Enhancement of the Adsorption of Co(II) and Ni(II) Ions onto Peanut Hulls through Esterification Using Citric Acid

Peanut hulls were modified chemically by esterification with citric acid under conditions which yielded hulls rich in carboxyl content. The esterified products thus obtained were used in the removal of Co(II) and Ni(II) ions from aqueous solutions. The factors affecting the esterification reaction and the adsorption of the metal cations onto the peanut hulls before and after esterification were thoroughly investigated. The results obtained highlighted the following conclusions. The optimum conditions for esterification involve the treatment of peanut hulls (1 g) with 12.4 mmol citric acid in the presence of a very small amount of water for 2 h at 140°C. Similarly, the optimum pH for the adsorption of cobalt(II) ions onto the peanut hulls citrate was 7.0. The adsorption capacity, qe (mg/g), of Co(II) ions onto the peanut hulls citrate increased on increasing the extent of esterification, expressed as mequiv. —COOH/100 g sample. The maximum values for the adsorption capacity, qmax, were 28.7 mg/g and 270.3 mg/g on native and peanut hulls citrate, respectively. The qmax values for of Ni(II) ion adsorption were 5 mg/g and 175.4 mg/g on native and peanut hulls citrate, respectively. The equilibrium data were well fitted by the Langmuir and Freundlich adsorption models and showed the large capacity of peanut hulls citrate in the removal of Co(II) and Ni(II) ions from aqueous solutions.

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Adsorption Evaluation for the Removal of Nickel, Mercury, and Barium Ions From Single-Component and Mixtures of Aqueous Solutions by Using an Optimized Biobased Chitosan Derivative

Polymers ◽

10.3390/polym13020232 ◽

2021 ◽

Vol 13 (2) ◽

pp. 232

Author(s):

Efstathios V. Liakos ◽

Mariza Mone ◽

Dimitra A. Lambropoulou ◽

Dimitrios N. Bikiaris ◽

George Z. Kyzas

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Single Component ◽

Chitosan Derivative ◽

Barium Ions ◽

Hydroxymethyl Furfural ◽

Before And After ◽

Equilibrium Data ◽

Best Fitting

In this experimental study, the use of 5-hydroxymethyl-furfural (HMF) organic compound as a grafting agent to chitosan natural polymer (CS) was examined. One optimized chitosan derivative was synthesized, and then tested (CS-HMF), in order to uptake nickel, mercury, and barium metal ions from single- and triple-component (multi-component) aqueous solutions. The characterization of the material before and after the metal uptake was achieved by scanning electron microscopy (SEM). The ability of the adsorption of CS-HMF was tested at pH = 6. The adjusting of temperature from 25 to 65 °C caused the increase in the adsorption capacity. The equilibrium data were fitted to the models of Langmuir and Freundlich, while the data from kinetic experiments were fitted to pseudo-1st and pseudo-2nd order models. The best fitting was achieved for the Langmuir model (higher R2). The adsorption capacity for nickel, mercury, and barium removal at 25 °C (single component) was 147, 107, and 64 (mg/g), respectively. However, the total adsorption capacity for the multi-component was 204 mg/g. A thermodynamic study was also done, and the values of ΔG0, ΔH0, and ΔS0 were evaluated.

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Sorption of Bisphenol A in Aqueous Solutions on Irradiated and as-Grown Multiwalled Carbon Nanotubes

Revista de Chimie ◽

10.37358/rc.18.5.6297 ◽

2018 ◽

Vol 69 (5) ◽

pp. 1233-1239

Author(s):

Raluca Madalina Senin ◽

Ion Ion ◽

Ovidiu Oprea ◽

Rusandica Stoica ◽

Rodica Ganea ◽

...

Keyword(s):

Carbon Nanotubes ◽

Bisphenol A ◽

Aqueous Solutions ◽

Adsorption Capacity ◽

Multiwalled Carbon Nanotubes ◽

Adsorption Process ◽

Sorption Process ◽

Multiwalled Carbon ◽

Before And After ◽

Kinetic Sorption

In this study, non-irradiated and weathered multiwalled carbon nanotubes (MWCNTs) obtained through irradiation, were studied as adsorbents for BPA, both nanomaterials being characterized before and after the adsorption process. The objectives of our investigation were to compare the characteristics of non-irradiated and irradiated MWCNTs, to evaluate the adsorption capacity of BPA by pristine and irradiated MWCNTs and to determine the variation of the kinetic, sorption and thermodynamic parameters during sorption process using both sorbents.

