Adsorption performance of polydopamine-modified attapulgite granular adsorbent for methylene blue | Zendy

Weisheng Zheng | Zendy; Hailing Wang | Zendy; Zhaolian Zhu | Zendy; Peng Wei | Zendy

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Adsorption performance of polydopamine-modified attapulgite granular adsorbent for methylene blue

Author(s) -

Weisheng Zheng,

Hailing Wang,

Zhaolian Zhu,

Peng Wei

Publication year - 2017

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2017.482

Subject(s) - adsorption , physisorption , methylene blue , endothermic process , langmuir adsorption model , fourier transform infrared spectroscopy , aqueous solution , chemical engineering , chemistry , nuclear chemistry , x ray photoelectron spectroscopy , desorption , scanning electron microscope , materials science , chromatography , organic chemistry , composite material , catalysis , photocatalysis , engineering

Polydopamine-modified granule organo-attapulgite adsorbent (PDA-GOAT) was facilely prepared via a dip-coating approach. The samples were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Surface area and pore size were calculated from the Brunauer-Emmett-Teller method by N 2 adsorption-desorption isotherm. The adsorption behaviour of methylene blue (MB) onto PDA-GOAT was systematically investigated. The experimental data revealed that the adsorption process fitted well with the pseudo-second-order kinetics equation and the adsorption isotherm fitted better with the Langmuir model. Thermodynamic analyses illustrated that MB adsorption onto PDA-GOAT was a physisorption endothermic process. Importantly, PDA-GOAT can be regenerated by NaBH 4 aqueous solution. The obtained results prove that PDA-GOAT can be a superior reusable adsorbent for the removal of MB from effluent.

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