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鸟粪石天然沸石复合材料对水中铅离子的去除
摘要点击 1386  全文点击 577  投稿时间:2018-08-13  修订日期:2018-09-27
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中文关键词  鸟粪石  天然沸石  铅离子  吸附
英文关键词  struvite  natural zeolite  lead  absorb
作者单位E-mail
邓曼君 同济大学环境科学与工程学院, 污染控制与资源化国家重点实验室, 上海 200092 15207145226@163.com 
王学江 同济大学环境科学与工程学院, 污染控制与资源化国家重点实验室, 上海 200092 wangxj@tongji.edu.cn 
成雪君 同济大学环境科学与工程学院, 污染控制与资源化国家重点实验室, 上海 200092  
景焕平 同济大学环境科学与工程学院, 污染控制与资源化国家重点实验室, 上海 200092  
赵建夫 同济大学环境科学与工程学院, 污染控制与资源化国家重点实验室, 上海 200092  
中文摘要
      将一种含鸟粪石的氮磷回收产物(NZ-MAP)应用于水中重金属离子铅的去除.通过XRD、FTIR、SEM/EDS分析手段对NZ-MAP进行表征,并探究投加量、溶液初始pH、反应时间对去除过程的影响.结果表明NZ-MAP材料主要成分为负载有鸟粪石的天然沸石;当投加量为0.4 g·L-1时,最大吸附量为749.74 mg·g-1,同时NZ-MAP对溶液中Pb2+的吸附量随pH的增大呈先增加后趋于平衡的趋势,其去除机理主要为Pb10(PO46(OH)2沉淀作用,且当pH为5.0时效果最佳.该材料对于水中铅离子的去除过程更加符合准二级动力学模型.为深入探讨共存重金属离子对NZ-MAP去除水中铅离子的影响,发现共存Ni2+和Cu2+对NZ-MAP吸附Pb2+的影响较小,共存Zn2+和Al3+明显抑制了NZ-MAP对Pb2+的吸附.研究显示,NZ-MAP材料可高效去除水中铅离子,可为水体中铅离子的去除提供有效的方法
英文摘要
      A nitrogen and phosphorus recovery product (NZ-MAP) containing struvite was applied to remove heavy metal ions and lead from water. NZ-MAP was characterized using XRD, FTIR, and SEM/EDS. The effects of dosage, initial pH, and reaction time on the removal process were investigated. The results show that the main component of NZ-MAP is a natural zeolite loaded with struvite. When the dosage is 0.4 g·L-1, the maximum adsorption amount is 749.74 mg·g-1, and the adsorption of Pb2+ in the solution increases first and then tends to reach a balance with increase of the pH. Its removal mechanism is mainly Pb10 (PO4)6 (OH)2 precipitation, and the effect is best when pH is 5.0. The removal process of Pb2+ from water is more in line with the quasi-two stage kinetic model. In an investigation of the effect of coexisting heavy metal ions on the removal of lead ions in water by NZ-MAP, it was found that coexisting Ni2+ and Cu2+ have little effect on NZ-MAP adsorption on Pb2+. Coexisting Zn2+ and Al3+ obviously inhibit the adsorption of Pb2+ by NZ-MAP. The research shows that NZ-MAP material can remove lead ions from water efficiently, thus offering an effective method for doing this.

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