Abstract

Bacterial cellulose (BC) is a unique nanofibrous biomaterial, and crystalline cadmium sulphide (CdS) is regarded as one of the most attractive visible light-driven photocatalysts. In this study, a BC@CdS nanocomposite for photocatalytic degradation of organic dye methylene blue (MB) was prepared with a facile and highly efficient strategy. The nanocomposite was prepared through a designed “anchoring-reacting-forming” pathway. SEM images showed that the BC-alcogel was the best matrix for nano-fabrication on which nanosized CdS particles were homogeneously distributed (approximately 100 nm). The results from FT-IR, XRD and XPS revealed that the CdS nanoparticles, mainly cubic and hexagonal crystallite, are attached to the BC fibers via coordination effect. The BC-supported adsorbent photocatalytic material was easy to be recycled and followed a new “adsorption–accumulation–degradation” mechanism of photocatalytic degradation. The results showed BC matrix had a strong adsorption effect on MB molecules, which improved local concentration of MB and promoted the rate of photocatalytic reaction. This novel adsorbent photocatalytic nanocomposite material (contained 12.4% CdS, about 0.91 mg for degradation experiment) possessed highly efficient photocatalytic activity with 77.39% removal of MB after 180 min visible light irradiation (the degradation rate was 28.3% mg⁻¹ h⁻¹), and exhibited satisfactory cyclic utilization with slight attenuation. Therefore, BC@CdS nanocomposite is a novel promising candidate as adsorbent photocatalysts with visible light response.

Graphic abstract

中文翻译：

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微波辅助溶剂热法在细菌纤维素基质上原位合成CdS纳米粒子用于光催化应用

摘要

细菌纤维素（BC）是一种独特的纳米纤维生物材料，晶体硫化镉（CdS）被认为是最有吸引力的可见光驱动光催化剂之一。在这项研究中，采用一种简便高效的策略制备了一种用于光催化降解有机染料亚甲基蓝（MB）的BC @ CdS纳米复合材料。通过设计的“锚定反应形成”途径制备了纳米复合材料。SEM图像表明，BC-凝胶是纳米加工的最佳基质，纳米CdS颗粒均匀分布（约100 nm）。FT-IR，XRD和XPS的结果表明，CdS纳米粒子（主要是立方和六方晶）通过配位效应附着在BC纤维上。BC负载的吸附剂光催化材料易于回收利用，并遵循了光催化降解的新“吸附-累积-降解”机理。结果表明，BC基质对MB分子具有很强的吸附作用，提高了MB的局部浓度，提高了光催化反应的速率。这种新型的吸附剂光催化纳米复合材料（包含12.4％CdS，约0.91 mg用于降解实验）具有高效的光催化活性，可见光照射180分钟后MB的去除率为77.39％（降解率为28.3％mg 从而提高了MB的局部浓度，提高了光催化反应的速度。这种新型的吸附剂光催化纳米复合材料（包含12.4％CdS，约0.91 mg用于降解实验）具有高效的光催化活性，可见光照射180分钟后MB的去除率为77.39％（降解率为28.3％mg 从而提高了MB的局部浓度，提高了光催化反应的速度。这种新型的吸附剂光催化纳米复合材料（包含12.4％CdS，约0.91 mg用于降解实验）具有高效的光催化活性，可见光照射180分钟后MB的去除率为77.39％（降解率为28.3％mg^-1  h ^-1），并表现出令人满意的循环利用率，衰减很小。因此，BC @ CdS纳米复合材料是一种新型的有前途的候选材料，具有可见光响应性。

图形摘要