Fig. 3From: Preparation of Hollow Polyaniline Micro/Nanospheres and Their Removal Capacity of Cr (VI) from WastewaterThe Cr (VI) solution after treated with hollow PANI micro/nanospheres in different times, solution pH respectively at a 3, b 4, and c 5 (initial Cr (VI) concentration: 1.2 mmol/L (62.4 mg/L)). a The photographs and b Cr (VI) concentration in the final solutionBack to article page