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首页> 外文期刊>RSC Advances >Solar-light-active mesoporous Cr–TiO2 for photodegradation of spent wash: an in-depth study using QTOF LC-MS
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Solar-light-active mesoporous Cr–TiO2 for photodegradation of spent wash: an in-depth study using QTOF LC-MS

机译：太阳光活化的中孔Cr–TiO2用于废洗液的光降解：使用QTOF LC-MS的深入研究

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A dark-coloured effluent called “spent wash” is generated as an unwanted product in sugarcane-based alcohol distilleries. Most distilleries discharge this effluent into soil or water without any treatment, causing water and soil pollution. Herein, we report chromium-doped TiO _(2) (Cr–TiO _(2) ) as a photocatalyst for the degradation of spent wash colour under natural sunlight. Cr-doped TiO _(2) nanoparticles were prepared using an aqueous titanium peroxide-based sol–gel method with titanium isopropoxide as the Ti precursor and chromium nitrate as the Cr precursor. To observe the effect of dopant on sol–gel behaviour and physicochemical properties, the Cr concentration was varied in the range 0.5–5 wt%. The crystallization temperature and time were optimized to obtain the required phase of Cr–TiO _(2) . The physicochemical characteristics of the Cr-doped TiO _(2) catalyst were determined using X-ray diffraction, FE-SEM, FETEM, TG, XPS, the Brunauer–Emmett–Teller (BET) method, FT-IR, Raman, PL, ICP-MS, and UV visible spectroscopy. A shift in the absorption edge of TiO _(2) by doping with chromium suggested an increase in visible light absorption due to a decrease in the effective band gap. The application potential of the Cr–TiO _(2) catalyst was studied in the degradation of sugar-based alcohol distillery waste under natural sunlight, and the results were compared with those of undoped TiO _(2) and Degussa P25 TiO _(2) . Degradation of the spent wash solution was monitored using UV-visible, gel permeation chromatography (GPC), and QTOF LC-MS. GPC and LC-MS showed significant changes in the molecular weight of spent wash colour-forming compounds due to the degradation reaction. QTOF LC-MS analysis suggested that acids, alcohols, glucosides, ketones, lipids, peptides, and metabolites were oxidized to low-molecular-weight counterparts. From the results, 5% Cr–TiO _(2) showed the highest degradation rate among all Cr–TiO _(2) samples, undoped TiO _(2) , and Degussa P25 TiO _(2) under identical reaction conditions, with nearly 68–70% degradation achieved in 5 h.
机译：在基于甘蔗的酒精蒸馏器中，产生了一种黑色的废水，称为“废液”，是一种不需要的产品。大多数酿酒厂未经处理就将废水排放到土壤或水中，造成水和土壤污染。在这里，我们报道了铬掺杂的TiO _（2）（Cr–TiO _（2））作为光催化剂，用于降解自然阳光下的废洗色。 Cr掺杂的TiO _（2）纳米粒子是使用基于过氧化钛的溶胶-凝胶法制备的，其中异丙醇钛为Ti前驱体，硝酸铬为Cr前驱体。为了观察掺杂剂对溶胶-凝胶行为和理化性质的影响，Cr的浓度范围为0.5-5 wt％。优化了结晶温度和时间以获得所需的Cr-TiO _（2）相。使用X射线衍射，FE-SEM，FETEM，TG，XPS，Brunauer-Emmett-Teller（BET）方法，FT-IR，Raman，PL确定了Cr掺杂TiO _（2）催化剂的理化特性。 ，ICP-MS和紫外可见光谱。掺杂铬会导致TiO_（2）的吸收边缘发生偏移，这是由于有效带隙减小导致可见光吸收增加。研究了Cr–TiO _（2）催化剂在自然阳光下降解糖基酒精蒸馏厂废料的应用潜力，并将其结果与未掺杂的TiO _（2）和Degussa P25 TiO _（2）进行了比较。 ）。使用紫外可见光，凝胶渗透色谱（GPC）和QTOF LC-MS监测废洗涤液的降解。 GPC和LC-MS显示由于降解反应，废洗成色化合物的分子量发生了显着变化。 QTOF LC-MS分析表明，酸，醇，糖苷，酮，脂质，肽和代谢产物被氧化为低分子量的对应物。结果表明，在相同的反应条件下，所有Cr–TiO _（2），未掺杂的TiO _（2）和Degussa P25 TiO _（2）样品中5％的Cr–TiO _（2）降解率最高。 5小时内降解率接近68–70％。

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