Ag-Cu monometallic and bimetallic nanoparticles were prepared directly using aqueous extract of Walsura trifoliata supported on TiO₂. The extract helps in the in situ immobilization of Ag, Cu and Ag-Cu alloy nanoparticles with face-centered cubic structure using phytochemical compounds as template and reducing agent at ambient conditions. The aqueous extract of W. trifoliata flower acts as reducing, binding, dispersion agent and plays a major role in the synthesis of the nanocomposites which was confirmed using GC-MS. The nanocomposite were characterized using UV–Vis, FTIR, XRD, TEM, SAED, EDS, and Raman Spectra techniques. The efficiency of prepared nanocomposite on the catalytic activity for the reduction and degradation of 4-Nitrophenol (4-NP), Methyl orange (MO), and Rhodamine B (Rh B) with sodium borohydride (NaBH₄) were investigated in detail. The Ag-Cu/TiO₂ bimetal nanocomposite exhibit very high activity for the degradation of dyes, confirmed using UV–Vis and HPLC analysis. In addition, Ag/TiO₂, Cu/TiO₂ and Ag-Cu/TiO₂ nanocomposites exhibit good reusability with 100% conversion efficiency of 4-NP, MO and Rh B up to 6 successive cycles. The phytogenic mediated synthesis of metal nanocatalyst supported on TiO₂ makes it an ideal platform for heterogeneous catalytic process and for potential application in a wide range of fields.

使用负载在TiO ₂上的三叶草（Walsura trifoliata）的水提取物直接制备了Ag-Cu单金属和双金属纳米颗粒。提取物有助于在环境条件下使用植物化学化合物作为模板和还原剂原位固定具有面心立方结构的Ag，Cu和Ag-Cu合金纳米粒子。三叶草的水提取物花是还原剂，结合剂，分散剂，并且在纳米复合材料的合成中起着重要作用，这已通过GC-MS进行了证实。使用UV-Vis，FTIR，XRD，TEM，SAED，EDS和拉曼光谱技术对纳米复合材料进行了表征。详细研究了纳米复合材料对硼氢化钠（NaBH ₄）还原和降解4-硝基苯酚（4-NP），甲基橙（MO）和若丹明B（Rh B）的催化活性的效率。经UV-Vis和HPLC分析证实，Ag-Cu / TiO ₂双金属纳米复合材料对染料的降解具有很高的活性。另外，Ag / TiO ₂，Cu / TiO ₂和Ag-Cu / TiO ₂纳米复合材料表现出良好的可重复使用性，在连续6个循环中，4-NP，MO和Rh B的转化率为100％。负载在TiO ₂上的金属纳米催化剂的植物性介导合成使其成为异相催化过程和广泛领域潜在应用的理想平台。