽  
pp. 222 ◽  
Author(s):  
Fatma Fatma ◽  
Poedji Loekitowati Hariani ◽  
Fahma Riyanti ◽  
Wiwin Sepriani
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Adsorption Process ◽  
Carbon Composite ◽  
Desorption Process ◽  
Desorption Kinetic ◽  
First Order ◽  
Before And After ◽  
Sem Micrograph ◽  
Pseudo First Order

The alumina-activated carbon has the ability to adsorb and desorb the procion red MX-5B. The research evaluated the influence of desorption agent, contact time, and temperature on desorption process of procion red MX-5B dye with alumina-activated carbon composite and the adsorption capacity of the composite after desorption process. The desorption agents used in desorption process were solution with pH 2−10, H2O2 30 % (v/v), methanol 70% (v/v) and ethanol 70% (v/v). The variation of contact time was in the range from 30 to 270 min and the temperature was set between 30−75 °C. The result concluded that the highest desorption efficiency up to 98.56% was achieved using ethanol 70% (v/v) for 240 min at 45 °C. The desorption kinetic followed the pseudo-first-order with the release constant (kdes) of 6.56 × 10-2 min-1. The SEM micrograph showed there is a more porous surface on the composite after the desorption compared to before the desorption. The EDX analysis indicated that alumina content in the composite was reduced after desorption process. FTIR spectra of the composite before and after desorption process showed a peak of Al−O at 592 and 590 cm-1 which was proved that alumina still exists in the composite after the desorption process. The alumina-activated carbon composite was re-used to adsorb procion red MX-5B dye. After three times of desorption and re-adsorption process, the capacity adsorption was decreased from 12.38 to 7.38 mg/g.

Sign in / Sign up

Export Citation Format

Share Document