scholarly journals Adsorption of Dodecatungstosilicic Acid on to Activated Carbons from Aqueous and Acidic Media

1997 ◽  
Vol 15 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Wen-Ling Chu ◽  
Xiang-Guang Yang ◽  
Xing-Kai Ye ◽  
Yue Wu
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherms ◽  
Activated Carbons ◽  
Chemical Properties ◽  
Pronounced Effect ◽  
Heteropoly Acids ◽  
Surface Chemical ◽  
Adsorption Model ◽  
Acidic Media ◽  
Mineral Acids

Heteropoly acids (HPAs), such as dodecatungstosilicic acid (SiW12), adsorb strongly on to activated carbons. The surface chemical properties of the activated carbons have a pronounced effect on the adsorption of HPAs. To obtain activated carbons with the desired surface chemical properties, modification with mineral acids has been applied. The adsorption isotherms of SiW12 from aqueous solution and various acidic media on to the various carbons have been studied. On the basis of the results obtained, an adsorption model for HPAs from acidic media is presented.

Surface modification and electrochemical properties of activated carbons for supercapacitor electrodes

2015 ◽  
Vol 29 (Supplement 1) ◽  
pp. 1550254 ◽  
Author(s):  
Dan Yang ◽  
Wenmei Qiu ◽  
Jingcai Xu ◽  
Yanbing Han ◽  
Hongxiao Jin ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Activated Carbons ◽  
Chemical Properties ◽  
Bet Surface Area ◽  
Surface Chemical ◽  
X Ray Diffraction ◽  
Galvanostatic Charge ◽  
X Ray ◽  
Charge Discharge

Modifications with different acids (HNO3, H2SO4, HCl and HF, respectively) were introduced to treat the activated carbons (ACs) surface. The microstructures and surface chemical properties were discussed by X-ray diffraction (XRD), thermogravimetric analysis (TGA), ASAP, Raman spectra and Fourier transform infrared (FTIR) spectra. The ACs electrode-based supercapacitors were assembled with 6 mol ⋅ L[Formula: see text] KOH electrolyte. The electrochemical properties were studied by galvanostatic charge–discharge and cyclic voltammetry. The results indicated that although the BET surface area of modified ACs decreased, the functional groups were introduced and the ash contents were reduced on the surface of ACs, receiving larger specific capacitance to initial AC. The specific capacitance of ACs modified with HCl, H2SO4, HF and HNO3 increased by 31.4%, 23%, 21% and 11.6%, respectively.

scholarly journals Adsorption of 1,2-dichloropropane from aqueous solution

2007 ◽  
Vol 9 (2) ◽  
pp. 34-36
Author(s):  
Robert Pełech ◽  
Eugeniusz Milchert
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherms ◽  
Adsorption Equilibrium ◽  
Activated Carbons ◽  
High Surface ◽  
Surface Polarity ◽  
Polymeric Adsorbents ◽  
Freundlich Equation ◽  
Adsorptive Properties

Adsorption of 1,2-dichloropropane from aqueous solution In this study dependences of the adsorption equilibrium of 1,2-dichloropropane in aqueous solution for six activated carbons (A, AG, AG5, DTO, WD-ekstra, CWZ-22) and four polymeric adsorbents (XE-563, XE-572, XE-340, XE-348) were presented. All the adsorption isotherms onto activated carbons were described by the Freundlich equation. To analyze the isotherms on the polymeric adsorbents the Langmuir-Freundlich equation was used. It was found that in the low range of the concentrations the adsorptive properties of the activated carbons are reduced in the following direction DTO>WD-ekstra>CWZ-22>AG>A>AG5. Reducing the adsorptive properties of the polymeric adsorbents states was carried out in the following order: XE-340> XE-572>XE-563>XE-348. The adsorbents XE-340, XE-572 and XE-563 have much more higher adsorptive properties than the applied activated carbons. Lower adsorptive properties of XE-348 are the result of its high surface polarity.

