Fig. 6From: The Enhanced Catalytic Activities of Asymmetric Au-Ni Nanoparticle Decorated Halloysite-Based Nanocomposite for the Degradation of Organic Dyes a Plots of ln(C t /C 0 ) against time for the reduction of Congo red and 4-nitrophenol with HNTs@Fe3O4@Au-Ni nanocatalyst. b Conversion of the above dyes in 10 successive cycles of reduction and magnetic separation with HNTs@Fe3O4@Au-Ni nanocatalystBack to article page