scholarly journals Removal of anionic surfactants by sorption onto Aminated Mesoporous Carbon

2013 ◽  
Vol 19 (3) ◽  
pp. 347-357 ◽  
Author(s):  
S.E. Moradi ◽  
J. Khodaveisy ◽  
R. Dashti
Keyword(s):  
Contact Time ◽  
Mesoporous Carbon ◽  
Anionic Surfactants ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Langmuir Model ◽  
Carbon Adsorbents ◽  
Solution Ph ◽  
Batch Mode ◽  
Ft Ir

Direct and indirect releases of large quantities of surfactants to the environment may result in serious health and environmental problems. Therefore, surfactants should be removed from water before release to the environment or delivery for public use. In the present work, the removal of anionic surfactants, benzene sulfonate (BS), p-toluene sulfonate (TS) and 4-octylbenzene sulfonate (OBS) from water by adsorption onto Amino modified mesoporous carbon (AMC) were studied. The AMC surface chemistry and textural properties was characterized by nitrogen adsorption, XRD and FT-IR analyses. Experiments were conducted in batch mode with the variables such as amount of contact time, solution pH, dose of adsorbent and temperature. Finally, the adsorption isotherms of anionic surfactants on mesoporous carbon adsorbents were in agreement with a Langmuir model. AMC has shown higher anionic surfactants adsorption capacity than the untreated mesoporous carbon, which can explain by strong interaction between anionic surfactant and cationic surface of adsorbent.

scholarly journals Removal of Cd(II) from Aquatic System UsingOscillatoriasp. Biosorbent

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Seyed Naser Azizi ◽  
Abasalt Hosseinzadeh Colagar ◽  
Seyede Maryam Hafeziyan
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Biomass Concentration ◽  
Adsorption Properties ◽  
Langmuir Model ◽  
Ion Concentration ◽  
Solution Ph ◽  
Batch Mode ◽  
Freundlich Model ◽  
Biosorption Capacity

Biosorption of Cd(II) ions from aqueous solutions by native and driedOscillatoriasp. Cyanobacterium biomass was investigated in the batch mode. TheOscillatoriasp. was prepared from Molecular and Cell Laboratory of University of Mazandaran and grown in BG-11 medium. A comparison of Cd(II) adsorption properties of dried with nativeOscillatoriasp. biomass was made, the dried one showed a higher biosorption capacity and faster kinetic. The influence of solution pH, contact time, biomass concentration, initial metal ion concentration, and presence of coions using driedOscillatoriasp. biomass as well as pretreatment on the biosorption capacity of the biomass were studied. Various pretreatments ofOscillatoriasp. increased biosorption of Cd(II) at pH 7 in comparison with native biomass. However, heating at 100°C in a water bath showed significant improvement in Cd(II) biosorption capacity. The experimental biosorption data was well fitted to the Freundlich model compared to the Langmuir model, and the amount of Cd(II) removed from solution increased with increasing Cd(II) concentration. In addition, the dried biomass was investigated for Cd(II) removal from the simulated real sample containing about 14 mg/l Cd(II) at pH 7, under the same experimental condition.

Adsorption of Copper(II) on Dithizone-Immobilized Coal Fly Ash

2020 ◽  
Vol 840 ◽  
pp. 48-56
Author(s):  
Violla Bestari Ayu Sabrina Putri ◽  
Dwi Siswanta ◽  
Mudasir Mudasir
Keyword(s):  
Fly Ash ◽  
Contact Time ◽  
Copper Ions ◽  
Coal Fly Ash ◽  
Organic Ligand ◽  
Optimum Conditions ◽  
Batch Mode ◽  
Copper Adsorption ◽  
Pseudo Second Order ◽  
Ft Ir

The adsorption of Cu (II) ions onto selective adsorbent of coal fly ash from Sugar Factory Madukismo, Yogyakarta, Indonesia modified with dithizone has been investigated in batch mode. Some parameters influencing immobilization of dithizone and adsorption of Cu (II) were optimized including an effect of pH, contact time and initial concentration of Cu (II) ions. The FT-IR and XRD analytical results show that the surface of coal fly ash can be modified by immobilization of selective organic ligand towards Cu (II) ions. The optimum conditions for adsorption of Cu (II) are achieved at pH 5, the optimum mass of DICFA and ACFA for copper adsorption were 0.2 g. Kinetics adsorption for copper ions follows pseudo-second-order kinetics with optimum adsorption contact time 60 min for DICFA and ACFA. Isotherms adsorption for Cu ion follow the Langmuir isotherms with chemisorption process and optimum concentration of Cu ion adsorption of 70 mg.L-1 for DICFA and ACFA.

