It is quite desired to develop an effective and cost-efficient non-noble metal catalyst for the reduction of nitrobenzene compounds. In this work, a novel and highly reactive Cu nanoparticles (CuNPs) embedded straw-graphene composite (Cu-SG) was synthesized via a facile and green one-pot hydrothermal route and then used for p-nitrophenol (PNP) reduction in the presence of NaBH₄ from an aqueous medium. In comparison to the Cu-G (0.42 min^-1), the Cu-SG with hierarchical pore structure and smaller CuNPs exhibited better catalytic property in PNP reduction, especially under the condition of a mass ratio of straw-to-GO = 1 and Cu²⁺ ions dosage = 0.15 mmol (0.93 min^-1). Interestingly, unlike Cl^-, NO₃^- and SO₄^2- ions, the coexisted HCO₃^- ions in solution could crucially accelerate the removal of PNP (1.62 min^-1). This may be since HCO₃^- ions can both ionize and hydrolyze in water, enabling them to regulate and promote the adsorption of PNP to Cu-SG. Besides, the Cu-SG displayed good catalytic stability and can be reused for six consecutive cycles without obvious performance reduction. This study offers insights into addressing both water pollution remediation and agricultural solid waste reuse.

迫切需要开发一种有效且具有成本效益的用于还原硝基苯化合物的非贵金属催化剂。在这项工作中，通过一种简便且绿色的一锅水热法合成了一种新型的高反应性铜纳米粒子（CuNPs）嵌入的稻草-石墨烯复合材料（Cu-SG），然后在存在的情况下用于对硝基苯酚（PNP）的还原。来自水性介质的NaBH ₄溶液。与Cu-G（0.42 min ^-1）相比，具有分层孔结构和较小CuNPs的Cu-SG在PNP还原中表现出更好的催化性能，特别是在秸秆与GO的质量比为1和Cu ²⁺离子剂量= 0.15 mmol（0.93 min ^-1）。有趣的是，不像氯^-，NO ₃^-和SO _4根^2-离子的共存HCO ₃ ^-离子在溶液中可能关键的是加速去除PNP的（1.62分钟^-1）。这可能是因为HCO ₃ ^-离子可既电离并水解在水中，使他们能够调节和促进PNP的吸附成Cu-SG。此外，Cu-SG表现出良好的催化稳定性，可以连续六个循环重复使用，而不会明显降低性能。这项研究为解决水污染修复和农业固体废物再利用提供了见识。