Alginate and alginate-zeolite beads for removal of cadmium present in water

MRS Advances ◽  
2020 ◽  
Vol 5 (62) ◽  
pp. 3247-3256
Author(s):  
I. Cosme-Torres ◽  
M.G. Macedo-Miranda ◽  
P. Ibarra-Escutia ◽  
M. Manjarrez-Olvera ◽  
V. Albíter-López ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Adsorption Isotherm ◽  
Adsorption Process ◽  
Isotherm Models ◽  
Effect Of Ph ◽  
Batch System ◽  
Eds Analysis ◽  
Kinetic And Isotherm Models

AbstractThe use of ALG beads and ALG-ZEO beads for the removal of Cd2+ was evaluated in a batch system, was determined the effect of pH, kinetics and adsorption isotherm. The characterization was carried out by FTIR, SEM and EDS. The EDS analysis showed that the main elements are C, O and Ca, these are associated with the chemical composition of alginate while the ALG-ZEO bead showed characteristic crystals of the zeolite. Cd2+ adsorption was carried out at pH 6 using ALG beads and ALG-ZEO beads as adsorbent. The suggested mechanism to explain the removal of the Cd2+ ion was is through a chemisorption process. Finally the adsorption process was adjusted to kinetic and isotherm models.

scholarly journals ADSORPTION OF GIBBERELLIC ACID ONTO NATURAL KAOLIN FROM TATAKAN, SOUTH KALIMANTAN

2010 ◽  
Vol 9 (3) ◽  
pp. 373-379 ◽  
Author(s):  
Sunardi Sunardi ◽  
Yateman Arryanto ◽  
Sutarno Sutarno
Keyword(s):  
Adsorption Isotherm ◽  
Gibberellic Acid ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Purification Process ◽  
X Ray ◽  
Langmuir Adsorption ◽  
Batch System

Adsorption of gibberellic acid (GA3) onto raw and purified kaolin from Tatakan, South Kalimantan was investigated in this study. Purification process was done by sedimentation to obtain relative pure kaolinite. Raw and purified kaolin samples were characterized by Fourier transformed infrared (FTIR) spectroscopy and X-ray diffractometer (XRD). The adsorption process was carried out in a batch system and the effect of pH, contact time and GA3 concentration were experimentally studied to evaluate the adsorption capacity. The amount of GA3 adsorbed was determined by UV spectrophotometer. The result showed that the raw kaolin from South Kalimantan consist of 53.36% kaolinite, 29.47% halloysite, 4.47% chlorite, 11.32% quartz and 1.38% christobalite and the purified kaolin consist of 73.03% kaolinite, 22.6% halloysite, 0.77% chlorite, 1.37% quartz and 2.23% christobalite Adsorption experimental indicate that the optimum adsorption took place at pH 7 and contact time for 4 h. Adsorption of GA3 was described by the Langmuir adsorption isotherm model with adsorption capacity of 8.91 mg/g on raw kaolin and 10.38 mg/g on purified kaolin.   Keywords: kaolin, gibberellic acid, adsorption

scholarly journals Removal of Lead (II) Ions from Aqueous Solutions onto Activated Carbon Derived from Waste Biomass

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Murat Erdem ◽  
Suat Ucar ◽  
Selhan Karagöz ◽  
Turgay Tay
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Waste Biomass ◽  
Eds Analysis ◽  
Monolayer Adsorption ◽  
Equilibrium Data ◽  
Pseudo Second Order

The removal of lead (II) ions from aqueous solutions was carried out using an activated carbon prepared from a waste biomass. The effects of various parameters such as pH, contact time, initial concentration of lead (II) ions, and temperature on the adsorption process were investigated. Energy Dispersive X-Ray Spectroscopy (EDS) analysis after adsorption reveals the accumulation of lead (II) ions onto activated carbon. The Langmuir and Freundlich isotherm models were applied to analyze equilibrium data. The maximum monolayer adsorption capacity of activated carbon was found to be 476.2 mg g−1. The kinetic data were evaluated and the pseudo-second-order equation provided the best correlation. Thermodynamic parameters suggest that the adsorption process is endothermic and spontaneous.

scholarly journals Using Modified Fly Ash for Removal of Heavy Metal Ions from Aqueous Solution

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Thuy Chinh Nguyen ◽  
Trang Do Mai Tran ◽  
Van Bay Dao ◽  
Quoc-Trung Vu ◽  
Trinh Duy Nguyen ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Fly Ash ◽  
Adsorption Isotherm ◽  
Metal Ion ◽  
Adsorption Process ◽  
Sodium Dodecyl ◽  
Isotherm Model ◽  
Isotherm Models ◽  
Adsorption Isotherm Models ◽  
Modified Fly Ash