scholarly journals Synthesis of Fe3O4 nanoparticles @Trioctylmethylammonium thiosalicylat (TOMATS) as a new magnetic nanoadsorbent for adsorption of ciprofloxacin in aqueous solution

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ruhollah Kasraei ◽  
Mohammad Malakootian ◽  
Maryam Mohamadi
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Physical Adsorption ◽  
Sorption Kinetics ◽  
Order Model ◽  
Solution Ph ◽  
Langmuir Adsorption ◽  
Ft Ir ◽  
Real Wastewater ◽  
Adsorbent Dose

AbstractThe aim of this research was to investigate ciprofloxacin (CIP) removal efficiency from aqueous solutions by using Fe3O4 nanoparticles @Trioctylmethylammonium thiosalicylat Ionic liquid (Fe3O4 NP@ TOMATS IL) as a new magnetic nanoadsorbent. The adsorbent was characterized by field emission scanning electron microscope-energy dispersive spectroscopy (FESEM-EDS), mapping, Fourier transform infrared spectroscopy (FT-IR), the Brunauer–Emmett–Teller (BET), X-ray powder diffraction (XRD). The effects of solution pH, adsorbent dose, contact time, initial CIP concentration, and temperature on CIP removal were also investigated. In optimal conditions such as pH = 5.6, CIP concentration = 30 mg/L, adsorbent dose = 0.15 g, temperature = 30 °C, contact time = 90 min, the removal efficiency in synthetic and real wastewater were obtained 87 and 73%, respectively. Batch experiments were carried out to study the sorption Kinetics, thermodynamics, and equilibrium isotherms of CIP with magnetic nanoadsorbent. The results show that all of the above factors influence CIP removal. The Langmuir adsorption isotherm fits the adsorption process well, with the pseudo second-order model describing the adsorption kinetics accurately. The thermodynamic parameters indicate that adsorption is mainly physical adsorption. Recycling experiments revealed that the behavior of adsorbent is maintained after recycling for four times.

scholarly journals Utilization of agricultural waste adsorbent for the removal of lead ions from aqueous solutions

2021 ◽  
Vol 61 (4) ◽  
pp. 570-578
Author(s):  
Adeyinka Sikiru Yusuff ◽  
Lekan Taofeek Popoola ◽  
Victor Anochie
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Contact Time ◽  
Heavy Metal Ions ◽  
Agricultural Waste ◽  
Bet Surface Area ◽  
Solution Ph ◽  
Batch Mode ◽  
Onion Skin

In this study, a performance evaluation of an aluminium oxide modified onion skin waste (Al2O3/OSW) for the removal of heavy metal ions (Pb2+ and Cd2+) from aqueous solution was investigated under batch mode adsorption. The surface morphology, elemental composition, functional groups, textural characteristics and surface charge of the as-made Al2O3/OSW adsorbent were examined using SEM, EDX, FTIR, BET surface area and pHpzc techniques, respectively. The effects of initial cations concentration, contact time, adsorbent dosage, and pH on adsorption of Pb2+ and Cd2+ onto Al2O3/OSW were studied. The adsorption data obtained were evaluated by various adsorption isotherm and kinetic models. Results obtained showed that maximum removal percentages of Pb2+ and Cd2+ were 91.23 and 94.10%, respectively, at the optimum Al2O3/OSW dosage of 1.4 g, contact time of 180 min and aqueous solution pH of 6.0. The isotherm and kinetic studies showed a multilayer adsorbate-adsorbent system with the dominance of the chemisorption mechanism. The study concluded that onion skin waste is a viable, cheap and very effective alternative for removing heavy metal ions from water/wastewater.

scholarly journals Efficient Removal of Dyes Using Almond Husk as a Natural Adsorbent

2016 ◽  
Vol 5 (2) ◽  
pp. 57
Author(s):  
Bhanuprakash M. ◽  
Belagali S.L.
Keyword(s):  
Contact Time ◽  
Water Systems ◽  
Langmuir Model ◽  
Human Beings ◽  
Efficient Removal ◽  
Batch Mode ◽  
Major Threat ◽  
Almond Husk ◽  
Soil And Water ◽  
Adsorbent Dose

