scholarly journals Adsorption of Metolachlor and Its Transformation Products, ESA and OXA, on Activated Carbons

2021 ◽  
Vol 11 (16) ◽  
pp. 7342
Author(s):  
Alicia Gomis-Berenguer ◽  
Pauline Sidoli ◽  
Benoît Cagnon
Keyword(s):  
Chemical Composition ◽  
Potassium Carbonate ◽  
Adsorption Process ◽  
Carbon Materials ◽  
Activated Carbons ◽  
Transformation Products ◽  
Lignocellulosic Residues ◽  
Adsorption Capacities ◽  
Commercial Carbon ◽  
Herbicide Metolachlor

Three activated carbons from lignocellulosic residues and a commercial carbon have been tested for the removal of the herbicide metolachlor and its two degradation transformation products, named ESA and OXA, in aqueous solutions. The kinetics and equilibrium adsorption were studied for the four materials, showing higher adsorption capacities for the three molecules on the carbon materials chemically activated by potassium carbonate, mainly associated with its greater porous development, especially in the range of microporosity. Additionally, the chemical composition of the adsorbents also highlighted their important influence on the ESA and OXA adsorption process. The efficient adsorption of both compounds—even at low initial concentrations—allows a removal efficiency of up to 80% to be reached, revealing promising perspectives for the use of biomass-derived carbon materials for the elimination of not only the herbicide metolachlor, but also its degradation compounds from contaminated wastewater.

scholarly journals The Efficiency of the Removal of Naphthalene from Aqueous Solutions by Different Adsorbents

2020 ◽  
Vol 17 (16) ◽  
pp. 5969
Author(s):  
Alicja Puszkarewicz ◽  
Jadwiga Kaleta
Keyword(s):  
Adsorption Process ◽  
Activated Carbons ◽  
Water Solution ◽  
Breakthrough Curves ◽  
Maximum Adsorption Capacity ◽  
Flow Conditions ◽  
Filtration Method ◽  
Adsorption Capacities ◽  
Effects Of Ph ◽  
Static Conditions

The paper presents the results of laboratory tests on possibilities to utilize active carbons produced in Poland (AG-5 and DTO) and clinoptilolite for removing naphthalene from a water solution in the adsorption process. The concentration of naphthalene in the model solution was 20 mg/dm3. The effects of pH, dose and adsorption time were determined under static conditions. Adsorption kinetics were consistent with the pseudo-second-order model (PSO). Among the applied models, the best fit was obtained using the Langmuir isotherms. The maximum adsorption capacity for the activated carbons (AG-5 and DTO) equaled 24.57 and 30.28 mg/g, respectively. For clinoptilolite, all the analyzed models of adsorption poorly described the adsorption process. The flow conditions were realized by filtration method. On the basis of the obtained results, the breakthrough curves, so-called isoplanes, were prepared and served in turn to determine the adsorption capacities in flow conditions. The total adsorption capacities determined under dynamic conditions of the AG-5 and DTO activated carbons were 85.63 and 94.54 mg/g, respectively, and only 2.72 mg/g for clinoptilolite. The exit curves (isoplanes) were also utilized to determine the mass penetration zone (the adsorption front height), as well as to calculate the rate of mass-exchange zone advance.

scholarly journals Application of Sludge-Based Activated Carbons for the Effective Adsorption of Neonicotinoid Pesticides

2021 ◽  
Vol 11 (7) ◽  
pp. 3087
Author(s):  
Eva Sanz-Santos ◽  
Silvia Álvarez-Torrellas ◽  
Lucía Ceballos ◽  
Marcos Larriba ◽  
V. Ismael Águeda ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Wastewater Treatment Plants ◽  
Activated Carbons ◽  
Low Cost ◽  
High Adsorption ◽  
Secondary Pollution ◽  
Adsorption Capacities ◽  
Agricultural Use ◽  
Neonicotinoid Pesticides ◽  
Watch List

