LM741CN Wired as Voltage Follower Will not Output less than 2V
The 741 is not a rail to rail amplifier.

The thing on the spec sheet you want is the  minimum output voltage specification, which depending on things like rail voltage and load will always be a few volts above the negative supply rail. 

In your case, the negative rail is at 0v, so the minimum output voltage you can expect is 2(ish) volts if it doesn't have to sink a current, and 3(ish) if it does.

Use a 'single supply amplifier' like the LM324 if you want your inputs and outputs to include ground, or a 'rail to rail' (R2R) amplifier if you want to swing all the way to both rails.

In all cases, 741 is never the right amplifier to use these days.