摘要：In this study, activated carbon (PAC), platane wood biochars (PBC), alkali-modified biochars (m- PBC) were synthesized to produce an effective and low-cost adsorbent for remediating cadmium contamination of the environment. The characteristics of the adsorbents were mainly observed by scanning electron microscopy, automatic surface area analyzer, CHN analyzer and Fourier transform infrared spectroscopy. The effects of solution pH, contact time, adsorbent dosage, and initial concentration on the adsorption ability of m-PBC, PAC, and PBC were studied. Batch sorption experiments showed that m-PBC enhanced the removal of cadmium (Cd2+) from solution. The observed optimum pH values were 6.0-8.0, in which nearly 90% of Cd was removed; the optimal amounts of m-PBC, PAC, and PBC were 1.5, 2.0, and 2.5 g/L, respectively. The adsorption processes of m-PBC fo llowed pseudo-first-order kinetics, achieving equilibrium at around 30 min. These suggest that chemisorption is one of the possible mechanisms of Cd interaction with m-PBC. The calculated maximum Cd adsorption capacities of m-PBC, PAC, and PBC based on the Langmuir isotherm were 9.23, 8.96, and 8.49 mg/L, respectively. The results suggest that m-PBC is a promising adsorbent for the treatment of wastewater, which can in turn convert one environmental problem to a new cleaning technology.
