摘要
研究了粉煤灰去除废水中铜离子的速率、粉煤灰投加量对粉煤灰去除废水中铜离子的影响和粉煤灰对质量浓度不同的含铜离子废水的去除效果,进一步探讨了粉煤灰去除铜离子的机理,实验结果显示粉煤灰在去除废水中铜离子的过程中反应3h后就达到了平衡,粉煤灰对Cu2+的去除率随粉煤灰投加量的增加而增加,但是就充分利用吸附剂粉煤灰的角度而言,并非其投加量越多去除量越大,粉煤灰吸附废水中的铜离子更符合Langmuir模型,而不是Freundlich模型;粉煤灰去除废水中的Cu2+主要是静电吸附、阳离子交换吸附和表面络合吸附作用,但是,当用碱性粉煤灰处理质量浓度较低的含Cu2+废水时,生成Cu(OH)2的沉淀作用可能占主要的地位。
Fly ash is a kind of solid waste formed by coal combustion. The main chemical compositions of fly ash are SiO_2 and Al_2O_3. Due to its porosity and its big specific surface area, fly ash has a well capability of adsorption. This paper studied removal Cu^(2+) from wastewater by fly ash in different conditions, including the velocities of removal, the dosage of fly ash, the different concentrations of Cu^(2+). The mechanism of removal was further discussed. The results showed that it took 3 hours to reach the reaction equilibrium. The removal ratio was increase with the increase of adsorbent dosage. But removal quantity did not change as same as the removal ratio. The experimental data fit the Langmuir isotherm formula much better than it of Freundlich. The primary removal mechanisms of copper ions by fly ash are electrostatic attraction adsorption, cation exchange adsorption and surface complex adsorption. However, when concentrations of Cu^(2+) ions were relatively low, and the PH of the wastewater was over 7, the precipitation of Cu(Ⅱ) was dominant in the removal of copper.
出处
《地质科技情报》
CAS
CSCD
北大核心
2004年第3期89-92,96,共5页
Geological Science and Technology Information
基金
教育部优秀青年教师教学科研奖励计划资助项目
关键词
粉煤灰
吸附
含铜废水
沉淀作用
fly ash
adsorption
copper ion from wastewater
precipitation action