The amount of sludge produced in wastewater treatment plants (WWTPs) has increased over the years, and the methods used to reduce this waste, such as incineration, agricultural use, or disposal in landfills, cause problems of secondary pollution. For this reason, it is necessary to find sustainable and low-cost solutions to manage this waste. Additionally, emerging and priority pollutants are attracting attention from the scientific community as they can generate health problems due to inadequate removal in conventional WWTPs. In this work, a pharmaceutical industry sludge was used as a precursor in the synthesis of four activated carbons (ACs) using different activating agents (ZnCl2, FeCl3∙6H2O, Fe(NO3)3∙9H2O, and Fe(SO4)3∙H2O), to be used for the removal by adsorption of three neonicotinoid pesticides included in latest EU Watch List (Decision 2018/840): acetamiprid (ACT), thiamethoxam (THM), and imidacloprid (IMD). The prepared ACs showed micro–mesoporous properties, obtaining relatively slow adsorption kinetics to reach equilibrium, but despite this, high values of adsorption capacity (qe) were obtained. For example, for AC-ZnCl2 (SBET = 558 m2/g), high adsorption capacities of qe = 128.9, 126.8, and 166.1 mg/g for ACT, THM, and IMD, respectively, were found. In most cases, the adsorption isotherms showed a multilayer profile, indicating an important contribution of the mesoporosity of the activated carbons in the adsorption process.

Preparation and Characterization of Activated Carbons Based on Lignocellulosic Residues

2013 ◽  
Vol 856 ◽  
pp. 69-73 ◽  
Author(s):  
Cibele C.O. Alves ◽  
Pablo D. Rocha ◽  
Adriana S. Franca ◽  
Leandro S. Oliveira
Keyword(s):  
Activated Carbons ◽  
Press Cake ◽  
Lignocellulosic Residues ◽  
Adsorption Mechanisms ◽  
Corn Cobs ◽  
Adsorption Capacities ◽  
Precursor Material ◽  
Coffee Grounds ◽  
Physical And Chemical

This paper presents a comparative evaluation of three lignocellulosic residues (corn cobs, spent coffee grounds and Raphanus sativus press cake) as precursor materials in the production of activated carbons (ACs). Results indicate that the precursor material has a significant effect in both physical and chemical aspects of the adsorbent as well as on the adsorption mechanisms. Highest and lowest values of iodine number and density were observed for ACs based on press cake and corn cobs, respectively. Regardless of the observed differences in surface chemical make-up and adsorption mechanisms, all employed materials were deemed adequate for adsorbent production, since the prepared ACs presented adsorption capacities similar or even higher than those of commercial ACs and other residue-based adsorbents.

scholarly journals Valorisation des coques de noyaux de Balanites aegyptiaca (L.) Del. et Hyphaene thébaica (L.) Mart. pour l’élaboration et caractérisation de Charbons Actifs; application pour l’élimination du chrome

2018 ◽  
Vol 14 (21) ◽  
pp. 195
Author(s):  
Sanda Mamane Ousmaila ◽  
Siragi Dounounou Boukari Maâzou ◽  
Malam Alma Maman Mousbahou ◽  
Natatou Ibrahim
Keyword(s):  
Specific Surface ◽  
Adsorption Process ◽  
Activated Carbons ◽  
Correlation Coefficients ◽  
Balanites Aegyptiaca ◽  
Adsorption Capacities ◽  
Calculated Parameter ◽  
Parameter Values

