Facile Fabrication of a Low-Cost Alginate-Polyacrylamide Composite Aerogel for the Highly Efficient Removal of Lead Ions
In this study, we demonstrate a one-step method for fabricating a novel sodium alginate-polyacrylamide (Alg&ndash;PAM) composite aerogel, which exhibits a very high affinity and selectivity towards Pb2+. The as-prepared Alg&ndash;PAM composite aerogel can uptake 99.2% of Pb2+ from Pb2+-containing aqueous solution (0.1 mM) and the maximum adsorption capacity for Pb2+ reaches 252.2 mg/g, which is higher than most of the reported Pb2+ adsorbents. Most importantly, the prepared Alg&ndash;PAM adsorbent can be regenerated through a simple acid-washing process with only a little loss of the adsorption performance after five adsorption&ndash;desorption cycles. In addition, the influence of the experimental conditions, such as the solution pH, contact time, and temperature, on the adsorption performance of the Alg&ndash;PAM adsorbent was studied. It is clear that the low-cost raw materials, simple synthesis, regeneration ability, and highly efficient removal performance mean that the designed Alg&ndash;PAM aerogel has broad application potential in treating Pb2+-containing wastewater.