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QA-MCM-41吸附剂脱氮除磷性能
Performance of QA-MCM-41 adsorbent for nitrate and phosphate removal
投稿时间:2017-04-02  修订日期:2017-05-11
DOI:10.12030/j.cjee.201704007
中文关键词:  MCM-41  长碳链季铵  氮磷  吸附  介孔材料
英文关键词:MCM-41  quaternary ammonium with long carbon chain  nitrate and phosphate  adsorption  mesoporous material
基金项目:国家自然科学基金资助项目(51578006,51378020)
作者单位
王程斋 1. 北京大学环境科学与工程学院, 北京 100871
2. 北京市新型污水深度处理工程技术研究中心, 北京 100871 
朱志慧 3. 玖筑明睿建筑设计(北京)有限公司, 北京 100089 
王婷 1. 北京大学环境科学与工程学院, 北京 100871 
赵华章 1. 北京大学环境科学与工程学院, 北京 100871
2. 北京市新型污水深度处理工程技术研究中心, 北京 100871 
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中文摘要:
      低浓度氮和磷在污水处理中较难去除,排放至水体会造成水体富营养化。以长碳链季铵为功能基团,将其接枝到自制备的介孔材料MCM-41上,成功制得一种吸附容量大且易再生的脱氮除磷吸附剂(QA-MCM-41)。采用SEM、XRD、BET等方法表征了QA-MCM-41微观形貌;研究了氮磷初始浓度、吸附时间及共存离子对QA-MCM-41吸附氮磷效果的影响;采用等温吸附模型、吸附动力学模型、ATR-IR以及XPS等分析手段探究了吸附反应机理。实验结果表明,QA-MCM-41对氮磷的饱和吸附量分别为20.83 mg·g-1和17.67 mg·g-1,SO42-对QA-MCM-41吸附氮磷的效果并未产生显著影响,吸附剂容易再生且重复利用性能较好。吸附动力学模拟及ATR-IR、XPS分析表明,QA-MCM-41对氮磷的吸附均符合以化学吸附为主导的准二级动力学方程,吸附作用主要依靠离子交换。
英文摘要:
      Low-concentration nitrate and phosphate is difficult to be removed during wastewater treatment processes, which discharged into surface water could cause eutrophication. A novel adsorbent (QA-MCM-41) with easy-regeneration function and high capacity for nitrate and phosphate removal was prepared using self-assembly MCM-41 and quaternary ammonium silane coupling agent with long carbon chain (QA) as materials. The adsorbent was characterized with SEM, XRD and BET. The effects of initial concentration, contact time and coexisting ion on adsorption were investigated. The adsorption isotherms, kinetics, ATR-IR and XPS analysis were conducted to better understand the adsorption mechanisms. The results showed that the adsorption of nitrate and phosphate were well fitted to the Langmuir adsorption isotherms, and the maximum adsorption capacity of nitrate and phosphate were 20.83 mg·g-1 and 17.67 mg·g-1, respectively. SO42- had little influence on the nitrate and phosphate uptake. The adsorbent was easy to be regenerated and reused. Kinetics studies and analysis of ATR-IR and XPS indicated that the adsorption followed the pseudo-second order kinetic model, which suggested that the uptake process might be chemical sorption, and the main mechanism for nitrate and phosphate adsorption were electrostatic interaction and ion exchange.
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