<div><p><em>Industrialization and urbanization is considered as, one of major threat to pollution of air, soil and water systems. Among these, water pollution is considered as important one. The addition of various pollutants to water resources is considered as major threat for deterioration of water quality and makes it unsuitable for domestic purposes. Out of many water pollutants, dyes are considered as most hazardous for the plants, animals and human beings. So, it is very important to conserve water due to limited availability. In the present study, almond husk was neutraceutical spent used as adsorbent for the removal of dyes from aqueous solutions in batch mode experiments. Parameters like contact time, pH, adsorbent concentration, adsorbent dose were studied. The results show that, almond husk is a very good adsorbent for the removal of dyes from the aqueous medium. The adsorption isotherms like Freudlich and Langmuir model were calculated and found to be favorable.  </em></p></div>

scholarly journals The effect of mesoporous carbon modification by nitrogen on its enrichment efficiency of chromate ion: Comparison between N-doped mesoporous carbon and amino grafted mesoporous carbon

2011 ◽  
Vol 17 (4) ◽  
pp. 505-515 ◽  
Author(s):  
S.E. Moradi ◽  
M.J. Baniamerian
Keyword(s):  
Mesoporous Carbon ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Adsorbent ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Polymerization Reaction ◽  
Water Solvent ◽  
Carbon Modification ◽  
Mesoporous Carbon Adsorbent

In the present work, well ordered, N-doped mesoporous carbon (MCN) sorbent with uniform mesoporous wall, high surface area and pore volume has been fabricated using the simple polymerization reaction between ethylene diamine and carbon tetrachloride in mesoporous silica media. The structural order and textural properties of nanostructured materials were studied by XRD, elemental analysis, and nitrogen Adsorption-desorption experiment. Adsorption of Chromate over various porous adsorbents such as mesoporous carbon (MC), N-doped mesoporous carbon (MCN), and amino modified mesoporous carbon (AMC) was studied from solutions with different concentration, temperature and pH in polar (water) solvent. The adsorption isotherms of Chromate were in agreement with Langmuir model, moreover, the uptake capacity of Chromate over MCN was much higher than amino modified mesoporous carbon (AMC) and pristine mesoporous carbon adsorbent.

scholarly journals Removal of dissolved organic nitrogen amino acid from aqueous solutions using activated carbon based on date pits

2020 ◽  
Vol 15 (4) ◽  
pp. 1158-1173
Author(s):  
Badreddine Belhamdi ◽  
Zoulikha Merzougui ◽  
Hamza Laksaci ◽  
Chemseddine Belabed ◽  
Salim Boudiaf ◽  
...  
Keyword(s):  
Amino Acid ◽  
Activated Carbons ◽  
Textural Properties ◽  
Sem Analysis ◽  
Solution Ph ◽  
Chlorinated Drinking Water ◽  
Ft Ir ◽  
Adsorption Desorption ◽  
Date Pits ◽  
By Products

Abstract Nitrogenous disinfection by-products (N-DBPs) in chlorinated drinking water are receiving increasing attention due to their elevated toxicities. An effective strategy to control N-DBP formation is to reduce their nitrogenous precursors (amino acids) before disinfection. This work was undertaken to study free amino acid l-tyrosine adsorption onto two activated carbons synthesized from date pits. The amino acid is plentiful in low-molecular weight algal organic matter, which helps the formation of nitrogenous and carbonaceous disinfection by-products during water treatment. The equilibrium adsorption of l-tyrosine was studied on well-characterized activated carbons prepared by KOH (ACK) and ZnCl2 (ACZ) activation, possessing textural properties evaluated by SEM analysis, N2 adsorption–desorption isotherms and FT-IR spectroscopy. Batch experiments were conducted to determine the activated carbons’ adsorption capacities. The effect of contact time, initial adsorbate concentration, solution pH, and temperature were studied. The Langmuir model gave the best fit for the experimental data of l-tyrosine with a maximum monolayer adsorption capacity of 178.57 and 102.04 mg·g−1 on ACK and ACZ, respectively. Thermodynamic parameters ΔG°, ΔH° and ΔS° were also estimated for the adsorption study. The adsorption was spontaneous and exothermic, and involved physisorption.