This paper presents the characteristics of fly ash which was modified by 2-mercaptobenzothiazole (MBT) and sodium dodecyl sulfate (SDS) as the surfactants after treating with 1M NaOH solution. The change in morphology, specific surface area, crystal structure, and composition of the unmodified and modified fly ash was evaluated by FTIR, XRD, FESEM, BET, and EDX methods and techniques. The FTIR spectra of modified fly ash showed that there was no chemical reaction between the surfactants and fly ash. The XRD patterns and FESEM images indicated that modified fly ash had zeolite structure with a pore size of about 50 nm. Heavy metal ion adsorption behavior as well as adsorption isotherm models (Langmuir and Freundlich) of Cd2+ and Hg2+ ions of the unmodified and modified fly ash were also investigated and discussed. The amount of adsorbed ions of the modified fly ash was higher than that of the unmodified fly ash. The calculated results from the adsorption data according to the adsorption isotherm models of the above ions displayed that the Langmuir isotherm model was complied for the Cd2+ adsorption process while the Freundlich isotherm model was fitted for the Hg2+ adsorption process.

Comparative Adsorption Isotherm for Beryllium Oxide/Iron (III) Oxide Toward CO2 Adsorption and Desorption Studies

2020 ◽  
Vol 1010 ◽  
pp. 361-366
Author(s):  
Azizul Hakim Lahuri ◽  
Mohd Ambar Yarmo ◽  
Maratun Najiha Abu Tahari ◽  
Tengku Sharifah Marliza ◽  
Tengku Shafazila Tengku Saharuddin ◽  
...  
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Process ◽  
Co2 Adsorption ◽  
Freundlich Isotherm ◽  
Beryllium Oxide ◽  
Isotherm Models ◽  
Free Energy Of Adsorption ◽  
Adsorption And Desorption ◽  
Different Temperatures ◽  
Physical Phenomena

Surface modification of Fe2O3 by adding BeO was synthesized and calcined at different temperatures of 200-600 °C. The adsorbents were characterized by using XRD, N2 adsorption-desorption isotherm prior to performing CO2 adsorption and desorption studies. The CO2 adsorption data were analyzed using adsorption isotherm models such as Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich. BeO/Fe2O3-300 that calcined at 300 °C showed the most efficient adsorbent with physisorption and chemisorption were measured at 5.85 and 45.88 mg/g respectively. The CO2 adsorption notably best fitted with Freundlich isotherm with R2 = 0.9897 and calculated adsorption capacity closest to experimental data. This implies the CO2 adsorption process was governed by multilayer adsorption on the heterogeneous surface of the adsorbent. The mean free energy of adsorption (E=3.536 kJ/mol) from Dubinin-Radushkevich and heat of adsorption (bT=3.219 kJ/mol) from the Temkin model support that the adsorption process is physical phenomena.

MoS2Tio2 Mixture: A Modification Strategies of Tio2 Nanoparticles to Improve Photocatalytic Activity Under Visible Light

2020 ◽  
Vol 6 (3) ◽  
pp. 245-255 ◽  
Author(s):  
Sara Chahid ◽  
Rodrigo Alcantara ◽  
Desiree M. de los Santos
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Adsorption Isotherm ◽  
Kinetic Model ◽  
Contact Time ◽  
Adsorption Process ◽  
Freundlich Equation ◽  
Batch System ◽  
Equilibrium Data ◽  
Surface Modified

Background: Dyes are used in various sectors, such as the industry, textile, leather, and plastic industries, and part of these dyes is released in the environment via wastewater. Objective: The present study aimed to investigated the surface-modified TiO2 by MoS2 and Cu. Method: The effects of surface enhancement on as-prepared adsorbents on adsorption of Methylene Blue (MB) was were studied in a batch system by considering various parameters such as contact time, initial dye concentration and temperature. Result: The results show that the adsorption process was well fitted with the pseudo-firstorder kinetic model (R2 = 0.99). Further, the equilibrium data for the adsorption process have beenwere evaluated using Langmuir, Freundlich, and Temkin isotherms. Conclusion: The adsorption isotherm of MB onto as-prepared adsorbents nanoparticles fitted into the Freundlich equation.

scholarly journals Synthesis of Carbon Microparticles from Red Dragon Fruit (Hylocereus undatus) Peel Waste and Their Adsorption Isotherm Characteristics

