Sorption of melanoidin onto surfactant modified zeolite

Melanoidin is responsible for the dark brown colour of distillery wastewater. Discharge of coloured wastewater has a major environmental impact on the biota of the receiving water body. Consequently, this study explores the removal of melanodin from aqueous solution. The equilibrium, kinetics and thermodynamics of melanoidin sorption are studied by varying initial solution pH, initial concentration, adsorbent dose and temperature. Kinetically, the melanoidin removal from solution by a surfactant modified zeolite is rapid and the amount adsorbed is dependent on pH, initial concentration, adsorbent dose and temperature. The equilibrium sorption data are fitted to the Freundlich and Langmuir models while the sorption, kinetics is described by the Ho pseudo-second order and Elovich models. The thermodynamic analysis indicates that the sorption is spontaneous and endothermic in nature. The FTIR spectra analyses show no new peaks or shift in peaks after sorption indicating that the melanoidin sorption may have occurred by a physical process. The results from desorption studies showed that melanoidin eluted back easily to the solution using distilled water which corroborates the physical sorption mechanism.

Download Full-text

Efficient removal of arsenic from water by dielectrophoresis-assisted adsorption

Water Science & Technology Water Supply ◽

10.2166/ws.2018.155 ◽

2018 ◽

Vol 19 (4) ◽

pp. 1066-1072

Author(s):

Q. H. Jin ◽

C. Y. Cui ◽

H. Y. Chen ◽

Y. Wang ◽

J. F. Geng ◽

...

Keyword(s):

Adsorption Capacity ◽

Removal Efficiency ◽

Solution Ph ◽

Residual Concentration ◽

Initial Concentration ◽

Weight Percentage ◽

Before And After ◽

High Concentrations ◽

Plant Ash ◽

Adsorbent Dose

Abstract Adsorption (ADS) and dielectrophoresis (DEP) techniques were combined (ADS/DEP) to efficiently remove As(V) in industrial wastewater. Fly ash, activated carbon, corncob and plant ash were tested to determine the best adsorbent by their adsorption capacity. Plant ash showed the highest adsorption capacity compared with the others. Different parameters such as solution pH and adsorbent dose were explored. The maximum As(V) removal efficiency was 91.4% at the optimized conditions (pH 9.0, adsorbent dose 5 g/L) when the initial concentration of As(V) was 15 mg/L. With the ADS/DEP technique, the plant ash particles with adsorbed As(V) were trapped on the electrodes in a DEP device. The ADS/DEP process could increase the removal efficiency of As(V) to 94.7% at 14 V even when the initial concentration of As(V) was 15 mg/L. And the residual concentration of As(V) decreased to 0.34 mg/L after two series of the ADS/DEP process. The adsorbents before and after DEP were examined by scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analysis. After the DEP process, the weight percentage of As(V) on the adsorbent surface increased to 0.96% from 0.5%. The ADS/DEP process could be a new efficient way to remove arsenic pollutant at high concentrations.

Download Full-text

Adsorption Study for the Removal of Nitrate from Water Using Local Clay

The Scientific World JOURNAL ◽

10.1155/2019/9529618 ◽

2019 ◽

Vol 2019 ◽

pp. 1-10 ◽

Cited By ~ 12

Author(s):

A. Battas ◽

A. El Gaidoumi ◽

A. Ksakas ◽

A. Kherbeche

Keyword(s):

Solution Concentration ◽

Optimal Conditions ◽

Batch Experiments ◽

X Ray Diffraction ◽

Local Clay ◽

Initial Concentration ◽

X Ray ◽

Rate Of Reaction ◽

Pseudo Second Order ◽

Adsorbent Dose

Our research aimed at the removal of nitrate ions through adsorption by local clay. A series of batch experiments were conducted to examine the effects of contact time, adsorbent characteristics, initial concentration of nitrate, pH of the solution, concentration, and granulometry of adsorbent. Adsorption isotherms studies indicated that local clay satisfies Freundlich’s model. The rate of reaction follows pseudo-second-order kinetics. Local clay successfully adsorbs nitrates at pH acid. The adsorption capacity under optimal conditions was found to be 5.1 mg/g. The adsorption yield increases with adsorbent dose and decrease with initial concentration of nitrate. The local clay was characterized by the X-ray fluorescence method (XRF), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), scanning electronics microscopy (SEM), and measurement of specific surface area (BET). The results of the study indicated that local clay is useful materials for the removal of nitrates from aqueous solutions which can be used in water treatment without any chemical modification.

