粉煤灰综合利用
FLYASH COMPREHENSIVEUTILIZATION
2014NO.3 试验与应用
的吸附性能研究
粉煤灰合成沸石对Cr3+白
Research on the Adsorption Properties of Cr* by Synthesis of Zeolite from Fly Ash
程婷，刘海霞，陈晨”，王志良”
（1.江苏城市职业学院城市科学系，江苏南京210017； 2.江苏科技大学生物与化学工程学院，江苏镇江212018；
3.江苏省环境科学研究院环境工程重点实验室，江苏南京210036）
摘要：利用粉煤灰合成沸石吸附重金属Cr，探讨吸附剂量、初始pH值以及反应温度对Cr吸附效果的影响，同时进行吸附等温线和吸附动力学的数据模拟。结果表明：沸石投加量、初始pH值以及反应温度均对Cr"的去除效果影响显著。随着吸附剂投加量的不断增大，Cr去除效果不断提高，饱和吸附量逐渐减小。初始pH值为4时沸石吸附Cr" 的去除率为100%。反应温度的上升不利于沸石对Cr"吸附，沸石对Cr"的吸附效果随着反应温度的升高逐渐降低。沸石吸附Cr"的过程符合Freundlich吸附等温式；准二级反应动力学方程能较好描述沸石对Cr"的吸附行为。
关键词：三价铬离子；粉煤灰；沸石吸附
中图分类号：TQ649.4+5
文献标识码：A
文章编号：1005-8249(2014)03001504
CHENG Ting', LIU Haixia', CHEN Chen', WANG Zhiliang
1. Department of City Science, Jiangsu City Vocational College, Nanjing 210017;
2. School of Biology and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212018; 3. Jiangsu Provincial Academy of Environmental Science, Key Laboratory of Environmental Engineering, Nanjing 210036
Abstract:The experiment was conducted te examine the adsoption properties of Crthrough symthesizing eolite from coal fly ash. The adsorbent dosage, initial pH and the reaction temperature were investigated in the tests. The adsorption isotherm and kineties equation was also discussed. The results showed that, the adsorbent dosage, initial pH and the reaction temperature had significant effect on the removal of Cr/*, With the increasing of the adsorbent dosage, the removal rate of Cr)* was improved, and the saturated adsorption capacity was deereased gradually. The removal rate of Cr** was 100% when the initial pH was 4, Increasing the reaction temperature was negtive to the adsorption of Cr/*, The removal of Cr* decreased gradually with the raise of reaction temperature, The adsorption process of Cr* aceorded with Freundlich adsorption isothenm. In ad-dition, the reaction of adsorption on zeolite to Cr* matched to the pseudo-second class reaction kineties model.
Key words; Trivalent chromium ion; Coal fly ash; Zeolite; Adsorption
近年来大量重金属污染物排向环境当中，对生态环境和人体健康造成极其不利的影响。因此，水体中重金属的有效去除成为研究热点[1.2]。铬污染主要来自于冶金工业、金属加工、电镀、制革、油漆、印染以及化工等多个行业。粉煤灰是燃煤电厂排放的固体废弃
*基金项目：江苏省环境工程重点实验室开放课题（KF2013001）；江苏省高校自然科学研究资助项目（13KJB610005）；江苏科技大学引进人才科研启动项目(35211107)
通讯作者：程婷，硕士，实验师，E-mailwnchengting@sina-com。
收稿日期：2014-03-06 万方数据
物。粉煤灰来源广泛，价格低廉，具有较大的比表面积和固体吸附剂性能[3.4]。近年来，利用粉煤灰作吸附剂去除水中重金属离子的研究备受关注。已有研究表明，粉煤灰及其合成材料对水中重金属离子具有较好的去除能力[3-]。本文利用粉煤灰合成的Lindetype F(K)（以下简称沸石)为基本吸附材料处理重金属 Cr+,研究吸附剂投加量、初始pH值、反应温度以及反应时间对Cr"吸附效果的影响；同时对吸附数据进行拟合，探讨合成的沸石材料吸附Cr*的吸附等温线与吸附动力学方程。
·15·