Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Ministry of Education, Guilin 541004, China.
School of Environment and Resource, Guangxi Normal University, Guilin 541004, China.
Molecules. 2022 Apr 11;27(8):2464. doi: 10.3390/molecules27082464.
Herein, novel visible light active graphitic carbon nitride (g-CN)/sepiolite fiber (CN/SS) composites were fabricated via a facile calcination route, exploiting melamine and thiourea as precursors, and sepiolite fiber as support, for efficient degradation of organic dye methylene blue (MB). The as-prepared CN/SS composites were characterized by various characterization techniques based on structural and microstructural analyses. The effects of CN loading amount, catalyst dosage and initial concentration of dye on the removal rate of dye under visible light were systematically studied. The removal rate of MB was as high as 99.5%, 99.6% and 99.6% over the composites when the CN loading amount, catalyst dosage and initial concentration of dye were 20% (mass percent), 0.1 g, and 15 mg/L in 120 min, respectively. The active species scavenging experiments and electron paramagnetic resonance (EPR) measurement indicated that the holes (h), hydroxyl radical (·OH) and superoxide radicals (·O) were the main active species. This study provides for the design of low-cost, environmentally friendly and highly efficient catalysts for the removal of organic dye.
本文通过简便的煅烧法制备了新型可见光活性石墨相氮化碳（g-CN）/海泡石纤维（CN/SS）复合材料，以三聚氰胺和硫脲为前驱体，海泡石纤维为载体，用于有效降解有机染料亚甲基蓝（MB）。通过基于结构和微观结构分析的各种特征技术对所制备的 CN/SS 复合材料进行了表征。系统研究了 CN 负载量、催化剂用量和染料初始浓度对可见光下染料去除率的影响。当 CN 负载量、催化剂用量和染料初始浓度分别为 20%（质量百分比）、0.1 g 和 15 mg/L 时，在 120 min 内，复合材料对 MB 的去除率分别高达 99.5%、99.6%和 99.6%。活性物质捕获实验和电子顺磁共振（EPR）测量表明，空穴（h）、羟基自由基（·OH）和超氧自由基（·O）是主要的活性物质。该研究为设计用于去除有机染料的低成本、环保且高效的催化剂提供了依据。
