摘要
通过水热法合成了暴露(101)晶面的TiO_(2),通过XRD确定合成产物是纯的锐钛矿相,通过SEM确定合成产物为八面体形貌,高倍形貌图中可以看到(101)面形貌非常规整,每个面都有清楚的边缘,晶体平均尺寸在96.34 nm。晶体比表面积为17.61 m^(2)·g^(-1),晶体上有大量的介孔存在,孔径集中分布在2.5 nm左右,BJH统计平均孔径为15.90 nm。通过吸附实验确定吸附剂对三价砷和五价砷在pH分别为4,7,9的溶液中的吸附平衡时间在150 min。在紫外光催化实验表明在pH=1,2,3,…,13,13.5共14种不同pH值溶液中利用催化剂对三价砷进行催化氧化,在碱性条件下pH=8~12的时候对三价砷的催化效果最好,可以将三价砷催化氧化为五价砷。
TiO_(2) with exposed(101)crystal plane was synthesized by hydrothermal method.The synthesized product was determined to be pure anatase phase by XRD,and the octahedral morphology was determined by SEM.The high-magnification morphology image showed that the(101)surface morphology was very regular,with clear edges on each face,and the average crystal size was 96.34 nm.The specific surface area of the crystal was 17.61 m^(2)·g^(-1),and there were a large number of mesopores on the crystal,with a pore size distribution centered around 2.5 nm.BJH statistical average pore size was 15.90 nm.The adsorption equilibrium time of adsorbent for trivalent arsenic and pentavalent arsenic in solutions with pH values of 4,7 and 9 was determined to be 150 min through adsorption experiments.In the ultraviolet photocatalytic experiment,it was shown that the catalyst had the best catalytic effect on the oxidation of trivalent arsenic in 14 different pH solutions ranging from pH=1,2,3,...,13,13.5,and under alkaline conditions at pH 8 to 12,trivalent arsenic could be catalytically oxidized to pentavalent arsenic.
作者
梁凯
LIANG Kai(Institute of Superlubricity Technology,Research Institute of Tsinghua University in Shenzhen,Guangdong Shenzhen 518000,China)
出处
《广州化工》
2025年第16期67-70,共4页
GuangZhou Chemical Industry
