scholarly journals The biosorption potential of modified bottle gourd shell for phosphate: Equilibrium, kinetic and thermodynamic studies

2018 ◽  
Vol 24 (4) ◽  
pp. 319-332 ◽  
Author(s):  
Dragana Markovic-Nikolic ◽  
Aleksandar Bojic ◽  
Danijela Bojic ◽  
Milorad Cakic ◽  
Dragan Cvetkovic ◽  
...  
Keyword(s):  
Kinetic Studies ◽  
Bottle Gourd ◽  
Batch Mode ◽  
Freundlich Model ◽  
Biosorption Process ◽  
Elemental Analyses ◽  
Dominant Process ◽  
Kinetic And Thermodynamic Studies ◽  
Coexisting Ions ◽  
Lagenaria Vulgaris

In order to preserve the environment and prevent the occurrence of eutrophication, a new quaternary ammonium biosorbent based on the bottle gourd (Lagenaria vulgaris) shell (QALVS) was prepared and characterized in the present study. The results of FTIR and elemental analyses confirmed the successful modification of the lignocellulosic biomass and showed that 15.68 mg N g-1 was incorporated as cationic ?N+R3 group. The biosorbent was tested to remove phosphate from aqueous solution in batch mode. Kinetic studies indicated that the biosorption of phosphate onto QALVS can be fitted by a non-linear pseudo nth-order model (n ? 1) very well. The Freundlich model provided the best description of the biosorption process. The maximum phosphate biosorption capacity was 16.69 mg P g-1 for QALVS at 20?C and pH 6. Thermodynamic parameters indicate that the biosorption of phosphate by QALVS is exothermic. The anion exchange mechanism was the dominant process, in addition to physisorption. Coexisting ions exhibited a distinct effect on phosphate biosorption with the order of NO3 - > SO4 2- > Cl-. The QALVS biosorbent could be repeatedly used in phosphate biosorption with slight losses in initial biosorption capacities

Optimization, kinetic and thermodynamic studies on bio-sorption and bio-reduction of chromium hexavalent by Myrtus communis leaves

2021 ◽  
Vol 14 ◽  
Author(s):  
Toufek Metidji ◽  
Hacene Bendjeffal ◽  
Abdelkrim Djebli ◽  
Hadjer Mamine ◽  
Hamida Bekakria Bekakria ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Kinetic Studies ◽  
Myrtus Communis ◽  
Order Model ◽  
Total Removal ◽  
Batch Mode ◽  
Thermodynamic Studies ◽  
Pseudo Second Order ◽  
Electron Microscope Analysis ◽  
Kinetic And Thermodynamic Studies

Aims: The efficiency of Myrtus communis leaves to eliminate Cr(VI) from aqueous solutions, has been investigated. Background: Optimization, kinetic and thermodynamic studies on bio-sorption and bio-reduction of Cr(VI) by Myrtus communis leaves. Objective: To eliminate Cr(VI) from aqueous solutions. Method: batch mode studies, kinetic and thermodynamic studies Result: The maximum bio-removal was obtained at an initial Cr(VI) concentration of 100 mg/L, a biomass of 0.150 g, pH 2 and temperature of 25°C. The modeling study has shown that the bio-removal kinetics obeyed to the pseudo-second-order model along with an R2= 0.9947 Conclusion: It has been noticed that a total removal of Cr(VI) after 60 minutes. Also, the kinetic studies have indicated that the bioreduction of Cr (VI) to Cr (III) coupled with biosorption was produced on biomass sites. Based on the determined thermodynamic parameters (Gibbs energy (∆G0), enthalpy (∆H0), and entropy (∆S0)), the bio-removal process was found to be endothermic and spontaneous in nature. Other: Myrtus communis leaves powder was characterized by spectroscopy (FTIR) and scanning electron microscope analysis (SEM-EDX)

scholarly journals Water defluoridation by alumina modified Turkey clinoptilolite: equilibrium, kinetic models and experimental design approaches

2017 ◽  
Vol 18 (1) ◽  
pp. 14-22 ◽  
Author(s):  
Selim Selimoglu ◽  
Esra Bilgin Simsek ◽  
Ulker Beker
Keyword(s):  
Natural Zeolite ◽  
Kinetic Studies ◽  
Order Reaction ◽  
Operating Conditions ◽  
Second Order Reaction ◽  
Freundlich Model ◽  
Box Behnken Design ◽  
Fluoride Adsorption ◽  
Exothermic Process ◽  
Pseudo Second Order

