The health risks associated with the presence of toxic metals in water require the use of highly selective and sensitive techniques for accurately monitoring their presence and removing them to ensure public health safety. Traditional analytical methods for detecting these metals are sensitive but very expensive and may require laborious procedures, making them impractical for rapid, in situ investigations. The need for handy but cheaper and sensitive alternatives that can be used at the point of sampling therefore becomes crucial. Sensors have gained great attention as alternative methods for detecting toxic metals in the environment because they are easy-to-use and relatively inexpensive. Sensors can be modified to not only detect but also remove targeted contaminants.