水热法从含钛电炉熔分渣中制备纳米片状结构二氧化钛光催化剂

Hydrothermal preparation of nanoflake structured titanium dioxide photocatalysts from electric furnace molten slag

采用水热法,以氢氧化钠为分离剂,从含钛电炉熔分渣中成功制备出纳米片状结构二氧化钛光催化剂,并探讨了水热反应时间、水热温度以及碱液浓度对分离提取纳米片状结构二氧化钛的影响.随着水热反应时间的延长,水热温度以及氢氧化钠溶液浓度的提高,从含钛电炉熔分渣中分离提取的二氧化钛结晶度越好,微观形貌更趋近于纳米片状结构.水热法处理含钛电炉熔分渣的最佳反应条件是:水热温度高于180℃,水热反应时间大于24 h,碱液浓度达到12 mol·L-1.以制备得到的纳米片状结构二氧化钛为光催化剂,在氙灯光照90 min后,甲基蓝降解率可达81.1%.

Nanoflake structured titanium dioxide was successfully prepared from electric furnace molten slag by using a hydrotherreal method under the condition of alkaline solution. The effects of hydrothermal temperature, reaction time and sodium hydroxide solution concentration on the titanium extraction and morphology were investigated. Relatively pure and better crystallized nanoflake structured titanium dioxide can be obtained with increasing reaction temperature, time and alkaline solution concentration. The optimum preparing conditions are that the hydrothermal temperature is above 180 ℃ , the reaction time is above 24 h and the concentration of NaOH solution is 12 tool. L^-1. Using the as-prepared TiO2 as a photocatalyst, the degradation rate of methyl blue is above 81.1% under a xenon lamp for 90 min.