scholarly journals Removal of phenol from aqueous solution by adsorption onto seashells: equilibrium, kinetic and thermodynamic studies

2013 ◽  
Vol 3 (2) ◽  
pp. 119-127 ◽  
Author(s):  
Papita Das Saha ◽  
Jaya Srivastava ◽  
Shamik Chowdhury
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Phenol Concentration ◽  
Phenol Removal ◽  
Solution Ph ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Initial Phenol Concentration ◽  
Adsorption Equilibrium Data ◽  
Adsorbent Dose

The efficacy of seashells as a new adsorbent for removal of phenol from aqueous solutions was studied by performing batch equilibrium tests under different operating parameters such as solution pH, adsorbent dose, initial phenol concentration, and temperature. The phenol removal efficiency remained unaffected when the initial pH of the phenol solution was in the range of 3–8. The amount of phenol adsorbed increased with increasing initial phenol concentration while it decreased with increasing temperature. The adsorption equilibrium data showed excellent fit to the Langmuir isotherm model with maximum monolayer adsorption capacity of 175.27 mg g−1 at pH 4.0, initial phenol concentration = 50 mg L−1, adsorbent dose = 2 g and temperature = 293 K. Analysis of kinetic data showed that the adsorption process followed pseudo-second-order kinetics. Activation energy of the adsorption process, calculated using the Arrhenius equation, was found to be 51.38 kJ mol−1, suggesting that adsorption of phenol onto seashells involved chemical ion-exchange. The numerical value of the thermodynamic parameters (ΔG0, ΔH0 and ΔS0) indicated that adsorption of phenol onto seashells was feasible, spontaneous and endothermic under the examined conditions. The study shows that seashells can be used as an economic adsorbent for removal of phenol from aqueous solution.

scholarly journals Adsorption of Phenol from Aqueous Solution using Paper Waste

2019 ◽  
Vol 20 (1) ◽  
pp. 23-29
Author(s):  
Huda Adil Sabbar
Keyword(s):  
Contact Time ◽  
Phenol Concentration ◽  
Phenol Removal ◽  
Adsorption Models ◽  
Freundlich Model ◽  
Paper Waste ◽  
Equilibrium Data ◽  
Initial Phenol Concentration ◽  
Recyclable Resources ◽  
Adsorbent Dose

The exploitation of obsolete recyclable resources including paper waste has the advantages of saving resources and environment protection. This study has been conducted to study utilizing paper waste to adsorb phenol which is one of the harmful organic compound byproducts deposited in the environment. The influence of different agitation methods, pH of the solution (3-11), initial phenol concentration (30-120ppm), adsorbent dose (0.5-2.5 g) and contact time (30-150 min) were studied. The highest phenol removal efficiency obtained was 86% with an adsorption capacity of 5.1 mg /g at optimization conditions (pH of 9, initial phenol concentration of 30 mg/L, an adsorbent dose of 2 g and contact time of 120min and at room temperature). The well-known Langmuir and Freundlich adsorption models were studied. The results show that the equilibrium data fitted to the Freundlich model with R2=0.9897 within the concentration range studied. The main objective of this study is finding the best mixing and conditions for phenol removal by adsorption via paper waste.

scholarly journals (3-Aminopropyl) Triethoxysilane (APTES) Functionalized Magnetic Nanosilica Graphene Oxide (MGO) Nanocomposite for the Comparative Adsorption of the Heavy Metal (Pb(II), Cd(II) and Ni(II)) ions from Aqueous Solution

2021 ◽  
Author(s):  
C Donga ◽  
S Mishra ◽  
A Aziz ◽  
L Ndlovu ◽  
A Kuvarega ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Metal Ion ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Solution Ph ◽  
Magnetic Graphene Oxide ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Adsorption Equilibrium Data

