Characterization of prepared eco‑friendly biochar from almond (Terminalia catappa L) leaf for sequestration of bromophenol blue (BPB) from aqueous solution

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon letters / 31권 / 5호
ㆍ저자명 : Jamiu Mosebolatan Jabar, Ignatius Adekunle Owokotomo, Yusuf Timilehin Ayinde, Ayodele Modupe Alafabusuyi, Gbolahan Olusayo Olagunju, Victor Oluwafemi Mobolaji

목차

Abstract
1 Introduction
2 Experimental
2.1 Materials
2.2 Preparation of adsorbents
2.3 Characterization of adsorbents
3 Results and discussion
3.1 Physicochemical and thermal analysis of the adsorbents
3.2 Fourier transform infrared spectrometry
3.3 Scanning electron microscopy–energy-dispersive X-ray spectrometry (SEM–EDX)
3.4 N2 adsorption–desorption isotherms
3.5 XRD analysis of RAL, ALB and CAL
3.6 Zero potential charges (pHpzc)
3.7 BPB dye adsorption mechanism onto prepared adsorbents
3.8 Adsorption experiments
3.9 Adsorption models
4 Conclusion
Acknowledgements
References

영어 초록

Novel eco-friendly adsorbents were prepared through pyrolysis and acid activation of raw almond leaf (RAL) to form almond leaf biochar (ALB) and chemically activated almond leaf biochar (CAL), respectively. The prepared adsorbents were characterized using TGA, FTIR, SEM–EDX, BET and XRD techniques and their physicochemical properties investigated. RAL, ALB and CAL were utilized for adsorption of BPB dye from aqueous solution using batch technique under optimum conditions. The optimum dye adsorbed by RAL, ALB and CAL were 92.83, 93.21 and 94.89%, respectively at pH 3, dye initial conc. (100 mg/L), adsorbent dose (0.04 g/25 mL), 60 min contact time and 301 K adsorption temperature. Although, Langmuir maximum monolayer adsorption capacities were found to be 365.36, 535.62 and 730.46 mg/g for RAL, ALB and CAL, respectively, but isotherm conformed to Freundlich model. Kinetic study confirmed suitability of pseudo-second-order model with rate constant 9.33 × 10–4, 9.91 × 10–4 and 12.60 × 10−4 g mg−1 min−1 for RAL, ALB and CAL, respectively. Negative values of thermodynamic parameters (ΔG and ΔH) established sequestration process to be spontaneous and exothermic. RAL, ALB and CAL were discovered to be highly efficient adsorbents that could be used in place of expensive commercial adsorbents.

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