Highly efficient simultaneous removal of Cu(II) and tetracycline (TET) from aqueous solution was accomplished by iron and zinc doped sawdust biochar (Fe/Zn-biochar). The mutual effects and inner mechanisms of their adsorption onto Fe/Zn-biochar were systematically investigated via sole and binary systems, sorption isotherm and adsorption kinetics models. The liquid-film diffusion step might be the rate-limiting step for tetracycline, the interaction of Cu(II) was more likely controlled by both intra particle diffusion model and liquid film diffusion model. The fitting of experimental data with kinetic models, Temkin model indicates that the adsorption process of tetracycline and Cu(II) involve chemisorption, and physico-chemical adsorption, respectively. There exists site competition and enhancement of Cu(II) and tetracycline on the sorption to Fe/Zn-biochar. The results of this study indicate that modification of biochar derived from sawdust shows great potential for simultaneous removal of Cu(II) and tetracycline from co-contaminated water.

中文翻译：

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源自木屑的生物炭的改性及其在从水溶液中去除四环素和铜中的应用：吸附机理和建模。

通过铁和锌掺杂的木屑生物炭（Fe / Zn-生物炭）可实现从水溶液中高效同时去除铜（II）和四环素（TET）。通过单一和二元体系，吸附等温线和吸附动力学模型，系统地研究了它们吸附在Fe / Zn-生物炭上的相互作用和内在机理。液膜扩散步骤可能是四环素的限速步骤，粒子内扩散模型和液膜扩散模型都更可能控制Cu（II）的相互作用。实验数据与动力学模型，Temkin模型的拟合表明，四环素和Cu（II）的吸附过程分别涉及化学吸附和物理化学吸附。在吸附Fe / Zn-生物炭上存在场地竞争和Cu（II）和四环素的增强作用。这项研究的结果表明，从木屑中提取生物炭具有巨大的潜力，可从共同污染的水中同时去除Cu（II）和四环素。