YU Benrui, YANG Fuhui, LIU Li, XING Dekun, LI Pengcheng, LI Zhanzhi, ZHU Qingxia
(Tianjin Key Laboratory of Advanced Fibers and Energy Storage, School of Material Science and Engineering, Tiangong University, Tianjin 300387, China)
Abstract: Hydroxyapatite plate ceramic membrane with high performance for wastewater treatment was prepared through phase inversion. The effects of sintering temperature and slurry solid content on morphology, sintering shrinkage, porosity, permeability and retention of the ceramic membrane were studied. When the sintering temperature is 1200 ℃ and the solid content of slurry is 44 wt.%, the porosity and sintering shrinkage of the membrane are 39.82% and 30.07%, respectively. The pore size was concentrated at 352 nm, the specific surface area was 2.23 m2·g−1 and the pore volume was 0.01 cm3·g−1. The bending strength and pure water flux can reach 11.63 MPa and 2817.23 L·m−2·h−1·bar−1, respectively. It has a stable osmotic flux of 174.86 L·m−2·h−1·bar−1 and retention rate of 96.68% for 100 mg·L−1 Congo Red dye solution. The static adsorption capacity of Congo Red dye for 1 h was 2.46 mg·g−1. The membrane fouling type was mainly cake filtration and then standard membrane pore blocking.
Key words: hydroxyapatite; phase inversion; plate ceramic membrane; membrane fouling