Adsorption of Ammonia Ions and Ammonium from Aqueous Solutions on Modified Activated Carbons

The adsorption process of ammonia ions and ammonium from aqueous solutions on the intact activated carbon obtained from nutshells through activation with phosphoric acid and oxidized with H2O2 and later impregnated with salt containing Co2+, Ag+, Ni2+, Cu2+, has been investigated. The efficiency of ammonia ions and ammonium elimination from various water categories, using both activated carbon (the intact CAN-7 and CAN-7 oxidized with H2O2 and impregnated with Co2+, Ag+, Ni2+, Cu2+ ions) has been demonstrated.

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Oxytetracycline Adsorption from Aqueous Solutions on Commercial and High-Temperature Modified Activated Carbons

Energies ◽

10.3390/en14123481 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3481

Author(s):

Joanna Lach ◽

Agnieszka Ociepa-Kubicka ◽

Maciej Mrowiec

Keyword(s):

Activated Carbon ◽

Aqueous Solutions ◽

Activated Carbons ◽

Electricity Consumption ◽

Solution Ph ◽

Carbon Modification ◽

Modification Method ◽

Flow Through ◽

Proposed Modification ◽

Modified Activated Carbons

The aim of the work was to evaluate the possibility of using commercial and modified activated carbons for the removal of oxytetracycline from aqueous solutions. The kinetics and statics of adsorption as well as the effect of the activated carbon dose and solution pH on the efficiency of the oxytetracycline adsorption were analyzed. Based on the study of oxytetracycline adsorption isotherms, the activated carbons were ranked in the following order: F-300 > WG-12 > Picabiol > ROW08 > WACC 8 × 30 > F-100 > WAZ 0.6–2.4. The most effective activated carbons were characterized by large specific surfaces. The best matching results were obtained for: Redlich–Peterson, Thot and Jovanovic models, and lower for the most frequently used Freundlich and Langmuir models. The adsorption proceeded better from solutions with pH = 6 than with pH = 3 and 10. Two ways of modifying activated carbon were also assessed. A proprietary method of activated carbon modification was proposed. It uses the heating of activated carbon as a result of current flow through its bed. Both carbons modified at 400 °C in the rotary kiln and on the proprietary SEOW (Joule-heat) modification stand enabled to obtain adsorbents with higher and comparable monolayer capacities. The advantage of the proposed modification method is low electricity consumption.

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Comparative study for adsorption of acidic and basic dyes on activated carbon prepared from date stone by different activation agent

Al-Qadisiyah Journal for Engineering Sciences ◽

10.30772/qjes.v13i1.622 ◽

2020 ◽

Vol 13 (1) ◽

pp. 12-20

Author(s):

Azhaar Radhi Jabbar

Keyword(s):

Activated Carbon ◽

Phosphoric Acid ◽

Surface Area ◽

Zinc Chloride ◽

Potassium Hydroxide ◽

Adsorption Process ◽

Activated Carbons ◽

Second Order ◽

Bet Surface Area ◽

Pseudo Second Order

This research includes a lab scale work to investigate the feasibility of treating waste water which polluted with dyes exhausted from textile factory by using adsorption process. Three type of activated carbon were prepared using locally available waste material (date stone). Chemical activation method with (zinc chloride, potassium hydroxide, or phosphoric acid) was used as activators to prepared carbon. Firstly, the materials were carbonized at 275 oC for 90 min and then the carbonized materials were treated with (4 molar) solution of acid, base or salt for 24 hour. Finally, these materials were activated at 600 oC for two hours in the presence of nitrogen gas flow. The resulted activated carbons were checked by its (BET) surface area analysis and surface morphology by SEM. The surface area values were (815, 950,600) m2/g for carbon produced from the activation of date stone by phosphoric acid, potassium hydroxide or zinc chloride respectively. SEM characterizations show that activated carbons that prepared from potassium hydroxide have higher surface area and good adsorption characteristics than that prepared from activation with phosphoric acid or zinc chloride. The adsorption process was studied using two types of dyes. The first one is acidic (methyl orange) and the other is basic (bismark brown). The adsorption isotherms and kinetics where investigated for both dyes at temperatures (30,40,50,60)oC for concentration range equal to (6-16)mg/l. The adsorption data of equilibrium were presented by using two common adsorption isotherm equations. The data was fitted fairly well with Langmuir isotherm for both dyes on all types of prepared activated carbons. The kinetic of adsorption was study by using two kinetic equations, pseudo first order and pseudo second order. The result showed the rapid increase in the rate of adsorption at the initial until equilibrium achieved. Pseudo second order model were represent the data very well with confidence level 0.99.

