Self - supported Graphene Oxide/Sodium Alginate/1, 2-Propanediamine composite membrane and its Pb2+ adsorption capability

Graphene oxide (GO) composite materials as adsorbent have been widely researched in the adsorption various heavy metal contaminated water. In order to improve its structural stability and adsorption properties, self-support GO/Sodium Alginate (SA)/1, 2-Propanediamine (PDA) composite membrane was prepared by vacuum filtration. The performance of amino functional groups in composite membranes was observed using X-ray photoelectron spectrum (XPS). The X-ray diffraction (XRD) was used to characterize the interlayer spacing. The Pb2+ adsorption properties of composite membranes were discussed by intermittent adsorption experiments. Intermittent adsorption experiments include the subject of the pH, contact time, adsorption film weight, concentration of metal ion and temperature change. The Pb2+ adsorption on the composite membrane strongly depends on pH. After 20 min of adsorption, the membrane reached the adsorption equilibrium, and the adsorption rate was fast. The maximum adsorption capacity of the composite membrane to Pb2+ was 189.25 mg g−1. The adsorption process of the membrane was consistent with the chemisorption process and mono-layer adsorption process. The GO/SA/PDA membranes can be used to the adsorption of Pb2+, which might give contribution to environmental protection.