Adsorption Equilibrium of a Herbicide (Pendimethalin) onto Natural Clay

The equilibrium adsorption of a herbicide (pendimethalin) onto natural clay from aqueous solutions was studied experimentally using different system variables. The influence of such variables, such as particle size (dp), pH and temperature, on the adsorption capacity was studied. Equilibrium modelling was carried out using the Langmuir, Freundlich and Redlich—Peterson models with the corresponding constants being calculated for the different system variables. The results indicate that the maximum adsorption capacity (qmax) at an acidic pH value (3.44) was approximately double that observed at an alkaline pH value (9.62). It was also found that the effect of particle size was significant and that the temperature plays an interesting role in the adsorption process. The enthalpy change (ΔH) for adsorption was evaluated as −29.36 kJ/mol. It is clear from the results of this study that the Freundlich model fitted the experimental adsorption data significantly better than the Langmuir or the Redlich—Peterson models.

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Adsorption kinetics and thermodynamics of acid Bordeaux B from aqueous solution by graphene oxide/PAMAMs

Water Science & Technology ◽

10.2166/wst.2015.328 ◽

2015 ◽

Vol 72 (7) ◽

pp. 1217-1225 ◽

Cited By ~ 6

Author(s):

Fan Zhang ◽

Shengfu He ◽

Chen Zhang ◽

Zhiyuan Peng

Keyword(s):

Graphene Oxide ◽

Adsorption Capacity ◽

Ph Value ◽

Maximum Adsorption Capacity ◽

Freundlich Model ◽

Equilibrium Data ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Effects Of Media ◽

Better Than

Graphene oxide/polyamidoamines dendrimers (GO/PAMAMs) composites were synthesized via modifying GO with 2.0 G PAMAM. The adsorption behavior of the GO/PAMAMs for acid Bordeaux B (ABB) was studied and the effects of media pH, adsorption time and initial ABB concentration on adsorption capacity of the adsorbent were investigated. The optimum pH value of the adsorption of ABB onto GO/PAMAMs was 2.5. The maximum adsorption capacity increased from 325.78 to 520.83 mg/g with the increase in temperature from 298 to 328 K. The equilibrium data followed the Langmuir isotherm model better than the Freundlich model. The kinetic study illustrated that the adsorption of ABB onto GO/PAMAMs fit the pseudo-second-order model. The thermodynamic parameters indicated that the adsorption process was physisorption, and also an endothermic and spontaneous process.

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Preparation of Poly (Acrylic Acid-Acrylamide/Starch) Composite and Its Adsorption Properties for Mercury (II)

Materials ◽

10.3390/ma14123277 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3277

Author(s):

Wenjuan Zhu ◽

Zhiyong Yang ◽

Akram Yasin ◽

Yanxia Liu ◽

Letao Zhang

Keyword(s):

Particle Size ◽

Acrylic Acid ◽

Adsorption Capacity ◽

Graft Copolymer ◽

Ph Value ◽

Adsorption Properties ◽

Size Exclusion ◽

Narrow Particle Size Distribution ◽

Maximum Adsorption Capacity ◽

Poly Acrylic Acid

The poly (acrylic acid-acrylamide/starch) composite was synthesized by solution polymerization, aiming to adsorb mercury (II) in water. The resulted copolymer was characterized by particle size exclusion chromatography (SEC), Fourier transform infrared spectroscopy (FTIR), thermogravimetry (TG), scanning electron microscopy (SEM) and dynamic light scattering particle size analyzer (DLS). It turned out that starch was successfully incorporated with the macromolecular polymer matrix and played a key role for improving the performance of the composites. These characterization results showed that the graft copolymer exhibited narrow molecular weight distribution, rough but uniform morphology, good thermal stability and narrow particle size distribution. The graft copolymer was used to remove Hg(II) ions from aqueous solution. The effects of contact time, pH value, initial mercury (II) concentration and temperature on the adsorption capacity of Hg(II) ions were researched. It was found that after 120 min of interaction, poly (acrylic acid-acrylamide/starch) composite achieved the maximum adsorption capacity of 19.23 mg·g−1 to Hg(II) ions with initial concentration of 15 mg·L−1, pH of 5.5 at 45 °C. Compared with other studies with the same purpose, the composites synthesized in this study present high adsorption properties for Hg(II) ion in dilute solution. The adsorption kinetics of Hg(II) on the poly (acrylic acid-acrylamide/starch) composite fits well with the pseudo second order model.