Molekul ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 199
Author(s):  
Asep Bayu Dani Nandiyanto ◽  
Rina Maryanti ◽  
Meli Fiandini ◽  
Risti Ragadhita ◽  
Dian Usdiyana ◽  
...  
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Process ◽  
Milling Process ◽  
Isotherm Models ◽  
Sieve Analysis ◽  
Fruit Peel ◽  
Carbon Particles ◽  
Batch Type ◽  
Dragon Fruit ◽  
Hylocereus Undatus

This study aims to demonstrate the preparation of carbon microparticles obtained from red dragon fruit peel waste and their adsorption isotherm characteristics. The carbon microparticles were prepared by combining carbonization (at 250°C) and saw-milling process, and to get carbon microparticles with a specific size, sieve analysis was used. The adsorption isotherm was done by testing the adsorption ability of carbon microparticles with a specific size into curcumin solution in the batch-type reactor. The adsorption results were then compared to several standard isotherm models (i.e., Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models) for understanding what phenomena happen during the adsorption process. The adsorption analysis was also confirmed by testing several sizes of the carbon microparticles to predict the proposal mechanism in the adsorption process. The analysis results showed that the multilayer adsorption process occurs for all sizes in the micrometer range, and the process involves physical interactions between adsorbate and surface of adsorbent. The existence of multilayers is due to the possibility in the existence of porous structure in the carbon microparticles. This study is important for giving an alternative solution for reusable organic waste as well as supporting the fundamental researches in the further applications of carbon particles as catalyst and adsorbent.

Competitive adsorption of organic solvents using modified and unmodified calcium bentonite clay mineral

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Organic Solvents ◽  
Competitive Adsorption ◽  
Correlation Factor ◽  
Isotherm Model ◽  
Isotherm Models ◽  
High Concentration ◽  
Dual Purpose ◽  
Calcium Bentonite

Dodecyltrimethylammonium bromide (DTAB)–modified and unmodified calcium bentonite were both used for the competitive adsorption of aromatics (xylene, ethylbenzene and toluene) and petroleum products (gasoline, dual purpose kerosene and diesel) from their aqueous solution. Infrared spectroscopy (IR) and expansion tests (adsorption capacity and Foster swelling) measurement were performed in order to evaluate the performance of the adsorbents. The Foster swelling index and adsorption capacity of the DTAB modified calcium bentonite in the organic solvents follow the trend: xylene > ethylbenzene > toluene > gasoline > dual purpose kerosene (DPK) > diesel > water. However, the adsorption capacity of the adsorbent in diesel outweighed the adsorption capacity in DPK at high concentration of DTAB indicating that diesel has higher affinity for high DTAB concentration than DPK. The percentage removal of the solvent is directly proportional to the concentration of DTAB used in modifying the bentonite as well as the contact time between the adsorbent and the solvent, hence modified calcium bentonite adsorbed a higher percentage of organic solvents than the unmodified calcium bentonite. The adsorption characteristics of both adsorbents improved remarkably after proper agitation of the organic solvents, the unmodified calcium bentonite however adsorbed more water than the modified bentonite. Data obtained from adsorption isotherm models confirms that Freundlich adsorption isotherm model was favored more than Langmuir adsorption isotherm model with the correlation factor (R2) of the former tending more towards unity. The adsorption of ethylbenzene using DTAB modified and unmodified calcium bentonites follow a pseudo second order kinetics mechanism, suggesting that the rate determining step of adsorption involves both the adsorbent and the organic solvent.

scholarly journals Removal of Cadmium(II) from Water using Modified Citrus limettioides Peels: Thermodynamic and Isotherm Studies

2019 ◽  
Vol 32 (1) ◽  
pp. 73-78
Author(s):  
P. Janaki ◽  
R. Sudha ◽  
T.S. Sribharathi ◽  
P. Anitha ◽  
K. Poornima ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Low Cost ◽  
Raw Material ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Adsorption Method ◽  
Chemically Modified ◽  
Adsorption Performance ◽  
Monolayer Adsorption ◽  
Isotherm Equations

The adsorption performance of sulphuric acid treated low cost adsorbent synthesized by using Citrus limettioides peel as an effective raw material for the removal of cadmium(II) from water. The batch adsorption method was carried out to optimize some parameters like contact time, pH and adsorbent dose. The nonlinear isotherm equations were used to calculate the different isotherm constant of five isotherm models namely Freundlich, Langmuir, Dubinin-Radushkevich, Redlich-Peterson and Sips. The Langmuir monolayer adsorption capacity of chemically modified Citrus limettioides peel was found to be 287.60 mg g-1. The negative values of ΔGº and ΔHº showed that the adsorption process is spontaneous and exothermic.

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