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Cyclodextrin modified filter paper for removal of cationic dyes/Cu ions from aqueous solutions

Water Science & Technology ◽

10.2166/wst.2019.009 ◽

2018 ◽

Vol 78 (12) ◽

pp. 2553-2563 ◽

Cited By ~ 14

Author(s):

Yaoyue Li ◽

Yanbo Zhou ◽

Yi Zhou ◽

Juying Lei ◽

Shengyan Pu

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Filter Paper ◽

Textile Industry ◽

High Efficiency ◽

National Standard ◽

Esterification Reaction ◽

Dynamic Adsorption ◽

Pseudo Second Order ◽

Cu Ions

Abstract A filter paper was functionalized with β-cyclodextrin and citric acid via esterification reaction for the removal of dyes and Cu ions from aqueous solutions. The adsorption capacity and removal performance of the modified filter paper (MFP) was investigated using static and dynamic adsorption experiments. The static adsorption data fit well the Langmuir and pseudo-second-order models, and the adsorption capacity of Methylene Blue (MB), Brilliant Green (BG), Rhodamine-B (RB) and Cu(II) over the MFP were 124.6 mg/g, 130.4 mg/g, 99.7 mg/g and 39.1 mg/g, respectively, which are much higher than the unmodified filter paper (below 2 mg/g). Even better, the decolorization performance and Cu(II) removal of MFP are remarkable in dynamic adsorption. The effluent can reach the National Standard for dyeing and finishing of textile industry of China after three cycles in a continuous filtration-adsorption system. This method provides a new pathway to achieve high efficiency removal of dyes and metal ions from wastewater.

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Chitosan Grafted with Biobased 5-Hydroxymethyl-Furfural as Adsorbent for Copper and Cadmium Ions Removal

Polymers ◽

10.3390/polym12051173 ◽

2020 ◽

Vol 12 (5) ◽

pp. 1173 ◽

Cited By ~ 1

Author(s):

Mariza Mone ◽

Dimitra A. Lambropoulou ◽

Dimitrios N. Bikiaris ◽

George Kyzas

Keyword(s):

Adsorption Capacity ◽

Significant Loss ◽

X Ray Diffraction ◽

Freundlich Model ◽

Hydroxymethyl Furfural ◽

Before And After ◽

Equilibrium Data ◽

Best Fitting ◽

Pseudo Second Order ◽

Grafting From

This work investigates the application of 5-hydroxymethyl-furfural (HMF) as a grafting agent to chitosan (CS). The material produced was further modified by cross-linking. Three different derivatives were tested with molecular ratios CS/HMF of 1:1 (CS-HMF1), 2:1 (CS-HMF2) and 10:1 mol/mol (CS-HMF3)) to remove Cu2+ and Cd2+ from aqueous solutions. CS-HMF derivatives were characterized both before, and after, metal ions adsorption by using scanning electron microscopy (SEM), as well as Fourier-transform infrared (FTIR) spectroscopy thermogravimetric analysis (TGA), and X-Ray diffraction analysis (XRD). The CS-HMF derivatives were tested at pH = 5 and showed higher adsorption capacity with the increase of temperature. Also, the equilibrium data were fitted to Langmuir (best fitting) and Freundlich model, while the kinetic data to pseudo-first (best fitting) and pseudo-second order equations. The Langmuir model fitted better (higher R2) the equilibrium data than the Freundlich equation. By increasing the HMF grafting from 130% (CS-HMF1) to 310% (CS-HMF3), an increase of 24% (26 m/g) was observed for Cu2+ adsorption and 19% (20 mg/g) for Cd2+. By increasing from T = 25 to 65 °C, an increase of the adsorption capacity (metal uptake) was observed. Ten reuse cycles were successfully carried out without significant loss of adsorption ability. The reuse potential was higher of Cd2+, but more stable desorption reuse ability during all cycles for Cu2+.

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Biosorption of Cu2+ from Aqueous Solutions Using NaOH-Modified Fir Sawdust

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.1827 ◽

2013 ◽

Vol 726-731 ◽

pp. 1827-1832

Author(s):

Hong Mei Deng ◽

Yong Heng Chen ◽

Cui Qin Wu ◽

Xue Xia Huang ◽

Tao Liu

Keyword(s):

Aqueous Solutions ◽

Adsorption Process ◽

Low Cost ◽

Freundlich Isotherm ◽

Factors Affecting ◽

Langmuir Adsorption ◽

Adsorption Processes ◽

Equilibrium Data ◽

Pseudo Second Order ◽

Agricultural Material

Fir sawdust, a low-cost residual agricultural material, was used as adsorbent for the removal of Cu2+from aqueous solutions. Factors affecting the adsorption behavior of Cu2+, such as pH, initial metal concentration, contact time and temperature, have been carried out. The Cu2+removal was pH-dependent, reaching a maximum at pH 5. The adsorption capacity of the fir sawdust from Langmuir adsorption isotherm was 38.6 mg/g at 25°C. The adsorption process followed pseudo-second-order kinetics. The equilibrium data fitted very well to the Freundlich isotherm. The negative ΔGovalues at various temperatures confirm that the adsorption processes are spontaneous.

