摘要
活性炭与纳米TiO2被用作吸附剂,对模拟含氟离子废水进行除氟实验,考察吸附时间、吸附剂投加量、活性炭与纳米TiO2耦合、pH值、紫外光激发等变量对氟离子去除率的影响。研究结果表明,吸附时间为8 h和1.5h,活性炭和纳米TiO2对氟离子的吸附分别达到平衡。在等温吸附实验中,活性炭（8g）对氟离子最高去除率为53.75%,吸附容量在氟浓度50 mg/L时为0.213mg/g;纳米TiO2（0.8g）对氟离子去除率最高为31.66%,吸附容量在氟浓度50 mg/L时为6.133 mg/g,去除率与投加量均成正相关。活性炭和纳米TiO2投加最佳比例为20∶1,对氟离子去除率达到52.46%;在pH 410的条件下,最佳反应pH为8,在紫外光的激发下,吸附效果能加强2%4%。
In this paper,fluoride ion removal by nano-TiO_2 coupled with activated carbon( AC)was investigated. Removal rate was tested by changing several parameters including adsorption time,amount and type of adsorbent,ratio of nano-TiO_2 and activated carbon,pH,and with or without ultraviolet excitation,etc. The experimental results showed that,the adsorption equilibrium time was 8hrs and 1. 5 hrs for AC and nano-TiO_2 respectively. For isotherms,the highest fluoride removal rate by AC( 8 g) and nano-TiO_2( 0. 8 g) was observed as 53. 75% and 31. 66%; Qe was monitored at0. 213 mg / g and 6. 133 mg / g at 50 mg / L of fluoride,respectively. The best ratio of coupled AC and nano-TiO_2 was 20∶1 where the removal rate was 52. 46%. In the range of pH from 4 to 10,the best removal rate was found when pH = 8. Results also suggested that under ultraviolet excitation,the adsorption efficiency increased by 2%-4%.
出处
《环保科技》
2016年第6期5-8,共4页
Environmental Protection and Technology
基金
贵州民族大学校级科研启动基金项目(No.15XRY010)
贵州省科技厅-贵州民族大学联合基金项目(黔科合LH字[7383]号)
关键词
吸附剂
吸附条件
去除率
吸附容量
adsorbent
adsorption condition
removal rate
adsorption capacity
