摘要
采用原位沉淀-空气氧化法将锰氧化物负载于大孔强酸性阳离子交换树脂D001上,制备出一种新型锰氧化物-阳离子交换树脂复合材料Mn-D001,并对该材料吸附水中Pb2+、Cd2+、Cu2+的性能进行了深入研究.TEM、XRD以及XPS的分析结果表明,负载的锰氧化物以MnO2的形态存在.基于单一金属离子静态吸附的一元体系实验表明,Mn-D001比D001对Pb2+、Cd2+、Cu2+具有更高的吸附选择性,在高浓度竞争离子Ca2+、Mg2+、Na+共存的情况下,仍能保持较高的重金属去除率;Mn-D001对Pb2+、Cd2+、Cu2+的吸附行为符合准一级动力学模型(R2>0.99)和Langmuir吸附等温线模型(R2>0.99).在温度为303 K时,Mn-D001对3种重金属的饱和吸附容量可分别达到476.19 mg.g-1、243.90 mg.g-1及196.08 mg.g-1,优于原有树脂D001.基于复合重金属离子竞争吸附的二元、三元体系的实验表明,Mn-D001对3种重金属的吸附能力顺序为Pb2+>Cu2+>Cd2+,吸附能力由原有树脂D001以及负载的锰氧化物的性质共同决定.
A simple method of in-suit deposition and air oxidation was used to synthesize a new manganese oxide-cation exchange resin hybrid material（Mn-D001） by coating manganese oxide onto a macroporous strong acid cation exchange resin（D001）.The adsorption property for Pb2＋,Cd2＋and Cu2＋ was tested deeply in single,binary and ternary solution systems,respectively.The results of TEM,XRD and XPS indicated that the form of manganese oxide loaded on the resin was MnO2.In single solution,Mn-D001 had higher adsorption selectivity to Pb2＋,Cd2＋and Cu2＋ than D001,which can be proven by the higher removal rate of heavy metals on Mn-D001 than that of D001 when Ca2＋,Mg2＋ and Na＋ ions coexisted in high concentration.The adsorption of Pb2＋,Cd2＋ and Cu2＋ on Mn-D001 was well described by pseudo-first-order kinetic model and Langmuir isotherm model（R20.99）.And the maximum adsorption capacity of Mn-D001 toward Pb2＋,Cd2＋and Cu2＋ were up to 476.19 mg · g-1,243.90 mg · g-1 and 196.08 mg · g-1 respectively at 303 K,which is superior to D001.The order of competitive adsorption capacity of three heavy metals onto Mn-D001 was Pb2＋Cu2＋Cd2＋,which was deduced through the batch experiments in binary and ternary solution system.The order was determined by the characteristics of both host resin D001 and loaded manganese oxide.
出处
《环境化学》
CAS
CSCD
北大核心
2012年第10期1580-1589,共10页
Environmental Chemistry
基金
水体污染控制与治理科技重大专项(2009ZX07212-001)
浙江省科技条件建设项目(2011F10008)资助
关键词
锰氧化物
阳离子交换树脂
重金属
吸附
manganese oxide
cation exchange resin
heavy metal
adsorption