Download Full-text

Removal of Strontium Ions from Aqueous Solution by Sunflower Straw

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.1922 ◽

2013 ◽

Vol 726-731 ◽

pp. 1922-1925 ◽

Cited By ~ 1

Author(s):

Lian Ai ◽

Xue Gang Luo ◽

Xiao Yan Lin ◽

Si Zhao Zhang

Keyword(s):

Aqueous Solution ◽

Batch Adsorption ◽

Order Model ◽

Solution Ph ◽

Sorption Data ◽

Freundlich Model ◽

Pseudo Second Order ◽

Ft Ir ◽

Sunflower Straw ◽

Langmuir And Freundlich Models

The sorptive potential of sunflower straw (≤125 μm) for Sr2+ from aqueous solution was evaluated. Batch adsorption experiments were carried out as a function of solution pH, adsorbent dosage, Sr2+ concentration and contact time. FT-IR spectra and SEM of sunflower straw were employed to explore the functional groups available for the binding of Sr2+ and morphology of the adsorbent. Maximum uptake capacity of sunflower straw was 17.48 mg/g occurred at around pH 3-7. The adsorption equilibrium can be achieved within 5 min and kinetic data were fitted well to pseudo-second-order model. The Langmuir and Freundlich models were applied to describe isotherm sorption data. The Langmuir model gave an acceptable fit than Freundlich model.

Download Full-text

Mass-transfer processes in the adsorption of crystal violet by activated carbon derived from pomegranate peels: Kinetics and thermodynamic studies

Journal of Engineered Fibers and Fabrics ◽

10.1177/1558925020919847 ◽

2020 ◽

Vol 15 ◽

pp. 155892502091984

Author(s):

Moussa Abbas ◽

Zahia Harrache ◽

Mohamed Trari

Keyword(s):

Activated Carbon ◽

Adsorption Capacity ◽

Crystal Violet ◽

Agitation Speed ◽

Second Order ◽

Point Of Zero Charge ◽

Order Kinetic ◽

Solution Ph ◽

Pseudo Second Order ◽

Adsorbent Dose

This study investigates the potential use of activated carbon, prepared from pomegranate peels, as an adsorbent activated using H3PO4 and its ability to remove crystal violet from an aqueous solution. The adsorbent was characterized by the Brunauer–Emmett–Teller method (specific surface area: 51.0674 m2 g−1) and point of zero charge (pHPZC = 5.2). However, some examined factors were found to have significant impacts on the adsorption capacity of activated carbon derived from pomegranate peels such as the initial dye concentration (5–15 mg L−1), solution pH (2–14), adsorbent dose (1–8 g L−1), agitation speed (100–700 r/min), and temperature (298–338 K). The best adsorption capacity was found at pH 11 with an adsorbent dose of 1 g L−1, an agitation speed at 400 r/min, and a contact time of 45 min. The adsorption mechanism of crystal violet onto activated carbon derived from pomegranate peels was studied using the pseudo-first-order, pseudo-second-order, Elovich, and Webber–Morris diffusion models. The adsorption kinetics were found to rather follow a pseudo-second order kinetic model with a determination coefficient ( R2) of 0.999. The equilibrium adsorption data for crystal violet adsorbed onto activated carbon derived from pomegranate peels were analyzed by the Langmuir, Freundlich, Elovich, and Temkin models. The results indicate that the Langmuir model provides the best correlation with qmax capacities of 23.26 and 76.92 mg g−1 at 27°C and 32°C, respectively. The adsorption isotherms at different temperatures have been used for the determination of thermodynamic parameters like the free energy, enthalpy, and entropy to predict the nature of adsorption process. The negative values Δ G0 (−5.221 to −1.571 kJ mol−1) and Δ H0 (−86.141 kJ mol−1) indicate that the overall adsorption is spontaneous and exothermic with a physisorption process. The adsorbent derived from pomegranate peels was found to be very effective and suitable for the removal of reactive dyes from aqueous solutions, due to its availability, low-cost preparation, and good adsorption capacity.

