Effect of deashing on activation process and lead adsorption capacities of sludge-based biochar
Effect of deashing on activation process and lead adsorption capacities of sludge-based biochar
复制标题
清灰对污泥基生物炭活化过程及铅吸附能力的影响
DOI：
10.1016/j.scitotenv.2020.137016
复制
发表时间：
2020
影响因子：
9.8
通讯作者：
Chen Hanping
中科院分区：
文献类型：
--
作者：
Zhang Junjie;Shao Jingai;Jin Qianzheng;Zhang Xiong;Yang Haiping;Chen Yingquan;Zhang Shihong;Chen Hanping
为探讨无机矿物对污泥基生物炭活化过程及铅吸附的影响，采用盐酸或氢氟酸对污泥基生物炭进行预脱水，然后进行醋酸钾活化。结果表明，盐酸或氢氟酸脱灰可以改善污泥基生物炭的孔隙参数，促进乙酸钾的后续活化效果。经盐酸和氢氟酸预处理后，醋酸钾活化的生物炭比表面积分别由583.36 m2/g增加到718.70 m2/g和991.55 m2/g。孔隙结构的增强有利于增强污泥基生物炭对铅的物理吸附，同时对化学吸附没有明显影响。因此，氢氟酸预处理的生物炭和活性生物炭的铅吸附能力分别为16.70和49.47 mg/g，高于未处理的生物炭（7.56和38.49 mg/g）。
To explore the effect of inorganic minerals on activation process and lead adsorption of sludge-based biochar, sludge-based biochar was pre-deashed using hydrochloric acid or hydrofluoric acid followed by potassium acetate activation. The results indicate that hydrochloric or hydrofluoric acid deashing can improve the pore parameters of sludge-based biochars and promote subsequent activation effect of potassium acetate. The specific surface area of biochar activated by potassium acetate after hydrochloric acid and hydrofluoric acid pretreatment increased from 583.36 m2/g to 718.70 m2/g and 991.55 m2/g, respectively. The enhancement of pore structure is conducive to enhancing the physical adsorption of lead on sludge-based biochar, while the chemical adsorption is not significantly affected at the same time. Thereby, the biochar and activated biochar pretreated with hydrofluoric acid showed better lead adsorption capacities (16.70 and 49.47 mg/g) than untreated biochar (7.56 and 38.49 mg/g).