Is it permissible to divorce a righteous wife who embraced Islam and supported her husband financially and emotionally, given a difference in temperaments, the husband's feeling of emptiness and lack of love towards her, and the wife's fear of remaining alone?

Homes are built on respect and appreciation, not love alone. We advise you to hold on to your wife and save up reward with Allah, especially since she may not find someone to marry her in her country after you. You can marry a second wife if you are able, yet you would not be sinful for divorcing her.