Download Full-text

The Adsorption Efficiency of Chemically Prepared Activated Carbon from Cola Nut Shells by on Methylene Blue

Journal of Chemistry ◽

10.1155/2013/469170 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 24

Author(s):

Julius Ndi Nsami ◽

Joseph Ketcha Mbadcam

Keyword(s):

Methylene Blue ◽

Activated Carbon ◽

Experimental Studies ◽

Isotherm Models ◽

Solution Ph ◽

Batch Mode ◽

Initial Concentration ◽

Adsorption Isotherm Models ◽

Pseudo Second Order ◽

Blue Solution

The adsorption of methylene blue from aqueous solution onto activated carbon prepared from cola nut shell has been investigated under batch mode. The influence of major parameters governing the efficiency of the process such as, solution pH, sorbent dose, initial concentration, and contact time on the removal process was investigated. The time-dependent experimental studies showed that the adsorption quantity of methylene blue increases with initial concentration and decreasing adsorbent dosage. The equilibrium time of 180 min was observed and maximum adsorption was favoured at pH 3.5. The dye removal using 0.1 g of adsorbent was more than 90%. This dosage (0.1 g) was considered as the optimum dosage to remove methylene blue from aqueous solutions. The equilibrium adsorption data were analyzed by the Freundlich, Langmuir adsorption isotherm models. The kinetics of methylene blue solution was discussed by pseudo-first-order, pseudo-second-order, and Elovich models. The adsorption process follows the Elovich rate kinetic model, having a correlation coefficient in the range between 0.9811 and 1.

Download Full-text

Sorption of Ammonium Ions onto Natural and Modified Egyptian Kaolinites: Kinetic and Equilibrium Studies

Advances in Physical Chemistry ◽

10.1155/2014/935854 ◽

2014 ◽

Vol 2014 ◽

pp. 1-12 ◽

Cited By ~ 4

Author(s):

Ola I. El-Shafey ◽

Nady A. Fathy ◽

Thoria A. El-Nabarawy

Keyword(s):

Surface Acidity ◽

Chemical Properties ◽

Intraparticle Diffusion ◽

Solution Ph ◽

Equilibrium Studies ◽

Sorption Data ◽

Thermally Activated ◽

Physical Sorption ◽

Pseudo Second Order ◽

Physical And Chemical

Thermally activated, acid-activated, and acid-leached of thermally activated kaolinites were prepared from the Egyptian ore. The physical and chemical properties were studied using N2 sorption at −196°C, FTIR, SEM, and the total surface acidity. The sorption of NH4+ ions on the investigated sorbents was controlled with the solution pH, sorbent dosage, and initial concentration of NH4+ solution. Kinetic and equilibrium NH4+ sorption at 30°C were employed. Four kinetic models were applied to the kinetic sorption data; pseudo-second-order, Elovich, and intraparticle diffusion models fitted well the kinetic data whereas pseudo-first-order model was less applicable. Elovich parameters refer to physical sorption type of NH4+ on nonuniform sites and the intraparticle diffusion controls the sorption of NH4+ by kaolinites to a small extent. The equilibrium sorption data followed Langmuir and D-R models; the negative value of ΔG indicates a spontaneous sorption and the mean sorption energy obtained shows also physical sorption. The sorption capacities of nonactivated and activated Egyptian kaolinites towards NH4+ sorption (10.87–45.45 mg·g−1) were good sorbents as compared with those uptaken by other clays reported in the literature and proved to be more active besides being less expensive and highly available.

Download Full-text

Removal of cadmium and lead from aqueous solutions using iron phosphate-modified pollen microspheres as adsorbents

REVIEWS ON ADVANCED MATERIALS SCIENCE ◽

10.1515/rams-2021-0035 ◽

2021 ◽

Vol 60 (1) ◽

pp. 365-376

Author(s):

Xiaoxing Zhang ◽

Hui Liu ◽

Jin Yang ◽

Li Zhang ◽

Binxia Cao ◽

...

Keyword(s):

Aqueous Solutions ◽

Adsorption Mechanism ◽

Iron Phosphate ◽

Sorption Kinetics ◽

Order Model ◽

Solution Ph ◽

Adsorption Capacities ◽

Removal Of Heavy Metals ◽

Pseudo Second Order ◽

Cadmium And Lead

Abstract Iron phosphate-modified pollen microspheres (pollen@FePO4) were prepared and applied as sorbents for the removal of heavy metals (Cd2+ and Pb2+) from the aqueous solution. Batch sorption studies were conducted to investigate the effects of solution pH, contact time, sorbent dosage, and metal concentration on the adsorption process. The sorption of Cd2+ and Pb2+ ions on pollen@FePO4 corresponds to the pseudo-second-order model and Langmuir isotherm, which is similar to the unmodified pollen. At pH 5.92, pollen@FePO4 offers maximum adsorption capacities of 4.623 and 61.35 mg·g−1 for Cd2+ and Pb2+, respectively. The faster sorption kinetics and higher adsorption capacities of Cd2+ and Pb2+ ions onto pollen@FePO4 than pollen indicates that it might be a promising material for the removal of heavy metal ions in aqueous solutions. The possible adsorption mechanism involves electrostatic and chemisorption for Cd2+ and mainly complexion for Pb2+.

