86 / 2023-07-07 09:43:41

Preparation of nZVI Composite Magnetic Ferric Oxide Materials and Study on the Adsorption Mechanism of TCE

Magnetic Fe3O4;nano-scale zero-valent iron;adsorption;organic matter

Trichloroethylene (TCE) is a kind of representative organic pollutants, which has attracted extensive attention. In response to such issues, this article uses FeCl2 · 4H2O as the iron source, NaOH as the precipitant, and reacts to synthesize nanoparticles under certain pH, temperature, and high-speed stirring conditions in an oxygen-free environment to prepare nano zero valent iron composite magnetic iron oxide materials with crack structures. The physical and chemical properties and structure of the materials were characterized by means of FESEM, HRTEM, EDS, XRD, XPS, and static adsorption experiments were conducted to study the adsorption time The effect of initial concentration and pH value of TCE on the adsorption and removal process. The results showed that as the initial concentration of TCE decreased, the TCE removal rate continued to increase. Although a fixed number of nzVI can only provide a limited number of Active site, the TCE removal rate is still high under the condition of high initial TCE concentration. The initial concentration of TCE is 40mg/L, and the dose of nzVI is 500mg. Without adjusting the pH, the removal rate of TCE can reach over 80% after 60 minutes, with an adsorption capacity of 32.09mg/g, demonstrating good adsorption performance. An acidic environment is conducive to the removal of Cr (VI) by nZVI, and the effect is better at pH=2. The adsorption process of nanometer zero valent iron composite magnetic iron oxide material on Trichloroethylene follows the Langmuir model, which is a single-layer adsorption with physical adsorption as the main method. The results show that the nano zero valent iron composite magnetic iron oxide material has good application prospects in the field of TCE removal from wastewater.