Feedstock type and pyrolysis temperature drive lead(II) adsorption on magnetite-impregnated biochar in aqueous solutions
文献类型： 外文期刊
第一作者： Chen, N.
作者： Chen, N.;Kwak, J.;Nzediegwu, C.;Wang, S.;Chang, S. X.;Wang, S.;Chen, N.;Kwak, J.
作者机构：
关键词： Adsorption isotherm; Heavy metal; Lead(II) removal; Kinetics; Magnetite-activated biochar; Wastewater treatment
期刊名称：INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY （ 影响因子：3.4； 五年影响因子：3.3 ）
ISSN： 1735-1472
年卷期： 2025 年 22 卷 8 期
页码：
收录情况： SCI
摘要： Heavy metals and metalloids in industrial wastewater have long been a concern. Low-cost adsorbents such as biochar are increasingly being promoted for treating industrial wastewater. This study investigated the effects and associated mechanisms of magnetite (Fe3O4) activation on lead (Pb, II) removal from aqueous solutions by biochars pyrolyzed from sawdust, wheat straw, canola straw, and manure pellet at 300, 500, and 700 degrees C. Depending on feedstock type, increasing pyrolysis temperature enhanced Pb(II) adsorption in pristine biochars. However, Fe3O4 activation reduced Pb(II) adsorption by up to 86%, likely due to decreased ash content, pH, and exchangeable cations. Cation exchange and the relative proportion of Ca2+/Mg2+ to K+/Na+ dominated the adsorption process via co-precipitation and outer/inner-sphere complexation. This process, depending on the feedstock type, occurred on either heterogeneous or homogenous surfaces of the biochars, with the data fitting better to the Freundlich or Langmuir model. We conclude that feedstock type and pyrolysis temperature, rather than Fe3O4 activation, are more critical when designing biochars for Pb(II) removal from wastewater. Biochars with higher inorganic fractions and greater proportions of Ca2+/Mg2+ to K+/Na+ should be prioritized for Fe3O4 activation to optimize Pb(II) removal from aqueous solutions.
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