摘要
用铁/铝盐水解法制备了凹凸棒石/铝氢氧化物(PNCMⅠ)、凹凸棒石/铁氢氧化物(PNCMⅡ)和凹凸棒石/铁-铝氢氧化物(PNCMⅢ)3种凹凸棒石黏土纳米复合材料,对比研究了这3种复合材料和纯凹凸棒石黏土对水中磷的吸附净化能力,通过等温吸附实验探讨了3种纳米复合材料对磷的吸附机理。结果表明:PNCMⅠ和PNCMⅢ凹凸棒石黏土纳米复合材料对磷具有良好的吸附净化能力,而且温度对其影响很小;当初始浓度为1,2mg/L和5mg/L(以磷计)时,100mL水中加入0.1g的PNCMⅠ和PNCMⅢ对磷的去除率可达到99%以上,对磷的吸附容量分别约为8mg/g和15mg/g;这3种凹凸棒石复合材料吸附过程均属于Langmuir吸附;PNCMⅠ和PNCMⅢ对磷的吸附是吸热的化学吸附和物理吸附并存的过程,PNCMⅡ对磷的吸附是吸热的物理吸附过程,且都为熵增加的吸附过程。
The adsorption capacities and mechanisms of three kinds of palygorskite nanometer composite materials（aluminum hydrate,iron hydrate,and aluminum and-iron hydrate） coated on palygorskite（PNCM I,PNCM II and PNCM III）,and pure palygor-skite adsorbing phosphate are investigated.The results demonstrate that PNCMⅠ and PNCM Ⅲ are able to effectively remove phosphate from solution.Temperatures do not appear to affect the removal efficiency of PNCMⅠand PNCM Ⅲ.The adsorption isotherms of the three kinds of palygorskite nanometer compound materials could be fitted to Langmuir isotherms equation.The phosphate adsorption on PNCMⅠand PNCM Ⅲ are spontaneous and endothermic,and the physical adsorption and chemical adsorption coexist.PNCMⅡ is spontaneous,endothermic and exhibits physical adsorption.They are entropy-increasing processes of palygorskite nanometer compound materials.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第10期1673-1677,共5页
Journal of The Chinese Ceramic Society
基金
国家"863"计划(2007AA06Z118)
国家自然科学基金(40772031)
安徽省科技厅重大专题(07020303062)资助项目
关键词
凹凸棒石
吸附
磷
热力学
palygorskite
adsorption
phosphate
thermodynamic
