scholarly journals Nonlinear regression for analysis of the uptake of KMnO4 from aqueous solutions onto natural marl

2021 ◽  
Vol 1204 (1) ◽  
pp. 012003
Author(s):  
E A Bouzeghaia ◽  
S Hafsi ◽  
N Gherraf
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Low Ph ◽  
Suitable Model ◽  
Surface Functional Groups ◽  
Experimental Adsorption ◽  
Adsorption Capacities ◽  
Adsorption Data ◽  
Batch Technique ◽  
Formation Of Complexes

Abstract The present work aims to evaluate the performance of raw marl collected from the region of Oum El Bouaghi on the elimination of KMnO4 from aqueous solution. The adsorption capacities were studied using the batch technique as a function of pH, initial concentration and temperature. The maximum adsorption for KMnO4 was found to be 83.517% at pH 3.0. When the pH is low (pH<3.0), the uptake of KMnO4 occurs with an electrostatic attraction between the MnO4-ions and the surface proton groups, while at pH ≥3.0-8.0, the formation of complexes with the surface functional groups during the adsorption process and/or cation exchange are responsible for retention of Mn(II) ions onto marl. Experimental adsorption data were modeled with different nonlinear isotherms and kinetic models. Furthermore, statistical errors (SSE, SD, ARE, χ 2, R2 and R2 adj) were calculated to choose the suitable model. Langmuir isotherm was found to be best for fitting the experimental data. The calculated thermodynamic parameters indicated that adsorption process was physical, spontaneous and endothermic in nature. From this work, it was concluded that the natural marl can be used for effective elimination of KMnO4 from aqueous solution and wastewater.

Hydrogen sulfide emission sources, regulations, and removal techniques: a review

2018 ◽  
Vol 34 (6) ◽  
pp. 837-854 ◽  
Author(s):  
Omar Abed Habeeb ◽  
Ramesh Kanthasamy ◽  
Gomaa A.M. Ali ◽  
Sumathi Sethupathi ◽  
Rosli Bin Mohd Yunus
Keyword(s):  
Single Phase ◽  
Adsorption Process ◽  
Petroleum Refinery ◽  
Low Cost ◽  
Emission Sources ◽  
Surface Functional Groups ◽  
Composite Adsorbents ◽  
Adsorption Capacities ◽  
Gaseous Compound ◽  
Operational Simplicity

Abstract This review highlights the recent technologies of H2S removal from wastewater in the petroleum refinery. H2S is a harmful, putrid, and hazardous gaseous compound. The main processes such as physicochemical, chemical, biological, and electrochemical methods were compared and discussed in detail. The effects of various parameters and adsorbent characteristics were highlighted and correlated with the adsorption capacities. Surface functional groups and porosity surface area play a crucial role in the process of single-phase and composite adsorbents. Composite materials impregnated with some metals showed high removal efficiencies. It was found that the adsorption process is the most relevant way for H2S removal due to its high removal efficiency, low cost, eco-friendly, and operational simplicity. This study serves as a useful guideline for those who are interested in H2S removal.

scholarly journals High Removal Efficiency of Diatomite-Based X Zeolite for Cu2+ and Zn2+

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6525
Author(s):  
Guangyuan Yao ◽  
Yuqiang Liu ◽  
Shuilin Zheng ◽  
Ya Xu
Keyword(s):  
Ion Exchange ◽  
Adsorption Process ◽  
Interface Properties ◽  
Order Model ◽  
Adsorption Capacities ◽  
Adsorption Data ◽  
X Zeolite ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Kinetics And Isotherms

Diatomite-based X zeolite was obtained and its crystallinity, morphology, and interface properties were investigated by XRD, BET, SEM, EDS, and XRF. The obtained X zeolite possessed a unique meso-microporous structure and showed good ion exchange properties for Cu2+ and Zn2+. The pseudo-second-order model and Langmuir isotherm model can best describe the adsorption kinetics and isotherms of Cu2+ and Zn2+, respectively. The maximal adsorption capacities of X zeolite for Cu2+ and Zn2+ were 146 and 195 mg/g at 323 K, respectively. Meanwhile, the adsorption process for Cu2+ and Zn2+ were chemical adsorption and ion exchange, respectively. Furthermore, the adsorption data turned out to be an endothermic and spontaneous process. Compared with other reported materials, the adsorption capacity of X zeolite synthesized from diatomite was among the highest. Therefore, it could be a promising adsorbent for the disposal of wastewater that contains metal ions.

