Correction for: Dual functionality of TiO2/biochar hybrid materials: Photocatalytic phenol degradation in the liquid phase and selective oxidation of methanol in the gas phase (ACS Sustainable Chemistry and Engineering (2017) 5:7 (6274-6287) DOI: 10.1021/acssuschemeng.7b01251)

Paweł Lisowski, Juan Carlos Colmenares, Ondřej Mašek, Wojciech Lisowski, Dmytro Lisovytskiy, Agnieszka Kamińska, Dariusz Łomot

Research output: Contribution to journalComment/debatepeer-review

Abstract

The authors regret that the Experimental Section(Preparation of Hybrid TiO he authors regret that the Experimental Section 2-Based Biochar Materials) of the original article requires some corrections. There is an error involved in the calculation of the nominal weight ratio percentage of TiO2 which was deposited on carbon materials derived from biomass during fabrication of composite materials. As described in the section, the nominal weight ratio percentage of TiO2 deposited on biochar materials was calculated incorrectly (25 wt % TiO2 instead of 19.33 wt % TiO2). In order to estimate the "real" weight ratio percentage of TiO2 in the best performing composite material TiO2/SWP700 (the correct nominal weight ratio percentage of TiO2 was 19.33%), thermogravimetric analysis (TGA) was performed (Figure 1) under the same conditions as the {figure presented}. calcination step of the composite material synthesis (Ramp I and II), heating it up to 1000 °C and burning off all organic residue (Ramp III). Temperature ramp segments and conditions of the TGA analysis are presented below: Ramp I: 3 °C min-1 to 400 °C Ramp II: Isothermal hold for 300 min Ramp III: 20 °C min-1 to 1000 °C Sample Gas: Air 25.0 mL min-1 Pan: Platinum-HT The descending TGA thermal curve indicates a weight loss occurred. Here, 15.9520 mg of 19.33% wt TiO2/SWP700 was analyzed. It can be estimated that after burning all carbon material derived from biomass up to 1000 °C, 3.0180 mg of residue remained (in fact, there is 18.92% of a "real" weight ratio percentage of TiO2 in the TiO2/SWP700 composite material). It should be recognized that this error does not affect any scientific discussion and conclusions reported in this publication. However, it is our obligation to inform readers about this correction related to the nominal value (especially this one) and the "real" weight ratio percentage of TiO2 which was deposited on biochar materials and improved the quality of this scientific publication. Additionally, there is an unintentional and random error involved in the calculation of the relatively high yield of methyl formate as shown in Figure 11 in the original article. This error {figure presented} was caused by an unfortunate oversight. To eliminate such error (just only related to methyl formate yield), corrected calculations with a slightly lower yield of methyl formate are proposed. Essentially, this unintentional error does not compromise the outcomes of the research which may provide an alternative and sustainable photocatalytic pathway for the synthesis of methyl formate from methanol in the gas phase. In order to ensure that the scientific results are accurate and upto-date, we would like to replace Figure 11 in the original article with Figure 11 here with error bars showing the mean deviation of three experimental results. The addition of error bars in a graph can greatly assist readers in determining correct and reliable results. Moreover, there were some erroneous estimates of the value of band gap energy of composite materials as shown in Table 1 in the original article. These erroneous estimates of band gap energy can be associated with characterization of composite materials (TiO2/biochar materials) showing significant absorption of sub-bandgap energy photons. Additionally, where both components can interact (like biochar materials and TiO2), the resulting spectra may not be a simple sum of the component spectra, and it is hard to split the Kubelka-Munk spectrum into spectra of individual components. Therefore, an appropriate approach to determine the band gap energy should involve the withdrawal of the semiconductor spectrum from the spectral sum. Consequently, the obtained values of band gap energy must be looked at with careful criticism, and additional studies are required to estimate the correct values of bandgap energy (this is a common observed situation in the open literature). Furthermore, in the Acknowledgments of the original article, the authors would like to include M.Sc. Anna Kelm and thank her for the photoluminescence measurements. It should be noted that although the above-mentioned errors do not alter the conclusions drawn in the original article, they constitute essential reference points for comparison with other methods related to preparation of composite materials. This can, in turn, lead to some confusion or incorrect interpretations of the results. The authors would like to sincerely apologize to the editor, the reviewers, and the readers for any inconvenience or confusion which the above-mentioned unintentional errors in the original article may have caused.

Original languageEnglish
Pages (from-to)16933-16934
Number of pages2
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number19
DOIs
Publication statusPublished - 7 Oct 2019

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