Mechanisms and factors affecting the adsorption of sodium alginate onto modified clays

doi:10.1007/s00343-013-2226-8

	Mechanisms and factors affecting the adsorption of sodium alginate onto modified clays
	Lin Yongxin 1,2; Cao Xihua1 ; Song Xiuxian1 ; Wang Nan1,2 ; Yu Zhiming1 ; Cao, XH
	2013-07-01
发表期刊	CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	0254-4059
卷号	31 期号:4 页码:867-875
文章类型	Article
摘要	Algal organic materials (AOMs) are one critical factor affecting the efficiency of modified clays used for the mitigation of harmful algal blooms (HABs). This study was conducted to develop a deeper understanding of the mechanisms and factors affecting the adsorption of AOMs onto modified clays. Sodium alginate (polysaccharide) and kaolinite modified with polyaluminium chloride (PACl) were used as AOMs and modified clay model substances, respectively, and the effects of modifier dosage, contact time, solution pH and ionic strength were investigated through batch adsorption experiments. Kinetics revealed that the alginate adsorption rate was described well by a pseudo-second order model. PACl effectively enhanced the adsorption capacity of kaolinite and increased the adsorption rate, and the optimum additive amount of PACl was 5%. The experimental data fitted both the Freundlich and Langmuir adsorption equations well. The adsorption thermodynamics for alginate onto modified clays suggests that alginate adsorption is a spontaneous process. The adsorption of alginate onto modified clays was highly dependent on pH, with a decrease in adsorption observed with increased pH to 9.48, but the opposite was true above pH 9.48. Finally, adsorption increased with increasing ionic strength.; Algal organic materials (AOMs) are one critical factor affecting the efficiency of modified clays used for the mitigation of harmful algal blooms (HABs). This study was conducted to develop a deeper understanding of the mechanisms and factors affecting the adsorption of AOMs onto modified clays. Sodium alginate (polysaccharide) and kaolinite modified with polyaluminium chloride (PACl) were used as AOMs and modified clay model substances, respectively, and the effects of modifier dosage, contact time, solution pH and ionic strength were investigated through batch adsorption experiments. Kinetics revealed that the alginate adsorption rate was described well by a pseudo-second order model. PACl effectively enhanced the adsorption capacity of kaolinite and increased the adsorption rate, and the optimum additive amount of PACl was 5%. The experimental data fitted both the Freundlich and Langmuir adsorption equations well. The adsorption thermodynamics for alginate onto modified clays suggests that alginate adsorption is a spontaneous process. The adsorption of alginate onto modified clays was highly dependent on pH, with a decrease in adsorption observed with increased pH to 9.48, but the opposite was true above pH 9.48. Finally, adsorption increased with increasing ionic strength.
关键词	Modified Clays Sodium Alginate Adsorption Kinetics Adsorption Isotherms Ph Ionic Strength
学科领域	Marine & Freshwater Biology ; Oceanography
DOI	10.1007/s00343-013-2226-8
URL	查看原文
收录类别	SCI
语种	英语
WOS研究方向	Marine & Freshwater Biology ; Oceanography
WOS类目	Limnology ; Oceanography
WOS记录号	WOS:000321629400019
WOS关键词	NATURAL ORGANIC-MATTER ; POLYALUMINUM CHLORIDES ; ELECTROSTATIC PATCH ; ACTIVATED ALUMINA ; AQUEOUS-SOLUTION ; AQUATIC SYSTEMS ; EXOPOLYMERS EPS ; COAGULATION ; KAOLINITE ; KINETICS
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/16481
专题	海洋生态与环境科学重点实验室
通讯作者	Cao, XH
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Lin Yongxin,Cao Xihua,Song Xiuxian,et al. Mechanisms and factors affecting the adsorption of sodium alginate onto modified clays[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2013,31(4):867-875.
APA	Lin Yongxin,Cao Xihua,Song Xiuxian,Wang Nan,Yu Zhiming,&Cao, XH.(2013).Mechanisms and factors affecting the adsorption of sodium alginate onto modified clays.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,31(4),867-875.
MLA	Lin Yongxin,et al."Mechanisms and factors affecting the adsorption of sodium alginate onto modified clays".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 31.4(2013):867-875.

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