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Removal of ethinylestradiol by adsorption process from aqueous solutions using entrapped activated carbon in alginate biopolymer: isotherm and statistical studies

Applied Water Science ◽

10.1007/s13201-019-0951-7 ◽

2019 ◽

Vol 9 (4) ◽

Cited By ~ 2

Author(s):

Soha A. Abdel-Gawad ◽

Hossam M. Abdel-Aziz

Keyword(s):

Activated Carbon ◽

Aqueous Solutions ◽

Adsorption Process ◽

Statistical Studies

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Adsorption of Soluble Metal Ions from Red Mud by Modified Activated Carbon

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.368-372.1541 ◽

2008 ◽

Vol 368-372 ◽

pp. 1541-1544 ◽

Cited By ~ 1

Author(s):

Hua Lei Zhou ◽

Dong Yan Li ◽

Guo Zhuo Gong ◽

Ya Jun Tian ◽

Yun Fa Chen

Keyword(s):

Activated Carbon ◽

Metal Ions ◽

Adsorption Capacity ◽

Red Mud ◽

Activated Carbons ◽

Valuable Metal ◽

Surface Areas ◽

Alumina Industry ◽

Modified Activated Carbons ◽

Almost All

Activated carbon was employed as the adsorption carrier for the metal ions in HCl solution of red mud, a solid waste produced in alumina industry. To improve the adsorption capacity to valuable metal ions, the activated carbon was modified by chemicals including HNO3, H2O2, H2SO4, H3PO4, NH3, Na2CO3, and tri-butyl phosphate (TBP). It was found that the modifications contributed the high adsorption capacity to almost all metal ions we focused on. In the case of TBP, remarkably higher adsorption capacity and selectivity of Sc3+ was observed. The correlation between the surface areas, IR spectra of those chemically modified activated carbons and adsorption was schemed.

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Surface modification of phosphoric acid activated carbon by using non-thermal plasma for enhancement of Cu(II) adsorption from aqueous solutions

Separation and Purification Technology ◽

10.1016/j.seppur.2018.01.007 ◽

2018 ◽

Vol 197 ◽

pp. 156-169 ◽

Cited By ~ 30

Author(s):

Long Wu ◽

Wenjie Wan ◽

Zhongsheng Shang ◽

Xinyuan Gao ◽

Noriyuki Kobayashi ◽

...

Keyword(s):

Surface Modification ◽

Activated Carbon ◽

Phosphoric Acid ◽

Aqueous Solutions ◽

Thermal Plasma ◽

Non Thermal Plasma

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Adsorption of Free Hemoglobin from Aqueous Solutions and from Blood Plasma on Electrochemically Modified Activated Carbons

ECS Meeting Abstracts ◽

10.1149/ma2014-01/32/1247 ◽

2014 ◽

Keyword(s):

Aqueous Solutions ◽

Blood Plasma ◽

Activated Carbons ◽

Free Hemoglobin ◽

Modified Activated Carbons

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Characterization of Adsorbents Derived from Palm Fiber Waste and its Potential on Methylene Blue Adsorption

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.841.273 ◽

2020 ◽

Vol 841 ◽

pp. 273-277

Author(s):

Ariany Zulkania ◽

Muhammad Iqbal ◽

Syamsumarlin

Keyword(s):

