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The atrazine degradation curves in different systems are compared and demonstrated in Fig.1(a).It was found that almost no atrazine degradation was shown in Fe3O4/HA system.Only 10%atrazine was degraded in Fe3O4/PMS system,suggesting the slight catalytic effect of Fe3O4 for peroxymonosulfate due to the poor surface Fe(Ⅲ)/Fe(Ⅱ)cycle of Fe3O4.