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A microwave-activated coal fly ash catalyst for the oxidative elimination of organic pollutants in a Fenton-like process

机译：用于氧化消除氧化消除的微波活化煤粉煤灰催化剂在Fenton的过程中的氧化消除

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Raw coal fly ash was first activated by microwave irradiation to promote its catalytic potential and then used as a Fenton-like catalyst to treat polyacrylamide-contaminated wastewater. The optimal activation conditions of the raw coal fly ash (microwave power = 700 W, irradiation time = 10 min, mixing speed = 120 rpm, and raw coal fly ash loading = 20 g L ~(?1) ) were determined by the orthogonal test. The significance of each effective parameter follows the order: raw coal fly ash loading > microwave power > irradiation time > mixing speed. Microwave irradiation can change the surface morphology and remarkably increase the specific surface area and pore volume. More than 75% of the TOC in the polyacrylamide-contaminated wastewater can be removed under the optimized treatment conditions ([H _(2) O _(2) ] = 12 mg L ~(?1) , catalyst loading = 10 g L ~(?1) , [polyacrylamide] = 200 mg L ~(?1) , T = 313 K). The kinetic study shows that the variation in the catalyst loading and the polyacrylamide concentration can change the degradation path of the polyacrylamide, whereas the variation in the H _(2) O _(2) dosage can accelerate the degradation of polyacrylamide. The Fenton-like process studied herein has a wider optimal pH range (2–5) than that of the classic Fenton process (3). The catalyst has weak catalytic capacity but better catalytic persistence than that of Fe ~(2+) . During the five runs of the catalyst, some heavy metallic and toxic elements (Fe, Al, Ti, Cr, Mn, etc. ) can be detected but under the limits of the GB8978-1996 standard. Leaching can weaken the catalytic capacity ( i.e. , stability) of the catalyst. The catalytic process is caused by the synergism of multiple metals and consists of heterogeneous and homogeneous processes.
机译：原煤粉煤灰首先通过微波辐射激活，以促进其催化潜力，然后用作芬顿催化剂以处理聚丙烯酰胺污染的废水。原煤粉煤灰的最佳活化条件（微波功率= 700W，照射时间= 10分钟，混合速度= 120rpm，以及原煤飞氨酸= 20g l〜（Δ1））由正交确定测试。每种有效参数的重要性遵循订单：原煤粉煤灰加载>微波功率>照射时间>混合速度。微波辐射可以改变表面形态，并显着增加比表面积和孔体积。在优化的处理条件下可以除去聚丙烯酰胺污染废水中的超过75％TOC（[H _（2）O _（2）] = 12mg L〜（α1），催化剂负荷= 10g l 〜（？1），[聚丙烯酰胺] = 200mg L〜（α1），T = 313 k）。动力学研究表明，催化剂负荷和聚丙烯酰胺浓度的变化可以改变聚丙烯酰胺的降解路径，而H _（2）O _（2）剂量的变化可以加速聚丙烯酰胺的降解。本文研究的Fenton样方法具有比经典Fenton方法（3）的更广泛的最佳pH范围（2-5）。催化剂具有弱催化力，但催化持久性比Fe〜（2+）更好。在五次催化剂的运行过程中，可以检测到一些重质金属和有毒元素（Fe，Al，Ti，Cr，Mn等），但在GB8978-1996标准的限度下。浸出可以削弱催化剂的催化力（即稳定性）。催化过程是由多种金属的协同作用引起的，并且由异质和均匀的过程组成。

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