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Adsorption of Diazo Dye C.I. Acid Red 97 from Aqueous Solution onto Yemen Natural Clay: Equilibrium and Thermodynamic Studies

JORDANIAN JOURNAL OF ENGINEERING AND CHEMICAL INDUSTRIES (JJECI) ◽

10.48103/jjeci12018/ ◽

2018 ◽

pp. 1-11

Author(s):

Abdulrakib Al-Wahbi

Keyword(s):

Particle Size ◽

Adsorption Capacity ◽

Size Range ◽

Physical Adsorption ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Standard Entropy ◽

Natural Clay ◽

Particle Size Range ◽

Diazo Dye

The equilibrium adsorption of diazo dye C.I. Acid Red 97 (AR97) from aqueous solutions onto Yemen natural clay has been studied as a function of temperature and particle size range. The equilibrium data were correlated using Langmuir, Fruendlich, Temkin, Redlich-Peterson, and Sips isotherm models. Thermodynamic parameters such as standard enthalpy (ΔHº), standard entropy (ΔSº) and standard Gibbs free energy (ΔGº) were calculated. It was found that the adsorption capacity of clay for AR97 decreases with increasing temperature and particle size range. The results show that Fruendlich and Sips isotherm models best fit the experimental data over the whole concentration range. The maximum adsorption capacity for Yemen natural clay was 196.7 (mg.g-1 ). The value of ΔHº was -20.5 (kJ.g-mol−1) indicating that the adsorption of AR79 onto Yemen natural clay is characterized by physical adsorption. ΔGº values obtained were all negatives indicating a spontaneous adsorption process

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Adsorption of Zn(II) in Aqueous Solutions by Kaolin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.554-556.2041 ◽

2012 ◽

Vol 554-556 ◽

pp. 2041-2044

Author(s):

Jun Jin Chen ◽

Guo Xiang Pan ◽

Yan Fei Yu

Keyword(s):

Kinetic Equation ◽

Adsorption Capacity ◽

Ph Value ◽

Model Fitting ◽

Order Kinetic ◽

Freundlich Model ◽

Initial Ph ◽

Higher Temperature ◽

Better Than ◽

Adsorption Activation Energy

In this paper, adsorption performance of Zn(II) in simulative waste water by kaolin was studied, and the influences of solution initial pH value, temperature, adsorption time, concentration of Zn(II) were tested. Moreover, the thermodynamic parameters and kinetic equation were calculated. The results show that Zn(II) adsorption capacity firstly increases and then decreases as the pH increases, and the higher temperature, the better adsorption capacity. The Zn(II) adsorption occurs mainly within 60 minutes, and then leveling off. The calculations show that linear correlation coefficient (R2) of langmuir equation is better than the freundlich model fitting results, and Zn(II) adsorption can occur spontaneously, is an endothermic and entropy increasing process. In addition, first-order kinetic equation is more suitable for the description of Zn(II) adsorption mechanism, and adsorption activation energy equals 21.51 kJ•mol-1.

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Adsorption Studies of Nickel(II) Metal Ions Uptake Using Fe3O4 Magnetic Nanoadsorbent

Jurnal Teknologi ◽

10.11113/jt.v71.3864 ◽

2014 ◽

Vol 71 (5) ◽

Author(s):

Layth Imad Abd Ali ◽

Wan Aini Wan Ibrahima ◽

Azli Sulaiman ◽

Mohd Marsin Sanagi

Keyword(s):

Adsorption Capacity ◽

Ph Value ◽

Precipitation Method ◽

Maximum Adsorption Capacity ◽

Freundlich Model ◽

Adsorption Affinity ◽

Kinetic Rates ◽

Pseudo Second Order ◽

Co Precipitation ◽

Langmuir And Freundlich Equations

In the present study, Fe3O4 magnetic nanoparticles (MNPs) synthesized in-housed using co-precipitation method was applied for the treatment of aqueous solutions contaminated by Ni(II) ions. Experimental results indicated that at 25ºC, the optimum pH value for Ni(II) removal was pH 6.0 and an adsorbent dose of 60.0 mg. The adsorption capacity of Fe3O4 nanoparticles for Ni(II) is 20.54 mg g−1. Adsorption kinetic rates were found to be fast; total equilibrium was achieved after 180 min. Kinetic experimental data fitted very well the pseudo-second order equation and the value of adsorption rate constants was calculated to be 0.004 and 0.0008 g mg−1 min at 5 and 40 mg L−1 initial Ni(II) concentrations, respectively. The equilibrium isotherms were evaluated in terms of maximum adsorption capacity and adsorption affinity by the application of Langmuir and Freundlich equations. The maximum monolayer capacity obtained from the Langmuir isotherm was 24.57 mg g−1 for Ni(II). Results indicate that the Langmuir model fits adsorption isotherm data better than the Freundlich model.

