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摘要
采用浸渍法将施氏矿物(Sch)负载于ZSM-5型分子筛制备Sch/ZSM-5复合催化剂。利用扫描电子显微镜、EDS能谱仪、比表面积分析仪、X-射线衍射仪和傅里叶红外光谱仪等对其矿相结构进行表征,并结合电化学阻抗谱和循环伏安曲线探究了Sch/ZSM-5活化H2O2去除水体中菲的有效性。结果表明,经ZSM-5改性后的Sch扩散程度提高、团聚减少、比表面积增大,可为反应提供更多活性位点。Sch/ZSM-5具有更高的电子转移速率,更易发生≡Fe (Ⅲ)和≡Fe (Ⅱ)的氧化还原,因此对菲的去除有更高的催化活性。当溶液初始pH为3.0、Sch/ZSM-5质量浓度为1.0 g/L、H2O2质量浓度为150 mg/L、反应时间为3 h时,1 mg/L菲的去除率可达96.13%。循环反应6次后,菲的去除率仍保持在91.24%,证明Sch/ZSM-5具有良好的可重复利用性和稳定性。
Abstract
Through the impregnation method, Schwertmanneite (Sch) is loaded on Zeolites Socony Mobil-5(ZSM-5) type molecular sieve to prepare Sch/ZSM-5 composite catalyst, which is characterized by mean of scanning electron microscope (SEM), specific surface area analysis (BET), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), energy dispersive spectrometer (EDS).Combining with the test results by cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS), the effectiveness of Sch/ZSM-5 with H2O2 in removing phenanthrene from water is investigated.It is shown that the diffusion of ZSM-5 modified-Sch is increased while the agglomeration and specific surface area decrease.The increased specific surface area can provide more active sites for the reaction.Sch/ZSM-5 presents higher electron transfer rate which can make the redox of ≡Fe(Ⅲ) and ≡Fe(Ⅱ) much easier.Therefore, the system has higher catalytic activity for the removal of phenanthrene.The removal rate of phenanthrene (1 mg·L-1) reaches 96.13% after 3 h of reaction when the initial pH of the solution is 3.0, the concentration of Sch/ZSM-5 is 1.0 g·L-1, and the concentration of H2O2 is 150 mg·L-1.After it has been used for 6 cycles of reaction, the removal rate of phenanthrene remains at 91.24%, proving that Sch/ZSM-5 has excellent reusability and stability.
关键词
施氏矿物
/
菲
/
ZSM-5分子筛
Key words
Schwertmanneite
/
phenanthrene
/
ZSM-5 molecular sieve
扩散型改性施氏矿物活化H2O2去除水体中菲的研究[J].
现代化工, 2023, 43(11): 115-120 DOI:10.16606/j.cnki.issn0253-4320.2023.11.023