ADSORPTION OF 4-CHLORPHENOL BY BROWN COAL ACTIVATED BY POTASSIUM HYDROXIDE
نویسندگان
چکیده
The purpose of work is to evaluate the 4-chlorophenol (CP) adsorption capacity brown coal activated carbons (ACs) prepared at different temperature KOH activation. ACs were obtained in three stages: 1) impregnation with a solution, 2) heating (4 deg/min) argon given t (400-800°C) and exposure for 1 h, 3) cooling, washing from KOH, drying. samples are designated as AC(t). Based on N2 adsorption-desorption isotherms, total pore volume (Vt, cm3/g) specific surface area (S, m2/g) determined. measured 25°?, CP concentration ?700 mg/L, ?C dosage – g/L.
 alkaline activation was found be key factor forming porosity ability adsorb CP. maximum (ACP(m), mg/g) increases 6.6 times up 307 mg/g AC(800) having S=1142 m2/g. (ACP(S) = ACP(m)/S, mg/m2) sharply decreases sample range AC(400) AC(550) weakly depends 550-800°C. kinetics best described by pseudo-second order model. rate determining stage interaction molecules AC surface. isotherms Langmuir model.
 dependence ACP(m) S can approximated linear equations that probably correspond regions adsorbtion centers (AdCs). first (S?370 characterized small increment (kS=0.103 mg/m2), but significant (16.4 times) decrease ACP(S). In second region (S=370-770 m2/g, t=550-750°C), 10 more (kS=0.985 third (S?770 t?750°C) increase smallest (kS=0.067 mg/m2). thermoinitiated formation AdCs assumed not proportional area, their chemical structure reactivity determined temperature.
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ژورنال
عنوان ژورنال: Voda ì vodoo?isnì tehnologìï
سال: 2021
ISSN: ['2521-151X', '2218-9300']
DOI: https://doi.org/10.20535/2218-930012021233672