Modified clay preparation via kaolin aluminum activation and its algae removal mechanism
WANG Ming-jiao1,2,3, CAO Xi-hua1,2,3, JIANG Kai-qin1,2,3, JIANG Wen-bin1,2, SONG Xiu-xian1,2,3, YU Zhi-ming1,2,3
1. Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; 2. Functional Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China
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 (Ala) and the polyhydroxy aluminum (Alb) when MC was dispersed in seawater, suggesting that the activated aluminum was easily transformed into Ala and Alb. 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.
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