天然闪锌矿可见光催化还原甲基橙的试验研究-矿物岩石地球化学通报.PDF

# # Bu lletin of M ineralogy , Pet rology and Geoch emis t ry V ol. 25 No . 4, Oct . 2006 李 艳, 鲁安怀, 王长秋 , 100871 本文研究了可见光下天然闪锌矿的光催化还原能力, 通过可见光下天然闪锌矿 甲基橙的光催化降解实验讨论了天 然闪锌矿晶格中的杂质缺陷导带能级位置光生空穴捕获剂和溶液pH 值 可见光催化降解效率的影响结果表明, 在抗坏 血酸做空穴捕获剂的条件下, 经2 h 的可见光催化实验, 甲基橙能被天然闪锌矿完全还原降解天然闪锌矿晶格中丰富的杂 质缺陷在禁带中形成杂质能级, 可将闪锌矿 光的响应拓展到可见光的波长范围与天然金红石相比, 闪锌矿 甲基橙的较 强光催化还原降解效果与其导带电子更负的氧化还原电势有关此外, 空穴捕获剂和p H 值的选择都是影响催化效果的关键 因素天然闪锌矿在可见光催化降解污染物领域颇有应用前景 闪锌矿; 可见光; 光催化; 导带 O 62 1. 25+ 1 A 1007- 2 802( 200 6) 04- 0304- 05 An Experimental Study on Photocatalytic Reduction of Methyl Orange by Natural Sphalerite under Visible Light Irradiation L I Y an , L U A n- huai, WA N G Ch ang- qiu S chool of Ear th and Sp ace S ciences , Pek ing Univ er sity , Beij ing 100871, China Abstract T he photocatalyt ic reduct ive capabilit y of natural sphalerit e und er visible light w as stu died in t his paper . T he eff ect s of impurit y defects in th e cry stal latt ices of natural sp halerite, con duction band energy level, hole-scav- enger and pH value on t he ef ficiency of ph ot ocat alyt ic degradat ion of m ethyl orange by natural s phalerite under visi- b le ligh t h ave been discu ssed based on a series of experim ent al result s. T h e result s indicat e that, on th e con dit ion of ascorbic acid as hole scavenger, natural sph alerite perform ed great phot oreductive capability as t he m et hyl orange w as completely reduced by nat ural sph a