Preparation of biochar by mango peel and its adsorption characteristics of Cd(II) in solution

摘要: Biochars were prepared by pyrolyzing mango peel waste at 300, 400, 500, 600 and 700 °C. Various characterizations carried out to explore the effect of pyrolysis temperature on biochars. The data indicated that physical chemical properties biochar such as pH, element ratio, specific surface area functional groups changed with increase temperature. yield contents hydrogen, nitrogen oxygen decreased, while ash carbon, pH biochars increased. In addition, molar ratios H/C, O/C (O + N)/C decreased. this study, batch adsorption experiments for Cd(II) performed initial concentrations 10–300 mg L−1, contact times 0–2880 min, various (2–8) dose (1–20 g L−1). Langmuir isotherm pseudo-second-order kinetics models better fits than other models, suggesting dominant is via monolayer adsorption. Biochar derived 500 °C was found have highest capacity 13.28 g−1 among all efficiency still 67.7% after desorption 4 times. Based analysis in combination EDS, FTIR XRD analysis, it concluded cation exchange, complexation precipitation minerals mechanisms responsible Cd biochar. study suggested can be recycled used a low-cost adsorbent removal from wastewater.