ABSTRACT

There is a need to prepare a high-efficient sorbent to remove the recalcitrant tetracycline (TC) in wastewater. Herein, biochar-supported zerovalent iron (BC/ZVI) was fabricated in nitrogen ambience via one-step co-pyrolysis of hematite and pinewood. X-ray diffractometer pattern indicated pinewood catalyzed conversion of hematite to ZVI, which was otherwise transformed to FeO, Fe₃O₄ and ZVI without biomass. Batch sorption results indicated that TC removal capacities at pH 5 were 8.02, 177.70 and 301.39 mg g⁻¹ by BC, ZVI and BC/ZVI, respectively. Overall, BC/ZVI showed excellent TC removal capacity through the complexation with Fe ions, surface adsorption and degradation. Thus, the agricultural and industrial wastes were converted via a one-step co-pyrolysis to a value-added product for highly efficient removal of TC in wastewater.

摘要

需要制备一种高效吸附剂来去除废水中的顽固四环素（TC）。在此，通过赤铁矿和松木的一步共热解，在氮气环境中制备了生物炭负载的零价铁（BC/ZVI）。X 射线衍射仪图案表明松木催化赤铁矿转化为 ZVI，否则转化为 FeO、Fe ₃ O ₄和 ZVI 而没有生物质。批量吸附结果表明，在 pH 5 条件下，TC 去除能力分别为 8.02、177.70 和 301.39 mg g ^-1分别由 BC、ZVI 和 BC/ZVI。总体而言，BC/ZVI 通过与 Fe 离子的络合、表面吸附和降解表现出优异的 TC 去除能力。因此，农业和工业废物通过一步共热解转化为增值产品，用于高效去除废水中的 TC。