A comparative study of the adsorption efficiency of typical adsorption materials for wastewater containing cesium

2020 ◽  
Author(s):  
Can Du ◽  
Jinsheng Wang ◽  
Xin Liu ◽  
Juanting Niu
Keyword(s):  
Activated Carbon ◽  
Adsorption Efficiency ◽  
Practical Application ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Mechanisms ◽  
Radioactive Wastewater ◽  
Alkaline Environments ◽  
Kinetics And Isotherms ◽  
Cs Ions

<p>In this paper, six typical adsorption materials (activated carbon, kaolin, montmorillonite, bentonite, zeolite, and attapulgite) were used to investigate the effects of adsorption time, initial concentration, pH, and temperature on the adsorption of cesium (Cs) contained in wastewater. A combination of kinetics and isotherms was used. The results revealed that, for the same adsorption time, the adsorption efficiencies of the six materials for Cs were as follows: zeolite>attapulgite>bentonite>montmorillonite>activated carbon>kaolin. The adsorption rate of zeolite to Cs ions was almost independent of the initial concentration and temperature. The removal effect of other materials improved in alkaline environments at 30℃. Attapulgite, montmorillonite, activated carbon, and kaolin could be used for the removal of Cs at low initial concentrations. The adsorptive processes utilized by the six adsorption materials were the result of a combination of various adsorption mechanisms. Among the six typical adsorption materials, zeolite, attapulgite, and bentonite had clear removal effects and could be used in practical application in which radioactive wastewater containing Cs needs to be disposed of. Our results suggest that zeolite is the best adsorption material for this purpose.</p>

Adsorption Behavior and Kinetics of Methyl Orange in Water on Activated Carbon

2012 ◽  
Vol 549 ◽  
pp. 318-321 ◽  
Author(s):  
Yong Hong Wu ◽  
Qi Yu ◽  
Hong Da Xu ◽  
Zhi Yong Liu ◽  
Ming Zhu Sun ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Methyl Orange ◽  
Adsorption Equilibrium ◽  
Adsorption Behavior ◽  
Adsorption Efficiency ◽  
Key Factors ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Freundlich Equation ◽  
Kinetics Of

The adsorption behavior of methyl orange aqueous solution was investigated on husk-based activated carbon. The effects of key factors, i.e., degassing pretreatment, adsorption time, temperature, adsorbent dosage and initial concentration, on the adsorption efficiency were measured. The kinetic adsorption curves and adsorption isotherms were fitted with theoretical model. The results show that the removal efficiency of methyl orange could be significantly improved by degassing pretreatment, prolonging the time, lowering temperature or reducing the initial concentration. In the context, adsorption equilibrium will be achieved up 90min. Furthermore, adsorption rate will be enhanced by the increase of the amount of activated carbon. In conclusion, adsorption isotherm and adsorption kinetics can be fitted well with Freundlich equation and pseudo-first Lagergren model, respectively.

scholarly journals Optimizing Adsorption of 17α-Ethinylestradiol from Water by Magnetic MXene Using Response Surface Methodology and Adsorption Kinetics, Isotherm, and Thermodynamics Studies

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3150
Author(s):  
Mengwei Xu ◽  
Chao Huang ◽  
Jing Lu ◽  
Zihan Wu ◽  
Xianxin Zhu ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Quadratic Model ◽  
Adsorption Efficiency ◽  
Process Variables ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Independent Variables ◽  
The Impact ◽  
Adsorbent Dose

Magnetic MXene composite Fe3O4@Ti3C2 was successfully prepared and employed as 17α-ethinylestradiol (EE2) adsorbent from water solution. The response surface methodology was employed to investigate the interactive effects of adsorption parameters (adsorption time, pH of the solution, initial concentration, and the adsorbent dose) and optimize these parameters for obtaining maximum adsorption efficiency of EE2. The significance of independent variables and their interactions were tested by the analysis of variance (ANOVA) and t-test statistics. Optimization of the process variables for maximum adsorption of EE2 by Fe3O4@Ti3C2 was performed using the quadratic model. The model predicted maximum adsorption of 97.08% under the optimum conditions of the independent variables (adsorption time 6.7 h, pH of the solution 6.4, initial EE2 concentration 0.98 mg L−1, and the adsorbent dose 88.9 mg L−1) was very close to the experimental value (95.34%). pH showed the highest level of significance with the percent contribution (63.86%) as compared to other factors. The interactive influences of pH and initial concentration on EE2 adsorption efficiency were significant (p < 0.05). The goodness of fit of the model was checked by the coefficient of determination (R2) between the experimental and predicted values of the response variable. The response surface methodology successfully reflects the impact of various factors and optimized the process variables for EE2 adsorption. The kinetic adsorption data for EE2 fitted well with a pseudo-second-order model, while the equilibrium data followed Langmuir isotherms. Thermodynamic analysis indicated that the adsorption was a spontaneous and endothermic process. Therefore, Fe3O4@Ti3C2 composite present the outstanding capacity to be employed in the remediation of EE2 contaminated wastewaters.

