loop to return a string in a column if the values of another column are between such and such value

Question

I have a simple loop that does not work, I want my loop to return a string in a column if the values of another column are between such and such value

df['column_text'] = 'None'

for x in df['values_column']:
    if (0 < x < 9):
        df['column_text'].append('0-9')
    elif (10 < x < 19):
        df['column_text'].append('10-19')
    elif (20 < x < 49):
        df['column_text'].append('20-49')
    elif (50 < x < 99):
         df['column_text'].append('50-99')
    elif (100 < x < 249):
         df['column_text'].append('100-249')
    elif (250 < x < 499):
         df['column_text'].append('500-1999')
    else:
         df['column_text'].append('None')

The loop return this error btw : TypeError: cannot concatenate object of type '<class 'str'>'; only Series and DataFrame objs are valid

Thx for any help!