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Greenhouse Crop Residue and Its Derived Biochar: Potential as Adsorbent of Cobalt from Aqueous Solutions

Water ◽

10.3390/w12051282 ◽

2020 ◽

Vol 12 (5) ◽

pp. 1282 ◽

Cited By ~ 3

Author(s):

Irene Iáñez-Rodríguez ◽

Mónica Calero ◽

Gabriel Blázquez ◽

María Ángeles Martín-Lara

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Crop Residue ◽

Pyrolysis Temperature ◽

Low Cost ◽

Treatment Temperature ◽

Cobalt Removal ◽

Equilibrium Data ◽

Different Temperatures ◽

And Behavior

This work is focused on the removal of cobalt from aqueous solutions using the greenhouse crop residue and biochars resulting from its pyrolysis at different temperatures, which have not been previously used for this purpose. This study aims to provide insights into the effect of pyrolysis temperature as a key parameter on the cobalt adsorption capacity of these materials. Firstly, the main physicochemical properties of greenhouse crop residue and its biochars prepared under different pyrolysis temperatures were characterized by elemental analysis and FT-IR, among others. Then, the cobalt adsorption capacity of materials was evaluated in batch systems. The best results were obtained for the biochar prepared by pyrolysis at 450 °C (adsorption capacity of 28 mg/g). Generally, the adsorption capacity of the materials increased with pyrolysis temperature. However, when the treatment temperature was increased up to 550 °C, a biochar with worse properties and behavior than cobalt adsorbent was produced. Rather than surface area and other physical properties, functional groups were found to influence cobalt adsorption onto the prepared materials. The adsorption kinetics showed that the adsorption followed pseudo-second-order kinetics model. The obtained equilibrium data were fitted better by the Langmuir model rather than the Freundlich model. Finally, decomposition of loaded-materials was analyzed to assess their possible recycling as fuel materials. The study suggested that greenhouse crop residue can be used as a low-cost alternative adsorbent for cobalt removal from aqueous solutions.

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ADSORPTION OF FOOD COLORING ALLURA RED DYE (E129) FROM AQUEOUS SOLUTIONS USING ACTIVATED CARBON

International Journal of Food and Allied Sciences ◽

10.21620/ijfaas.2017110-26 ◽

2017 ◽

Vol 3 (1) ◽

pp. 10 ◽

Cited By ~ 2

Author(s):

Saad A Alkahtani ◽

Samer S Abu-Alrub ◽

Ashraf M Mahmoud

Keyword(s):

Activated Carbon ◽

Aqueous Solutions ◽

Adsorption Capacity ◽

Kinetic Models ◽

Freundlich Isotherm ◽

Second Order ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Factors Affecting ◽

Allura Red

The adsorption behavior of Allura red (E129) from aqueous solutions onto activated carbon was successfully investigated. All factors affecting the adsorption process were carefully studied and the conditions were optimized. Adsorption of E129 onto activated carbon was found to increase by decreasing the mass of activated carbon, pH and ionic strength of the solution and by increasing temperature. The adsorption capacity of the activated carbon for Allura red was relatively high. Under the optimum conditions, the maximum adsorption capacity for E129 dye was 72.85 mg/g. Three adsorption models; Langmuir, Freundlich and Temkin model were investigated regarding the adsorption of E129. The models’ parameters KL, qm, R2, (n) were determined and found to be 0.0222, 72.85 mg/g, 0.9057-0.9984, and 0.992, respectively. Also, pseudo first and second-order kinetic models were tested to determine the best-fit model to the adsorption of E129 dye onto activated carbon. The results showed that the adsorption of E129 onto activated carbon obeyed both the Freundlich isotherm and pseudo second-order kinetic models. Moreover, thermodynamic studies indicated that the adsorption of E129 dye onto the activated carbon was spontaneous.