Removal of Geosmin by Powered Activated Carbon as an Emergency Method

2014 ◽  
Vol 587-589 ◽  
pp. 616-619
Author(s):  
Zheng Wang ◽  
Dong Zhang ◽  
Ping Xia ◽  
Hui Ye ◽  
Wen Qi Zhou
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Adsorption Efficiency ◽  
Initial Concentration ◽  
Application Point ◽  
Removal Efficiencies

The removal of geosmin by powered activated carbon (PAC) was studied at laboratory to select suitable PAC type and the removal efficiencies of geosmin by PAC in different application point as an emergency method were evaluated. The adsorption efficiency of coal-based PAC on geosmin was superior to that of bamboo-based PAC. The contact time and PAC dose were two important factors that affect the removal effect of geosmin. Geosmin could be controled below 10ng/L at 200ng/L of initial concentration.

Study on Adsorption of Cr(VI) in Wastewater by Powdered Activated Carbon

2011 ◽  
Vol 287-290 ◽  
pp. 2070-2073
Author(s):  
Jun Tan Liu ◽  
Shi Jing Liu ◽  
Huan Gao
Keyword(s):  
Activated Carbon ◽  
Powdered Activated Carbon ◽  
Activated Carbon Adsorption ◽  
Effect Of Ph ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Carbon Adsorption ◽  
Adsorption Temperature

This research focuses on absorption of Cr(VI) in wastewater by powdered activated carbon, and determines the effect of pH, initial concentration of solution, amount of powdered activated carbon, adsorption time, adsorption temperature, etc, on adsorption of Cr(VI) in wastewater. The results show that the treatment of 100mL containing Cr(VI) wastewater with concentration of 50mg/L will work best in the conditions of 0.35g powdered activated carbon, pH=3.0, 298K, and 1hour oscillatory adsorption.

Experimental Study on the Modification of Granular Activated Carbon by Potassium Permanganate to Adsorb Cu2+ in the Water

2014 ◽  
Vol 955-959 ◽  
pp. 2453-2457
Author(s):  
Hui Yang ◽  
Meng Zhao ◽  
Ji Gang Yang ◽  
Xin Chai ◽  
Yue Xu
Keyword(s):  
Activated Carbon ◽  
Potassium Permanganate ◽  
Ph Value ◽  
Removal Rate ◽  
Solution Concentration ◽  
Test Methods ◽  
Adsorption Time ◽  
Potassium Permanganate Solution ◽  
Initial Concentration ◽  
Main Factors

This document studies test methods on modification of activated carbon by potassium permanganate to adsorb Cu2+. Ensure all factors’ effects on Cu2+ removal. Use potassium permanganate solution to modify activated carbon, investigate main factors’ effects on Cu2+ removal and analyze mechanism by changing potassium permanganate solution concentration, adsorption time, activated carbon’s additive amount and temperature. The results show that modification of activated carbon by 0.03mol/L potassium permanganate solution (0.03K-GAC) can adsorb Cu2+ best. 0.03K-GAC’s removal rate on Cu2+ is 98% when the initial concentration of Cu2+ is 50mg/L, the additive amount of 0.03K-GAC is 2.0g, the pH value is 5.5, the temperature is 25°C and the adsorption time is 4h. Modification of activated carbon by potassium permanganate has good adsorbability on Cu2+. Potassium permanganate solution concentration, adsorption time and additive amount can influence the adsorption of Cu2+ by activated carbon. However, temperature’s influence on the effect of adsorption is non-significant.

scholarly journals Adsorption Capabilities of Activated Carbon Derived from Detarium microcarpum Seeds in Removing Co2+ and Pb2+ from Wastewater

2020 ◽  
pp. 167-179
Author(s):  
Ishaq Yahaya Lawan ◽  
Shinggu D. Yamta ◽  
Abdurrahman Hudu ◽  
Kolo Alhaji Madu ◽  
Adamu Mohammad ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Metal Ion ◽  
Adsorption Process ◽  
Ion Concentration ◽  
Adsorption Efficiency ◽  
Cobalt Ions ◽  
Initial Concentration ◽  
Detarium Microcarpum ◽  
Percentage Removal

This study was carried out to evaluate the efficiency of metals (Pb and Co) removal from solution using Detarium microcarpum seeds as adsorbent. The effect of initial concentration and adsorbent dosage on the adsorption process of these metals were studied, the percentage removal of these metals increased with increased in weight (0.5 -2.5g) in 50ml of the solution and the adsorption efficiency increased with increasing initial metal ion concentration (0.01-0.05 moldm−3). The percentage removal obtained for Lead and Cobalt were compared. The result of adsorption were fitted to Langmuir models and coefficients indicated favorable adsorption of Pb2+ and Co2+ ions on the adsorbents. The adsorption of Pb2+ and Co2+ in aqueous solution was in the following order (1400µm>420µm>150µm). More than 55.4% of studied Lead cations were removed by 1400µm, 47.2% by 420µm and 29.8% by 150µm. While for Cobalt cations only 53.2% by 1400µm, 38.6% by 420µm and 24% by 150µm respectively, from aqueous solution it was concluded that, activated Carbon derived from Detarium microcarpum seed is good in removing both lead and cobalt ions, which make it good absorbent.

