ABSTRACT

Biomass-derived activated carbon was prepared from the agro waste materials, (wild sugarcane (WS) and saw dust (SD)) by chemical activation using phosphoric acid. The crystallinity, morphology, functional groups of the synthesized activated carbon were investigated. The effects of contact time (10–60 min), mass of adsorbent (0.05–0.2 g) and concentrations of CO₂ (1 × 10⁻⁴ to 10 × 10⁻⁴M) were analysed and the optimum adsorption conditions were found. Freundlich, Langmuir, Temkin, Dubinin-Radushkevich and Sips isotherm were used to analyse the adsorption data. The adsorption process was fitted with the Freundlich model. Adsorption capacity of agro waste-based sorbent was 5.225 × 10⁻³mol/g. Thermodynamic parameters, such as ΔH⁰, ΔG⁰, ΔS⁰ , were calculated and it was found that the present system was a spontaneous process. From the kinetic studies, it was inferred that the Pseudo-second-order kinetics describes the kinetics of CO₂ on AC-WSSD with an equilibrium point attained at 50 minutes with a high R² value of 0.9602. The Brunauer Emmett Teller (BET) surface area of 1220 m²/g and an iodine value of 1360 m²/g were better indications for adsorption process. The interaction between CO₂ and functional groups on the surface of the activated carbon was confirmed by FTIR. Desorption studies were carried out for three cycles with an efficiency of 93.2%.

 抽象的

生物质活性炭是由农业废料（野生甘蔗（WS）和锯末（SD））通过磷酸化学活化制备的。研究了合成活性炭的结晶度、形貌、官能团。分析了接触时间（10-60 min）、吸附剂质量（0.05-0.2 g）和CO ₂浓度（1 × 10 ^-4至10 × 10 ^-4 M）的影响，并找到了最佳吸附条件。 Freundlich、Langmuir、Temkin、Dubinin-Radushkevich 和 Sips 等温线用于分析吸附数据。吸附过程符合Freundlich模型。农业废弃物吸附剂的吸附容量为5.225×10 ^-3 mol/g。计算了ΔH ⁰ 、 ΔG ⁰ 、 ΔS ⁰等热力学参数，发现该体系是一个自发过程。从动力学研究推断，伪二级动力学描述了AC-WSSD上CO ₂的动力学，在50分钟时达到平衡点， R ²值为0.9602。 1220 m ² /g 的 Brunauer Emmett Teller (BET) 表面积和 1360 m ² /g 的碘值是吸附过程的更好指标。通过FTIR证实了CO ₂与活性炭表面官能团之间的相互作用。解吸研究进行了三个循环，效率为 93.2%。