Abstract In the current work, alumina modified natural zeolite (Z-Al) was used for fluoride adsorption in aqueous solution. Effects of process parameters such as pH, temperature, initial concentration and contact time were investigated. Box–Behnken design was found effective in defining the operating conditions for fluoride sorption onto Z-Al. Confirmatory experiments were conducted to examine the reliability of the regression equation. The predicted (2.261 mg g−1) and experimental (2.289 mg g−1) capacities were found to be similar, demonstrating the accuracy of the model. The fluoride adsorption onto Z-Al was well described by the Freundlich model. Kinetic studies revealed that the adsorption followed a pseudo-second-order reaction. Thermodynamic parameters depicted that the fluoride adsorption on the alumina modified zeolite was a spontaneous and exothermic process. The co-existing ions affected the defluoridation performance significantly. Regeneration of exhausted Z-Al was achieved with H2SO4.

scholarly journals Biosorption of Ni(II), Pb(II) and Zn(II) on calcium alginate beads: equilibrium, kinetic and mechanism studies

2016 ◽  
Vol 18 (3) ◽  
pp. 81-87 ◽  
Author(s):  
Józef Nastaj ◽  
Agata Przewłocka ◽  
Monika Rajkowska-Myśliwiec
Keyword(s):  
Metal Ions ◽  
Calcium Alginate ◽  
Alginate Beads ◽  
Divalent Metal Ions ◽  
Batch Mode ◽  
Biosorption Process ◽  
Lead And Zinc ◽  
Component Systems ◽  
Pseudo Second Order ◽  
Removal Of Metal Ions

Abstract The biosorption process of three divalent metal ions – nickel, lead and zinc- from on calcium alginate from aqueous solution was studied, in single component systems. The biosorbent were investigated by Fourier Transform Infrared Spectroscopy. The batch mode experiments of the adsorption process were carried out as a function of pH, initial metal ions concentration, sorbent dosage and contact time. The adsorption influencing parameters for the maximum removal of metal ions were optimized. The experimental data were analyzed using the Langmuir, Freundlich, Langmuir-Freundlich, Koble-Corrigan and Redlich-Peterson models. The kinetic data of biosorption process were evaluated using pseudo-first and pseudo-second order equations. The Weber and Morris model was employed to interpret the metal ions diffusion in biosorption process.

scholarly journals Adsorption of Copper Ions (Cu++) in Aqueous Solution Using Activated Carbon and Biosorbent from Indian Jujube (Ziziphus mauritiana) Seed Hulls

2020 ◽  
pp. 13-24
Author(s):  
Harouna Massai ◽  
Djakba Raphael ◽  
Mouhamadou Sali
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Copper Ions ◽  
Carbon Powder ◽  
Ziziphus Mauritiana ◽  
Batch Mode ◽  
Freundlich Model ◽  
Jar Test ◽  
Standard Procedures ◽  
Indian Jujube

The present work aimed at mitigating the level of copper ions (Cu++) by adsorption in aqueous solution using activated carbon powder (AC) and biosorbent (BS) from the Indian jujube seed hulls. The AC and BS were prepared from the Indian jujube seed hulls and characterized    using standard procedures. In addition, the adsorption effects of Indian jujube seed hulls through the AC and BS were carried out using jar test experiment (batch mode) at different pH (1, 2, 3, and 4), ionic strengths (100-600 mg/L) and stirring speed (120rpm). Therefore, it was found that the adsorption time at equilibrium were 10 and 5 minutes respectively for the AC and the BS.  Furthermore, it was found that the reduction of copper ions were 99.40% and 73.08% for aqueous solutions of 100 ppm and 500 ppm respectively at the equilibrium state. It was also revealed that when the mass of the AC or the BS increases, the quantities of ions adsorbed per gram decrease. The maximum pH of adsorption for the AC was found to be pH=1, while it was found to be pH=4 for the BS. The Freundlich model indicated that the adsorption of copper ions by the Indian jujube is linear while the Temkin and Dubinin-Kagana-Radushkevich models described the adsorption as a physical reaction. It was finally observed that the adsorption of copper ions by the AC and the BS from Indian jujube seed hulls influenced by the addition of some concentration of NaCl.

scholarly journals Adsorption-Kinetic Studies of Mordant Exhaust Dyeing of Cotton and Silk Fabrics with Dye Extract of M. lucida Plant Species

