In the recent years, direct Z-scheme heterojunctions exhibit an exceptional reactivity in various photocatalytic processes. Hybrid visible light driven photocatalyst consisting of semiconducting metal oxide and conducting polymer have immense capability of destruction of various organic pollutants and production of hydrogen gas as alternative renewable energy source. Herein, a novel hybrid polyaniline/ZnO heterojunction were synthesized by coupling sol-gel and oxidative polymerization of aniline in ultrasonic bath of various intensities for removal of fluorescein dye and producing large amount of hydrogen gas under visible light source. Particularly, the amount of polyaniline plays a pivotal role in optimizing the amount of hydrogen gas produced. The change in the diffraction pattern of Wurtzite ZnO nanoparticles and the remarkable reduction of PL signal intensity suggest the construction of direct Z-scheme heterojunction. The photocatalytic hydrogen production rate estimated on the optimized sample using methanol as scavenger is 9.4 mmolh⁻¹g⁻¹ which is higher than that of bare ZnO nanoparticles. The sample containing 5 wt% polyaniline exhibits photocatalytic degradation rate of fluorescein dye 0.021 min⁻¹ which is ten folds higher than that of bare ZnO. The results of our research work indicate that polyaniline is efficiently enhances the light absorption and providing an additional electrons that combine with H⁺ to produce H₂-gas.

近年来，直接Z方案异质结在各种光催化过程中表现出出色的反应性。由半导体金属氧化物和导电聚合物组成的混合可见光驱动光催化剂具有巨大的破坏各种有机污染物和产生氢气作为替代可再生能源的能力。在此，通过溶胶-凝胶和苯胺在不同强度的超声浴中的氧化聚合反应偶联，合成了新型的聚苯胺/ ZnO杂结，以去除荧光素染料并在可见光下产生大量氢气。特别地，聚苯胺的量在优化产生的氢气的量中起关键作用。纤锌矿型ZnO纳米粒子的衍射图谱变化和PL信号强度的显着降低表明直接Z方案异质结的构建。使用甲醇作为清除剂，在优化的样品上估计的光催化产氢速率为9.4 mmolh^-1 g ^-1高于裸露的ZnO纳米颗粒。含有5wt％聚苯胺的样品表现出荧光素染料的光催化降解速率为0.021min ^-1，比裸ZnO的光催化降解率高十倍。我们研究工作的结果表明，聚苯胺可以有效地增强光吸收，并提供与H ⁺结合产生H _2-气体的附加电子。