“…We also summarized the Pb 2+ detection or adsorption performance achieved by some other materials reported recently, and compared their sensitivity, selectivity, and adsorption performance (Table 2). 6,7,9,10,12,18,35,44,46,60,62 Although few materials or devices show higher detection or adsorption capacities toward Pb 2+ than our developed PNBC hydrogel, they cannot simultaneously colorimetrically detect and remove Pb 2+ in water. This hampers their wide applications to some extent.…”