Fe/污泥基生物炭持久活化过硫酸盐降解酸性橙G

利用污泥基生物炭（SDBC）固定铁物质制备了一种污泥基非均相催化剂（Fe-SDBC），用于活化过硫酸盐（PS）以降解酸性橙G（OG）.Fe-SDBC/PS体系显示出对OG优异的降解性能.评价了影响降解的因素（Fe-SDBC金属负载量、Fe-SDBC投加量、初始pH值和PS浓度）.并通过X射线荧光光谱仪（XRF）、傅立叶变换红外分析仪（FT-IR）和拉曼光谱仪（Raman）对Fe-SDBC进行了表征.自由基清除剂实验表明，SO₄^·-和OH·自由基均在降解过程中生成，且活化PS历程主要发生在非均质催化剂表面.分析Fe-SDBC活化PS的潜在机理，表明不同形式的铁物质是PS分解的主要贡献者，Fe²⁺/Fe³⁺的转化循环提高了Fe-SDBC持久活化PS的效果.Fe-SDBC循环实验表明其对活化PS具有较好的可重用性，连续3次24h降解高浓度污染物仍能发挥作用.综上所述，Fe-SDBC作为一种污泥基非均相催化剂可以持久活化PS，从而实现OG的降解.

Durable degradation of orange G using persulfate activated by sludge-derived heterogeneous catalyst

A sludge-derived heterogeneous catalyst (Fe-SDBC) was prepared by using sludge-derived biochar (SDBC) -loaded with iron. Fe-SDBC was used to activate persulfate (PS) for orange G degradation (OG). The Fe-SDBC/PS system showed an excellent performance for the degradation of OG. The effects of several key parameters (metal oxides-biochar ratio, Fe-SDBC dosage, initial pH value, PS concentration) on the degradation process were systematically evaluated. Subsequently, Fe-SDBC was characterized by X-ray fluorescence spectrometer (XRF), Fourier transform infrared (FT-IR) and Raman spectroscopy (Raman). The radical scavenger experiments suggested that Both SO₄^·- and OH·contributed to the degradation process and the radicals were mainly generated through heterogeneous mechanism. The mechanism of the Fe-SDBC/PS system was investigated. Apparently, different forms of iron were the main contributors to PS decomposition, and the circulation of Fe²⁺/Fe³⁺ increase the effectiveness of the catalyst to activate the PS. Eventually, recycle tests showed that Fe-SDBC had excellent reusability in activating PS for OG removal. It could still play a role in the degradation of high concentration OG for three successive 24h degradation cycles. In summary, Fe-SDBC was capable of perpetually activating PS and achieved satisfactory OG degradation efficiency