scholarly journals Fabrication of Highly Porous Polymeric Nanocomposite for the Removal of Radioactive U(VI) and Eu(III) Ions from Aqueous Solution

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2940
Author(s):  
Tansir Ahamad ◽  
Mu. Naushad ◽  
Mohd Ubaidullah ◽  
Saad Alshehri
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Water Solution ◽  
High Surface ◽  
Basic Medium ◽  
Batch Adsorption ◽  
Regeneration Ability ◽  
Contaminated Water ◽  
Polymeric Nanocomposite

In the present study, a polymeric nanocomposite, CoFe2O4@DHBF, was fabricated using 2,4 dihydroxybenzaldehyde and formaldehyde in basic medium with CoFe2O4 nanoparticles. The fabricated nanocomposite was characterized using FTIR, TGA, XRD, SEM, TEM, and XPS analyses. The analytical results revealed that the magnetic nanocomposite was fabricated successfully with high surface area 370.24 m2/g. The fabricated CoFe2O4@DHBF was used as an efficient adsorbent for the adsorption of U(VI) and Eu(III) ions from contaminated water. pH, initial concentration, adsorption time, and the temperature of the contaminated water solution affecting the adsorption ability of the nanocomposites were studied. The batch adsorption results exposed that the adsorption capacity for the removal of U(VI) and Eu(III) was found to be 237.5 and 225.5 mg/g. The adsorption kinetics support that both the metal ions follow second order adsorption kinetics. The adsorption isotherm well fits with the Langmuir adsorption isotherm and the correlation coefficient (R2) values were found to be 0.9920 and 0.9913 for the adsorption of U(VI) and Eu(III), respectively. It was noticed that the fabricated nanocomposites show excellent regeneration ability and about 220.1 and 211.3 mg/g adsorption capacity remains with U(VI) and Eu(III) under optimum conditions.

scholarly journals Preparation of MoS2 nano-corals by hydrothermal method for adsorption of tartrazine in the aqueous medium

2020 ◽  
Vol 9 (4) ◽  
pp. 93-99
Author(s):  
Hung Mac Van ◽  
Tuan Vu Anh
Keyword(s):  
Adsorption Capacity ◽  
Hydrothermal Method ◽  
Adsorption Kinetics ◽  
Organic Dyes ◽  
Nile Blue ◽  
High Surface ◽  
High Surface Area ◽  
Optimal Dosage ◽  
Solution Ph ◽  
Intra Particle Diffusion

Corals-like molybdenum disulfide (MoS2) have been successfully synthesized via the hydrothermal method. The as-prepared MoS2 material with a high surface area of 83.9 m2.g-1 was used for the removal of tartrazine from an aqueous solution. The effects of parameters including contact time, MoS2 dosage, and solution pH on adsorption capacity were studied. The optimal dosage of MoS2 for removing tartrazine was 0.08 g and the removal efficiency of tartrazine reached 81.5 % for 100 min of adsorption. The adsorption kinetics studies were carried out using pseudo-first-order, pseudo-second-order, and intra-particle diffusion models. The results showed that the pseudo-second-kinetic model better described the adsorption kinetics of tartrazine on MoS2 and film diffusion was the rate-limiting step. In addition, the adsorption capacity of MoS2 was also performed with various organic dyes such as nile blue, janus green B, and congo red.

scholarly journals Adsorption of nitrate onto biochar derived from agricultural residuals

2017 ◽  
Vol 77 (2) ◽  
pp. 548-554 ◽  
Author(s):  
Haihua Zhao ◽  
Yingwen Xue ◽  
Li Long ◽  
Xiaolan Hu
Keyword(s):  
Thermal Stability ◽  
Aqueous Solutions ◽  
Porous Structure ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Low Cost ◽  
Batch Adsorption ◽  
Surface Functional Groups ◽  
Good Thermal Stability ◽  
Langmuir Adsorption

Abstract To develop low-cost adsorbents for aqueous nitrate, biochars were prepared from three types of agricultural residuals at different pyrolysis temperatures (300 °C, 450 °C, and 600 °C). The corncob biochar produced at 600 °C (CC600) was the best nitrate adsorbent of all the tested biochars. Characterization results showed that CC600 had good thermal stability, porous structure, and abundant surface functional groups. Findings from batch adsorption experiments demonstrated that CC600 showed relatively fast adsorption kinetics to nitrate in aqueous solutions. In addition, the Langmuir adsorption capacity of CC600 to nitrate was 14.46 mg/g, comparable to that of other biochar-based adsorbents. Therefore, CC600 showed promising potential to be used as a low-cost adsorbent for the treatment of nitrate in water.

