Surface Modification of Natural Mordenite and Its Application in Removal of Heavy Metals from Aqueous Solution

Zhe WANG; Ke-yan TAN; Ming-hui LIANG; Jing-yi CAI; Shi-tian HOU; Yue WANG; Peng JIANG

doi:10.15898/j.cnki.11-2131/td.201802110018

2018 Vol. 37, No. 6

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Article navigation > Rock and Mineral Analysis > 2018 > 37(6): 678-686

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Zhe WANG, Ke-yan TAN, Ming-hui LIANG, Jing-yi CAI, Shi-tian HOU, Yue WANG, Peng JIANG. Surface Modification of Natural Mordenite and Its Application in Removal of Heavy Metals from Aqueous Solution[J]. Rock and Mineral Analysis, 2018, 37(6): 678-686. doi: 10.15898/j.cnki.11-2131/td.201802110018

Citation:

Zhe WANG, Ke-yan TAN, Ming-hui LIANG, Jing-yi CAI, Shi-tian HOU, Yue WANG, Peng JIANG. Surface Modification of Natural Mordenite and Its Application in Removal of Heavy Metals from Aqueous Solution[J]. Rock and Mineral Analysis, 2018, 37(6): 678-686. doi: 10.15898/j.cnki.11-2131/td.201802110018

Surface Modification of Natural Mordenite and Its Application in Removal of Heavy Metals from Aqueous Solution

1.
College of Civil Engineering, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Eco-Geochemistry, Ministry of Natural Resources; National Research Center for Geoanalysis, Beijing 100037, China
3.
National Center for Nanoscience and Technology, Beijing 100190, China

More Information

Corresponding author: Ke-yan TAN, tankeyan2017@163.com

Received Date: 11 February 2018

Revised Date: 10 April 2018

Accepted Date: 07 May 2018

Abstract

Abstract

BACKGROUNDNatural mordenite is widely used as a green and cheap porous material to remove heavy metals in environmental treatment. Currently, the removal rate of heavy metals by natural zeolites is from 60% to 90%, and improving its removal efficiency has been a hot topic. OBJECTIVESTo reconstruct and modify natural mordenite by tetraethyl orthosilicate, and determine its effect on the removal of heavy metals in water. METHODSThe morphology and structure of the modified mordenites were characterized by TEM, XRD and BET. RESULTSThe SiO₂ hydrolyzed by tetraethyl orthosilicate can be combined with natural mordenite to form a new 'SiO₂/mordenite'. The surface of the original mordenite is coated with the pore structure of the new nano-SiO₂ without damaging the porous structure of the original mordenite. The modified mordenite combines the advantages of natural mordenite and nano-SiO₂ pore structure, enhancing the adsorption of heavy metal ions. The highest adsorption rate of modified mordenite for Pb²⁺, Cd²⁺, Zn²⁺, and Mn²⁺ was 99.3%, 97.1%, 98.3%, and 97.0%, respectively. The modified mordenites were minimally desorbed during the entire process and have stable performance. Considering the cost and the appropriate adsorption rate, the best dosage of adsorption efficiency is selected. The optimal dosage of Pb²⁺, Cd²⁺, Zn²⁺ and Mn²⁺ solutions for the initial concentration of 10 mg/L is 0.5, 2, 2 and 5 g/L, respectively. It can provide a reference for a pilot experiment and scale applications. CONCLUSIONSCompared with roasting, acid, alkali, salt and organic modification, this modification method has a high adsorption rate for a variety of heavy metals, and shows the advantages of simple operation, low cost and environmental friendliness, making it a good application prospect.
- natural mordenites /
- silica /
- surface modification /
- heavy metals /
- adsorption

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