scholarly journals REMOVAL OF Pb2+ FROM AQUEOUS SOLUTION BY ADSORPTION ONTO COMPOSITE BASED ON EUCALYPTUS LEAF AND POLYANILINE

2017 ◽  
Vol 55 (1) ◽  
pp. 54
Author(s):  
Le Cao The ◽  
Vu Minh Tan ◽  
Phan Thi Binh
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Sem Images ◽  
Adsorption Data ◽  
Freundlich Adsorption Isotherm ◽  
Pseudo Second Order ◽  
Ir Analysis ◽  
Polymerization Method

Composite based on eucalyptus leaf and polyaniline (EL-PANi) was prepared by chemical polymerization method. It showed that the function groups belonging to polyaniline and eucalyptus leaf were found through IR analysis and the nanostructure of composite was explained by SEM images. The adsorption of  Pb2+ was carried out onto composite in aqueous solution via varying pH, contact time, and its initial concentration. The experimental adsorption data fitted well into Freundlich adsorption isotherm model (r2 = 0.9873). The adsorption process followed pseudo-second order kinetic with r2 = 0.9995. The maximum adsorption capacity of Pb2+ onto that composite was 172.4138 mg/g  by Langmuir equation and KF was 58.7527 mg/g by Freundlich one.

scholarly journals An Investigation into the Adsorption Characteristics of Grafted Mesoporous Silicates for the Removal of Tetramethyl Ammonium Hydroxide from Aqueous Solution

2002 ◽  
Vol 20 (8) ◽  
pp. 787-796 ◽  
Author(s):  
Brian P. Kelleher ◽  
Aidan M. Doyle ◽  
Benjamin K. Hodnett ◽  
Thomas F. O'Dwyer
Keyword(s):  
Aqueous Solution ◽  
Functional Groups ◽  
Pore Volume ◽  
Adsorption Process ◽  
Molecular Size ◽  
Ammonium Hydroxide ◽  
Surface Functional Groups ◽  
Mesoporous Silicates ◽  
Tetramethyl Ammonium ◽  
Tetramethyl Ammonium Hydroxide

Four cubic mesoporous silicates (CMS), one unmodified and three grafted with amine, carboxylic and cyano surface functional groups, were prepared, characterised and compared as adsorbents for tetramethyl ammonium hydroxide (TMAH) from aqueous solution. The adsorption process was studied as a function of molecular size and CMS pore volume. Sorption on the unmodified, cyano- and carboxylic-grafted adsorbents closely followed the Langmuir model while adsorption on the amine-treated silicate conformed to the Freundlich model. A comparison of the adsorbent pore volume and the volume of sorbed TMAH molecules suggested that monolayer sorption occurred, there being some evidence that surface functional groups influenced the adsorption process. The presence or absence of structural order, as defined by X-ray diffraction analysis, had no significant influence on the adsorption, as all materials, both ordered and disordered, had relatively high adsorption capacities.

Use of Natural Kaolinite Clay as an Adsorbent to Remove PB(II), CD(II), and CU(II) from Aqueous Solution

2014 ◽  
Vol 805 ◽  
pp. 581-584 ◽  
Author(s):  
Débora Martins Aragão ◽  
Maria de Lara P.M. Arguelho ◽  
Carolina Mangieri Oliveira Prado ◽  
José do Patrocinio Hora Alves
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Northeast Brazil ◽  
Order Kinetic ◽  
Kaolinite Clay ◽  
Adsorption Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Natural kaolinite clay collected in the State of Sergipe (northeast Brazil) was used as an adsorbent for the ions Pb2+, Cd2+, and Cu2+present in aqueous solution. Adsorption equilibrium was reached rapidly, enabling use of a contact time of 30 minutes, and maximum adsorption was achieved at pH 7.0. For all three metal ions, the adsorption data could be fitted using the Langmuir isotherm and the adsorption process obeyed a pseudo-second order kinetic model.

