In this paper, the effects of PPESK concentration, and additives of PEO-PPO-PEO, oxalic acid/PEO-PPO-PEO, nano-TiO2/oxalic acid/PEO-PPO-PEO on membrane performances and arsenic adsorption properties were investigated. Compared with single additive of PEO-PPO-PEO, oxalic acid/PEO-PPO-PEO or nano-TiO2/oxalic acid/PEO-PPO-PEO had better pore-forming ability. It was found that PPESK membranes with additives of PEO-PPO-PEO or oxalic acid/PEO-PPO-PEO had no arsenic adsorption capability. For optimized PPESK membrane (14.0 wt.% PPESK/1.2 wt.% nano-TiO2/3.0 wt.% oxalic acid/3.0 wt.% PEO-PPO-PEO), with the contact time increasing, the arsenic adsorption efficiency decreased from 100 to 73.7%; with the increase of operation pressure, the efficiency of arsenic adsorption led a light decrease which ranged from 86.6 to 70.8%; when the arsenic (V) concentration increased from 0 ppb to 500 ppb, the arsenic adsorption efficiency reduced from 100 to 8.3%; the effect of feed temperature on arsenic adsorption was indistinctively; as the pH increasing from 3 to 11, the efficiency of arsenic adsorption first kept stable at 85.0%, and then decreased to 63.4%. (C) 2015 Elsevier B.V. All rights reserved.