One-dimensional (1D) hierarchically structured CdS nanoparticles (NPs)/NiO nanofibers (NFs) heterostructures with remarkable removal efficiency for diazo dye Congo red (CR) were fabricated by a stepwise synthesis process, which was involved a chemical bathing deposition combined with calcination, and a microwave-assisted wet chemical reaction. The crystal phases, morphologies, optical absorption properties, and adsorption/photocatalytic activity of as-prepared products were investigated by XRD, FESEM, TEM, high-resolution TEM (HRTEM), N₂ adsorption/desorption isotherms, UV–Vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectrum respectively. The experimental results indicated that binary satellite- core CdS NPs/NiO NFs heterojunctions are comprised of n-type CdS NPs with size of 10–30 nm decorated onto 1D p-type NiO NFs with diameter of 60–180 nm and length up to microns, which are self-assembled by nanoparticles with 30–100 nm in size. The possible formation mechanism for satellite-core structured CdS/NiO heterojunction is proposed. Interestingly, the decolorization efficiency over CdS/NiO heterostructures reached up to 91.2% in removal of aqueous CR at high concentration within 40 min under visible light irradiation, which was approximately 5.2 and 3.8 times as high as that of pure CdS nanocrystals (NCs) and the mixture of NiO NFs and CdS NCs. Furthermore, the possible photocatalytic mechanism was also investigated. The as-designed hybrid CdS NPs/NiO NFs heterostructures exhibited improved photocatalytic activity, which is attributed to the enhancement of the visible light adsorption, the efficient separation of photogenerated electrons and holes, and the high adsorption capacity towards CR molecules, thereby displaying superior visible- light-driven photodegradation of CR in high concentration. This work may provide a green engineering heterojunction technology to develop the advanced multifunctional nanocomposites for their applications in wastewater purification.

通过逐步合成工艺制备了具有重去除重氮染料刚果红（CR）效果的一维（1D）分层结构的CdS纳米粒子（NPs）/ NiO纳米纤维（NFs）异质结构，该过程涉及化学浴沉积与煅烧相结合，以及微波辅助的湿化学反应。通过XRD，FESEM，TEM，高分辨率TEM（HRTEM），N ₂研究了所制备产物的晶相，形貌，光吸收性质和吸附/光催化活性。吸附/解吸等温线，UV-Vis漫反射光谱（DRS）和光致发光（PL）光谱。实验结果表明，二元卫星核心CdS NPs / NiO NFs异质结由大小为10–30 nm的n型CdS NPs装饰在直径为60–180 nm且长度最大为微米的一维p型NiO NFs上，由大小为30–100 nm的纳米粒子自行组装而成。提出了卫星核心结构化CdS / NiO异质结的可能形成机理。有趣的是，在可见光照射下，在40分钟内高浓度去除CR水时，CdS / NiO异质结构上的脱色效率高达91.2％，约为纯CdS纳米晶体（NCs）的5.2和3.8倍。 NiO NF和CdS NC的混合物。此外，还研究了可能的光催化机理。设计的杂化CdS NPs / NiO NFs杂结构表现出改善的光催化活性，这归因于可见光吸附的增强，光生电子和空穴的有效分离以及对CR分子的高吸附能力，从而显示出优异的可见光-高浓度下光驱动的CR的光降解。这项工作可以提供一种绿色工程异质结技术，以开发先进的多功能纳米复合材料，用于其在废水净化中的应用。光生电子和空穴的有效分离以及对CR分子的高吸附能力，从而在高浓度下显示出优异的可见光驱动的CR光降解。这项工作可以提供一种绿色工程异质结技术，以开发先进的多功能纳米复合材料，用于其在废水净化中的应用。光生电子和空穴的有效分离以及对CR分子的高吸附能力，从而在高浓度下显示出优异的可见光驱动的CR光降解。这项工作可以提供一种绿色工程异质结技术，以开发先进的多功能纳米复合材料，用于其在废水净化中的应用。