For highly efficient photocatalytic remediation of organic pollutants, broad-spectrum light response and effective charge separation are two key goals. To achieve these goals, a novel biochar (BC) modified PbMoO₄ composite catalyst was successfully synthesized in situ by combining coprecipitation with pyrolysis treatment of poplar sawdust and the technical feasibility of degradation of tetracycline (TC) with compound photocatalyst prepared from recovered agricultural and forestry residues was preliminarily demonstrated. The characterization demonstrated that the presence of BC narrowed the bandgap, enhanced visible light absorption as well as facilitated charge separation. Three composites (with the mass ratio of PbMoO₄ to BC = 1:4; 1:1; and 4:1, respectively) displayed higher activity than pure PbMoO₄. The results showed that the composite with the PbMoO₄ to BC ratio of 1:4 exhibited the best photocatalytic activity, for 150 mg L⁻¹ TC the removal rate was 61.0%, and the rate constant was 8.1 × 10⁻³ min⁻¹, while the photocatalytic activity of PbMoO₄ was 26.0% and 3.9 × 10⁻³ min⁻¹. The reactions in the presence of radical quenchers indicated that holes (h⁺) and superoxide radicals (O₂⁻) were the dominant active species for photodegradation. In different water matrices, for 150 mg L⁻¹ TC solution the photocatalytic activity of optimal photocatalyst decreased as follows: ultrapure water > artificial sewage > farm sewage > municipal sewage. Moreover, the catalyst exhibited good stability over five cycles. Therefore, BC doped PbMoO₄ provides a useful strategy for improving the photocatalytic ability of PbMoO₄-based photocatalysts and offers a promising method for water purification.

对于有机污染物的高效光催化修复，广谱光响应和有效电荷分离是两个关键目标。为了实现这些目标，通过共沉淀与热解处理杨木屑相结合，以及利用回收的农林回收制备的复合光催化剂降解四环素（TC）的技术可行性，成功地原位合成了一种新型生物炭（BC）改性的PbMoO ₄复合催化剂。残留物得到初步证明。表征表明，BC 的存在缩小了带隙，增强了可见光吸收并促进了电荷分离。三种复合材料（质量比为 PbMoO ₄BC = 1:4; 1:1; 和 4:1) 显示出比纯 PbMoO ₄更高的活性。结果表明，PbMoO ₄与BC 比为1:4的复合材料表现出最好的光催化活性，对于150 mg L ^-1  TC，去除率为61.0%，速率常数为8.1 × 10 ^-3 min ^-1，而PbMoO ₄的光催化活性为26.0%和3.9×10 ^-3 min ^-1。在自由基猝灭剂存在下的反应表明空穴（h ⁺）和超氧自由基（O ₂ ^-) 是光降解的主要活性物种。在不同的水基质中，对于150 mg L ^-1  TC溶液，最佳光催化剂的光催化活性降低如下：超纯水>人工污水>农场污水>城市污水。此外，该催化剂在五个循环中表现出良好的稳定性。因此，BC掺杂的PbMoO ₄为提高PbMoO ₄基光催化剂的光催化能力提供了一种有用的策略，并为水净化提供了一种有前途的方法。