In this section, you can access to the latest technical information related to the FUTURE project topic.

Removal of heavy metal(loid)s from aqueous solution by biogenic FeS?kaolin composite: Behaviors and mechanisms

In this work, a green adsorbent, biogenic FeS?kaolin composite (KL?FeS) was synthesized by sulfate?reducing bacteria (SRB) mediation, and its potential for Cd(II), Pb(II), Cu(II), Zn(II), As(III) and Sb(III) removal was evaluated. Among prepared composites, the KL?FeS synthesized at a concentration of 2?g/L kaolin performed a better removal efficiency on heavy metal(loid)s and the adsorption results followed the pseudo?second?order and Redlich?Peterson models, indicating that the adsorption was a hybrid chemical reaction?adsorption process. Additionally, the maximum adsorption capacities of Cd(II), Pb(II), Cu(II), Zn(II), As(III) and Sb(III) on KL?FeS in monocomponent system were 71.71, 133.54, 51.90, 54.41, 38.71 and 96.38?mg/g, respectively (pH?=?5.0???0.1, T?=?25??C). In addition, the increase of pH and ionic strength promoted the adsorption capacities of KL?FeS for metal-(loid)s. Moreover, FTIR, XPS and XRD analyses supported that surface complexation, hydrogen bonding, ion exchange, electrostatic interaction and chemical precipitation were predominately mechanisms involved in the adsorption process. Furthermore, KL?FeS displayed higher affinity for Pb(II), Sb(III) and Cu(II) in the multi?component system. This work highlighted the potential of biogenic FeS?kaolin composite for simultaneous removal of multiple heavy metal(loid)s under aerobic conditions.

» Author: Rui Xu, Qian Li, Yongbin Yang, Shengming Jin, Lang Liao, Zhenguo Wu, Zhe Yin, Bin Xu, Xiaolong Nan, Youyu He, Bing Zhu, Tao Jiang

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