How did Diamond Jozu lose his arm? I have read in the wiki that Jozu's right arm was missing after the war. But I have never seen nor notice it in the anime.

And I can't find the part where he lost it.

So when and how did he lose his arm and who was he fighting with??
Here is a video from the MarineFord War which shows that he lost his arm to Aokiji.
While fighting Aokiji, his attention goes towards Marco and Aokiji takes advantage of this and uses his devil fruit power to make him freeze.