Abstract (3-aminopropyl) triethoxysilane (APTES) modified magnetic graphene oxide was synthesized and applied in the adsorption of three heavy metals, Pb(II), Cd(II) and Ni(II) from aqueous solution. An approach to prepare magnetic GO was adopted by using (3-aminopropyl) triethoxysilane (APTES) as a functionalizing agent on magnetic nanosilica coupled with GO to form the Fe3O4@SiO2-NH2/GO nanocomposite. FT-IR, XRD, BET, UV, VSM, SAXS, SEM and TEM were used to characterize the synthesized nanoadsorbents. Batch adsorption studies were conducted to investigate the effect of solution pH, initial metal ion concentration, adsorbent dosage and contact time. The maximum equilibrium time was found to be 30 min for Pb(II), Cd(II) and 60 min for Ni(II). The kinetics studies showed that the adsorption of Pb(II), Cd(II) and Ni(II) onto Fe3O4@SiO2-NH2/GO followed the pseudo-second-order kinetics. All the adsorption equilibrium data were well fitted to Langmuir isotherm model and maximum monolayer adsorption capacity for Pb(II), Cd(II) and Ni(II) were 13.46, 18.58 and 13.52 mgg-1, respectively. The Fe3O4@SiO2-NH2/GO adsorbents were reused for at least 7 cycles without the leaching of mineral core, showing the enhanced stability and potential application of Fe3O4@SiO2-NH2/GO adsorbents in water/wastewater treatment.

scholarly journals Effective biosorption of phenol by the thermophilic cyanobacterium Phormidium sp.

2017 ◽  
Vol 76 (12) ◽  
pp. 3190-3194 ◽  
Author(s):  
Sevgi Ertuğrul Karatay ◽  
Gönül Dönmez ◽  
Zümriye Aksu
Keyword(s):  
Aqueous Solution ◽  
Specific Rate ◽  
Phenol Removal ◽  
Adsorption Models ◽  
Adsorption Time ◽  
Ph Values ◽  
Biosorption Process ◽  
Thermophilic Cyanobacterium ◽  
Equilibrium Data ◽  
Initial Phenol Concentration

Abstract The use of microbial biomass as biosorbent for phenol removal has been extensively studied, but its removal by biosorption by thermophilic cyanobacterium Phormidium sp. has not been investigated to the best of our knowledge. In the present study, some important parameters for biosorption process were optimized, starting with testing the effects of different pH values ranging from 1 to 12, and then initial phenol concentrations of 45.1, 115.3, 181.4, 243.3, 339.9 mg/L on phenol uptake. The efficiency of removal from aqueous solution was higher within the pH 6–8 range, with the maximum of 100% at pH 7 after 24 hours of adsorption time. The highest specific rate was observed as 165.1 mg/g in the presence of 339.9 mg/l initial phenol concentration. The Freundlich adsorption models were fitted to the equilibrium data, which indicated that phenol ions were favourably adsorbed by Phormidium sp.

scholarly journals Studying Ni(II) Adsorption of Magnetite/Graphene Oxide/Chitosan Nanocomposite

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Luyen T. Tran ◽  
Hoang V. Tran ◽  
Thu D. Le ◽  
Giang L. Bach ◽  
Lam D. Tran
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Entropy Change ◽  
Enthalpy Change ◽  
Nickel Ion ◽  
Adsorbent Dosage ◽  
Equilibrium Data ◽  
Adsorption Equilibrium Data

In this paper, Fe3O4/graphene oxide/chitosan (FGC) nanocomposite was synthesized using coprecipitation method for application to removal of nickel ion (Ni(II)) from aqueous solution by adsorption process. To determine residue Ni(II) ions concentration in aqueous solution after adsorption process, we have used UV-Vis spectrophotometric method, which is an effective and exact method for Ni(II) monitoring at low level by using dimethylglyoxime (DMG) as a complex reagent with Ni(II), which has a specific adsorption peak at the wavelength of 550 nm on UV-Vis spectra. A number of factors that influence Ni(II) ions adsorption capacity of FGC nanocomposite such as contact time, adsorption temperature, and adsorbent dosage were investigated. Results showed that the adsorption equilibrium is established after 70 minutes with the adsorbent dosage of 0.01 g.mL−1 at 30°C (the room temperature). The thermodynamic and kinetic parameters of this adsorption including free enthalpy change (∆G0), enthalpy change (∆H0), entropy change (∆S0), and reaction order with respect to Ni(II) ions were also determined. The Ni(II) ions adsorption equilibrium data are fitted well to the Langmuir isotherm and the maximum monolayer capacity (qmax) is 12.24 mg.g−1. Moreover, the FGC adsorbent can be recovered by an external magnet; in addition, it can be regenerated. The reusability of FGC was tested and results showed that 83.08% of removal efficiency was obtained after 3 cycles. The synthesized FGC nanocomposite with many advantages is a promising material for removal of heavy metal ions from aqueous solution to clean up the environment.