This paper focuses on the development and characterization of activated carbons to agro-food waste by activation with ortho phosphoric acid, and its application in the elimination of chromium in solution. The functions were determined by Bohem's method. The thermal analysis was carried out on the hulls of waste. The specific surface area and the pore volume are determined according to the method of Brunauer, Emmet and Teller and the method of Barret, Joyner and Halenda respectively. The Lagergren and Ho and McKay models were used for the kinetic study of chromium removal. Those of Langmuir and Freundlich have to do with the study of isotherms and the law of Van't Hoff and Gibbs in relation to the determination of thermodynamic parameters. The results obtained show that the surface functions are acidic in nature. Activated carbon from balanites aegyptiaca has developed a specific surface (1560.7401 m2 g -1 ) that exceeds that of Hyphaene thebaica (722.1510 m2 g -1 ). The pseudo-order 2 kinetics (Ho and McKay) better describe the adsorption with correlation coefficients close to unity. Adsorption capacities and rate constants prove rapid adsorption at the early stages. For the isotherms, the calculated parameter values are much more consistent with those of the Langmuir isotherm. ∆Gads 0 < 0 ; the adsorption process is spontaneous. Moreover, the values are in the range of a physisorption.

Biogas pre-upgrading by adsorption of trace compounds onto granular activated carbons and an activated carbon fiber-cloth

2009 ◽  
Vol 59 (5) ◽  
pp. 935-944 ◽  
Author(s):  
B. Boulinguiez ◽  
P. Le Cloirec
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Carbon Materials ◽  
Activated Carbons ◽  
Granular Activated Carbon ◽  
Activated Carbon Fiber ◽  
Wastewater Sludge ◽  
Adsorption Capacities ◽  
Carbon Fiber Cloth ◽  
Activated Carbon Fiber Cloth

The study assesses the adsorption onto activated carbon materials of selected volatile organic compounds -VOCs- (dichloromethane, 2-propanol, toluene, siloxane D4) in a biogas matrix composed of methane and carbon dioxide (55:45 v/v). Three different adsorbents are tested, two of them are granular activated carbon (GAC), and the last is an activated carbon fiber-cloth (ACFC). The adsorption isotherm data are fitted by different models by nonlinear regression. The Langmuir-Freundlich model appears to be the adequate one to describe the adsorption phenomena independently of the VOC considered or the adsorbent. The adsorbents present attractive adsorption capacity of the undesirable compounds in biogas atmosphere though the maximum adsorption capacities for a VOC are quite different from each other. The adsorption kinetics are characterized through three coefficients: the initial adsorption coefficient, the external film mass transfer coefficient and the internal diffusion coefficient of Weber. The ACFC demonstrates advanced kinetic yields compared to the granular activated carbon materials whatever VOC is considered. Therefore, pre-upgrading of biogas produced from wastewater sludge or co-digestion system by adsorption onto activated carbon appears worth investigating. Especially with ACFC material that presents correct adsorption capacities toward VOCs and concrete regeneration process opportunity to realize such process.

Elemental Quantification and Residues Characterization of Wet Digested Certified and Commercial Carbon Materials

2016 ◽  
Vol 88 (23) ◽  
pp. 11783-11790 ◽  
Author(s):  
Filipa R. F. Simoes ◽  
Nitin M. Batra ◽  
Bashir H. Warsama ◽  
Christian G. Canlas ◽  
Shashikant Patole ◽  
...  
Keyword(s):  
Carbon Materials ◽  
Commercial Carbon

Increase the Microporosity and CO2 Adsorption of a Commercial Activated Carbon

2015 ◽  
Vol 749 ◽  
pp. 17-21 ◽  
Author(s):  
Joanna Sreńscek Nazzal ◽  
Karolina Glonek ◽  
Jacek Młodzik ◽  
Urszula Narkiewicz ◽  
Antoni W. Morawski ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Materials ◽  
Micropore Volume ◽  
Microporous Carbon ◽  
Microporous Carbons ◽  
Adsorption Capacities

Microporous carbons prepared from commercial activated carbon WG12 by KOH and/or ZnCl2 treatment were examined as adsorbents for CO2 capture. The micropore volume and specific surface area of the resulting carbons varied from 0.52 cm3/g (1374 m2/g) to 0.70 cm3/g (1800 m2/g), respectively. The obtained microporous carbon materials showed high CO2 adsorption capacities at 40 bar pressure reaching 16.4 mmol/g.