Methylene Blue ◽

Activated Carbon ◽

Phosphoric Acid ◽

Adsorption Capacity ◽

Adsorption Process ◽

Methylene Blue Adsorption ◽

Palm Fiber ◽

Methylene Blue Removal ◽

Phosphoric Acid Concentration

In this study, two types of adsorbent including activated carbon and bio-sorbent were produced from Palm fiber wastes (PFW), which were activated by phosphoric acid. The influence of adsorbent type and phosphoric acid concentration on methylene blue adsorption was investigated. The most optimum adsorbent was determined based on adsorption capacity and removal percentage of each adsorbent. The result shows that 9.984 mg/g of adsorption capacity and 99.84% of removal percentage were achieved in 90 minutes’ adsorption, which demonstrates the huge potential of bio-sorbent and was chosen to be the most optimum adsorbent based on methylene blue removal. The characterization of bio-sorbent was then investigated using FTIR and SEM. FTIR result shows that bio-sorbent contains cellulose which affected the adsorption process while SEM result shows the cleaner pores and surface compared to bio-sorbent before activation.

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Effect of Activation Agents on COD Reduction Using Activated Carbon from Agricultural Residue

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1010.453 ◽

2020 ◽

Vol 1010 ◽

pp. 453-458

Author(s):

Mohd Zazmiezi Mohd Alias ◽

Rozidaini Mohd Ghazi ◽

Nik Raihan Nik Yusoff ◽

Mohd Hafiz Jamaludin

Keyword(s):

Activated Carbon ◽

Phosphoric Acid ◽

Potassium Hydroxide ◽

Activated Carbons ◽

Oxygen Demand ◽

Koh Activation ◽

Ftir Analysis ◽

Agricultural Residue ◽

Cod Reduction ◽

Activating Agent

This study investigated the effect of activating agent on activated carbon preparation and potential chemical oxygen demand (COD) reduction using activated carbons (AC) prepared. Zinc chloride, phosphoric acid and potassium hydroxide were utilized in impregnation of bamboo and rice husk. Result of SEM-EDX, FTIR as well as COD reduction were compared and discussed. The SEM displayed highest porosity in AC using KOH activation. FTIR analysis displayed obvious difference for each activation. AC using KOH activation obtained highest COD reduction.

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Performance of Sweet Potato’s Leaf-Derived Activated Carbon for Hydrogen Sulphide Removal from Biogas

Journal of Energy ◽

10.1155/2020/9121085 ◽

2020 ◽

Vol 2020 ◽

pp. 1-10

Author(s):

Geni Juma ◽

Revocatus Machunda ◽

Tatiana Pogrebnaya

Keyword(s):

Activated Carbon ◽

Adsorption Process ◽

Activated Carbons ◽

Chemical Activation ◽

Carbonization Temperature ◽

Optimal Test ◽

Potato Leaf ◽

Bet Analysis ◽

S 100 ◽

Activation Ratio

In this study, sweet potato leaf activated carbon (SpLAC) was prepared by the chemical activation method using KOH and applied as an adsorbent for H2S removal from biogas. The study focused on the understanding of the effect of carbonization temperature (Tc), varying KOH : C activation ratio, flow rate (FR) of biogas, and mass of SpLAC on sample adsorption capacity. The BET analysis was performed for both fresh and spent activated carbons as well as for carbonized samples, which were not activated; also, the activated carbon was characterized by XRF and CHNS techniques. The results showed that removal efficiency (RE) of the SpLAC increased with increase carbonization temperature from 600 to 800°C and the mass of sorbent from 0.4 g to 1.0 g. The optimal test conditions were determined: 1.0 g of sorbent with a KOH : C ratio of 1 : 1, Tc=800°C, and FR=0.02 m3/h which resulted in a sorption capacity of about 3.7 g S/100 g of the SpLAC. Our findings corroborated that H2S removal was contributed not only by the adsorption process with the pore available but also by the presence of iron in the sample that reacted with H2S. Therefore, upon successful H2S sorption, SpLAC is suggested as a viable adsorbent for H2S removal from biogas.

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