Simultaneous Removal of Ammonium and Phosphate from Aqueous Solution by Calcium Chloride-Modified Zeolite

2011 ◽  
Vol 356-360 ◽  
pp. 1581-1585 ◽  
Author(s):  
Yan Li Sun ◽  
Jian Wei Lin ◽  
Hong Huang ◽  
Wei Ying Zhang ◽  
Dan Dan Ma
Keyword(s):  
Aqueous Solution ◽  
Calcium Chloride ◽  
Removal Efficiency ◽  
Chemical Precipitation ◽  
Phosphate Removal ◽  
Isotherm Models ◽  
Solution Ph ◽  
Modified Zeolite ◽  
Equilibrium Data ◽  
Adsorption Equilibrium Data

Abstract. In this study, the simultaneous adsorption characteristics of ammonium and phosphate from aqueous solution by calcium chloride-modified zeolite were investigated. Results showed that the adsorption kinetic data of ammonium and phosphate onto the calcium chloride-modified zeolite could be well described by a pseudo-second-order model. The adsorption equilibrium data of ammonium onto the calcium chloride-modified zeolite fitted to the Langmuir isotherm model better than the Freundlich and Dubinin-Radushkevich isotherm models. The phosphate removal efficiency of calcium chloride-modified zeolite increased with the initial concentration of ammonium in aqueous solution. The ammonium removal efficiency of calcium chloride-modified zeolite increased with increasing solution pH from 7.0 to 9.0, but decreased with increasing solution pH from 9.0 to 10.0. The phosphate removal efficiency of calcium chloride-modified zeolite increased dramatically with increasing solution pH from 7.0 to 9.0, but decreased with increasing solution pH from 9.0 to 10.0. The mechanism for the adsorption of ammonium onto the calcium chloride-modified zeolite was ions exchange, and the mechanism for the removal of phosphate by the calcium chloride-modified zeolite was chemical precipitation.

scholarly journals Adsorption Study of Some Sulphanilic Azo Dyes on Charcoal

2011 ◽  
Vol 8 (2) ◽  
pp. 739-747 ◽  
Author(s):  
H. J. Mohammed ◽  
B. J. Kadhim ◽  
Aseel Sh. Mohammed
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Batch Adsorption ◽  
Process Variables ◽  
Equilibrium Isotherms ◽  
Freundlich Isotherms ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Series Of Experiments ◽  
Adsorbent Dose

Studies on the removal of two dyes (sulphanilic azo antipyrine and sulphanilic azo imidazole) from aqueous solution by adsorption on charcoal as an adsorbent were carried out. A series of experiments were under taken in a batch adsorption technique to access the effect of the process variablesi.e. contact time, initial dye concentration, initial pH, adsorbent dose and temperature. Adsorbent dosage (0.1 g) higher value for both dyes. The equilibrium in the solution was observed within (35 min) of two sulphanilic dyes on charcoal. The equilibrium isotherms for both dyes were determined to describe the adsorption process. The results showed that the equilibrium data was fitted by of the Freundlich isotherms on charcoal surface. The result obtained shows that the adsorption isotherm for both dyes on charcoal was according to Giles classification. The thermodynamic factors such as ∆Η, ∆G and ∆S were calculated.

Biosorption of C. I. Reactive Red 2 from Aqueous Solution by Saccharomyces Cerevisiae

2013 ◽  
Vol 739 ◽  
pp. 327-331
Author(s):  
Li Fang Zhang ◽  
Yin Ling Wang
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Aqueous Solution ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Langmuir Adsorption ◽  
Optimum Ph ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Adsorption Equilibrium Data ◽  
Reactive Red 2

The biosorption of C. I. Reactive Red 2 from aqueous solution onto biomass of Saccharomyces cerevisiae was examined. The biosorption studies were carried out under various parameters such as initial pH, contact time and initial dye concentration. The experimental results showed that optimum pH for dye biosorption was found to be 2.0 for the yeast biomass. The bosorption capacity was increased with the increasing initial dye concentration in studied dye concentration range. It was found that the adsorption equilibrium data followed the Langmuir adsorption model. The maximum adsorption capacity obtained from the Langmuir equation at temperature of 30°C was 500mg/g (R2=0.991) for the dye. The results indicate that the biomass of Saccharomyces cerevisiae can be used as an effective biosorbent to removal C. I. Reactive Red 2 from aqueous solution.