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Synthesis of Lignin-Base Bead Adsorbent and its Application in Removing Pb (II) from Aqueous Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.391-392.773 ◽

2011 ◽

Vol 391-392 ◽

pp. 773-777 ◽

Cited By ~ 1

Author(s):

Ya Ling Huang ◽

Ru Lin Fu ◽

Zhen Kun Huang ◽

Xian Su Cheng

Keyword(s):

Electron Microscopy ◽

Aqueous Solution ◽

Adsorption Capacity ◽

Ph Value ◽

Maximum Adsorption Capacity ◽

Condensation Polymerization ◽

High Concentration ◽

Modified Lignin ◽

Scanning Electron ◽

Better Than

A spherical amine modified lignin-base adsorbent had been prepared (L-BAA) by condensation polymerization of lignin with epoxy chloropropane and diamines. The modified products were characterized by FTIR spectra and scanning electron microscopy. Few researches on adsorbing Pb (II) of high concentration from aqueous had been reported. The spherical lignin-base adsorbent was used to adsorb Pb (II) of high concentration from aqueous solution. The effect of shaking time, pH value and temperature on adsorption had been investigated in the study. It was indicated that the adsorption was dependent on pH and temperature of Pb (II) aqueous solution. The maximum adsorption capacity was 151.0 mg/g at follow condition: pH value was 4.00 and temperature was 35°C. The adsorption capacity was better than other reported adsorbents.

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Utilization of Waste of Enzymes Biomass as Biosorbent for the Removal of Dyes from Aqueous Solution in Batch and Fluidized Bed Column

Revista de Chimie ◽

10.37358/rc.20.1.7804 ◽

2020 ◽

Vol 71 (1) ◽

pp. 1-12

Author(s):

Salman H. Abbas ◽

Younis M. Younis ◽

Mohammed K. Hussain ◽

Firas Hashim Kamar ◽

Gheorghe Nechifor ◽

...

Keyword(s):

Experimental Data ◽

Aqueous Solution ◽

Particle Size ◽

Adsorption Capacity ◽

Fluidized Bed ◽

Flow Rate ◽

Fungal Biomass ◽

Solution Flow Rate ◽

Maximum Adsorption Capacity ◽

Solution Flow

The biosorption performance of both batch and liquid-solid fluidized bed operations of dead fungal biomass type (Agaricusbisporus ) for removal of methylene blue from aqueous solution was investigated. In batch system, the adsorption capacity and removal efficiency of dead fungal biomass were evaluated. In fluidized bed system, the experiments were conducted to study the effects of important parameters such as particle size (701-1400�m), initial dye concentration(10-100 mg/L), bed depth (5-15 cm) and solution flow rate (5-20 ml/min) on breakthrough curves. In batch method, the experimental data was modeled using several models (Langmuir,Freundlich, Temkin and Dubinin-Radushkviechmodels) to study equilibrium isotherms, the experimental data followed Langmuir model and the results showed that the maximum adsorption capacity obtained was (28.90, 24.15, 21.23 mg/g) at mean particle size (0.786, 0.935, 1.280 mm) respectively. In Fluidized-bed method, the results show that the total ion uptake and the overall capacity will be decreased with increasing flow rate and increased with increasing initial concentrations, bed depth and decreasing particle size.

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Adsorption of Methylene Blue from Aqueous Solution Using Honeycomb-Cinder

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.2259 ◽

2012 ◽

Vol 550-553 ◽

pp. 2259-2262

Author(s):

Song Bo Cui ◽

Hua Yong Zhang ◽

Lu Yi Zhang

Keyword(s):

Methylene Blue ◽

Adsorption Capacity ◽

Ph Value ◽

Dye Wastewater ◽

Batch System ◽

Adsorption Data ◽

Adsorption Processes ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Mb Adsorption

The adsorption behavior of methylene blue (MB) dye from aqueous solutions onto honeycomb-cinder (HC) and its acid-activated product was investigated in a batch system. The results showed the adsorption capacity was decreased for raw HC samples with the increase of pH value, while it was increased for activated samples. The adsorption data were fit with Langmuir isotherm model for MB adsorption by all samples. The MB adsorption capacity on samples was increased from 2.62 mg/g to 7.81 mg/g and 7.00 mg/g after acid-activated by HCl and H2SO4, respectively. The adsorption processes of MB followed pseudo-second-order kinetics with a coefficient of correlation≥0.99. This study demonstrated that acid-activated HC has superior adsorbing ability for MB than raw HC and can be used as alternative adsorbents in dye wastewater treatment.

