Low-cost iron-doped catalyst for phenol degradation by heterogeneous Fenton
Low-cost iron-doped catalyst for phenol degradation by heterogeneous Fenton
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DOI：
10.1016/j.jhazmat.2018.07.018
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发表时间：
2018-10-05
影响因子：
13.6
通讯作者：
de Souza, Antonio A. Ulson
中科院分区：
文献类型：
--
作者：
Leal, Tarcisio W.;Lourenco, Luis A.;de Souza, Antonio A. Ulson
这项工作的目的是研究纺织污泥作为前体通过化学和热处理制备催化湿式过氧化物氧化（CWPO）催化剂的可行性。通过物理化学和金属成分分析对纺织污泥进行了表征。使用硫酸铁评估化学活化，并在真空热解反应器中在720℃下进行热处理。选取铁含量为1.5%和5.6%的两种催化剂。评估了工艺参数对苯酚CWPO的影响，并在pH 3和60℃下观察到使用3 g L-1含5.6%铁和11.8 mmol L-1 H2O2的催化剂最大程度地去除苯酚和TOC。金属分析表明，纺织污泥适合用作铁催化剂和吸附剂。催化剂表征表明具有合理的表面积、发达的微孔以及碳质基质中存在赤铁矿结构。降解过程在150 min的反应时间内实现了98.2%的苯酚转化、68.2%的矿化和2.11 mg L-1的铁浸出。该催化剂在最多 5 个使用周期内表现出活性，但效率有所损失。
The aim of this work was to study the feasibility of textile sludge as a precursor to prepare catalysts for catalytic wet peroxide oxidation (CWPO) by chemical and thermal treatments. Textile sludge was characterized by physical-chemical and metal composition analyses. The chemical activation was evaluated using iron sulfate and the thermal treatment was carried out at 720 degrees C in a vacuum pyrolysis reactor. Two catalysts with iron contents of 1.5% and 5.6% were selected. Process parameters influence on CWPO of phenol were evaluated and a maximum removal of phenol and TOC was observed at pH 3 and 60 degrees C, using 3 g L-1 of the catalyst containing 5.6% of iron and 11.8 mmol L-1 of H2O2. Metal analysis indicated that the textile sludge is suitable to be employed as both iron catalyst and adsorbent. The catalysts characterization indicated a reasonable surface area with a well-developed microporosity and the presence of Hematite structures in the carbonaceous matrix. The degradation process achieved 98.2% of phenol conversion, 68.2% of mineralization and 2.11 mg L-1 of iron leaching in 150 min of reaction. The catalyst presented activity for up to 5 cycles of use, but with loss of efficiency.