Co-pyrolyzed and valorized municipal solid wastes and coconut husks into biochar adsorbing methylene blue in aqueous solution

Divine Angela G. Sumalinog , Dennis C. Ong , Jose Antonio I. Pimentel , Ralf Ruffel M. Abarca , Carl Francis Z. Lacson , Nurak Grisdanurak , Sergio C. Capareda , Mark Daniel G. de Luna
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Abstract

The adsorption potential of biochar derived from municipal solid waste (MSW) and coconut husk (CH) for methylene blue (MB) removal was investigated in this study. Both produced biochars exhibited a pHPZC of 8.5 with no observed significant compositional changes (consistent with literature values). The integration of CH in the co-pyrolysis process altered the surface morphology of MSW-BC. Moreover, the post-adsorption images indicated MB deposition on the biochar surfaces. The MCH-BC had 559 m² g−1 specific surface area and about 29 mg g−1 adsorption capacity, and practically indicated superior adsorbent quality than MSW-BC (with corresponding lower values). Furthermore, the adsorption behaviors suggested that the phenomena were (1) potentially influenced by chemisorption from kinetic studies, (2) best fitted the Freundlich isotherm model, denoting a heterogeneous adsorption mechanism, and (3) endothermic and spontaneous from the thermodynamic analysis. The proposed adsorption mechanism was feasibly dominated by physisorption, as indicated by low ΔG° values (−1.234 kJ mol⁻¹ to −4.531 kJ mol⁻¹) and functional groups, likely facilitating hydrogen bonding, which perhaps followed by initially identified chemisorption from kinetic studies. Finally, the study highlighted the potential of co-pyrolyzed MSW and CH biochar as a competitive low-energy synthesis, producing an adsorbent for MB removal.
将城市固体废物和椰子壳共热解和活化成生物炭,在水溶液中吸附亚甲基蓝
研究了从城市生活垃圾(MSW)和椰子壳(CH)中提取的生物炭对亚甲基蓝(MB)的吸附潜力。两种生物炭的pHPZC均为8.5,没有观察到显著的成分变化(与文献值一致)。CH在共热解过程中的整合改变了MSW-BC的表面形貌。此外,吸附后图像显示MB沉积在生物炭表面。MCH-BC的比表面积为559 m²g−1,吸附量为29 mg g−1,吸附质量优于MSW-BC(吸附量较低)。此外,吸附行为表明:(1)动力学研究可能受到化学吸附的影响,(2)最适合Freundlich等温线模型,表明非均相吸附机制,(3)热力学分析表明吸热自发。所提出的吸附机制可能以物理吸附为主,如ΔG°值低(- 1.234 kJ mol⁻¹至- 4.531 kJ mol⁻¹)和官能团所表明的那样,可能促进氢键,这可能是最初从动力学研究中确定的化学吸附。最后,该研究强调了城市生活垃圾和甲烷生物炭共热解作为一种具有竞争力的低能量合成方法的潜力,它可以产生一种去除MB的吸附剂。
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