Dyes Adsorption onto Fe3O4-Bis(trimethoxysilylpropyl)amine Composite Particles: Effects of pH and Ionic Strength on Electrostatic Interactions

Yaoqiang Hu, Kexin Li, Yuting Li, Haining Liu, Min Guo, Xiushen Ye, Zhijian Wu, Kangtaek Lee

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Hydrophobic, electrostatic interactions, and hydrogen bonding play important roles in dyes adsorption. Solution pH and ionic strength of aqueous solutions are important factors affecting dye adsorption by influencing the aforementioned interactions. In order to understand adsorption mechanism of dye on the mesoporous particles, Fe3O4-bis(trimethoxysilylpropyl)amine (Fe3O4-TSPA) composite particles were used to adsorb methyl orange (MO), methyl blue (MB), and neutral red (NR) from aqueous solutions. Fe3O4-TSPA particles were found to be effective in removing acidic dyes at pH < 8.5. The adsorption amount of MB was nearly 0.047 mmol/g at pH 2. The adsorptions of MO and MB were found to be significantly influenced by electrostatic interactions. Based on the effect of NaCl on the adsorption, it was concluded that the electrostatic attraction was suppressed by high ionic strength, but suppression was less significant when electrostatic attraction was strong.

Original languageEnglish
Pages (from-to)617-622
Number of pages6
Issue number2
Publication statusPublished - 2019 Jan 17

Bibliographical note

Funding Information:
This work was financially supported by the foundation of Natural Science Foundation of China (Project No. U1507104, U1607102, U1607111), Basic Research Program of Qinghai Province (2018-ZJ-706), State Scholarship Fund by CSC and CAS “Light of West China” Program, The Thousand Talents Plan of Qinghai province.

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

  • Chemistry(all)


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