Manufacturing of Carbonaceous Materials Based on Olive Stones Biomass for Electrochemical Applications

2010 ◽  
Vol 446 ◽  
pp. 23-31
Author(s):  
Anastasia Pikasi ◽  
Pantelitsa Georgiou ◽  
Johannis Simitzis
Keyword(s):  
Cyclic Voltammetry ◽  
Carbon Materials ◽  
Proper Solution ◽  
Carbon Fibres ◽  
Carbonaceous Materials ◽  
Sem Images ◽  
Olive Stones ◽  
Commercial Carbon ◽  
Materials Used ◽  
Crystallographic Planes

Carbonaceous materials have been obtained by pyrolysis of composites based on olive stones biomass, novolac resin as binding agent, with or without an aromatic compound (naphthalene). The pyrolysis residue at 1000 °C is 40 w% and its electrical conductivity, σ, is 0.13 S/cm. Small cylindrical specimens have been manufactured and pyrolyzed at 1000 °C in order to be used as electrodes. Platinum was electrodeposited by cyclic voltammetry on these specimens using them as working electrodes or on commercial carbon fibres, respectively, for correlating purposes. The morphology of both carbon materials, used as electrodes, was characterized by SEM images and the presence of Pt was determined based on EDS analysis. The crystallographic planes of Pt–carbon of Pt deposited on carbon materials were characterized with XRD. The oxidation of ethanol from a proper solution using the carbonaceous specimen and the carbon fibres as working electrodes was examined by cyclic voltammetry.

Experimental Study on Adsorption of Gasoline Vapor on Activated Carbon at High Concentration

2013 ◽  
Vol 807-809 ◽  
pp. 549-552 ◽  
Author(s):  
Chen Lu Zhao ◽  
Wei Qiu Huang ◽  
Ying Xia Wang ◽  
Li Shi
Keyword(s):  
Temperature Rise ◽  
Activated Carbons ◽  
Thermodynamic Characteristics ◽  
High Concentration ◽  
Vapor Adsorption ◽  
Gasoline Vapor ◽  
Adsorption Capacities ◽  
Bed Temperature ◽  
Relationship Of ◽  
The Relationship

Dynamic and thermodynamic characteristics of gasoline vapor adsorption at 0.3 mol/mol on different activated carbons (ACs) were investigated. The adsorption capacities of AC1 and AC3 were 0.295 g/g and 0.189 g/g at 20 oC, and 0.284 g/g and 0.165 g/g at 30 °C, respectively. Bed temperature rise was up to 50°C to 60°C in the adsorption of gasoline vapor at 0.3 mol/mol.The heat effect formula for high concentration vapor adsorption was deduced to evaluate the relationship of the adsorption capacity of the activated carbons, the mole fraction of the inlet gasoline vapor, the recovery efficiency of the gasoline vapor with the temperature rise.

A Study on Adsorption Ammonia Nitrogen of Diatomite Modified by Microwave

2012 ◽  
Vol 602-604 ◽  
pp. 1211-1214
Author(s):  
Zhi Wen Luo ◽  
Zhong Chen ◽  
Su Hong Liu
Keyword(s):  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Nitrogen Adsorption ◽  
Microwave Treatment ◽  
Ammonia Nitrogen ◽  
Ammonia Adsorption ◽  
Freundlich Isotherms ◽  
Adsorption Capacities ◽  
The Impact ◽  
Modified Diatomite

Diatomite was modified by microwave treatment to increase their utilization value, using modified diatomite to treat ammonia-nitrogen wastewater. The experiment indicated that adsorption process of modification of the modified time by microwaves and microwave power is the impact of ammonia adsorption of the main factors. Through modification experiments by raising the capacity of diatomite adsorption ammonia nitrogen, adsorption of ammonia nitrogen increase over one time. Langmuir and Freundlich isotherms were used to fit and the experimental results show that the modified diatomite adsorption onto ammonia nitrogen accords with Langmuir and Freundlich isotherm. The maximum theoretical adsorption capacities are 5.81083mg/g.

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