University of Oulu

Christophliemk, M.P., Heponiemi, A., Hu, T. et al. Preparation of Porous and Durable Metakaolin-Based Alkali-Activated Materials with Active Metal as Composites for Catalytic Wet Air Oxidation. Top Catal (2022). https://doi.org/10.1007/s11244-022-01775-3

Preparation of porous and durable metakaolin-based alkali-activated materials with active metal as composites for catalytic wet air oxidation

Saved in:
Author: Christophliemk, M. P.1; Heponiemi, A.1; Hu, T.1;
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe202301041417
Language: English
Published: Springer Nature, 2022
Publish Date: 2023-01-04
Description:

Abstract

Novel porous and durable metakaolin-based alkali-activated materials (MK-AAMs) with active metal as composites were produced to degrade bisphenol A (BPA) in catalytic wet air oxidation (CWAO). Two composite producing processes were employed. The first process consisted of mixing metakaolin (MK), a foaming agent and active metal oxide (CuO, MnO₂) in a strongly alkaline solution of K₂SiO₃ and KOH. Paste was cured under microwave radiation to produce porous CuO and MnO₂ composites. A porous blank MK-AAM was produced as described above but without active metal and was used as a reference as well. Cu(OH)₂ composite was produced by refluxing a blank MK-AAM in 0.5 M CuSO₄ solution for 24 h. The specific surface area (SSA) of the reference, CuO, MnO₂, and Cu(OH)₂ composites were 36, 53, 61, 89 m²/g, respectively. Mechanical durability was determined in terms of compressive strength and 2.8, 3.4, 3.2, 3.6 MPa were received, respectively. The activity of the reference and the composites were tested in CWAO at 1 MPa and 150 °C for 5 h by using an aqueous model solution of BPA. Under the optimal conditions for CWAO (pressure: 1 MPa; temperature: 150 °C; initial pH 5–6; c[catalyst]: 4.0 g/L) with Cu(OH)₂ composite, the BPA and total organic carbon (TOC) conversions of 100% and 53% were reached. During 5 h oxidation, the composites degraded due to the combined effect of erosion (1.5 wt%) and active metal (Cu, Mn) leaching (1.1 wt%, 3.6 wt%). It was proposed that BPA can be degraded energy-efficiently via CWAO into less harmful compounds under mild reaction conditions without losing the desired properties of the composites.

see all

Series: Topics in catalysis
ISSN: 1022-5528
ISSN-E: 1572-9028
ISSN-L: 1022-5528
Issue: Online first
DOI: 10.1007/s11244-022-01775-3
OADOI: https://oadoi.org/10.1007/s11244-022-01775-3
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Subjects:
Funding: This work was financially supported by the Maa- ja vesitekniikan tuki ry Foundation.
Copyright information: © The Author(s) 2022. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
  https://creativecommons.org/licenses/by/4.0/