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Author: search.filters.author.Chuangchote, SurawutSubject: search.filters.subject.Biomass conversion

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    Xylitol and gluconic acid productions via photocatalytic-glucose conversion using TiO2 fabricated by surfactant-assisted techniques: Effects of structural and textural properties
    (2017-08-01)
    Payormhorm, Jiraporn
    ;
    Chuangchote, Surawut
    ;
    Kiatkittipong, Kunlanan
    ;
    Chiarakorn, Siriluk
    ;
    Laosiripojana, Navadol
    High-value chemicals can be converted from biomass and its derivatives by various methods. In this work, gluconic acid was obtained from photocatalytic conversion of glucose with synthesized TiO<inf>2</inf>. Moreover, another high-value chemical, xylitol, was firstly found from the photocatalysis in this work. Arabinose and formic acid are other co-products obtained from the reactions. Two surfactants, polyethylene glycol (PEG) and cetyltrimethylammonium bromide (CTAB), were used in conventional sol-gel (SG), ultrasonication sol-gel (US), and hydrothermal (HD) methods to fabricate TiO<inf>2</inf> with different structural and textural properties. Appropriate surface area and phase composition of TiO<inf>2</inf> for production of the highest yields of gluconic acid and xylitol were investigated. It was found that all surfactant-assisted fabrications increased surface area and anatase content of TiO<inf>2</inf> photocatalysts, resulting in high glucose conversion and high yields of xylitol, arabinose and formic acid. The highest yield of xylitol (6.45%) was obtained from US/CTAB-TiO<inf>2</inf>. Unfortunately, the yield of gluconic acid did not increase by increasing time, because it was also decomposed during photocatalysis. The moderate photocatalysis was found from SG/PEG-TiO<inf>2</inf> (100% anatase, surface area 5.93 m<sup>2</sup>/g) that provided the highest yield of gluconic acid (7.6%) in 120 min.