引用本文:陈方义,杨 昱,常 明,等.过硫酸盐缓释材料释放性能及机理[J].环境科学研究,2013,26(9):995-1000.
CHEN Fang-yi,YANG Yu,CHANG Ming,et al.Release Performance and Mechanism of the Slow-Released Persulfate Materials[J].Research of Environmental Sciences,2013,26(9):995-1000.]
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过硫酸盐缓释材料释放性能及机理
陈方义1,2, 杨 昱1, 常 明1, 姜永海1, 席北斗1, 张进保1, 廉新颖1
1.中国环境科学研究院, 北京 100012 ;2.常州大学环境与安全工程学院, 江苏 常州 510280
摘要:
采用过硫酸钾、水泥、砂和水按照一定配比均匀混和后,于立方体模具中成型制备过硫酸盐缓释材料(A1、A2、A3、A4),参照欧盟标准化组织制定的NEN 7375水槽试验方法,分8个阶段更换浸取液连续浸泡缓释材料,考察过硫酸盐缓释材料的释放性能,并初步探讨其缓释机理. 结果表明:过硫酸盐缓释材料在浸泡初期释放速率较大,短时间内释放速率迅速降低,之后缓慢降低;4种配比缓释材料的过硫酸盐释放特性均满足二级动力学方程;砂的含量水平是影响过硫酸盐释放特性的主要因素之一,砂含量较高的A4材料的传质阻力小,传质系数(K)为58.11mg(d·g),释放过硫酸钾的速率较快;砂含量低的A1、A2材料传质阻力大,传质系数分别为14.59、17.11mg(d·g),过硫酸钾释放速率较慢. 该研究中过硫酸盐缓释材料最长释放时间可达159.08~501.44d,能够有效实现有效组分过硫酸盐的缓慢释放. 总体上,浸泡初期释放机理表现为标准扩散过程,后期为损耗扩散过程.
关键词:  地下水  过硫酸盐  缓释材料  缓释性能  缓释机理
DOI:
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基金项目:国家高技术研究发展计划(863)项目(SS2012AA062025)
Release Performance and Mechanism of the Slow-Released Persulfate Materials
CHEN Fang-yi1,2, YANG Yu1, CHANG Ming1, JIANG Yong-hai1, XI Bei-dou1, ZHANG Jin-bao1, LIAN Xin-ying1
1.Chinese Research Academy of Environmental Sciences, Beijing 100012, China ;2.School of Environmental & Safety Engineering of Changzhou University, Changzhou 510280, China
Abstract:
The release properties of the slow-released persulfate materials in the groundwater pollution remediation were studied. The release mechanism provides a theoretical basis for the development of release model that can evaluate its future release properties. Four kinds of slow-released persulfate materials, A1, A2, A3and A4, were made from the materials mixed by sand, cement, water and potassium persulfate in a cube mould with their certain proportions. Putting the materials in a bottle replacing the solution in eight stages, the structure, release performance and its mechanism were studied. The results showed that, the high release speed followed by rapid attenuation with the temporal variations in [S2O82-], and the release speed slowed down after a certain period. The process of sulfate sustained-release material release potassium persulfate can be modeled by two order kinetics equation, and release curve appeared to show a double reciprocal relationship. Levels of sand content was the the main factor influencing the sulfate release characteristics. A4had a high sand proportion and its mass transfer resistance was weak with potassium persulfate. With a high mass transfer coefficient of 58.11mg(d·g), the release of its potassium persulfate was relatively fast. In contrast, A1and A2had little sand contents and thier mass transfer resistances were stronger with potassium persulfate. The release of the potassium persulfate was relatively slow with a high mass transfer coefficient of 14.59mg(d·g) and 17.11mg(d·g). The slow-released persulfate material can effectively achieve the sustained release effect. The longest time of release can be up to 159.08-501.44d with a ninety-nine percent release rate. The release mechanism included diffusion at front stage and depletion at last stage.
Key words:  groundwater  persulfate  slow-released materials  release performance  release mechanism