天然有机物对 TiO 和活性炭/TiO 复合材料去除 17α-乙炔基雌二醇抑制效果的比较研究。
The comparative study on inhibitory effect of natural organic matters on the TiO and activated carbon/TiO composites for the removal of 17α-ethinylestradiol.
机构信息
Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650500, China.
Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650500, China.
出版信息
Chemosphere. 2023 Aug;333:138930. doi: 10.1016/j.chemosphere.2023.138930. Epub 2023 May 16.
To reduce or eliminate the inhibition effect of natural organic matters (NOMs) in water on TiO photocatalysis for removal of emerging contaminants, four activated carbon/titanium dioxide (AC/TiO) composites with different pore structure were prepared by hydrothermal method. The results showed that anatase TiO particles were uniformly distributed in the pores or onto the surface of activated carbons. The total removal rate of 6 mg L 17α-ethinylestradiol (EE2) on the four AC/TiO composites reached above 90%, 30% higher than that of EE2 on TiO. The degradation rate constants of EE2 on four kinds of AC/TiO were much higher than that on TiO. Further study indicated that the adsorption removal ratio of EE2 on the composites was slightly reduced mainly because competitive adsorption between hydrophilic NOMs (HA and FA) and EE2 molecules when HA and FA coexisted with EE2 in water. But importantly, the obvious inhibitory effect of FA for TiO photocatalysis was eliminated on four composites because the introduction of AC with excellent adsorption capacity can preferentially transfer hydrophobic EE2 molecules onto adsorption sites of TiO/AC composites.
为降低或消除水中天然有机物（NOMs）对 TiO 光催化去除新兴污染物的抑制作用，采用水热法制备了 4 种具有不同孔结构的活性炭/二氧化钛（AC/TiO）复合材料。结果表明，锐钛矿 TiO 颗粒均匀分布在活性炭的孔隙或表面上。4 种 AC/TiO 复合材料对 6mg/L 17α-乙炔基雌二醇（EE2）的总去除率均在 90%以上，比 TiO 上的 EE2 高 30%。EE2 在 4 种 AC/TiO 上的降解速率常数均远高于 TiO。进一步的研究表明，由于亲水性 NOM（HA 和 FA）与 EE2 分子在水中共存时的竞争吸附，复合材料上 EE2 的吸附去除率略有降低。但重要的是，由于引入了具有优异吸附能力的活性炭，可以将疏水性 EE2 分子优先转移到 TiO/AC 复合材料的吸附位上，因此，FA 对 TiO 光催化的明显抑制作用在 4 种复合材料上被消除。
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