scholarly journals Synthesis of Iron Oxide Nanoparticle Functionalized Activated Carbon and Its Applications in Arsenic Adsorption

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Hoang Thu Ha ◽  
Pham Tuan Phong ◽  
Tran Dinh Minh
Keyword(s):  
Activated Carbon ◽  
Iron Oxide ◽  
Specific Surface ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Surface ◽  
Iron Oxide Nanoparticle ◽  
Batch Adsorption ◽  
Contaminated Water

This work reveals the As(V) adsorption behaviors onto iron oxide (Fe3O4) nanoparticles modified activated carbon (AC), originally developed from biochar (BC), as a green adsorbent denoted by FAC. Since FAC has abundant surface functional groups and a desired porous structure that is favorable for the removal of As(V) in contaminated water, FAC has greatly enhanced the As(V) adsorption capacity of the original BC. Various methods were employed to characterize the FAC characteristics and adsorption mechanism, including pHpzc determination, BET specific surface area, elemental analysis (EA), and scanning electron microscopy (SEM). Results show that the AC surface was successfully modified by iron oxide nanoparticles, enhancing the porosity and specific surface area of original adsorbent. Batch adsorption tests indicated a well-fitted Langmuir model and pseudo-second-order model for As(V) adsorption. Additionally, the highest adsorption capacity (Qmax = 32.57 mg/g) by FAC was higher than previously reported literature reviews. Until now, no article was conducted to research the effect of carbon surface chemistry and texture on As removal from waters. It is required to obtain a rational view of optimal conditions to remove As from contaminated water.

scholarly journals Adsorption of Lead(II) Ions using Coconut Fiber’s (Cocos nusifera L.) Activated by Sodium Hydroxide

2020 ◽  
Vol 9 (2) ◽  
pp. 107-110
Author(s):  
Gatut A. Wardani ◽  
Dea D. Pamungkas ◽  
Winda T. Wulandari ◽  
Fajar Setiawan ◽  
Estin Nofiyanti
Keyword(s):  
Adsorption Isotherm ◽  
Sodium Hydroxide ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Adsorption Model ◽  
Coconut Fiber ◽  
Optimum Time ◽  
K Value ◽  
Langmuir Adsorption ◽  
Langmuir Adsorption Model

The use of green coconut fiber waste to adsorb lead(II) ions has been successfully carried out. Coconut fiber was activated first using sodium hydroxide before being used as an adsorbent. The optimum time needed for green coconut fiber to adsorb lead(II) ions was 30 minutes with the percentage of ions adsorbed by 94.34%. The lead(II) adsorption kinetics on green coconut fiber model with R2 value of 0.999 and k value of 38.95 x 10-4 minutes-1. Adsorption isotherm from lead(II) on coconut fiber followed the Langmuir adsorption model with R2 value of 0.984 and adsorption capacity of 0.070 g.mg-1.

scholarly journals Enhanced adsorption capacity of ultralong hydrogen titanate nanobelts for antibiotics

2017 ◽  
Vol 5 (9) ◽  
pp. 4352-4358 ◽  
Author(s):  
Wenyao Li ◽  
Jingru Wang ◽  
Guanjie He ◽  
Li Yu ◽  
Nuruzzaman Noor ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Hollow Structure ◽  
Contaminated Water ◽  
Hydrogen Titanate ◽  
Enhanced Adsorption

Ultralong hydrogen titanate nanobelts with a hollow structure and high surface area were synthesized to serve as promising materials for effective adsorption of antibiotics from contaminated water.

