Study on the Absorption Action of Modified Activated Carbon for Phenol

2010 ◽  
Vol 113-116 ◽  
pp. 1981-1985
Author(s):  
Chun Sheng Ding ◽  
Fang Ming Ni ◽  
Hui Ye Cai ◽  
Qian Fen Zhu ◽  
Ying Long Zou
Keyword(s):  
Activated Carbon ◽  
Removal Rate ◽  
Copper Nitrate ◽  
Langmuir Model ◽  
Absorption Properties ◽  
Modified Activated Carbon ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Initial Adsorption ◽  
Initial Adsorption Rate

To improve the adsorption efficiency of activated carbon for phenol, copper nitrate was used to modify activated carbon. In detail, the absorption properties of modified activated carbon was studied by investigating the effects of adsorption time, pH, amount of modified activated carbon and initial concentration of phenol on the adsorption. And the dynamic and adsorbent model were obtained and explored. It shows that the removal rate of modified activated carbon for phenol was higher than the unmodified carbon, and the best removal rate can be obtained under the conditions of pH about 5, adsorption time of 2h, modified activated carbon dosage of 1.0g. The quasi-two rate equation was better to reflect the dynamics of modified activated carbon for phenol, with the initial concentration of phenol increased, equilibrium adsorption capacity and initial adsorption rate were greater. Both Freundlich and Langmuir model could reflect the adsorption behavior of modified activated carbon for phenol, while the Langmuir model was more properly.

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.

Nanoparticle Fe3O4 magnetized activated carbon from Armeniaca sibirica shell for the adsorption of Hg(II) ions

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 6100-6120
Author(s):  
Yinan Hao ◽  
Yanfei Pan ◽  
Qingwei Du ◽  
Xudong Li ◽  
Ximing Wang
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Entropy Change ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
Initial Concentration

Armeniaca sibirica shell activated carbon (ASSAC) magnetized by nanoparticle Fe3O4 prepared from Armeniaca sibirica shell was investigated to determine its adsorption for Hg2+ from wastewater. Fe3O4/ASSAC was characterized using XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), SEM (scanning electron microscopy), and BET (Brunauer–Emmett–Teller). Optimum adsorption parameters were determined based on the initial concentration of Hg2+, reaction time, reaction temperature, and pH value in adsorption studies. The experiment results demonstrated that the specific surface area of ASSAC decreased after magnetization; however the adsorption capacity and removal rate of Hg2+ increased 0.656 mg/g and 0.630%, respectively. When the initial concentration of Hg2+ solution was 250 mg/L and the pH value was 2, the adsorption time was 180 min and the temperature was 30 °C, and with the Fe3O4/ASSAC at 0.05 g, the adsorption reaching 97.1 mg/g, and the removal efficiency was 99.6%. The adsorption capacity of Fe3O4/ASSAC to Hg2+ was in accord with Freundlich isotherm models, and a pseudo-second-order kinetic equation was used to fit the adsorption best. The Gibbs free energy ΔGo < 0，enthalpy change ΔHo < 0, and entropy change ΔSo < 0 which manifested the adsorption was a spontaneous and exothermic process.

Study on the Alage Removal by Microwave Irradiation

2010 ◽  
Vol 113-116 ◽  
pp. 87-90
Author(s):  
Qing Jie Xie
Keyword(s):  
Activated Carbon ◽  
Microwave Irradiation ◽  
Removal Efficiency ◽  
Oxidation Process ◽  
Removal Rate ◽  
Treatment Efficiency ◽  
Dynamic Reaction ◽  
Initial Concentration ◽  
First Order ◽  
Pollutants Removal

The microwave irradiation (MI) was found that it had significantly treatment efficiency for pollutants removal. It was developed to treat the alage in this paper. The granular activated carbon (GAC) was used as catalyst. The effect of the acting time, MI power, GAC amount and the initial concentration on alage removal were studied. The results showed: with the increasing of the acting time, MI power, GAC amount the alage removal rate were increased, but the effect of the initial concentration to alage removal was opposite; the optimum value of acting time, MI power and GAC amount were 5min, 450W and 3g respectively with the alage removal efficiency reached up to 100%. It also showed that with the alage removed under the MI the COD, SS were removed too. It was discovered that the oxidation process was basically in conformity with the first-order dynamic reaction(ln(C/C0)＝-0.9371t+0.6744（R2=0.9472）).

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.

Microwave-Ferrous Sulfate Modified Activated Carbon Adsorption Study on Phosphorus Removal

2014 ◽  
Vol 919-921 ◽  
pp. 2149-2152
Author(s):  
Ya Feng Li ◽  
Chun Fei Wei
Keyword(s):  
Activated Carbon ◽  
Reaction Time ◽  
Phosphorus Removal ◽  
Ferrous Sulfate ◽  
Removal Rate ◽  
High Concentration ◽  
Activated Carbon Adsorption ◽  
Modified Activated Carbon ◽  
Carbon Adsorption ◽  
Treated Effluent

Using microwave-ferrous sulfate modified activated carbon adsorption manner to remove the high concentration of phosphorus in wastewater. The power of microwavethe concentration of ferrous sulfate and reaction time on phosphorus removal were studied. When the power of microwave was 425W,the concentration of ferrous sulfate was 0.1mol/L,reaction time was 50 min,the removal rate of TP reaches 95.67%,the treated effluent TP can be dropped to 0.48mg/L,the TP can reaches the first effluent standard of TP in the comprehensive wastewater discharge standard (GB8978-1996).Microwave-ferrous sulfate modified activated carbon is adapted to treat high concentration phosphorus in the wastewater.