Analysis of the adsorption isotherms of a non-ionic surfactant from aqueous solution onto activated carbons

Carbon ◽  
2001 ◽  
Vol 39 (6) ◽  
pp. 849-855 ◽  
Author(s):  
C.M. González-Garcı́a ◽  
M.L. González-Martı́n ◽  
V. Gómez-Serrano ◽  
J.M. Bruque ◽  
L. Labajos-Broncano
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherms ◽  
Activated Carbons ◽  
Ionic Surfactant

scholarly journals Byproducts from the edible oil industry as potential adsorbent for the removal of Pregabalin from aqueous solution

2021 ◽  
Vol 12 (2) ◽  
pp. 1513-1520
Author(s):  
Chandrarao D ◽  
Rama Devi D ◽  
Vani P ◽  
Basavaiah K ◽  
Satyabalaji T ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbons ◽  
Industrial Effluent ◽  
Cost Effective ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Pseudo Second Order ◽  
Initial Drug

Removal of Pregabalin from aqueous solution as well as industrial effluent using a new, efficient and cost-effective activated carbon derived from groundnut seed cake powder (GNSCP) and coconut cake powder (CCP) has been presented in this study. Experimentation has been carried out by optimizing various parameters such as pH, contact time, dosage, temperature and initial drug concentration using a batch adsorption model. Surface texture and morphology of the activated carbons have been analyzed by HR SEM; Characterization of the adsorbents has been carried out using FTIR and PXRD. Bio-sorption of Pregabalin using GNSCP and CCP followed pseudo-second-order kinetics. Langmuir adsorption isotherm suits the best for the present study. Thermodynamic studies showed that the adsorption of the drug onto the chosen adsorbents is a spontaneous and feasible process. The maximum adsorption capacity for the uptake of Pregabalin by GNSCP was found to be 9.71 mg/g and with CCP 9.83 mg/g. Suitability of the adsorbents for the treatment of industrial effluent has also been carried out and found to have 98 % removal of the drug from the effluent.

scholarly journals Adsorption of CCl4 from Aqueous Solution on Activated Carbons

2000 ◽  
Vol 18 (9) ◽  
pp. 823-837 ◽  
Author(s):  
Eugeniusz Milchert ◽  
Waldemar Goc ◽  
Robert Pelech
Keyword(s):  
Aqueous Solution ◽  
Activated Carbons

scholarly journals Computer Analysis of the Porous Structure of Activated Carbons Derived from Various Biomass Materials by Chemical Activation

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4121
Author(s):  
Mirosław Kwiatkowski ◽  
Elżbieta Broniek
Keyword(s):  
Porous Structure ◽  
Adsorption Isotherms ◽  
Computer Analysis ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Adsorbed Layer ◽  
Dry Mass ◽  
Mass Ratio ◽  
Adsorption Volume ◽  
Homogeneous Surface

In this study, the preparation of activated carbons from various materials of biomass origin by activation with potassium hydroxide and a comprehensive computer analysis of their porous structure and adsorption properties based on benzene (C6H6) adsorption isotherms were carried out. In particular, the influence of the mass ratio of the activator’s dry mass to the char mass on the formation of the microporous structure of the obtained activated carbons was analysed. The summary of the analyses carried out based on benzene adsorption isotherms begged the conclusion that activated carbon with a maximum adsorption volume in the first adsorbed layer and homogeneous surface can be obtained from ebony wood at a mass ratio of the activator to the char of R = 3. The obtained results confirmed the superiority of the new numerical-clustering-based adsorption analysis (LBET) method over simple methods of porous structure analysis, such as the Brunauer–Emmett–Teller (BET) and Dubinin–Raduskevich (DR) methods. The LBET method is particularly useful in the evaluation of the influence of the methods and conditions of production of activated carbons on the formation of their porous structure. This method, together with an appropriate economic analysis, can help in the precise selection of methods and conditions for the process of obtaining activated carbons at specific manufacturing costs, and thus makes it possible to obtain materials that can successfully compete with those of other technologies used in industrial practice and everyday life.

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