Download Full-text

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

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2019-1585 ◽

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.

Download Full-text

Removal of lithium from water by aminomethylphosphonic acid-containing resin

Journal of the Serbian Chemical Society ◽

10.2298/jsc170930020c ◽

2018 ◽

Vol 83 (9) ◽

pp. 1059-1069 ◽

Cited By ~ 4

Author(s):

Aydin Çiçek ◽

Onur Yilmaz ◽

Özgür Arar

Keyword(s):

Chelating Resin ◽

Solution Temperature ◽

Order Kinetic ◽

Uptake Capacity ◽

Solution Ph ◽

Sorption Data ◽

Aminomethylphosphonic Acid ◽

Optimum Ph ◽

Order Kinetic Model ◽

Pseudo Second Order

This study gives an overview of the ability of aminomethylphosphonic acid containing chelating resin for the removal of lithium (Li+) from water. Studies were performed under various conditions such as resin dose, initial Li+ concentration, solution pH and solution temperature. Results showed that the sorption of Li+ reached equilibrium within 15 min and the experimental data were well fitted by the pseudo-second-order kinetic model. The Li+ sorption was highly pH dependent, and the optimum pH for Li+ removal was ?3. Isotherm sorption data displayed good correlation with the Langmuir model, and maximum monolayer sorption capacity of resin found as 13.65 mg/g. Thermodynamic studies suggested that Li+ sorption onto chelating resin was an exothermic and spontaneous process in nature. Resin can be regenerated by 0.1 M HCl, NaCl or H2SO4 with > 99 % efficiency. Desorption of Li+ with 0.1 M NaCl resulted in no changes of the uptake capacity through four subsequent sorption/desorption cycles

Download Full-text

Influence of the Surface Properties of the Bois Carré Seeds Activated Carbon for the Removal of Lead From Aqueous Ssolutions

Eurasian Chemico-Technological Journal ◽

10.18321/ectj115 ◽

2012 ◽

Vol 14 (3) ◽

pp. 201 ◽

Cited By ~ 9

Author(s):

L. Largitte ◽

S. Gervelas ◽

T. Tant ◽

P. Couespel Dumesnil ◽

P. Lodewyckx

Keyword(s):

Activated Carbon ◽

Surface Area ◽

Chemical Activation ◽

Acid Sites ◽

Second Order ◽

Equilibrium Studies ◽

Batch Mode ◽

Initial Concentration ◽

Pseudo Second Order ◽

Adsorbent Dose

An activated carbon from Bois carré (Citharexylum Fruticosum L.) seeds was prepared by chemical activation with phosphoric acid. The activated carbon obtained has a surface area of 594 m2/g and a high content of acid groups of 3.44 mmol.g-1. This carbon was studied for the removal of lead from water. Sorption studies were performed at 30 °C at different pH and adsorbent doses, in batch mode. Maximum adsorption occurred at pH 7 for an adsorbent dose of 1g/L. Kinetic studies, at the initial concentration of 150 mg/L of lead, pH 5 and an adsorbent dose of 1 g/L, yielded an equilibrium time of 30 h for this activated carbon. The kinetic data were modelled with the pseudo first order, the pseudo second order and the Bangham models. The pseudo second order model fitted the data well. The sorption rate constant (2.10-3 mol-1.Kg.s-1) and the maximum amount of lead adsorbed are quite good (0.18 mol.kg-1) compared to the data found in literature. Sorption equilibrium studies were conducted in a concentration range of lead from 0 to 150 mg/L, at pH 5, adsorbent dose 1 g/L. In an aqueous lead solution with an initial concentration of 30 mg/L, activated Bois carré seed carbon removed (at equilibrium) 48% of the heavy metal. The equilibrium data were modelled with the Langmuir and Freundlich equations, of which the latter gave the best fit. The Freundlich constants n (3.76 L.mol-1) and Kf (1.06 mol.kg-1) are in good agreement with literature. The Bois carré seed activated carbon is a very efficient carbon in terms of the metal amount adsorbed per unit of surface area (0. 06 m2/g). This good result is due to the presence of many active acid sites on the surface of this activated carbon.

Download Full-text