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SYNTHESIS, CHARACTERIZATION AND ADSORPTION STUDIES OF PHOSPHORYLATED CELLULOSE FOR THE RECOVERY OF LITHIUM FROM AQUEOUS SOLUTIONS

Cellulose Chemistry and Technology ◽

10.35812/cellulosechemtechnol.2021.55.37 ◽

2021 ◽

Vol 55 (3-4) ◽

pp. 385-401

Author(s):

YASAR KEMAL RECEPOGLU ◽

ASLI YÜKSEL

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Maximum Adsorption Capacity ◽

Uptake Capacity ◽

Adsorption Models ◽

Phosphorylation Reaction ◽

Equilibrium Data ◽

Characterization Studies ◽

Fast Kinetic ◽

Mild Temperature

"In this study, pristine cellulose was functionalized by the phosphorylation reaction to make it suitable for lithium separation. After characterization studies of the synthesized adsorbent with SEM, EDX, FTIR, TGA and XPS, the effects of various parameters on the lithium uptake capacity of the adsorbent were examined. The analysis of equilibrium data by several adsorption models showed that maximum adsorption capacity of the adsorbent was found to be 9.60 mg/g at 25 °C by the Langmuir model. As initial concentration and contact time increased, adsorption capacity also increased, however, mild temperature (25-35 °C) and pH (5-6) were better for the adsorption of lithium. 80% of lithium adsorption within three minutes proved the fast kinetic nature of the adsorbent. A 99.5% desorption efficiency of lithium was achieved with 0.5 M H2SO4, among HCl and NaCl with different molarities. Phosphorylated cellulose was shown to be a favorable adsorbent for the recovery of lithium from aqueous solutions."

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Sanky (Corryocactus brevistylus) Peel as Low-Cost Adsorbent for Removal of Phosphate from Aqueous Solutions

Sustainability ◽

10.3390/su13168994 ◽

2021 ◽

Vol 13 (16) ◽

pp. 8994

Author(s):

Eliana Contreras-López ◽

Victor Miyashiro Kiyan ◽

Jaime Porras Cerrón ◽

Ana María Muñoz ◽

Fernando Ramos-Escudero ◽

...

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Adsorption Kinetics ◽

Low Cost ◽

Good Alternative ◽

Phosphate Removal ◽

Phosphate Adsorption ◽

Batch Adsorption ◽

Equilibrium Data ◽

Adsorption Rates

This study aimed to evaluate the adsorption capacity of an adsorbent obtained using sanky peel for the removal of phosphate from aqueous solutions. The study was conducted in two stages: (1) adsorbent preparation considering yield, phosphate removal, adsorption capacity, and textural characteristics; (2) an assessment of the effectiveness of using sanky peel as an adsorbent for removing phosphates from aqueous solutions. Batch adsorption was studied in aqueous solutions containing phosphate and calcium ions with the selected adsorbent. Adsorption kinetics and equilibrium isotherms were studied using mathematical models. The adsorption kinetics followed the pseudo-second-order, Elovich, and Weber–Morris models, thus demonstrating that adsorption rates were not controlled by multiple processes. Adsorption equilibrium data fitted best with the Dubinin–Radushkevich model. Finally, a Fourier transform infrared spectroscopy analysis revealed the presence of brushite spectra bands after adsorption. The results of this study can help better understand the use of sanky peel as an adsorbent and good alternative for aqueous phosphate adsorption.

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Adsorption and Deposition of Cu (II) on Modified Valonia Tannin

Materials Science Forum ◽

10.4028/www.scientific.net/msf.620-622.555 ◽

2009 ◽

Vol 620-622 ◽

pp. 555-558

Author(s):

Yi Li ◽

Xue Gang Luo ◽

Zhao Liu ◽

Yan Huang ◽

Xiao Yan Long

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Mannich Reaction ◽

Langmuir Isotherm ◽

Freundlich Isotherm ◽

Heterogeneous Surface ◽

Isotherm Model ◽

Maximum Adsorption Capacity ◽

Equilibrium Data ◽

Langmuir Isotherm Model

The modified valonian tannin was prepared through sulfonated-mannich reaction and used to adsorb Cu (II) from the aqueous solutions. The adsorption capacity rapidly reached equilibrium within 2 hours. The effect of pH on adsorption was apparent, the amount of adsorption increased significantly as the pH increased from 2.0 to 4.0 and then leveled off at pH 4.0-6.0. Equilibrium data fitted well with Freundlich isotherm model compared to Langmuir isotherm model, indicating that adsorption takes place on heterogeneous surface of the modified valonia tannin. The adsorption capacity was increased by increasing initial concentrations. The maximum adsorption capacity of cooper ion was determined to be 56.200 mg/g at 100 mg/L concentration.

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