Industrial Fermentation Waste Aspergillus niger as Adsorbent for Sequestering Cr6 + from Aqueous Solution

2014 ◽  
Vol 955-959 ◽  
pp. 2841-2844
Author(s):  
Wei Na Xue ◽  
Yan Bo Peng ◽  
Jie Min Cheng
Keyword(s):  
Aspergillus Niger ◽  
Contact Time ◽  
Adsorption Equilibrium ◽  
Langmuir Model ◽  
Solution Ph ◽  
Industrial Fermentation ◽  
Batch System ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Biosorption Equilibrium

Biosorption of Cr6 + ions by industrial fermentation waste Aspergillus niger free dry mycelium was investigated in a batch system..The influences of Cr6 +concentration, biosorbent dose, solution pH and contact time on Cr6 +were investigated.Optimum biosorption was observed to be 73.5% at pH 5,biosorbent dose 20g/L, initial Cr6 + concentration 100 mg/L. Adsorption equilibrium was established in 800 min at 30°C. The Langmuir model compared to the Biosorption equilibrium data were best described by Langmuir isotherm model, R2=0.9999.

Removal of Low Concentration Chromium (III) from Aqueous Solution with 4 Microbial Biosorbents

2012 ◽  
Vol 610-613 ◽  
pp. 1863-1870
Author(s):  
Xin Li ◽  
Yong Liang Sun ◽  
Lin Zhou ◽  
Ju Fang Wang ◽  
Wen Jian Li
Keyword(s):  
Contact Time ◽  
Mass Concentration ◽  
Ph Value ◽  
National Standard ◽  
Batch Experiments ◽  
Solution Ph ◽  
Low Concentration ◽  
Ft Ir ◽  
Biomass Dosage ◽  
Optimal Ph

The low concentration Chromium (Ⅲ) adsorption was studied by 4 biosorbents (TP, XB, MY and TQ), which were isolated from Chrome-tanned leather construction section sludge. Batch experiments were carried out to investigate the effect of contact time, solution pH, biomass dosage, initial concentration of copper and temperature on biosorption efficiency. The experiment results showed that the concentration of chromium (Ⅲ) could meet the national standard (≤1.5mg/L) after treatment. The optimal pH value, mass concentration and temperature of biosorption was 4.0, 0.5g/L and 30°C, respectively. When the biosorbent were treated by [ NaOH ]= 0.3 mol/L, absorption capacitie was increased by 34.54%、23.21%、17.86% and 38.96% respectively. And from the results of SEM (Scanning electron microscope) and FT-IR (Fourier Transform infrared spectroscopy), the structure and functional groups of biosorbents was changed after the biosorption.

scholarly journals Structural and Textural Properties of Perchlorated and Persulphated Mixed (Hydr)Oxides of Zirconium and Titanium

2002 ◽  
Vol 20 (8) ◽  
pp. 707-722 ◽  
Author(s):  
Gamal M.S. El Shafei ◽  
Afaf A. Zahran
Keyword(s):  
Surface Area ◽  
Opposite Effect ◽  
Concentration Level ◽  
High Surface ◽  
High Surface Area ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Tetragonal Modification ◽  
Ft Ir ◽  
Aqueous Hclo

Perchlorated and persulphated mixed hydroxides of zirconium and titanium were prepared by coprecipitation and impregnation in aqueous HClO4 or (NH4)2S2O8 solutions of 0.05, 0.10, 0.20 and 0.40 M concentrations. An alternate sequence of impregnation followed by calcination or vice versa was conducted and the samples obtained studied using XRD, FT-IR, pyridine titration and low-temperature (–196°C) nitrogen adsorption methods. XRD indicated that the presence of titanium stabilized the tetragonal modification of zirconia and almost completely prevented the usual tetragonal → monoclinic transformation upon calcination at 650°C. Both S2O82– and ClO4− anions at their lowest concentration level (0.05 M) partially retarded the crystallization which occurred upon calcination at 650°C in their absence. However, the two anions showed different effects. Whereas the perchlorate anion prevented the formation of a crystalline titania phase (anatase) to a greater extent than that of crystalline zirconia, the persulphate anion showed the opposite effect. Complete inhibition was observed with both anions at a concentration of 0.4 M. This effect was attributed to adsorption of the anions on the hydroxy species of zirconium and titanium formed initially, as demonstrated by IR spectroscopy which showed that the anions were of lower symmetry, viz. C2v, due to their bonding to the hydroxy species. Calcination at 650°C caused the material formed initially to lose virtually all its initial high surface area because of crystallization. The prevention of crystallization by added anions was reflected in the retention of a relatively high surface area even after calcination at 650°C. The recorded difference in the interactions of the anions with the hydroxy species formed initially was also reflected in the texture of the anion-modified solids. The protecting influence of the ClO4− anion increased with its increasing concentration in the system, whereas the corresponding effect with the S2O82– anion increased up to 0.10 M concentration and then decreased at higher concentrations.

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