scholarly journals Cadmium and Lead Adsorption Capacities of Nigerian Ultisol Soil of Tropics

2019 ◽  
Vol 35 (3) ◽  
pp. 1004-1012 ◽  
Author(s):  
Henry Olumayowa Oluwasola ◽  
Jonnie Niyi Asegbeloyin ◽  
Alfred Ezinna Ochonogor ◽  
Julius Udeh Ani ◽  
Collins Ugochukwu Ibeji ◽  
...  
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Sorption Process ◽  
Maximum Adsorption Capacity ◽  
Lead Adsorption ◽  
Adsorption Capacities ◽  
Batch Technique ◽  
Pseudo Second Order ◽  
Cadmium And Lead ◽  
Kinetics Of

The study investigates the sorption of cadmium (Cd) and lead (Pb) by Nsukka urban soils, a Nigeria soil classified as an ultisol soil of tropics. Laboratory batch technique was utilized to investigate the effect of pH, temperature, contact time, and concentration on the adsorption process. Results showed that adsorption efficiency of the soils for Cd2+ and Pb2+ increased with increase in pH, temperature, and contact time but decreased with increase in concentration. The data from adsorption study was fitted to the Langmuir, Freundlich and Temkin adsorption isotherms, and results revealed that Langmuir isotherm fitted most satisfactorily. On the basis of the obtained maximum adsorption capacity (qmax) from the Langmuir model, the affinity of Cd and Pb for the studied soil was Pb2+ > Cd2+. Pseudo-second order (r2 ≥ 0.995-0.999) best described the kinetics of the sorption process for the metal ions in the soil.

scholarly journals Kinetics and Thermodynamics Studies of Copper(II) Adsorption onto Activated Carbon Prepared from Salacca zalacca Peel

Molekul ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 63
Author(s):  
Dewi Yuanita Lestari ◽  
Endang Widjajanti Laksono
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Metal Ion ◽  
Adsorption Process ◽  
Biogenic Carbon ◽  
Adsorption Data ◽  
Batch Technique ◽  
Langmuir Isotherm Model ◽  
G Value ◽  
Highly Porous

Highly porous and stable materials, such as alumina, silica, carbon, zeolite, and bentonite,  are well known and have been used as metal ion adsorbents. However, the use of biogenic carbon as adsorbent is relatively rare. The adsorption of copper(II) onto activated carbon extracted from Salcaca zalacca peel was studied. The effect of initial copper concentration, contact time, and a series temperature was studied. Adsorption was carried out in a batch technique. The adsorption equilibrium was reached after 60 minutes of contact time. The adsorption data had a better fitting line for the Langmuir isotherm model. The Langergren and also Ho and Mc Kay equations were used to predict the adsorption kinetics. The adsorption process obeyed a second-order kinetics model. The Thermodynamic parameters were ∆H°= -42.4180 kJ/mol; ∆S°= -0.0843 kJ/mol; ∆G°<0. These values indicated that the adsorption was exothermic and spontaneous. The low ∆G° value revealed that the main mechanism controlling the adsorption process was physisorption.

scholarly journals Study on Adsorption of Methylene Blue from Aqueous Solution by Biochar Derived from Mimosa Pigra Plant

2021 ◽  
Vol 37 (2) ◽  
Author(s):  
Nguyen Xuan Cuong
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Adsorption Process ◽  
Optimal Dose ◽  
Maximum Adsorption Capacity ◽  
Stable Period ◽  
Infrared Scanning ◽  
Mimosa Pigra ◽  
Adsorption Data ◽  
Physical And Chemical

