干旱区生态环境知识资源中心(Arid): Potential Applications in Relation to the Various Physicochemical Characteristics of Al-Hasa Oasis Clays in Saudi Arabia

Arid

DOI	10.3390/app10249016
	Potential Applications in Relation to the Various Physicochemical Characteristics of Al-Hasa Oasis Clays in Saudi Arabia
	Al-Hawas, Ibrahim A.; Hassan, Salah A.; AbdelDayem, Hany M.
通讯作者	AbdelDayem, HM (corresponding author), Ain Shams Univ, Dept Chem, Fac Sci, Cairo 11566, Egypt.
来源期刊	APPLIED SCIENCES-BASEL
EISSN	2076-3417
出版年	2020
卷号	10 期号:24
英文摘要	Featured Application Palygorskite and montmorillonite are the dominant phyllosilicate minerals in Al-Hasa oasis clays, although their coexistence is usually rare. Al-Hasa oasis clays can be used as alternative cheap materials for removal of heavy metals as they have the largest adsorption capacities toward lead (74.07 mg/g), compared with the other Saudi clays-namely, Tabuk clay (30 mg/g), Baha clay, (ca. 24 mg/g) and Khaiber clay (ca. 10 mg/g). In addition, Al-Hasa oasis clays have strong acidic properties, narrow pores and high thermal stabilities (up to 470 degrees C) and can therefore be used as catalysts in alcohol dehydration and hydrocarbon isomerization. In this work, various physicochemical characteristics, e.g., surface properties and mineralogical compositions, of five clays collected from different sites in the Al-Hasa oasis in Saudi Arabia have been investigated. Analysis of the mineralogical compositions of the clays in the study by X-ray diffraction indicated the coexistence of palygorskite, montmorillonite, illite, kaolinite, chlorite, calcite and quartz in different percentages. Thermogravimetric analysis indicated that all studied clays exhibited dehydroxylation temperatures higher than 470 degrees C. On the other hand, pore size distribution analysis of clays from N-2 adsorption indicated the presence of micro- and narrow mesopores (of 1.3-2.8 nm). Furthermore, the capability of the different clays for removal of Pb (II) from aqueous solution has been studied. The adsorption process was described through the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models. The Langmuir model was the most suitable compared to the other models in the case of palygorskite- and montmorillonite-rich clays. However, the Temkin model better represented the adsorption process of Pb (II) on calcite-rich clay. The clay sample with 61.0 wt% of palygorskite was found to be the most effective at removing Pb (II), with a maximum removal capacity of 74.07 mg/g at pH 6, with a contact time of 6 h and at 25 degrees C. Generally, the adsorption mechanism of lead over all the studied clays followed the pseudo-second-order kinetics. On the other hand, the catalytic activity of clays in the study has been tested in methanol conversion. The acidic clays, those containing high amounts of montmorillonite, showed higher selectivity to ethylene, viz., 78.9%, with a methanol conversion of 39.1% at 350 degrees C and 0.1 MPa.
英文关键词	Al-Hasa clay palygorskite montmorillonite calcite lead methanol kinetics adsorption models
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000602932000001
WOS关键词	SURFACE-CHEMISTRY ; ADSORPTION ; PALYGORSKITE ; KINETICS ; REMOVAL ; PB(II) ; LEAD ; MONTMORILLONITE ; DISSOLUTION ; TITANIUM
WOS类目	Chemistry, Multidisciplinary ; Engineering, Multidisciplinary ; Materials Science, Multidisciplinary ; Physics, Applied
WOS研究方向	Chemistry ; Engineering ; Materials Science ; Physics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348729
作者单位	[Al-Hawas, Ibrahim A.] King Faisal Univ, Dept Environm & Nat Resources, Coll Agr & Food Sci, Hofuf Al Hasa 31982, Saudi Arabia; [Hassan, Salah A.; AbdelDayem, Hany M.] Ain Shams Univ, Dept Chem, Fac Sci, Cairo 11566, Egypt
推荐引用方式 GB/T 7714	Al-Hawas, Ibrahim A.,Hassan, Salah A.,AbdelDayem, Hany M.. Potential Applications in Relation to the Various Physicochemical Characteristics of Al-Hasa Oasis Clays in Saudi Arabia[J],2020,10(24).
APA	Al-Hawas, Ibrahim A.,Hassan, Salah A.,&AbdelDayem, Hany M..(2020).Potential Applications in Relation to the Various Physicochemical Characteristics of Al-Hasa Oasis Clays in Saudi Arabia.APPLIED SCIENCES-BASEL,10(24).
MLA	Al-Hawas, Ibrahim A.,et al."Potential Applications in Relation to the Various Physicochemical Characteristics of Al-Hasa Oasis Clays in Saudi Arabia".APPLIED SCIENCES-BASEL 10.24(2020).