This very paper focuses on the preparation of an eco-friendly and efficient photocatalyst aiming to degrade organic dyes in wastewater. The cheap and abundant straws were carbonized to prepare porous carbon pieces in this study. A simple hydrothermal method was employed to prepare the porous carbon/CdS (PC/CdS) composite. CdS nanoparticles were anchored on these porous carbon sheets, forming the PC/CdS composite. The composite was annealed at 300, 400, and 600 °C, respectively, and then these samples were characterized by SEM, TEM, XRD, and FTIR. As an important parameter, the porosities of PC and the PC/CdS were characterized by BET method. Particularly, the photo-electronic response of PC/CdS has been characterized by EIS, PL, and transient photocurrent. It is found that the carrier mobility and shape of PC itself and the annealing process improved the photocatalytic activity, as well as adsorption ability. Those composites were able to thoroughly degrade RhB within 90 min under the irradiation of visible light. What is interesting and quite different from other reports is that there was no conjugated part of RhB left in the solution after photocatalytic degradation.

本文的重点是制备一种可降解废水中有机染料的环保高效的光催化剂。在这项研究中，将廉价而丰富的秸秆碳化以制备多孔碳块。采用简单的水热法制备了多孔碳/ CdS（PC / CdS）复合材料。将CdS纳米颗粒固定在这些多孔碳片上，形成PC / CdS复合材料。分别在300、400和600°C下对复合材料进行退火，然后通过SEM，TEM，XRD和FTIR对这些样品进行表征。作为重要参数，用BET法表征了PC和PC / CdS的孔隙率。特别是，PC / CdS的光电响应已通过EIS，PL和瞬态光电流进行了表征。发现PC本身的载流子迁移率和形状以及退火过程改善了光催化活性以及吸附能力。这些复合材料在可见光照射下能够在90分钟内彻底降解RhB。有趣的是，与其他报道完全不同的是，光催化降解后，溶液中没有残留RhB的共轭部分。