The rapid development of nuclear energy in China has led to an increase in attention to the treatment of low-level radioactive wastewaters (LLRWs). One of the important contaminants is radioactive Cs. The removal of trace amounts of Cs-134 and Cs-137 can be achieved by means of a selective adsorption process. One of the possibilities is the application of potassium titanium hexacyanoferrate. In this paper, a novel magnetic potassium titanium hexacyanoferrate (M-PTH) material was prepared. The batch experiments demonstrate a selective adsorption of Cs over a wide pH range from 1 to 10. The co-existing nonradioactive ions can affect the adsorption of Cs. By increasing the Na+ and K+ concentration from 0.001 to 0.1 M, the distribution coefficient (K-d) of Cs drops slowly within the ranges of 7.28 x 10(4) to 1.10 x 10(4) mL/g and 1.25 x 10(5) to 1.49 x 10(4) mL/g, respectively. The adsorption isotherm coincides well with the Langmuir model. The thermodynamic study reveals an endothermic and spontaneous process. The kinetic performance follows the pseudo-second-order adsorption model, with intra-particle diffusion as the rate-controlling step. Based on the characteristics of M-PTH, a sequencing batch reactor (SBR) was considered to be suitable for the treatment of LLRWs containing radioactive Cs. Up to a total throughput of 70 batches, the decontamination factor (DF) can be kept at 1000. The volume ratio of treated solution and exhausted adsorbent was almost 7000. (C) 2015 Elsevier B.V. All rights reserved.