A rapid preparation method of TiO_2–x by thermal treatment using H₂TiO₃ as the precursor was proposed compared with the static hydrogenation thermal treatment process. Its adsorption properties of arsenic under visible light were explored and investigated as well. Various colors of TiO_2–x were prepared and characterized via XRD, TEM, BET, and so on. The results indicate that the method of rapid preparation is feasible. The TiO_2–x exhibits a larger particle size that varied from 10 nm to 2 μm, and deeper color products were obtained as the treatment temperature increased from 600 to 900 °C. Light yellow TiO_2–x was prepared after increasing the temperature from 600 to 900 °C, Ti₄O₇ and Ti₆O₁₁ with a dark color were formed under a H₂ atmosphere at 1500 °C. The arsenic adsorption performances of some samples under visible light were tested, and reveal a high efficiency of TiO_2–x in the photocatalytic oxidation arsenic adsorption under visible light, the conversion ratio of As(III) photocatalytic oxidation fluctuates around 2.85 mgAsg^–1 h^–1. In the absence of visible light, the adsorption capacities for As(III) and As(V) are 3.7 and 42.7 mg/g, respectively, at pH = 3. Under visible light condition, the adsorption capacity of As(III) increases sharply to 15.6 mg/g, which provides the foundation for a new application of TiO_2–x in the field of arsenic adsorption.

中文翻译：

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可见光下TiO _{2– x的}快速制备及其对砷的光催化氧化

与静态加氢热处理工艺相比，提出了一种以H ₂ TiO ₃为前体的热处理快速制备TiO _{2– x}的方法。还研究了其在可见光下对砷的吸附性能。制备了各种颜色的TiO _{2- x}，并通过XRD，TEM，BET等进行了表征。结果表明该快速制备方法是可行的。TiO _{2– x}的粒径更大，从10 nm到2μm不等，并且随着处理温度从600升至900°C，获得了更深的彩色产物。浅黄色TiO _{2– x}在将温度从600℃升高到900℃之后制备了Ti，在1500℃的H ₂气氛下形成了深色的Ti ₄ O ₇和Ti ₆ O ₁₁。测试了一些样品在可见光下的砷吸附性能，发现TiO _{2– x}在可见光下对光催化氧化砷的吸附效率很高，As（III）光催化氧化的转化率在2.85 mgAsg ^–1 h左右波动。^–1。在没有可见光的情况下，在pH = 3时，As（III）和As（V）的吸附容量分别为3.7和42.7 mg / g。在可见光条件下，As（III）的吸附容量急剧增加。达到15.6 mg / g，这为TiO _{2– x}在砷吸附领域的新应用奠定了基础。