A microwave-activated coal fly ash catalyst for the oxidative elimination of organic pollutants in a Fenton-like process.
A microwave-activated coal fly ash catalyst for the oxidative elimination of organic pollutants in a Fenton-like process.
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微波活化粉煤灰催化剂，用于类芬顿过程中氧化消除有机污染物
DOI：
10.1039/c9ra00875f
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发表时间：
2019-03-06
期刊：
影响因子：
3.9
通讯作者：
Li, Shuo
中科院分区：
文献类型：
--
作者：
Wang, Nannan;Xu, Han;Li, Shuo
采用微波活化原煤粉煤灰，提高其催化潜能，并将其作为fenton类催化剂处理聚丙烯酰胺污染废水。通过正交试验确定了原煤粉煤灰的最佳活化条件（微波功率= 700 W，辐照时间= 10 min，搅拌速度= 120 rpm，原煤粉煤灰掺量= 20 g L−1）。各有效参数的重要程度顺序为：原煤粉煤灰负荷>微波功率>辐照时间>搅拌速度。微波辐照可以改变表面形貌，显著增加比表面积和孔隙体积。在最佳处理条件（[H2O2] = 12 mg L−1，催化剂负载= 10 g L−1，[聚丙烯酰胺]= 200 mg L−1,T = 313 K）下，聚丙烯酰胺污染废水的TOC去除率可达75%以上。动力学研究表明，催化剂负载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H2O2用量的变化可以加速聚丙烯酰胺的降解。本文研究的类芬顿工艺比经典芬顿工艺具有更宽的最佳pH范围（2-5）(3)。催化剂的催化能力较弱，但催化持久性优于Fe2+。催化剂在五次运行过程中，可检出部分重金属和有毒元素（Fe、Al、Ti、Cr、Mn等），但在GB8978-1996标准的限制范围内。浸出会削弱催化剂的催化能力（即稳定性）。催化过程是由多种金属的协同作用引起的，由多相和均相过程组成。采用微波活化原煤飞灰作为催化剂，进行了fenton法降解有机物的研究。
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 ([H2O2] = 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 H2O2 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 Fe2+. 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. Raw coal fly ash was activated by microwave irradiation and used as a catalyst for the degradation of organics in a Fenton-like process.
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DOI：
10.3390/ma9070580
发表时间：
2016-07-15
期刊：
Materials (Basel, Switzerland)
影响因子：
--
作者：
Kalaw ME;Culaba A;Hinode H;Kurniawan W;Gallardo S;Promentilla MA
通讯作者：
Promentilla MA
影响因子：
15.1
作者：
Anotai, Jin;Wasukran, Naruemol;Boonrattanakij, Nonglak
通讯作者：
Boonrattanakij, Nonglak
影响因子：
3.1
作者：
Kaur, Rajinder;Goyal, Dinesh
通讯作者：
Goyal, Dinesh
影响因子：
13.6
作者：
Leal, Tarcisio W.;Lourenco, Luis A.;de Souza, Antonio A. Ulson
通讯作者：
de Souza, Antonio A. Ulson
影响因子：
2.5
作者：
Tigue, April Anne S.;Malenab, Roy Alvin J.;Promentilla, Michael Angelo B.
通讯作者：
Promentilla, Michael Angelo B.