高岭土铝活化法制备改性粘土及其除藻机制

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Abstract This study analyzed modified clay (MC) prepared from calcined kaolin using a new method for activation of aluminum, which includes acid pickling, base neutralizing, supplementation of uncalcined kaolin clay, and aging. The algae removal efficiency (ARE) of MC was evaluated as a way to optimize various treatment conditions of the new method. Results showed that the acid pickling-base neutralization step had a significant impact on the ARE (P<0.05), achieving 90% of ARE when pH of the treated slurry calibrated to no more than 3.6 by base neutralization. Analysis of physicochemical properties of the MC and the examination of floc revealed that MC prepared with the optimized conditions had a compact curled sheet structure and a rough micro-surface, which exuded a large amount of activated aluminum from the mineral crystals, with higher contents of both the monomer aluminum (Al_a) and the polyhydroxy aluminum (Al_b) when MC was dispersed in seawater, suggesting that the activated aluminum was easily transformed into Al_a and Al_b. Meanwhile, the zeta potential of the suspended MC particles changed from negativity to positivity. As a consequence, the activated aluminum and the improved clay surface thus ensured that the MC has a higher capability to eliminate red tide algae.

Key words： red tide control modified clay aluminum activation acid pickling-base neutralization algal removal efficiency

Received: 02 April 2022

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X55

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	Articles by authors
	WANG Ming-jiao
	CAO Xi-hua
	JIANG Kai-qin
	JIANG Wen-bin
	SONG Xiu-xian
	YU Zhi-ming

Cite this article:

WANG Ming-jiao,CAO Xi-hua,JIANG Kai-qin等. Modified clay preparation via kaolin aluminum activation and its algae removal mechanism[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5387-5394.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5387

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