Biochar from mimosa pigra was studied to remove methylene blue (MB) from aqueous solution. The properties of biochars were determined using Fourier Transform Infrared, scanning electron microscope, and Brunauer–Emmett–Teller. The biochar achieved the yield of 24.62 % at 500 oC pyrolysis. The specific surface area of ​​the biochar is 285.53 m2/g, the total pore size is 0.153 cm3/g and the ash content is 2.79%. The optimal dose of removing MB of the biochar is 5 g/L and the optimal pH is 2 - 10. MB removal reached over 80% in the first 30 min, followed by a stable period of 120 to 360 min reaching over 90% of removal. Maximum adsorption capacity reached 20.18 mg/g at 25 oC. MB adsorption data is suitable for kinetic models in order: Avrami > Elovich > PSO > PFO. The adsorption process may comprise physical and chemical adsorption andmultiple stages.  

scholarly journals Modification of Fishbone-Based Hydroxyapatite with MnFe2O4 for Efficient Adsorption of Cd(II) and Ni(II) from Aqueous Solution

2021 ◽  
Vol 21 (6) ◽  
pp. 1471
Author(s):  
Poedji Loekitowati Hariani ◽  
Addy Rachmat ◽  
Muhammad Said ◽  
Salni Salni
Keyword(s):  
Heat Treatment ◽  
Aqueous Solution ◽  
Adsorption Process ◽  
Fish Bones ◽  
Adsorption Capacities ◽  
Hydroxyapatite Composite ◽  
Bet Analysis ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Channa Striata

Due to their toxicity, Cd(II) and Ni(II) ions in the environment are severe. The hydroxyapatite composite was improved with magnetic MnFe2O4 to remove Cd(II) and Ni(II) ions from an aqueous solution. Hydroxyapatite was extracted from Snakehead (Channa striata) fish bones via alkaline-heat treatment. The hydroxyapatite/MnFe2O4 composite performance was analyzed through XRD, FTIR, SEM-EDS, BET analysis, and VSM, and the results reveal that the hydroxyapatite/MnFe2O4 composite shows good magnetic properties of 21.95 emu/g. The kinetics evaluation confirmed that the pseudo-second-order kinetics model was more suitable to describe the adsorption of Cd(II) and Ni(II) ions by hydroxyapatite/MnFe2O4 composite from the solution. The Langmuir isotherm model was suitable to describe the adsorption process of the Cd(II) and Ni(II)  ions, where the adsorption capacities for Cd(II) and Ni(II) are 54.3 and 47.4 mg/g, respectively. Desorption of Cd(II) and Ni(II) ions from hydroxyapatite/MnFe2O4 composite using NaCl as the eluent was more effective than EDTA. The findings of this study indicate that hydroxyapatite/MnFe2O4 can reduce Cd(II) and Ni(II) ions in wastewater so that it can recover natural resources.

The Research of Absorption on U(VI) by Nanometer α-Fe2O3 Microsphere

2014 ◽  
Vol 1010-1012 ◽  
pp. 817-820
Author(s):  
Qing Peng Wei ◽  
Shi You Li ◽  
Shui Bo Xie ◽  
Jian Biao Liao ◽  
Yin Li
Keyword(s):  
Adsorption Process ◽  
Removal Rate ◽  
Order Equation ◽  
Oxide Content ◽  
Solution Ph ◽  
Isothermal Adsorption ◽  
Adsorption Models ◽  
Adsorption Capacities ◽  
Adsorption Data ◽  
Pseudo Second Order

Adsorption of uranium(VI) ions by Sodium alginate (SA) immobilized nano-α-Fe2O3 particles beads were investigated in the batch experiments.The influences of the nano-ferric oxide content in beads，cross-linking time, solution pH, initial U(VI) concentration, temperature and contact time on U(VI) sorption were studied. The results indicated that the adsorption capacities are strongly affected by the solution pH, the best adsorption rate can be thought of to be at pH 3. The adsorption was rather fast in the initial 1.5 h, and the equilibrium was established in 9 h with the sorption capacity 2.64 mg/g. The kinetic adsorption data was simulated better by a pseudo-second-order equation. The removal rate increased slowly with temperature ascending . The adsorption process conformed to the Langmuir and Freundlich isothermal adsorption models, and the data fitted the latter better.

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