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Xuejiang Wang,Jie Chen,Xiangbo Yan,Xin Wang,Jing Zhang,Jiayu Huang,Jian-FuZhao 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Citric acid chemical extraction technology in combination with ultrasonication was used to removeheavy metals from industrial and municipal mixed sludge. The removal efficiencies of Zn, Ni, Cr and Cureached 53.5%, 40.2%, 35.4% and 13.1%, respectively, at citric acid concentration of 0.2 M assisted byultrasound for 20 min. The extracted Zn, Ni and Cr mainly came from acid-soluble, reducible andoxidizable fractions, and Cu mainly came from oxidizable and reducible fractions. The presence of Fe3+,Al3+ and Ca2+ improved the extraction efficiency of Cu from the sludge significantly. The extracted sludgecould be used for soil amendment.
Adsorption of Pb(II) from aqueous solution to Ni-doped bamboo charcoal
Yin Wang,Xuejiang Wang,Xin Wang,Mian Liu,Zhen Wu,Lianzhen Yang,Siqing Xia,Jianfu Zhao 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Bamboo charcoal (BC) obtained by pyrolysis of Makino bamboo in the absence of oxygen was used as support for the preparation of Ni-doped adsorbent (Ni-BC). The low-cost composite was characterized and used as an adsorbent for Pb(II) removal from water. The results showed that both BET surface area and total pore volume of Ni-BC increased. The adsorption of Pb(II) strongly depended on solution pH,temperature and ionic strength. The adsorption isotherms followed Langmuir isotherm model well, and the maximum adsorption capacities of Pb(II) at 298 K were 25.0 and 142.7 mg/g for BC and Ni-BC,respectively. The adsorption processes were well fitted by pseudo-second-order kinetic model. Thermodynamic parameters showed that the adsorptions of Pb(II) onto both adsorbents were feasible,spontaneous, and exothermic under the studied conditions. The spent Ni-BC could be readily regenerated for reuse.