CAJ | 학술논문

在170℃的温和水热条件下,用 Na2 WO 4.2 H 2 O、Bi(NO 3)3.5 H 2 O 为原料,硝酸钠为添加剂辅助制备了三维(3D)花球状钨酸铋粉体.通过改变添加剂的浓度,发现硝酸钠在诱导花球状钨酸铋的生长和自组装过程中起到关键作用.在合适添加剂浓度的基础上,pH 值的变化会对产物的物相和微观形貌有很大的影响.研究结果表明,当 pH 值≤10．8时,产物为Bi2 WO 6,当 pH 值＝12．4时,产物转变为 Bi3．84 W0．16 O 6．24.当 pH 值＝1．2,硝酸钠浓度为4 mol/L 时,获得粉体的比表面积为33．427 m2/g.
재170℃적온화수열조건하,용 Na2 WO 4.2 H 2 O、Bi(NO 3)3.5 H 2 O 위원료,초산납위첨가제보조제비료삼유(3D)화구상오산필분체.통과개변첨가제적농도,발현초산납재유도화구상오산필적생장화자조장과정중기도관건작용.재합괄첨가제농도적기출상,pH 치적변화회대산물적물상화미관형모유흔대적영향.연구결과표명,당 pH 치≤10．8시,산물위Bi2 WO 6,당 pH 치＝12．4시,산물전변위 Bi3．84 W0．16 O 6．24.당 pH 치＝1．2,초산납농도위4 mol/L 시,획득분체적비표면적위33．427 m2/g.
Under a mild heat of 170 ℃,three-dimensional (3D)flower-like Bi2 WO 6 microspheres has been fabri-cated by a sodium nitrate assisted hydrothermal method using Na2 WO 4 .2 H 2 O and Bi(NO 3 )3 .5 H 2 O as pre-cursors.It has been found that sodium nitrate played an important role in directing growth and self-assembly flower-like Bi2 WO 6 microspheres by changing the concentration of the additives.On the basis of appropriate of additive concentration demonstrated that the changing pH value carried a great effect on the morphology and the phase composition of Bi2 WO 6 microspheres.The results indicated the product had always been the Bi2 WO 6 when the pH value was less than 10.8.While transforming the pH =12.4,then the product was converted to Bi3 .84 W0.1 6 O 6 .24 and the BET of the obtained powder was 33.427 m2/g at pH=1.2 and the 4 mol/L sodium nitrate solution.