牡蛎壳中钙的改性及吸附特性的研究.pdf
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88
材料导报B:研究篇
2012年9月(下)第26卷第9期
牡蛎壳中钙的改性及吸附特性的硏究
刘文,李天华?,张滕军3,王秋娟,陈义芳1,苏秀榕
(1宁波大学海洋学院,宁波315211;2宁波大学材料科学与化学工程学院,宁波315211
3宁波今日食品有限公司,宁波315502)
摘要为提高牡蛎壳的综合利用价值,比较了活化前后蛎壳中钙的结构特征和成分变化,分析了其吸附性
能,初步研究了对果红染朴的吸附效果。利用牡蛎壳为原料经活化处理制备出一种新型高效吸附材料,采用原子
吸收法测定其总钙含量,利用扫描电镜(SEM)、热重分析仪(TG)、粉末X射线衍射仪(XRD)和傅里叶变換红外光语
(FTIR)分析活化前后牡蛎売的超微结构、热力学变化、成分变化和红外吸收光语带。结果衰明,牡蛎壳的总钙含量
为37.56%,标准差为0.46%;SEM图显示,活化前颗粒粒径不均匀、表面光滑、孔隙少,活化后表面高度复杂,不规则
微孔和孔隙増多;TG分析表明,峰温为877.0℃时,失重率达到(43.71士0.73)%;XRD显示,活化前牡蛎売主要成分
是三方晶系方解石型CaCO,活化后主要是CaO);FTR显示,牡蛎売有明显的方解石的特征吸收峰(142lcm-
876cm~1、713cm~1):当900℃活化2h的牡蛎売用量为3g/L时,对10mg/L的刚果红溶液的脱色率为(98.13士1.39)%。
关健词牡蛎壳钙扫描电镜热重分析Ⅹ射线衍射吸附色素
中图分类号:TB321
文献标识码:A
Study on Modification of Calcium and Adsorbability of Oyster Shells
LIU Wen LI Tianhua, ZHANG Tengjun, WANG Qiujuan, CHEN Yifang SU Xiurong
(1 Faculty of Ocean, Ningbo University, Ningbo 315211; 2 Faculty of Materials Science and Chemical Engineering
Ningbo University, Ningbo 315211; 3 Ningbo Today Food Co, Ltd, Ningbo 315502
Abstract With the aim of improving the high value utilization of oyster shells, the structural characteristics
and components changes bet ween actived and unactive oyster shells were compared, the theoretical adsorbability of
oyster shells were analyzed, and preliminary studies on the their adsorption toward congo red dye were carried out. An
efficient adsorption material was prepared from oyster shells. The total calcium content of activated and unactivated
oyster shells were tested by atomic absorption spectrometry(AAS).Meanwhile, their ultrastructure, thermodynamic
changes, component changes and infrared spectral characteristics were measured using scanning electron microscopy
(SEM),thermogravimetric analyzer(TG) -ay iframe( RD) and Fourier transform infrared(FTIR) spec
troscopy respectively. The results showed that oyster shells contained 37. 56% calcium content and the standard devia
tion was 0. 46%. SEM observat ions indicated that the unactive oyster shell had a smooth surface, uneven particle
and low porosity, while the actived oyster shells had highly convoluted surfaces and a large number of irregular ores
The greatest mass loss(4371-0. 73)% was tested by TG, while the peak temperature was 8770C. XRD show
that the major components of unactivated oyster shells was trigonal calcite Caco;, while the actived Oyster shells was
nearly identical and exhibited peak characteristic of Cao. The characteristic absorption peak of calcite at 1421cm
876c 713m were seen from the FR spectrum of oyster shells. The decolorization rate of 3 /L activated oys
ter shell toward 10mg /L congo red dye solution reached(98 13-1. 39)%when the activation of 900 for h.
Key words oyster shells, calcium, SEM, TG, XRD, pigment adsorption
0引言
殖贝类,也是我国四大养殖贝类之一。目前已发现有100
多种牡蛎,全世界濒海各国几乎都有生产,中国沿海所产的
牡砺( Oyster)隶属软体动物门( Mollusca),瓣鳃纲牡蛎约20种,其总产量在贝类中居首位2。
( Lamellibranchia),异柱目( Anisomyaria),是牡蛎科( Strew
牡蛎以其味道鲜美、营养丰富而深受消费者喜爱,但食
dae)动物的总称,俗称蛎黄、海蛎子、蚝等,是世界第一大养用后的大量牡蛎壳被作为垃圾丢弃,既污染环境又造成资源
兴国家星火计划(2010GA701063);国家现代农业产业技术体系建设专项(nyey47);浙江省重中之重学科资助项目(XKO613040)
刘文:男,1986年生,硕士生,研究方向为食品工程E-mail:liuwen1221@126.com苏秀榕:通讯作者,女,1956年生,教授,博
导,研究方向为食品科学与工程及生物化学与分子生物学E-mailsuxiurong@nbu,edu.cn
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