摘要
将野生水华微藻生物质作为吸附材料去除水中Cr(Ⅵ)离子。实验发现温度对去除效率没有显著影响,而pH值和Cr(Ⅵ)离子去除率呈严格负相关。在微藻吸附剂浓度为5.0 g/L、温度25℃、pH值5.0和初始Cr(Ⅵ)离子浓度30.0 mg/L条件下,经过2次吸附可以将水中Cr(Ⅵ)离子降低到0.45 mg/L,去除率达到98.5%。进一步分析表明,溶液中Cr(Ⅵ)浓度随着吸附时间逐步下降,Cr(Ⅲ)浓度会随着吸附时间逐步上升,逐渐接近总Cr浓度,这表明吸附过程中微藻生物质会将部分Cr(Ⅵ)还原成Cr(Ⅲ)。本研究表明,野生水华微藻生物质是一种低成本的吸附材料,可以用于去除废水中Cr(Ⅵ)离子。
Bloom algae biomass was collected and employed as adsorbent for Cr （Ⅵ） removal from aqueous solution. The tests indicate that temperature has no significant influence on adsorption efficiency, while pH of aqueous solution has a strict negative relation with removal rate of Cr （Ⅵ）. The final concentration of Cr （Ⅵ） was reduced to 0.45 mg/L amounting to 98.5% removal rate of initial 30.0 mg/L Cr （Ⅵ） at 25 ℃ and pH 5.0 after twice repeated adsorptions using 5.0 g/L algae biomass. Further analysis finds that concentration of Cr （Ⅲ） increased with adsorption process and reached the value of total content of Cr gradually, indicating redox reaction occurred on the surface of algae cells and Cr（Ⅲ ） was generated from Cr（Ⅵ） partly. The study indicates that bloom algae biomass could be used as a low-cost bio-adsorption materials for Cr（Ⅵ） removal from wastewater.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2014年第10期73-76,85,共5页
Environmental Science & Technology
基金
国家重大科技专项(2009ZX07104-002)
国家自然科学基金(21306233)