Lignin-Quaternary Adsorbent: Synthesis, Characterization and Application for 2, 4, 6-Trinitrotoluene (TNT) Adsorption

2009 ◽  
Vol 620-622 ◽  
pp. 117-120 ◽  
Author(s):  
Xiu Rong Zhuo ◽  
Xue Gang Luo ◽  
Xiao Yan Lin ◽  
Chang Gang Xu
Keyword(s):  
Aqueous Solution ◽  
Mechanical Strength ◽  
Ir Spectra ◽  
Quaternary Ammonium ◽  
Langmuir Isotherm ◽  
Adsorption Process ◽  
Initial Concentration ◽  
Ether Bond ◽  
Initial Ph ◽  
Adsorbent Dose

A lignin-quaternary adsorbent was made from lignin after phenolization and then amination. As-prepared adsorbent was characterized by SEM, IR and DMA. Effects of adsorbent dose, initial pH and concentration on 2, 4, 6-Trinitrotoluene (TNT) removals from aqueous solution by adsorption of this adsorbent were comprehensively investigated. IR spectra showed that the product comprises quaternary ammonium groups in the form of ether bond. The mechanical strength of the adsorbent is enhanced by combining of PVA. It was possible to remove 66% of TNT from aqueous solution with 0.1 g of the adsorbent under certain conditions (100 mg/L and 25 °C). The results indicated that the amount of TNT adsorbed onto the adsorbent increased with increasing initial concentration; however, it decreased with an increase in pH. The adsorption process was determined to be consistent with the Langmuir isotherm.

Removal of Lead from Aqueous Solution by Sewage Sludge Carbon Adsorbent

2011 ◽  
Vol 239-242 ◽  
pp. 1866-1869 ◽  
Author(s):  
Chang Bin Xia ◽  
Fu Jian Zhou ◽  
Yuan Chen ◽  
Ling Zhang
Keyword(s):  
Aqueous Solution ◽  
Sewage Sludge ◽  
Metal Removal ◽  
Carbon Adsorbent ◽  
Ion Concentration ◽  
Lead Ion ◽  
Solution Ph ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Efficient Adsorbent

The capacity of sewage sludge carbon (SSC) for the removal of lead ion from aqueous solution has been studied under different conditions,namely SSC particle size,initial pH,initial Pb2+ ion concentration and solution temperature.The results show that equilibrium data obtained fit the Langmuir adsorption isotherms,this SSC is an efficient adsorbent for removing lead ion.The finer the SSC particle used,the higher the metal adsorption capacity.An initial solution pH ≥4.5 is favourable for obtaining high metal removal.

scholarly journals Adsorption Isotherms studies of the removal of Indigo Blue dye from aqueous solution using chemically modified coconut shell

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Olaniyi K Yusuff ◽  
Adenike M. O Abdulraheem ◽  
Omowumi D. Agboola
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Dye Adsorption ◽  
Coconut Shell ◽  
Isotherm Models ◽  
Blue Dye ◽  
Chemically Modified ◽  
Equilibrium Data ◽  
Indigo Blue ◽  
Adsorption Equilibrium Data

Introduction: The conversion and utilization of agricultural wastes in environmentally friendly processes have transformed these materials into useful rather than waste materials. Aim: This study investigates the adsorption of indigo blue dye from aqueous solution onto coconut shell, a low cost agricultural waste material in a batch process. Materials and Methods: Pulverized coconut shell was chemically modified and characterized using the Fourier Transform Infra Red spectroscopy and Scanning Electron Microscopy. Adsorption process using the chemically modified coconut shell was studied as a function of pH, initial dye concentration, adsorbent dose, and contact time. The adsorption equilibrium data were analyzed with Langmuir, Freundlich and Temkin isotherm models. Results: The results revealed that percentage of the indigo dye adsorbed from aqueous solution varied linearly with the adsorbent dose, concentration and time with maximum percentage dye adsorption of 88.4% at 70 mg dosage, 95.8% at 0.05 mg/L concentration and 90% at 1 hr contact time but varies non-linearly with pH with maximum percentage dye adsorption of 92.9% attained at pH of 5. The adsorption equilibrium data were analyzed with Langmuir, Freundlich and Temkin isotherm models with the Langmuir isotherm having the best fit to the adsorption process with R2 value of 0.998. The experimental data were best described by the pseudo-second order kinetics model. FTIR analyses reveal that the adsorption process was through a chemical interaction of the dye with some functional groups at the surface of the adsorbent Conclusion: The chemically modified coconut shell is an effective adsorbent for the removal of indigo dye from aqueous solution is by chemisorption process with the adsorbent surface energetically homogeneous (n < 1). Keywords: Adsorption, Indigo blue dye, Coconut Shell, Kinetics, Aqueous solution.

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