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Efficient Adsorption of Anionic Azo Dye in Wastewater with Medulla tetrapanacis Modified by Cationic Surfactant

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Abstract

In this study, Medulla tetrapanacis (MT), a kind of herbaceous plant, was modified by phosphoric acid (H3PO4) and cetyltrimethylammonium bromide (CTAB) to obtain the adsorbent MT-H3PO4-CTAB. It could quickly and efficiently remove the anionic azo dyes, Congo Red (CR) and Ponceau S (Po.S), from solution. For 500 mg/L CR and 150 mg/L Po.S dye solution, the removal efficiency could reach 84.52% and 95.29% within 10 min, and the maximum adsorption capacities of MT-H3PO4-CTAB towards CR and Po.S were 719.42 mg/g and 230.94 mg/g at 303 K, respectively. The effects of initial pH of the solution, temperature, initial dye concentration, and contact time were optimized. The adsorption process followed the pseudo-second-order kinetic model, and the equilibrium adsorption data fitted the Langmuir isotherm well. Moreover, thermodynamic studies indicated that the adsorption of two anionic azo dyes was spontaneous. The adsorption of CR onto MT-H3PO4-CTAB was endothermic while the adsorption of Po.S was exothermic. Molecular interactions, such as electrostatic attraction and hydrogen bonding between dyes molecules and adsorbent, play an important role in the adsorption process. This study demonstrates that acid-activated and surfactant-modified herbaceous plant adsorbent has a simple preparation process and exhibits excellent adsorption properties for anionic azo dyes, which could extend the potential applicability for biomass.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

National Natural Science Foundation of China (21374029, 21776076), Open Research Fund of Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University and Open Research Fund of International Joint Laboratory on Resource Chemistry, Shanghai Normal University.

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Lianpeng Yan carried out the concepts, design, definition of intellectual content, literature search, data acquisition, data analysis and manuscript preparation. Keming Zhou provided assistance for data acquisition, data analysis and statistical. Rui Zhang and Xuedong Zhu performed manuscript review and editing. All authors read and approved the final manuscript.

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Correspondence to Rui Zhang or Xuedong Zhu.

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Yan, L., Zhou, K., Zhang, R. et al. Efficient Adsorption of Anionic Azo Dye in Wastewater with Medulla tetrapanacis Modified by Cationic Surfactant. Water Air Soil Pollut 234, 511 (2023). https://doi.org/10.1007/s11270-023-06464-9

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  • DOI: https://doi.org/10.1007/s11270-023-06464-9

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