Messele S A, Soares O S G P, Órfão J J M, Bengoa C, Font J
a Departament d'Enginyeria Química , Universitat Rovira i Virgili , Tarragona , Spain.
b Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE/LCM, Departamento de Engenharia Química, Faculdade de Engenharia , Universidade do Porto , Porto , Portugal.
Environ Technol. 2018 Nov;39(22):2951-2958. doi: 10.1080/09593330.2017.1370021. Epub 2017 Sep 3.
Nitrogen-free and nitrogen-doped carbon xerogel materials, from urea and melamine precursors, were prepared at different pH and evaluated as adsorbents/catalysts in the removal of phenol. Then, zero-valent iron (ZVI) was supported on these carbon xerogel materials and its activity was again evaluated for phenol removal by adsorption and catalytic wet peroxide oxidation (CWPO). The prepared samples were characterized by N adsorption at -196°C, pH at the point of zero charge (pH) and elemental analysis. The textural properties of the N-free and N-doped carbon xerogels are strongly influenced by pH of the preparation solution and precursor used. The presence of ZVI on all carbon xerogel supports improved the phenol removal efficiency. ZVI supported on urea- and melamine-doped carbon xerogels show a good performance, reaching above 87% phenol conversion after 60 min of CWPO. On the contrary, pure adsorption and CWPO using the same materials without the presence of ZVI gives low phenol removal efficiency. A correlation was found between the activity of ZVI catalysts in CWPO and the N-content of the supports.
以尿素和三聚氰胺为前驱体制备了无氮和氮掺杂的碳干凝胶材料，在不同pH值下制备，并作为吸附剂/催化剂用于苯酚的去除进行评估。然后，将零价铁（ZVI）负载在这些碳干凝胶材料上，并再次评估其通过吸附和催化湿式过氧化氢氧化（CWPO）去除苯酚的活性。通过在-196°C下的N吸附、零电荷点的pH值（pH）和元素分析对制备的样品进行表征。无氮和氮掺杂碳干凝胶的结构性质受制备溶液的pH值和所用前驱体的强烈影响。所有碳干凝胶载体上ZVI的存在提高了苯酚去除效率。负载在尿素和三聚氰胺掺杂碳干凝胶上的ZVI表现出良好的性能，CWPO 60分钟后苯酚转化率达到87%以上。相反，使用相同材料在没有ZVI存在的情况下进行纯吸附和CWPO，苯酚去除效率较低。发现ZVI催化剂在CWPO中的活性与载体的N含量之间存在相关性。
