School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China.
Bioresour Technol. 2018 Oct;265:490-497. doi: 10.1016/j.biortech.2018.06.029. Epub 2018 Jun 15.
Pyrolyzing low-cost agro-waste into biochar is a promising means for waste biomass utilization. This study engineers corn stalk-derived biochar with abundant hydrophilic functional groups as a support material for iron nanoparticles impregnation (nZVI-HCS). Surface chemistry and morphology of nZVI-HCS composites is characterized by SEM, TEM, TG, XRD, FTIR, XPS, and BET techniques, which helps to elucidate the mechanisms of Pb, Cu and Zn removal from single and mixed-metal solutions in batch experiments. Equilibrium adsorption capacities can reach 195.1, 161.9 and 109.7 mg·g for Pb, Cu and Zn at neutral medium after 6-h process, respectively. The engineered biochar with hierarchical pores can impregnate iron nanoparticles, serve as an adsorbent, and enhance metal reduction/precipitation. Rapid removal and high performance can be maintained after five regeneration/reuse cycles. Multiple interaction mechanisms including adsorption, precipitation, reduction and complexation are responsible for metal removal by nZVI-HCS composites, which can be a novel biowaste-derived material for wastewater treatment.
将低成本的农业废弃物热解为生物炭是一种有前途的废物生物质利用方法。本研究以富含亲水性官能团的玉米秸秆衍生生物炭为载体，制备了负载纳米铁颗粒的复合材料（nZVI-HCS）。采用 SEM、TEM、TG、XRD、FTIR、XPS 和 BET 技术对 nZVI-HCS 复合材料的表面化学和形态进行了表征，有助于阐明批式实验中从单一和混合金属溶液中去除 Pb、Cu 和 Zn 的机制。在中性介质中，经过 6 小时的处理，nZVI-HCS 对 Pb、Cu 和 Zn 的平衡吸附容量分别达到 195.1、161.9 和 109.7mg·g。具有分级孔的工程生物炭可以浸渍铁纳米颗粒，用作吸附剂，并增强金属还原/沉淀。经过五次再生/再利用循环后，仍能保持快速去除和高性能。nZVI-HCS 复合材料通过吸附、沉淀、还原和络合等多种相互作用机制去除金属，可作为一种新型的生物废物衍生材料，用于废水处理。
