School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China.
Research Institute of Vegetables, Hunan Academy of Agriculture Sciences, Changsha 410125, China.
Bioresour Technol. 2021 Feb;322:124539. doi: 10.1016/j.biortech.2020.124539. Epub 2020 Dec 16.
Developing a cost-effective and high-efficiency biochar is critical in various environmental applications. Lignin-based materials are natural and abundant adsorbents to heavy metals benefited from their special polyphenol structure and physicochemical properties. In this study, adsorption capacities to Pb(II) by alkali lignin (AL) and its biochar derivative (ALB) were comparatively discussed, and the latter exhibited superior adsorption performance, with a maximum adsorption capacity almost twice that of the former, and a much faster absorption rate. The q value of ALB was significantly superior to that of other reported biochar materials. Pb(II) was mainly adsorbed into ALB in three forms: mineral precipitation, ion exchange, and surface complexation, with complexation and mineral precipitation being the dominant mechanisms of adsorption. This study demonstrates that alkali-lignin derived biochar is a promising material for the remediation of polluted by Pb(II).
开发经济高效的生物炭在各种环境应用中至关重要。木质素基材料是天然且丰富的重金属吸附剂，得益于其特殊的多酚结构和物理化学性质。在这项研究中，比较了碱木质素（AL）及其生物炭衍生物（ALB）对 Pb(II) 的吸附能力，后者表现出优异的吸附性能，最大吸附容量几乎是前者的两倍，且吸附速率更快。ALB 的 q 值明显优于其他报道的生物炭材料。Pb(II) 主要以三种形式被吸附到 ALB 中：矿物沉淀、离子交换和表面络合，其中络合和矿物沉淀是吸附的主要机制。本研究表明，由碱木质素衍生的生物炭是修复 Pb(II)污染的一种很有前途的材料。
