Table 2. Adsorption conditions

Optimal conditions	Variable	Quantitative
Time (h)	0.5, 1, 2, 3, 4	pH=3, carbon to liquid ratio=1:5
pH	1, 2, 3, 4, 5	Carbon to liquid ratio=1:10, 3 h
Carbon to liquid ratio	1:3, 1:4, 1:5, 1:6, 1:7	pH=3, 3 h