丝瓜络固定颤藻吸附Pb<sup>2+</sup>的动力学及机理

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Abstract Freeze-drying-inactivated Oscillatoria lutea Immobilized (FI) and Hot-air-inactivated Oscillatoria lutea Immobilized (HI) were used as adsorbents for Pb²⁺ adsorption from the solution with Freeze-drying-inactivated Oscillatoria lutea Free (FF) and Hot-air-inactivated Oscillatoria lutea Free (HF) as control samples. The effects of pH, contact time, Pb²⁺ initial concentrations and co-existing ions on adsorption capacity and the adsorption mechanism were investigated. Results showed that FI presented the best adsorption performance, which was better than HI and control samples. The pH, contact time, initial Pb²⁺ concentrations and coexisting ions influenced adsorption capacity of Pb²⁺ with the consistent trends with FI, HI and control samples. The adsorption capacities with FI and HI depended on pH, reaching the highest value at pH=5; With the initial Pb²⁺ concentrations increased, the adsorption capacity increased, and the equilibrium adsorption capacities were 80and 60mg/L, respectively; the adsorption capacities got equilibrium after 90 and 60 min contact time, respectively; and the coexisting ions were found to inhibited the adsorption of Pb²⁺ and the order of inhibition was: Ca²⁺>Mg²⁺>K⁺>Na⁺. The adsorption of Pb²⁺ by the four adsorbents followed the pseudo-second- order kinetic equation, and the adsorption process was mainly affected by the chemical adsorption rate. The experimental results revealed that the adsorption isotherm process of FF and FI was in accordance with Langmuir and Freundlich model, the Pb²⁺ adsorption process by HI followed the Langmuir model, and HF fitted the Freundlich model. The Fourier transform infrared spectroscopy measurement suggested that the main functional groups in the Pb²⁺ adsorption process with FI were amino- and carboxyl- groups. Further, the mechanisms of adsorption process involve the ion exchange, electrostatic attraction, and complexation. The cyclic adsorption results established the high potential of FI as a robust and promising adsorbent for industrial treatment of Pb²⁺.

Key words： loofah immobilization Oscillatoria lutea adsorption Pb²⁺

Received: 14 May 2021

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X522

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	Articles by authors
	DU En-ju
	LI Yang
	FENG Wei
	WANG Xue-qing
	SHI Yu
	YIN Zi-han
	TONG Yao
	CHEN Bi-qiang
	HUANG Zi-han

Cite this article:

DU En-ju,LI Yang,FENG Wei等. Kinetics and mechanism of adsorption Pb²⁺ by immobilized Oscillatoria lutea with loofah[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5701-5709.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I12/5701

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