The lignin-based magnetic biochar (LMB) was fabricated with a facile one-step solvothermal method. The spherical Fe₃O₄ was successfully loaded on the lignin-based biochar. LMB could efficiently remove Cr(VI) and Congo red (CR) synergistically with the adsorption of biochar and the catalytic/reduction of Fe₃O₄. LMB showed a removal efficiency of 100 % for Cr(VI) (100 mg/L) at 30 min. The LMB could be a catalyst to activate persulfate (PS) to degrade CR. The LMB + PS system showed a removal efficiency of 94.3 % for CR at 60 min. Moreover, LMB could simultaneously remove 41.5 % of Cr(VI) and 91.5 % of CR in the mixed Cr(VI) and CR solution. The simulated wastewater studies showed that LMB exhibited superior high Cr(VI) (100 %) and CR (82 %) removal efficiencies with the coexistent of anions, cations, and organic matter. LMB can be effectively applied to remove Cr(VI) and CR and purify different contaminated water bodies.

木质素基磁性生物炭 (LMB) 采用简便的一步溶剂热法制备。球形Fe ₃ O ₄成功负载到木质素基生物炭上。_{LMB可与生物炭吸附和Fe 3} O ₄催化/还原协同高效去除Cr(VI)和刚果红(CR). LMB 显示 30 分钟时 Cr(VI) (100 mg/L) 的去除效率为 100%。LMB 可能是激活过硫酸盐 (PS) 以降解 CR 的催化剂。LMB + PS 系统在 60 分钟时对 CR 的去除效率为 94.3%。此外，LMB 可以同时去除 Cr(VI) 和 CR 混合溶液中 41.5% 的 Cr(VI) 和 91.5% 的 CR。模拟废水研究表明，在阴离子、阳离子和有机物共存的情况下，LMB 表现出优异的高 Cr(VI) (100%) 和 CR (82%) 去除效率。LMB可有效去除Cr(VI)和CR，净化不同污染水体。