Layered double hydroxide (LDH) materials were widely applied for adsorption and photodegradation of pollutants for wastewater treatment. New efficient LDH materials with adsorption and photodegradation abilities will be promising candidates for pollutants removal. Hence, a series of NiFe-LDH/biochar (NiFe/BC) were fabricated by the coprecipitation method for synergistic adsorption and photodegradation anionic dyes of reactive red 120 (RR120). The removal experiment showed that the addition of an appropriate amount of biochar into NiFe-LDH enhanced the adsorption capacity and its photocatalytic ability. The optimized NiFe/BC2 composite can remove 88.5 % of RR120 under visible light by adsorption and photocatalysis, which was much better than NiFe-LDH (63.3 %) and biochar (2.6 %). The photodegradation kinetic constant of the NiFe/BC2 composite was 3.1 and 104.8 times that of NiFe-LDH and BC. In addition, active species capture experiments and electron spin resonance (ESR) tests revealed the removal mechanisms of NiFe/BC composites for RR120 removal. This work affords a feasible strategy for preparing LDH-based photocatalyst with excellent adsorption and photocatalytic performance for wastewater treatment.

层状双氢氧化物（LDH）材料广泛应用于废水处理中污染物的吸附和光降解。具有吸附和光降解能力的新型高效 LDH 材料将成为去除污染物的有前途的候选材料。因此，通过共沉淀法制备了一系列NiFe-LDH/生物炭（NiFe/BC），用于活性红120（RR120）的协同吸附和光降解阴离子染料。去除实验表明，在NiFe-LDH中加入适量的生物炭增强了吸附能力及其光催化能力。优化后的 NiFe/BC2 复合材料可通过吸附和光催化在可见光下去除 88.5% 的 RR120，远优于 NiFe-LDH（63.3%）和生物炭（2.6%）。NiFe/BC2复合材料的光降解动力学常数为3。是NiFe-LDH和BC的1和104.8倍。此外，活性物质捕获实验和电子自旋共振 (ESR) 测试揭示了 NiFe/BC 复合材料去除 RR120 的去除机制。这项工作为制备具有优异吸附和光催化性能的 LDH 基光催化剂用于废水处理提供了可行的策略。