Adsorption of Reactive Black-5 by Pine Needles Biochar Produced Via Catalytic and Non-catalytic Pyrolysis

作者：Khan Ayesha; Rashid Audil^*; Younas Rafia

来源：Arabian Journal for Science and Engineering, 2015, 40(5): 1269-1278.

DOI：10.1007/s13369-015-1601-5

• Biochar
• Adsorption
• Catalyst
• Pyrolysis
• Reactive Black-5

Biomass derived biochar is increasingly recognized as an environmental-friendly sorbent to halt organic pollutants. This study explores the opportunity of managing pine needles waste by converting them into biochar sorbent through catalytic and non-catalytic pyrolysis, carried out at 450 A degrees C. The difference in the biochar yield was not very obvious under catalytic and non-catalytic pyrolysis. The obtained biochars were characterized using X-ray diffraction analysis, energy-dispersive X-ray spectroscopy and scanning electron microscopy. Adsorption of Reactive Black-5 (RB-5) in aqueous solution by produced biochar was studied. The effect of adsorbent dose in batch-mode experiments was investigated. The equilibrium adsorption data of RB-5 were analyzed by Langmuir and Freundlich models. Langmuir isotherms best described the adsorption data with higher correlation coefficient R (2) values (R (2) = 0.983, R (2) = 0.995 and R (2) = 0.941). The maximum RB-5 adsorption capacities q (e)(mg g(-1)) of elemental copper and cuprite (Cu-Cu-2 O)-based char, magnetite (Fe3O4)-based char and non-catalytically produced char from Langmuir model were 5.40, 2.82 and 4.37 mg g(-1), respectively at 0.1 g adsorbent dose. These results indicated that the biochars are suitable to be used as an adsorbent for RB-5 removal.

• 出版日期2015-5