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The use of hollow sphere pigments as strength additives in paper and paperboard coatings—Part 1: The predictive nature of packing models on coating properties

TAPPI Journal ◽

10.32964/tj19.11.585 ◽

2020 ◽

Vol 19 (11) ◽

pp. 585-593

Author(s):

ETHAN GLOR ◽

BRIAN EINSLA ◽

JOHN ROPER ◽

JIAN YANG ◽

VALERIY GINZBURG

Keyword(s):

Particle Size ◽

Hollow Sphere ◽

Particle Packing ◽

Particle Sizes ◽

Coating Properties ◽

Ideal System ◽

Thermal Paper ◽

Effect Of Particle Size ◽

Low Levels ◽

Better Than

Hollow sphere pigments (HSPs) are widely used at low levels in coated paper to increase coating bulk and to provide gloss to the final sheet. However, HSPs also provide an ideal system through which one can examine the effect of pigment size and particle packing within a coating due to their unimodal and tunable particle sizes. The work presented in Part 1 and Part 2 of this study will discuss the use of blends of traditional inorganic pigments and HSPs in coating formulations across a variety of applications for improved coating strength. Part 1 of this study focuses on the theory of bimodal spherical packing and demonstrates the predictive nature of packing models on the properties of coating systems containing HSPs of two different sizes. This study also examines conditions where the model fails by examining the effect of particle size on coating strength in sytems like thermal paper basecoats where the non-HSP component has a broad particle size distribution, and how these surprising trends can be used to generate better-than-expected thermal printing performance in systems with low HSP/clay ratios. Part 2 of this study focuses on the incorporation of HSPs of different particle sizes into paperboard formulations to affect coating strength and opacity.

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Karekterisasi, Kinetika, dan Isoterm Adsorpsi Limbah Ampas Kelapa sebagai Adsorben Ion Cu(II)

SAINTIFIK ◽

10.31605/saintifik.v6i2.265 ◽

2020 ◽

Vol 6 (2) ◽

pp. 104-115

Author(s):

Agusriyadin Agusriyadin

Keyword(s):

Adsorption Capacity ◽

Ph Effect ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Optimum Conditions ◽

Langmuir Adsorption ◽

Adsorbent Surface ◽

Adsorption Data ◽

Order Kinetic Model ◽

Pseudo Second Order

Penelitian ini bertujuan untuk menguji kemampuan AK dan AKPM dalam mengadsorpsi ion Cu (II), pengaruh parameter adsorpsi dan mekanisme adsorpsi. AK dan AKP Madsorben dibuat dari residu ampas kelapa. Adsorben dikarakterisasi dengan FTIR, SEM dan EDS. Pengaruh parameter adsorpsi seperti pH awal, dosis adsorben, waktu kontak dan konsentrasi ion Cu (II) awal diperiksa untuk menentukan kondisi optimum serapan tembaga (II). Ion Cu (II) yang teradsorpsi diukur berdasarkan pada konsentrasi Ion Cu (II) sebelum dan sesudah adsorpsi menggunakan metode AAS. Hasil karakterisasi menunjukkan bahwa struktur pori dan gugus fungsi tersedia pada permukaan adsorben. Menurut percobaan efek pH, kapasitas adsorpsi maksimum dicapai pada pH 7. Waktu kontak optimal dan konsentrasi tembaga awal (II) ditemukan masing-masing pada 120 menit dan 100 mg L-1. Data eksperimental sesuai dengan model kinetik orde dua orde dua, dan Langmuir isoterm adsorpsi yang diperoleh paling sesuai dengan data adsorpsi. Kapasitas adsorpsi maksimum adsorben ditemukan menjadi 4,73 dan 6,46 mg g-1 pada kondisi optimal. The results of characterization showed that the pore structure and the functional groups were available on adsorbent surface. According to the pH effect experiments, the maximum adsorption capacity was achieved at pH 7. Optimum contact time and initial copper(II) concentration were found at 120 min and 100 mg L-1, respectively. The experimental data were comply with the pseudo-second-order kinetic model, and Langmuir adsorption isotherm obtained best fitted the adsorption data. The maximum adsorption capacity of the adsorbents was found to be 4.73 and 6.46 mg g-1 at optimum conditions.

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