摘要：The porous La(III)- montmorillonite hydrogel beads (La-MMT_hb) with stable structure were fabricated via hydrogen-bond and electrostatic interactions for arsenic removal from water. The structural characteristics of La-MMT_hb and its sorption performances for As(V) were evaluated. The results showed that porous La-MMT_hb were clearly observed by scanning electron microscopy, and the addition of lanthanum significantly increased the specific surface area. The maximum adsorption capacity of La-MMT_hb for As(V) was 58.75 mg/g, reached within 4 h, at the optimum pH of 4 with optimum La dosage of 1%. The mechanism of adsorption can be attributed to the electrostatic forces between La(III) and H2AsO4− at pH 4, ion exchange of Osingle bondH groups on the surface of adsorbent with H2AsO4− and complex chelate formation as.-NH3-H2AsO4 and -La-O-As.

关键词：lanthanum, Montmorillonite hydrogel beads, Porous materials,Arsenic, Adsorption