Academic Journal

Optimization of heavy metal removal by activated carbon obtained as a co-product from fast pyrolysis of rice husks

التفاصيل البيبلوغرافية
العنوان: Optimization of heavy metal removal by activated carbon obtained as a co-product from fast pyrolysis of rice husks
المؤلفون: Peter Wilberforce Olupot, Joel Wakatuntu, Medard Turyasingura, Joseph Jjagwe, Emmanuel Menya, Mackay Okure
المصدر: Results in Materials, Vol 21, Iss , Pp 100545- (2024)
بيانات النشر: Elsevier, 2024.
سنة النشر: 2024
المجموعة: LCC:Materials of engineering and construction. Mechanics of materials
مصطلحات موضوعية: Rice-husk char, Fast pyrolysis, Activated carbon, Heavy metals, Adsorption optimization, Materials of engineering and construction. Mechanics of materials, TA401-492
الوصف: The realization of a circular economy calls for maximum utilization of existing resources with no recoverable waste after the process cycle. During fast pyrolysis of biomass to produce bio-oil for energy purposes, solid residues in form of bio-char are generated. In this study, residual char after pyrolytic-oil extraction from rice husks was activated using steam at 800 °C to produce activated carbon (AC). The formed AC was characterized and evaluated for removal of heavy metals from contaminated water. Box Behnken Design of Response Surface Methodology was used to optimize the removal of Cu2+, Co2+, Zn2+, Pb2+, and Ni2+ from water. The process conditions were: adsorbent dose (2–12 g/L), contact time (30–180 min) and temperature (25–70 °C). Characterization of AC revealed surface area and pore volume of 407 m2g-1 and 0.22 m3g-1, respectively. For all developed models, adsorbent dose, and contact time were the most significant terms. A linear model best fits Cu2+ remediation, while quadratic models best-fit removals of Co2+, Zn2+, Pb2+, and Ni 2+. Heavy metal removal efficiency increased with increasing adsorbent dose, contact time and temperature. Optimum treatment parameters were: adsorbent dose (11.90 g/L), contact time (172.5 min), temperature (54 °C) with removal efficiencies of 98.2%, 84.1%, 75.3%, 98.1%, 75.7% for Cu2+, Co2+, Zn2+, Pb2+, and Ni2+, respectively. Adsorption data best fitted Langmuir isotherm and pseudo second order models. These results confirm the applicability of AC from pyrolytic-oil residual char for adsorption of heavy metals. Use of AC from residual char in water treatment contributes to circular economy.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2590-048X
Relation: http://www.sciencedirect.com/science/article/pii/S2590048X24000190; https://doaj.org/toc/2590-048X
DOI: 10.1016/j.rinma.2024.100545
URL الوصول: https://doaj.org/article/5f6c5c3b5d4941cb852b1927bdcfa0ec
رقم الانضمام: edsdoj.5f6c5c3b5d4941cb852b1927bdcfa0ec
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:2590048X
DOI:10.1016/j.rinma.2024.100545