None used to replace uncountable nouns should always be singular. None used in place of countable nouns may be either singular or plural, unless the rest of the circumstances or phrasing require it to be one or the other.
You only use none of or none to talk about a group of three or more things or people. If you want to talk about two things or people, you use neither of or neither.
Since none has the meanings "not one'' and "not any,'' some insist that it always be treated as a singular and be followed by a singular verb: The rescue party searched for survivors, but none was found. However, none has been used with both singular and plural verbs since the 9th century.
There are two meanings listed in OED's entry for the noun none, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.
The words non and none are often confused because they are easy to mistype. In this article, we explain the difference between them. Non means not when used as a prefix. None means zero, nothing when used as a noun. A good way to remember the difference is Non is only one letter different from Not.
None used to replace uncountable nouns should always be singular. None used in place of countable nouns may be either singular or plural, unless the rest of the circumstances or phrasing require it to be one or the other.