2021 ◽  
Vol 75 ◽  
Author(s):  
Janani Loum ◽  
Robert Byamukama ◽  
P.A.G. Wanyama
Keyword(s):  
Adsorption Isotherms ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Isotherm Models ◽  
Freundlich Model ◽  
Reaction Orders ◽  
Dyed Fabrics ◽  
Silk Fabrics ◽  
Exhaust Dyeing ◽  
Traditional Natural

ABSTRACT The kinetics and adsorption isotherms of the extremely slow traditional natural exhaust dyeing that takes many hours or days have been studied purposely to find means of improving the process. The dyeing of cotton and silk fabrics using dye extract of M. lucida at 50 °C were elucidated with graphs to predict the reaction orders and identify the appropriate adsorption isotherm model(s). Since the dye is UV active, changes in UV absorbance were used in place of changes in concentrations. The simultaneous and post mordanting methods followed pseudo-second-order reactions, hence chemisorption. However, mordant application to the dyed fabrics during post mordant followed a pseudo-first-order model, largely physisorption. Dyeing has followed Langmuir and Freundlich isotherm models with linear correlation r2 ranging between 1 and 0.998. From the Freundlich model and values of Langmuir constant RL (0.9307 to 1.0), the process is homogeneous, forming a favourable and linear monolayer. Accordingly, the dyeing speed can be improved by increasing the concentration of dye liquor. Additionally, according to the Freundlich model, higher dye intensity on fabrics is recorded in post mordanting. Keywords: adsorption isotherms, equilibrium, exhaust dyeing, mordant, rate law

Equilibrium and kinetic studies on biosorption of Pb(II) by common edible macrofungi: a comparative study

2016 ◽  
Vol 62 (4) ◽  
pp. 329-337 ◽  
Author(s):  
Yuan Jiang ◽  
Ruixia Hao ◽  
Shiqin Yang
Keyword(s):  
Kinetic Studies ◽  
Risk Level ◽  
Individual Species ◽  
Lead Removal ◽  
Freundlich Model ◽  
Hypsizygus Marmoreus ◽  
Agrocybe Cylindracea ◽  
Removal Capacity ◽  
Equilibrium Data ◽  
Pseudo Second Order

In this work, we studied the natural bioaccumulation and biosorption of Pb(II) in several common edible macrofungi. The macrofungi include the following species: Lentinus edodes, Pleurotus eryngii, Flammulina velutipes, Hypsizygus marmoreus, and Agrocybe cylindracea. The present analysis of Pb(II) revealed distinct capabilities of metal accumulation among individual species. Moreover, the natural concentrations of lead did not reach a health risk level when cultivated in uncontaminated soil. In the biosorption experiment by edible macrofungi, we found that the equilibrium data of living sporocarp (P. eryngii and H. marmoreus) and the homogenate of L. edodes and F. velutipes fit the Freundlich model well. Other data samples exhibited a better fit to the Langmuir model. The edible macrofungi showed a higher lead removal capacity than did other biosorbents. Furthermore, the pseudo-second-order kinetics model exhibited the best fit to the biosorption processes. The effectiveness of edible macrofungi as biosorbents for Pb(II) was confirmed.

scholarly journals Biosorption of Pb(II) Ions byKlebsiellasp. 3S1 Isolated from a Wastewater Treatment Plant: Kinetics and Mechanisms Studies

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Antonio Jesús Muñoz ◽  
Francisco Espínola ◽  
Manuel Moya ◽  
Encarnación Ruiz
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Kinetic Studies ◽  
Mechanism Study ◽  
Lead Uptake ◽  
Equilibrium Studies ◽  
Operating Variables ◽  
Biosorption Process ◽  
Central Composite Experimental Design

Lead biosorption byKlebsiellasp. 3S1 isolated from a wastewater treatment plant was investigated through a Rotatable Central Composite Experimental Design. The optimisation study indicated the following optimal values of operating variables: 0.4 g/L of biosorbent dosage, pH 5, and 34°C. According to the results of the kinetic studies, the biosorption process can be described by a two-step process, one rapid, almost instantaneous, and one slower, both contributing significantly to the overall biosorption; the model that best fits the experimental results was pseudo-second order. The equilibrium studies showed a maximum lead uptake value of 140.19 mg/g according to the Langmuir model. The mechanism study revealed that lead ions were bioaccumulated into the cytoplasm and adsorbed on the cell surface. The bacterium  Klebsiellasp. 3S1 has a good potential in the bioremoval of lead in an inexpensive and effective process.

scholarly journals Study about Doping Ion La3+ onto Surface of Pyrolusite Ore for Removing Simultaneously Both Fluoride and Phosphate from Wastewater

