钛铁矿基钛铁酸钾复合材料的原位合成及其光催化性能研究  

In-situ synthesis and photocatalytic properties of ilmenite-based potassium titanate composites

作　　者：彭文静 吴恩辉 李军 李湘 马兰 侯静 徐众 李宏 张远 刘鹏 PENG Wenjing;WU Enhui;LI Jun;LI Xiang;MA Lan;HOU Jing;XU Zhong;LI Hong;ZHANG Yuan;LIU Peng(College of Vanadium and Titanium,Panzhihua University,Panzhihua 617000,China;Vanadium and Ti-tanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province,Panzhihua 617000,China;Sichuan Provincial Engineering Laboratory of Solar Technology Integration,Panzhihua 617000,China;State Key Testing Laboratory of Vanadium&Titanium,Panzhihua 617000,China)

机构地区：[1]攀枝花学院钒钛学院,四川攀枝花617000 [2]钒钛资源综合利用四川省重点实验室,四川攀枝花617000 [3]四川省太阳能利用技术集成工程实验室,四川攀枝花617000 [4]国家钒钛检测重点实验室,四川攀枝花617000

出　　处：《中国有色冶金》2024年第6期41-49,共9页China Nonferrous Metallurgy

基　　金：2022年攀西战略资源创新开发项目(LB-SK-HT23-0432);材料腐蚀与防护四川省重点实验室开放基金项目(2022CL31);绿色催化四川省高校重点实验室开放基金项目(LYJ2102);精细化工助剂及表面活性剂四川省重点实验室项目(2023JXY01);绿色催化四川省高校重点实验室开放基金项目(LYJ2102);太阳能利用技术集成及应用推广四川省高校实验室项目(SN240104)。

摘　　要：本文以钛精矿和无水碳酸钾为原料,通过氧化焙烧工艺原位合成钛铁酸钾复合材料,并对不同焙烧温度条件下制备出的焙烧产物进行表征和光催化降解性能评价。通过XRD、XPS、UV-Vis和SEM对焙烧产物的物相组成、价态、光谱吸收和微观形貌进行表征。结果表明,氧化焙烧后焙烧产物主要由铁酸钾、钛酸钾和钛铁酸钾组成,铁酸钾和钛酸钾不均匀附着在钛铁酸钾晶体表面;铁和钛元素分别以Fe^(3+)和Ti^(4+)的形式存在。焙烧温度为750℃、850℃和950℃时,所合成的钛铁酸钾复合材料的能带间隙分别为1.25 eV、1.15 eV和1.45 eV。光催化性能测试结果显示,随着焙烧温度的增加,焙烧产物对亚甲基蓝的光催化降解性能先升高后降低,在850℃的焙烧获得的钛铁酸钾复合材料达到最优,其降解率值可达98.3%;甲基橙作为污染物时,随着焙烧温度增加,焙烧产物降解效果越好,1000℃时其降解率值为56.6%。In this paper,titanium concentrate and anhydrous potassium carbonate were used as raw materials to synthesize potassium ferrite composites in situ by oxidation roasting process.The roasted products prepared at different roasting temperatures were characterized and their photocatalytic degradation performance was evaluated.The phase composition,valence state,spectral absorption and microscopic morphology of the roasted products were characterized by XRD,XPS,UV-Vis and SEM.The results show that the calcined product after oxidation roasting is mainly composed of potassium ferrite,potassium titanate and potassium titanium ferrite.Potassium ferrite and potassium titanate are unevenly attached to the surface of potassium titanium ferrite crystal;iron and titanium exist in the form of Fe^(3+)and Ti^(4+),respectively;When the calcination temperature is 750℃,850℃and 950℃,the band gaps of the synthesized potassium titanate composites are 1.25 eV,1.15 eV and 1.45 eV,respectively;photocatalytic performance test results show that with the increase of calcination temperature,the photocatalytic degradation performance of calcined products for methylene blue first increases and then decreases,and the potassium titanoferrite composites at 850℃reach the optimum,up to 98.3%;when methyl orange is used as a pollutant,the degradation effect of calcined products is better with the increase of calcination temperature,and the degradation rate can reach 56.6%at 1000℃.

关 键 词：钛精矿 钛铁酸钾 原位氧化 钛铁矿基钛铁酸钾复合材料 光催化降解 

分 类 号：TF125[冶金工程—粉末冶金] TF823[冶金工程—冶金物理化学]