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Zhuhong Ding,Zhuhong Ding,Yongshan Wan,Shengsen Wang,Bin Gao 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
Engineered biochar was obtained through slow pyrolysis of hickory wood and then further modifiedwith NaOH. After modification, biochar’s surface area, cation-exchange capacity, and thermal stabilitywere significantly improved. The modified biochar exhibited much larger (2.6–5.8 times) metaladsorption capacities than the pristine biochar. Competitive batch adsorption of mixed metal ions (Pb2+,Cd2+, Cu2+, Zn2+, and Ni2+) showed preferential adsorption of Pb2+ and Cu2+ onto the modified biochar. The alkali-modified biochar in a fixed-bed column also showed strong ability to filter heavy metals fromaqueous solutions. The alkali-modified biochar thus can serve as alternative absorbent for heavy metals
Zhuhong Ding,Bin Gao,Yongshang Wan,Xinhua Zhu,Shengsen Wang,Andrew R. Zimmerman 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
Hickory biochars were obtained through slow pyrolysis under 350 8C, 450 8C, and 600 8C. Multiplecharacterization techniques were used to characterize the biochars and showed pyrolysis temperatureaffected their O/C ratios, surface areas, cation-exchange capacities, zeta potential, surface acidic groups. As the result, the biochars showed different adsorption ability to Pb(II) and methylene blue in aqueoussolutions, which was due to the important roles of the physicochemical properties of the biochars incontrolling the sorption processes. This work provided a comprehensive evaluation of biochars, and thusexpanded on previous research on effects of pyrolysis temperature on biochar properties.