对生物炭进行物理改性以暴露其内部孔隙及其官能团，从而增强铅吸附能力。
Physical modification of biochar to expose the inner pores and their functional groups to enhance lead adsorption.
作者信息
Fahmi Alaa Hasan, Samsuri Abd Wahid, Jol Hamdan, Singh Daljit
机构信息
Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia
Department of Soil Science and Water Resources, College of Agriculture, University of Diyala Diyala Iraq.
出版信息
RSC Adv. 2018 Nov 14;8(67):38270-38280. doi: 10.1039/c8ra06867d.
Biochars have been successfully used to treat wastewater and contaminated soils. The efficiency of biochar as a biosorbent of heavy metals can be increased by reducing the particle size, exposing the inner pores and their functional groups. In this study, the empty fruit bunch biochar (EFBB) of oil palm was separated into three particle sizes, fine (F-EFBB < 50 μm), medium (M-EFBB 250-500 μm) and coarse (C-EFBB > 2000 μm) to compare their physical and chemical characteristics and their adsorption capacity for lead. Results revealed that the F-EFBB had greater surface area and exposed more micropores compared to the other particle sizes. Similarly, the F-EFBB had the most oxygen containing functional groups, CEC, and negative charges as measured by the zeta potential. The F-EFBB had the highest adsorption capacity for Pb, followed by M-EFBB and C-EFBB with the lowest. Therefore, the F-EFBB are able to adsorb more heavy metals as compared to M-EFBB and C-EFBB, as suggested by the more favourable physical and chemical characteristics.
生物炭已成功用于处理废水和受污染土壤。通过减小粒径、暴露内部孔隙及其官能团，可以提高生物炭作为重金属生物吸附剂的效率。在本研究中，油棕空果串生物炭（EFBB）被分为三种粒径，细颗粒（F-EFBB < 50μm）、中颗粒（M-EFBB 250-500μm）和粗颗粒（C-EFBB > 2000μm），以比较它们的物理和化学特性以及对铅的吸附能力。结果表明，与其他粒径相比，F-EFBB具有更大的表面积和更多暴露的微孔。同样，通过zeta电位测量，F-EFBB具有最多的含氧官能团、阳离子交换容量和负电荷。F-EFBB对Pb的吸附能力最高，其次是M-EFBB，C-EFBB最低。因此，如更有利的物理和化学特性所示，F-EFBB比M-EFBB和C-EFBB能够吸附更多的重金属。
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