不同改性方法对沸石吸附对硝基苯酚能力的影响.pdf

农业环境科学学报2010,29(11:214-220
Journal of Agro-environment Science
不同改性方法对沸石吸附对硝基苯酚能力的影响
单程楠…,唐见,赵海涛,王小治,盛海君,封克
(1.扬州大学环境科学与工程学院,江苏省扬州农业环境安全技术服务中心,江苏扬州225127;2.辽宁省辽阳市环境监测站
辽宁辽阳11100
摘要:利用酸改性、热活化、有机改性及联合改性等方法对沸石进行改性,制备了不同种类的改性沸石。通过紫外分光光度法对这
些改性沸石吸附对硝基苯酚的能力进行检测,并用打描电镜及X射线衍射对改性沸石的结构进行表征,着重比较改性过程中酸改
性和灼烧改性实施顺序不同对沸石吸附能力的影响。结果表明,与500℃灼烧相比,900℃灼烧对沸石吸附能力的提高更为明显,但
对沸石的结构有所破坏。酸改性可以去除沸石所携带的大量杂质,使孔道的连通性更好,从而使酸改性沸石对对硝基翠盼的吸附能
力比灼烧改性沸石高。未经酸洗涤的沸石中所含杂质可能会在灼烧过程中对沸石的结构产生影响,先采用酸改性再结合热活化的
方式对沸石进行改性比较合适。酸改性+热活化(500℃)后再与有机改性结合,可以使改性沸石对对硝基苯酚吸附量大大增加。不同
改性沸石的吸附能力依次为:有机改性沸石>酸热联合改性沸石>酸改性沸石>灼烧(500℃)改性沸石>天然沸石。
关键词:沸石;改性;对硝基笨酚;吸附
中图分类号:X703.5文献标志码:A文章编号:1672-2043(201011-2214-07
Effects of Different Modification Methods on Adsorption Capacity of Zeolite to P-nitrophenol
SILAN Cheng-nan=. TANG Jian. ZILAO Hai-tao. WANG Xiao-zhi, SHENG Hai-jun, FENG Kel
1. College of Envimonmcnlal Seienec and Engine ring. Yangzhou Unive sily; Teehnieal Service Center or Agro-cnvironmcnlal Safely of
Jiangsu Province, Yangzhou 225127, China; 2. Liao ang Environmental Monitoring Station of Liaoning Provincc, Liaoyang I I 1000, China
Abstract: Dilfercnl kinds of modified colite were prepared by several methods, such as acid modificalion, hcal modificalion, acid & heal
joint method and organic modification. Organic zeolite was made by loading Cetyltrimethyl Ammonium Bromide(CTMAB )after acid &heat
join pre-aelivalion Struclures of e dilcrenl modified lilc were hare erized S M and XR and the adsorption capacities o[ modi
fied zeolite were tested. Effects of different order applying acid and heat modification on the modified process on adsorption capacity were
studied. The resulls indicated thal, compared with 500 C calcination, 900 C calcination proecss got highcr adsorption capacity of zeolite, but
destroyed the structure of zeolite. Acid modification method had significant effects on removing impurities carried by zeolite. which developed
connectivity within pores and improved the adsorption capacity of P-nitrophenol significantly. It was proved that acid modification zeolite had
better absoption capacity than calcined zeolite. It was shown that the impurities contained in zeolite without acid washing might change the
zeolite structure during the calcination process. Accordingly it was more appropriate by using acid modification process first. combined with
heal modificalion lo activate zeolite. Il was also proved thal modified zeolite by ulilizing organics modificalion proeess a ler acid&hcal(500
C)joint pre-activation could largely improve the adsorption capacity of P-nitrophenol. The absorption capacity of modified zeolites could be
ranked in order of most to least effective as follows: organic zeolite>acid &heat joint modified zeolite>acid modified zeolite>500 calcined
zeolite>natural zeolite
Keywords: vcolilc: modificalion: P-nilrophenol: adsorption
沸石是一类具有开旷格架的铝硅酸盐矿物,在我国分布广泛。其晶体内部存在许多孔径均匀的孔道和
内表面积很大的空穴,具有独特的吸附、筛分、阻离子
收稿日期:2010-05-07
基金项目:江苏省博士后基金(0802021B);江苏省高校自然科学重大
交换和催化性能山,常被广泛用作吸附剂。天然沸石对
基础研究项目(06KJA15011):汇苏省环境材料与环境工程
水中带有极性的物质有较好的吸收效果,但对于多数
重点实验室项目
在水中呈中性的有机污染物吸附效果不理想,所
作者简介:单程楠(1983-),女,过宁辽阳人,硕士研究生,从事环境修
复材料研究。E
在将沸石应用于污水处理时,通常对沸石进行改性以
通讯作者:封E-mail:fenake(@vzuedu.cn
提高其对污水中有机污染物的吸附能力。常用的沸
万方数括