Study on Treatment of Cr (VI)-Containing Wastewater with Nitric Acid Modified Activated Carbon

2011 ◽  
Vol 413 ◽  
pp. 38-41
Author(s):  
Xiu Ling Song ◽  
Hui Qian
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Nitric Acid ◽  
Ph Value ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Exchange Capacity ◽  
Modified Activated Carbon ◽  
Exchange Adsorption ◽  
Adsorption Curve

After activated carbon is oxidized and modified with nitric acid (1:1), its cation exchange capacity can amount to 1.840 mmol • g-1. The modified activated carbon is used as adsorbent for the treatment of Cr (Ⅵ)-containing wastewater at room temperature, and its removal mechanism is discussed in this paper. It is shown that: when the pH value of the aqueous solution being 2.5-3.0;the adsorption time being 3.0h, the removal rate of Cr (Ⅵ) in the aqueous solution can reach 97% and its adsorption capacity can amount to 45.66 mg • g-1. From the results, it can be also seen that the adsorption curve to chromium in wastewater by the modified activated carbon better meets the Freundlich isotherm, and ion exchange adsorption mainly does its work.

scholarly journals Design and operation of submerged layer in bioretention for enhanced nitrate removal

2019 ◽  
Vol 68 (8) ◽  
pp. 744-756 ◽  
Author(s):  
Junyu Zhang ◽  
Rajendra Prasad Singh ◽  
Yunzhe Liu ◽  
Dafang Fu
Keyword(s):  
Activated Carbon ◽  
Removal Rate ◽  
Nitrate Removal ◽  
Yangtze River Delta ◽  
Lake Basin ◽  
Modified Activated Carbon ◽  
N Removal ◽  
Tai Lake ◽  
N 93 ◽  
Tai Lake Basin

Abstract Bioretention, initially designed for treating discontinuous runoff pollution, faces considerable challenges in its trade-off between the hydraulic retention time (HRT) and its treatment capacity. In this study, six enhanced submerged media together with four HRTs were designed for bioretention cells to treat the highly nitrogenous river water in Tai lake basin in Yangtze River delta, China. Results revealed that bioretention with activated carbon has the highest removal of nitrate (NO3−-N) (93–96%) compared with surfactant-modified activated carbon (SMAC), surfactant-modified zeolite (SMZ), zeolite, fly ash and ceramsite. Although the SMAC had the best absorption for NO3−-N and could desorb NO3−-N when its concentration was low in the submerged layer, the desorbed surfactant could inhibit the growth of denitrifying bacteria, which leads to low removal efficiency (49–66%). The dynamic balancing of NO3−-N desorption and denitrifying system restrain in the SMAC device was observed and explained. The best activated carbon-gravel proportion in the submerged layer was 1:1 (150 mm). Such design could ensure the stable and efficient NO3−-N removal rate (93–94%) under high inflow concentration (28.9 mg/L) and high hydraulic loading (8.2 cm/h).

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.

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

&lt;p&gt;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&gt;attapulgite&gt;bentonite&gt;montmorillonite&gt;activated carbon&gt;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&amp;#8451;. 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.&lt;/p&gt;

scholarly journals Kinetics of Phenol Removal from Aqueous Solution by Adsorption onto Peanut Shell Acid-Activated Carbon

2005 ◽  
Vol 23 (4) ◽  
pp. 289-302 ◽  
Author(s):  
Elio E. Gonzo ◽  
Luis F. Gonzo
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Rate Constant ◽  
Equilibrium Adsorption ◽  
Phenol Removal ◽  
Peanut Shell ◽  
Pseudo Second Order ◽  
Equilibrium Adsorption Capacity ◽  
Initial Adsorption ◽  
Initial Adsorption Rate

A pseudo-second-order rate equation describing the kinetic adsorption of phenol onto peanut shell acid-activated carbon at different initial concentrations, carbon dosages and particle sizes has been developed. The adsorption kinetics were followed on the basis of the amount of phenol adsorbed at various time intervals at 22°C. The rate constant and the equilibrium adsorption capacity were calculated. From these parameters, empirical correlations for predicting the equilibrium adsorption capacity as a function of the C0/D ratio, and for estimating the rate constant as a function of the relation D/(C0dp)0.5, were derived. This allowed a general rate expression for design purposes to be obtained which was valid for C0/D ≤ 1.5. The operation line for each case studied was constructed and the equilibrium adsorption capacity obtained. A comparison was undertaken with the experimental adsorption isotherm as previously determined. The effect of the initial phenol concentration, the carbon dose and the particle size on the initial adsorption rate was also analyzed.

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