Kinetic and isotherm studies of Acid Orange 7 dye absorption using sulphonated mandarin biochar treated with TETA
نویسندگان
چکیده
Abstract This study contributes to the current state of knowledge by highlighting physical–chemical interactions between biochar and dyes. The removal Acid Orange 7 (AO7) dye a modified obtained from wastes mandarin peels (MPs) has been investigated in this work. A dehydration procedure with 80% H 2 SO 4 under reflux was applied produce an innovative MPs then boiled O followed boiling triethylenetetramine make biochar-C-TETA (MBCT). FTIR, SEM, EDX, BJH, BET, TGA, DTA analyses were investigate MBCT. FTIR analysis showed additional peak that confirmed addition NH group MBCT structure. An amorphous carbon structure also XRD analysis. AO7 solution pH proved give best absorption at 2.0. Significant 99.07% using initial concentration 100 mg/L 0.75 g/L Langmuir (LNR) Freundlich (FRH) isotherm models experimental results. LNR suited handle working data. maximum adsorption capacity ( Q m ) calculated for 312.5 mg/g 0.25 Kinetic studies conducted intraparticle diffusion (IND), film (FD), pseudo-first-order (PFOR), pseudo-second-order (PSOR) models. rate ultimate value linear regression coefficient R > 0.99), PSOR model found ideally describe process. point zero charge (pHPZC) be 10.17. electrostatic attractive-forces sorbent surface positively charged sites negatively anionic molecules primary mechanism sorption dye’s anion absorption. results indicate manufactured adsorbent may useful removing wastewater. can used repeatedly up six cycles without dropping its efficiency.
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ژورنال
عنوان ژورنال: Biomass Conversion and Biorefinery
سال: 2023
ISSN: ['2190-6823', '2190-6815']
DOI: https://doi.org/10.1007/s13399-023-04089-w