Adsorption performance and mechanism of methylene blue by H3PO4- modified corn stalks. Issue 6 (December 2019)

• Record Type: Journal Article
• Authors: Tang, Yufang; Zhao, Yuemei; Lin, Tianpei; Li, Yuqin; Zhou, Rong; Peng, Yongzhen
• Is Part Of: Journal of environmental chemical engineering. Volume 7:Issue 6(2019)
• Publication Date: 2019-12
• Subjects: Adsorption -- Methylene blue -- H3PO4-modified corn stalks (P-CSs) -- Mechanism; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2019.103398
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: P-CSs was preparation through H3 PO4 modifying CSs. 2.The qe of MB on regenerated P-CSs maintained 91% level on native P-CSs after 4 adsorption-desorption cycles. Electrostatic attraction, ion exchange are involved in adsorption of MB on P-CSs. Abstract: A novel bio-adsorbent based on H3 PO4 -modified corn stalks (P-CSs) was synthesized and used to adsorb methylene blue (MB) from aqueous solution. The successful modification of corn stalks by H3 PO4 was verified by using XPS, FT-IR, respectively. Meanwhile, the adsorption performance and the adsorption mechanism of P-CSs were investigated. This novel bio-adsorbent performed stably over a considerably wide pH range of 6.0∼9.0. And electrostatic attraction and ion exchange were involved in adsorption of MB on P-CSs. Furthermore, the adsorption of MB by P-CSs perfectly fitted the Langmuir isotherm model ( R 2 = 0.997–0.999) and pseudo second order kinetic model ( R 2 = 0.999). The qe of MB on P-CSs was 129 mg/g at 308 K by Langmuir model, and thermodynamic study showed that MB adsorption is a spontaneous exothermic process. The regeneration and re-adsorption experiments indicated P-CSs's merit of regeneration with the recovery efficient of 91% after 4 adsorption-desorption cycles. This novel bio-adsorbent prepared in this work could achieve effective removal of MB and could be reused for 4 and more adsorption-desorption cycles for MB removal.