Dual-particles functionalized hybrid biosorbent based on a facile etching-loading method for Pb 2+ adsorption

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Herein, novel cellulose-based biosorbent with dual-particles system was fabricated through a rapid and facile etching-loading method. The results shown the adsorbent exhibited efficient and stable adsorption performance which is owing to the firm embedding of functional particles without interference on the oxidized matrix. And the maximum adsorption capacity for Pb2+ reached 372.4 mg/g. The corresponding adsorption behavior was found to accord well with the pseudo-second-order kinetic model and Langmuir isotherm model, which reveals the rate-limiting phase of adsorption process is attributed to chemical adsorption type, and Pb2+ was adsorbed onto biosorbent surface by monolayer spontaneous chemical reaction. Surface physical attraction and chemical complexation bond are dominant adsorption mechanisms. And the recycling efficiency of biosorbent reached above 83% after 5 cycles. The above results indicate the hybrid functional structure by etching-loading route provided a novel method for rapid construction of promising and recyclable adsorbent for wastewater treatment.

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