Preparation and Adsorption Performance of Cu (II)-Imprinted ALG-CTS Complex Microspheres

2012 ◽  
Vol 268-270 ◽  
pp. 229-232 ◽  
Author(s):  
Wei Ying Zhang ◽  
Dan Chen ◽  
Xiao Li ◽  
Xiao Guang Ying
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Ionic Interaction ◽  
Experimental Conditions ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Performance ◽  
Series Of Experiments ◽  
Equilibrium Adsorption Isotherm

We prepared alginate-chitosan (ALG-CTS) complexes through ionic interaction, and then obtained Cu (II)-imprinted alginate-chitosan complex microspheres (Cu-ALG-CTS) by coupling with ionic imprinting technology. To investigate the effects of experimental conditions on adsorption behavior, we performed a series of experiments including changing the initial concentration of Cu (II) ions and adsorption time. We found that the adsorption capacity increases with the initial concentration of Cu (II) ions. The Cu (II) ions adsorption reaches the maximum of 70.54mg/g after adsorbing for 13h when the initial concentration of Cu (II) ions is 60μg/ml. Cu-ALG-CTS shows much higher adsorption for Cu (II) ions than Zn (II) ions. And the adsorption kinetics and equilibrium adsorption isotherm were further studied.

Study on Removal of Humic Acid by Polyurethane Foam/ Activated Carbon Composites in Boiler Feedwater

2010 ◽  
Vol 26-28 ◽  
pp. 452-456
Author(s):  
Zhi Ping Zhu ◽  
Ke Long Huang ◽  
Yi Zhou
Keyword(s):  
Activated Carbon ◽  
Humic Acid ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
High Efficiency ◽  
Removal Rate ◽  
Equilibrium Adsorption ◽  
Batch Adsorption ◽  
Equilibrium Adsorption Capacity ◽  
Boiler Feedwater

A new type and high efficiency adsorbent was prepared with powder activated carbon and polyurethane vesicant and surfactant, which being used to adsorb humic acid (HA) in boiler feedwater. The batch adsorption experiments were carrid at different pH value, different adsorbent dosage and different initial concentration to investigate HA removal rate and adsorption capacity by as-produced adsorbent. Their adsorption kinetics experiments data was fitted with pseudo-second-order rate model, its quation was 1/qt=0.094+5.51/t, and equilibrium adsorption capacity obtained from fitting curve was 10.6mg/g, consistent with the experimental results(11.5mg/g).The adsorption isotherm test was carried at 25°C-50°C, the equilibrium adsorption capacity was 10.9mg/g by Langmuir model, which being similar with experiment results, the free energy (ΔG), enthalpy(ΔH) and entropy (ΔS) were obtanined with Clapeyron-Clausius and Gibbs-Helmholtz equation in the adsorption isotherm, which all were negative, indicated that HA adsorbed by as-produced adsorbent was an exothermic process of entropy reduction.

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

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.

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 Sequential Oxidation on Wood and Its Application in Pb2+ Removal from Contaminated Water

2021 ◽  
Vol 2 (2) ◽  
pp. 245-256
Author(s):  
Priyanka R. Sharma ◽  
Sunil K. Sharma ◽  
Marc Nolan ◽  
Wenqi Li ◽  
Lakshta Kundal ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Average Length ◽  
Sodium Chlorite ◽  
Contaminated Water ◽  
Maximum Adsorption Capacity ◽  
Fiber Morphology ◽  
Carboxylate Groups ◽  
Carboxylate Content ◽  
Wide Range ◽  
Length Width

Raw wood was subjected to sequential oxidation to produce 2,3,6-tricarboxycellulose (TCC) nanofibers with a high surficial charge of 1.14 mmol/g in the form of carboxylate groups. Three oxidation steps, including nitro-oxidation, periodate, and sodium chlorite oxidation, were successfully applied to generate TCC nanofibers from raw wood. The morphology of extracted TCC nanofibers measured using TEM and AFM indicated the average length, width, and thickness were in the range of 750 ± 110, 4.5 ± 1.8, and 1.23 nm, respectively. Due to high negative surficial charges on TCC, it was studied for its absorption capabilities against Pb2+ ions. The remediation results indicated that a low concentration of TCC nanofibers (0.02 wt%) was able to remove a wide range of Pb2+ ion impurities from 5–250 ppm with an efficiency between 709–99%, whereby the maximum adsorption capacity (Qm) was 1569 mg/g with R2 0.69531 calculated from Langmuir fitting. It was observed that the high adsorption capacity of TCC nanofibers was due to the collective effect of adsorption and precipitation confirmed by the FTIR and SEM/EDS analysis. The high carboxylate content and fiber morphology of TCC has enabled it as an excellent substrate to remove Pb2+ ions impurities.

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