2017 ◽  
Vol 2017 ◽  
pp. 1-11
Author(s):  
Nguyen Thi Hue ◽  
Nguyen Hoang Tung
Keyword(s):  
Aqueous Solution ◽  
Kinetic Studies ◽  
Phosphate Adsorption ◽  
Fluoride Removal ◽  
Fluoride Adsorption ◽  
Pseudo Second Order ◽  
Xrd Techniques ◽  
Adsorbent Characterization ◽  
Coexisting Ions

Lanthanum has been doped onto the surface of the natural Pyrolusite for simultaneous removal of phosphate and fluoride in aqueous solution. The adsorbent characterization of the materials was observed by the SEM, BET, and XRD techniques. The dynamics and isotherms models of fluoride and phosphate adsorption, with respect to pH, pHPZC, adsorbent dose, and effect of coexisting ions, were studied. The results showed that lanthanum doped Pyrolusite ore (LDPO) relatively highly adsorbed amount of phosphate and fluoride from aqueous solution. Phosphate and fluoride removal efficiencies of LDPO are approximately 97% and 95%, respectively. Pseudo-first order for kinetic studies of phosphate and fluoride removal of the LDPO was observed with high correlations for fluoride but weak correlations for phosphate. However, pseudo-second order for kinetic studies was high correlation for both phosphate and fluoride. The phosphate and fluoride adsorption capacities of the LDPO significantly decreased with the existence of coions (sulfate, chloride, and nitrate) in the aqueous solution.

The kinetics of elementary reactions involving the oxides of sulphur II. Chemical reactions in the sulphur dioxide afterglow

1966 ◽  
Vol 295 (1443) ◽  
pp. 363-379 ◽  
Keyword(s):  
Excited States ◽  
Sulphur Dioxide ◽  
Kinetic Studies ◽  
Absolute Intensity ◽  
Third Order ◽  
Elementary Reactions ◽  
The Third ◽  
Dominant Process ◽  
Recombination Reactions ◽  
Kinetics Of

The main recombination reactions in the sulphur dioxide afterglow are shown to be O + SO 2 + M = SO 3 + M (1) and O + SO + M = SO 2 + M , (2) with rate constants of (4·7 ± 0·8) x 10 15 and (3·2 ± 0·4) x 10 17 cm 6 mole -2 s -1 respectively at 300°K for M = Ar. Reaction (2) is the dominant process removing sulphur monoxide (SO) which is otherwise remarkably unreactive. The absolute intensity of the sulphur dioxide afterglow is found to be I = 1·5 x 10 8 [O] [SO] cm 3 mole -1 s -1 for argon carriers at pressures between 0·25 an d 3·0 mmHg. The afterglow emission comes from three excited states of SO 2 . Spectroscopic and kinetic studies show that these are populated subsequent to or by the third order combination reaction (2). Excited SO 2 is removed mainly by electronic quenching.

scholarly journals Treatment of the Allura red food colorant contaminated water by a novel cyanobacteria Desertifilum tharense

2021 ◽  
Author(s):  
Ülküye Dudu Gül ◽  
Zeynep Mine Şenol ◽  
Burcu Ertit Taştan
Keyword(s):  
Sem Analysis ◽  
Sequencing Analysis ◽  
Order Kinetic ◽  
Allura Red ◽  
Food Colorant ◽  
Biosorption Process ◽  
Rrna Sequencing ◽  
Pseudo Second Order ◽  
Kinetic And Thermodynamic Studies ◽  
Chlorophyll A Content

Abstract The biosorption properties of a newly isolated and identified cyanobacterium called Desertifilum tharense were investigated in the current study. Following morphological and molecular identification (16S rRNA sequencing analysis), the food colorant removal potential of this new isolate was determined. Moreover, the isotherm, kinetic, and thermodynamic studies were performed, and also the biosorbent characterization was studied after and before colorant biosorption with FTIR and SEM analysis. Additionally, the changes in chlorophyll content of the biosorbent were examined after and before colorant treatment. The newly isolated cyanobacterial biosorbent removed 97% of Allura red food colorant/dye at 1,500 mg L−1 initial dye concentration successfully at optimal conditions. Langmuir isotherm and pseudo-second-order kinetic models were fitted with the biosorption of the dye. The D-R model showed that the biosorption process physically occurred. The chlorophyll-a content of the biosorbent was negatively affected by the biosorption. The newly isolated and identified cyanobacterium seems to be a successful candidate for the use to treat highly dye concentrated wastewaters.

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