水化普通硅酸盐水泥颗粒吸附水中磷酸盐研究.pdf

第16卷第2期
建筑材料学报
Vol. 16, No. 2
年2013年4月
JOURNAL OF BUILDING MATERIALS
Apr.,2013
文章编号:1007-9629(2013)02-0321-06
水化普通硅酸盐水泥颗粒吸附水中磷酸盐研究
任勇翔2,王艳萍3,段晓星1,刘钢4,杨永哲,黄廷林1
西安建筑科技大学环境与市政工程学院,陕西西安710055;2.西安建筑科技大学西部
建筑科技国家重点实验室(筹),陕西西安710055;3.新疆煤炭设计研究院有限责任公司,
新疆乌鲁木齐830000;4.武汉钢铁(集团)公司后勤集团房产公司,湖北武汉430080)
摘要:以水化普通硅酸盐水泥颗粒为吸附剂,研究了时间、温度和粒径等因素对其吸附PO效果
的影响.结果表明:在20℃,粒径0.5~1.0mm,初始PO质量浓度100mg/L条件下,水化普通
硅酸盐水泥颗粒吸附平衡时间为192h,平衡吸附量高达16.06mg/g;经0.25mol/L盐酸活化后,
水化水泥颗粒对PO~的平衡吸附量增至18.54mg/g;粒径2.0~3.0mm的颗粒对PO的吸附
效果优于0.5~1.0mm和5.0~6.0mm的颗粒。吸附过程遵循假二级动力学模型,符合 Freundii
ch等温方程.热力学解析的结果表明:酸活化水化水泥颗粒吸附PO时烩变△I=7.56 kynol,
变△S=0.0416kJ/(mol?K);4,20℃的吉布斯自由能△G分別为一3.98,4.65kJ/mol;酸活
化水化水泥颗粒对PO的吸附是一个以吸热、化学吸附为主,嫡推动且自发的过程
关键词:水化普通硅酸盐水泥;磷酸盐;吸附行为;酸活化;热力学解析
中图分类号:X78
文献标志码:A
doi:10.3969/j.issn.1007-9629.2013.02.025
Behavior of Phosphate Adsorption to the Hydrated Ordinary Portland Cement
REN Yong-xiang 2, WANG Yan-ping", DUAN Xiao-xing, LIU Gang
YANG Yong-he, HUANG Ting-lin
(1. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology
Xi'an 710055, China; 2. State Key Laboratory of Architecture Science and Technology in West China
(Preparatory Stage), Xi'an University of Architecture and Technology, Xi'an 710055, China; 3. Xinjiang
Coal Industry Research Academy Co., Ltd. Urumchi 830000, China; 4. Realty Estate Company
of Logistic Group, Wuhan Iron and Steel(Group) Corporation, Wuhan 430080, China
Abstract: Effects of time, temperature and particle size on phosphate adsorption by the hydrated ordinary
Portland cement (HPC) were studied. The results show that the adsorption equilibrium reach in 192 h and
the adsorption capacity is higher than 16.06 mg/g when the temperature is 20 C, particle size is 0. 5
1.0 mm and the initial concentration is 100 mg/L. The acid activation of HPC can enhance phosphate re
moval and the adsorption capacity of HPC subject to the treatment of 0.25 mol/L of hydrochloric acid, re
sulting in the adsorption capacity increased to 18.54 mg/g. Adsorption capacity of HPC with particle size
of 2. 0-3.0 mm is better than that of 0.5-1. 0 mm and 5.0-6.0 mm. Kinetics data are fitted with pseu
do-second-order model, the behaviour of phosphate adsorption on the particle of HPC could be appropri
ately fitted as Freundlich isotherm. Results of thermodynamic analysis on the phosphate adsorption to the
particle of HPC subjected to the acid activation indicated that the adsorption heat AH is 7.56 KJ/mol, the
entropy△Sis0.0416kJ/(mol?K) and the Gibbs free energy△Gat4Cand20℃Care-3.98kJ/ mol and
收稿日期:2011-10-31;修订日期:2012-06-13
基金项目:住房和城乡建设部科学技术项目计划(2012-k7-21);国家水体污染控制与治理科技重大专项(20092X07212-002004-003);国家
自然科学基金资助项目(50830303)
第一作者:任勇翔(1968-),男,陕西铜川人,西安建筑科技大学教授,博土.E-mail:ryk@xauat.edu.cn