Removal of Cr(VI) from Water Using Attapulgite/Chitosan Composites

2013 ◽  
Vol 781-784 ◽  
pp. 2233-2236
Author(s):  
Yong Chen ◽  
Shi Yu Wang ◽  
Hui Xu
Keyword(s):  
Aqueous Solution ◽  
Langmuir Isotherm ◽  
Copper Ions ◽  
External Factors ◽  
Adsorption Efficiency ◽  
Mass Ratio ◽  
Absorption Time ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Langmuir Isotherm Model

In this work attapulgite and chitosan were employed to prepare composites as eco-friendly adsorbent. Study on the adsorption efficiency of the adsorbent for Cr (VI) in aqueous solution was carried out. External factors such as the amount of attapulgite in the composites, initial concentration of Cr (VI), adsorption time and adsorbent dosage how to influence the adsorption efficiency of composites were investigated. The results showed that 0.63g adsorbent can reach maximum adsorption rate, which the mass ratio of attapulgite and chitosan is 0.8:1, the initial concentration of copper ions is 100mg / L and absorption time is 30min. Isotherm data fitted well to the Langmuir isotherm model.

scholarly journals Optimization for removal efficiency of fluoride using La(iii)–Al(iii)-activated carbon modified by chemical route

2020 ◽  
Vol 9 (1) ◽  
pp. 405-415
Author(s):  
Ting Su ◽  
Yonghui Song ◽  
Xinzhe Lan ◽  
Wenwen Gao
Keyword(s):  
Activated Carbon ◽  
Ph Value ◽  
Raw Material ◽  
Adsorption Efficiency ◽  
Key Factors ◽  
Solution Ph ◽  
Chemical Route ◽  
Structure Generation ◽  
Adsorption Time ◽  
Solution Volume

AbstractA simple chemical route was adopted for the preparation of adsorbent to remove fluoride in the simulation solution. In this study, commercially activated carbon (CAC) was used as the raw material, HNO3 (20 wt%), La(NO3)3·2H2O (0.05 mol/L), and Al(NO3)3 (0.10 mol/L) were employed as modification reagents to successfully prepare the CAC adsorbent loaded with the elements La and Al (La(iii)–Al(iii)–CAC). The modified adsorbent was characterized by scanning electron microscopy, energy-dispersive spectroscopy, and Fourier-transform infrared spectroscopy measurements. The effects of variables such as solution pH, adsorption time, initial concentrations, and volume of solution were investigated on adsorption efficiency by the response surface method (RSM). Under optimum conditions, specified as a pH value of 6, an adsorption time of 1.2 h, an initial concentration of 30 mg/L, a solution volume of 25 mL, and the value of RF can reach at 74.11%. From the RSM analysis, the pH value was a significant factor in the adsorption process and the order for these key factors was as follows: pH > adsorption time > solution volume. Meanwhile, there were interactions among these factors. Chemical modification had an important role in pore structure generation and functional group of adsorbent to improve the adsorption efficiency. The removal performance of adsorbent on simulation solution of fluoride also showed the feasibility of adsorbent to be applied in industrial purposes.

Characteristics of Cr (VI) Adsorption in Aqueous Solution by Wheat Straw

2013 ◽  
Vol 750-752 ◽  
pp. 1262-1266
Author(s):  
Li Xiu Peng ◽  
Qin Ai Lin
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Wheat Straw ◽  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Adsorption Properties ◽  
Effect Factors ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Performance

The adsorption process of Cr (VI) in aqueous solution on activated carbon prepared by wheat straw was investigated to study the effect factors on adsorption properties. adsorption mechanism was discussed. The results showed that the adsorption performance was influenced by dosage, initial concentration and adsorption time. Adsorption reached equilibrium after 100 min at temperature 25°C. The highest removal efficiency can reach 94%. The results indicated that activated carbon as adsorbent can effectively deal with waste water containing (VI).

Studies on Adsorption of Strontium (II) by Expanded Rice Husk

2012 ◽  
Vol 724 ◽  
pp. 73-76
Author(s):  
Yun Qiang Tang ◽  
Xiao Yan Lin ◽  
Ya Ping Zhang ◽  
Xue Gang Luo
Keyword(s):  
Activated Carbon ◽  
Rice Husk ◽  
Removal Rate ◽  
Low Cost ◽  
Initial Concentration ◽  
Adsorption Behaviors ◽  
Environmental Friendly ◽  
Radioactive Wastewater ◽  
Simulated Wastewater ◽  
Optimized Conditions

The expanded rice husk, a low-cost and environmental friendly absorbent, was used to remove Sr2+ from the simulated radioactive wastewater. The adsorption behaviors for the radionuclide ion Sr2+ was studied, and effects of various parameters including pH, temperature, expanded rice husk dose, initial concentration of Sr2+ and adsorbed time on the removal rate of ion Sr2+ from the simulated radioactive wastewater were evaluated. Results show that Sr2+ can be successfully removed from the simulated wastewater by the expanded rice husk, and the removal rate of ion Sr2+ on the expanded rice husk achieves as high as 99.37%, which is much higher than that on activated carbon (42.50%) at optimized conditions.

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