Center for Molecular Science and Engineering, College of Science, Northeastern University, Shenyang 110819, China E-mail:
Fujian Provincial Key Laboratory of Featured Materials in Biochemical Industry, Fujian Province University Key Laboratory of Green Energy and Environment Catalysis, College of Chemistry and Materials, Ningde Normal University, Ningde, Fujian 352100, China.
Water Sci Technol. 2020 Feb;81(4):790-800. doi: 10.2166/wst.2020.162.
In recent years, industrial contaminants and especially organic pollutions have been threatening both environmental safety and human health. Particularly, dibutyl phthalate (DBP) has been considered as one of the major hazardous contaminants due to its widespread production and ecological toxicities. Consequently, reliable methods toward the efficient and environmentally benign degradation of DBP in wastewater would be very desirable. To this end, a novel magnetically separable porous TiO/Ag composite photocatalyst with magnetic FeO particles as the core was developed and successfully introduced to the photocatalytic degradation of DBP under visible irradiation with a fluorescent lamp. The presented work describes the grafting of Ag co-doped TiO composite on the silica-modified porous FeO magnetic particles with a simple and inexpensive chemical co-precipitation method. Through the investigation of the influencing factors including photocatalyst dosage, initial concentration of DBP, solution pH, and HO content, we found that the degradation efficiency could reach 74%. The photodegradation recovery experiment showed that the degradation efficiency of this photocatalyst remained almost the same after five times of reuse. In addition, a plausible degradation process was also proposed involving the attack of active hydroxyl radicals generated from this photocatalysis system and production of the corresponding intermediates of butyl phthalate, diethyl phthalate, dipropyl phthalate, methyl benzoate, and benzoic acid.
近年来，工业污染物，特别是有机污染物，对环境安全和人类健康构成了威胁。特别是邻苯二甲酸二丁酯（DBP）因其广泛的生产和生态毒性而被认为是主要的危险污染物之一。因此，开发可靠的方法来有效且环境友好地降解废水中的 DBP 是非常可取的。为此，开发了一种新型的可磁分离多孔 TiO/Ag 复合光催化剂，以磁性 FeO 颗粒为核，成功地将其引入到荧光灯照射下的 DBP 光催化降解中。本工作描述了通过简单且廉价的化学共沉淀法，在经过硅烷化改性的多孔 FeO 磁性颗粒上接枝掺 Ag 的 TiO 复合。通过考察影响因素，包括催化剂用量、DBP 的初始浓度、溶液 pH 值和 H2O2 含量，发现降解效率可达 74%。光降解回收实验表明，该光催化剂在五次重复使用后，其降解效率几乎保持不变。此外，还提出了一种可能的降解过程，涉及到该光催化体系中生成的活性羟基自由基的攻击和邻苯二甲酸二丁酯、邻苯二甲酸二乙酯、邻苯二甲酸二丙酯、苯甲酸甲酯和苯甲酸等相应中间体的生成。
