Facile Preparation of Water-processable Biochar Based on Pitch Pine and Its Electrochemical Application for Cadmium Ion Sensing

摘要

The water-processable biochar (BC) based on pitch pine was prepared by dispersing these grindedmicropowders into carboxymethyl cellulose (CMC) mixed aqueous dispersion for electrochemical2+ sensing of cadmium ion (Cd ) in real samples. Biochars was obtained by pyrolyzing the pitch pineunder oxygen-limited conditions at 600 C. Montmorillonite (MMT) was employed for enhancingsurface area, adsorption capacity, ion-exchange ability and dispersive stability. Carboxymethylcellulose was selected for enhancing water-dispersive ability, film-forming ability, adhesive ability.BC-CMC-MMT composites displayed synergistically enhanced ability like surface area, adsorption2+ capacity and stripping response towards Cd , which was employed as cost-effective electrode2+ -8 -5 modified material for voltammetric determination of Cd in linear range of 2.0 10 8 10 Mwith limit of detection of 6.7 nM, remarkable selectivity, and good practicability. Satisfactory sensingperformance indicated that low-cost water-processable BC has practical values and serves as sensingmaterial for electrochemically determining heavy metal ions in real samples.