State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, People's Republic of China.
Nanotechnology. 2011 Jul 29;22(30):305707. doi: 10.1088/0957-4484/22/30/305707. Epub 2011 Jul 1.
A novel nanocomposite photocatalyst, D201-CdS beads (0.70-0.80 mm in diameter), was fabricated for visible light (λ > 420 nm) photodegradation of Rhodamine B (RhB). Sphalerite CdS nanoparticles (5-15 nm) were distributed within the outer layer of D201 for favorable visible light permeation. Ultraviolet-visible spectral changes of RhB solution indicated that efficient RhB photodegradation was achieved by D201-CdS under visible light irradiation. More attractively, negligible photocorrosion of the hybrid catalyst D201-CdS was demonstrated by the constant photodegradation efficiency and negligible CdS leaching during five-cycle batch runs. Besides the higher stability, D201-CdS is superior to CdS in terms of separation. The used nanocomposite can be readily separated from solutions by a simple filtration while a high speed centrifugation is needed for the separation of CdS. The above results suggested that the resultant D201-CdS nanocomposite catalyst is promising for practical application in environmental remediation.
一种新型纳米复合光催化剂 D201-CdS 珠（直径 0.70-0.80 毫米）被制备用于罗丹明 B（RhB）的可见光（λ>420nm）光降解。纤锌矿 CdS 纳米粒子（5-15nm）分布在 D201 的外层，有利于可见光渗透。RhB 溶液的紫外-可见光谱变化表明，D201-CdS 在可见光照射下可实现有效的 RhB 光降解。更吸引人的是，在五轮批处理运行中，混合催化剂 D201-CdS 的光降解效率保持不变，且几乎没有 CdS 浸出，表明其光腐蚀性可忽略不计。除了更高的稳定性外，D201-CdS 在分离方面优于 CdS。用过的纳米复合材料可以通过简单的过滤很容易地从溶液中分离出来，而 CdS 的分离则需要高速离心。上述结果表明，所得的 D201-CdS 纳米复合材料催化剂在环境修复的实际应用中具有广阔的前景。
