If we arrived PVR-T1 at 1445, possible we could catch the last G-Train to Beijing at the same day?

Do you mean Pudong airport? If you hurry on the way, it is still possible for the 19:00 ride. If you take the taxi, it would be about 1 hour to 90min. So you may able to arrive at Hongqiao railway station around 17:30. There are still enough time for the ticket collection.