Tallinn University of Technology, Department of Chemical Engineering, Ehitajate tee 5, 19086 Tallinn, Estonia.
Tallinn University of Technology, Department of Chemical Engineering, Ehitajate tee 5, 19086 Tallinn, Estonia.
Chemosphere. 2017 Mar;171:528-536. doi: 10.1016/j.chemosphere.2016.12.104. Epub 2016 Dec 22.
In the present study, UVA/HO/Fe and UVA/SO/Fe processes were applied to degrade the artificial sweetener, acesulfame (ACE) in ultrapure water (UW), groundwater (GW), and secondary effluent (WW). The degradation time and mineralization of 75 μM of ACE determined the efficacy of the procedures. The results indicated that the UVA-induced HO/Fe and SO/Fe systems are a promising alternative for the removal of ACE from different aqueous matrices as both studied processes completely degraded the target compound at an ACE/oxidant/Fe molar ratio of 1/10/1 and pH 3. In the case of UVA-induced systems application without pH adjustment, the ACE decomposition was achieved only in ultrapure water. The maximum mineralization of ACE in ultrapure water by the UVA/HO/Fe system (molar ratio of 1/10/1) at pH 3 resulted in residual TOC of 18.3%. The oxidative effectiveness of the UVA/SO/Fe system was proved to be mainly formed by the hydroxyl radicals. The obtained results indicate that UVA light can be successfully used for the oxidation of the studied artificial sweetener in various aqueous matrices with carefully adjusted process conditions.
在本研究中，应用了 UVA/HO/Fe 和 UVA/SO/Fe 工艺来降解人工甜味剂乙酰磺胺酸钾（ACE）在超纯水（UW）、地下水（GW）和二级出水（WW）中的含量。降解时间和 75μM 的 ACE 的矿化度决定了这些程序的效果。结果表明，UVA 诱导的 HO/Fe 和 SO/Fe 体系是去除不同水基质中 ACE 的一种有前途的替代方法，因为所研究的两种工艺都能在 ACE/氧化剂/Fe 的摩尔比为 1/10/1 和 pH 3 的条件下完全降解目标化合物。在不调节 pH 值的情况下应用 UVA 诱导系统，ACE 的分解仅在超纯水中实现。在 pH 3 时，UVA/HO/Fe 系统（摩尔比为 1/10/1）使 ACE 最大矿化度达到 18.3%。UVA/SO/Fe 体系的氧化有效性被证明主要是由羟基自由基形成的。研究结果表明，UVA 光可以在仔细调节工艺条件的情况下，成功地用于各种水基质中研究的人工甜味剂的氧化。
