期刊
BIORESOURCE TECHNOLOGY
卷 273, 期 -, 页码 70-76出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.10.065
关键词
Pb(II) adsorption; Wheat straw; Carbonization; Ball milling; Competitive mechanism
资金
- National Natural Science Foundation of China [31271611]
- Innovation Team Project of Education Ministry [IRT_17R105]
Straw biomass is a promising adsorbent for the removal of heavy metals. To improve its Pb(II) adsorption capacity and elucidate competition of adsorption mechanisms (e.g., ion exchange and precipitation), the Pb(II) adsorption mechanisms for wheat straw (WS-CK), wheat straw-biochar (WS-BC), and ball-milled wheat strawbiochar (WS-BC+ BM) samples were investigated in detail by EDX, XRD, and FTIR. The results implied that the Pb(II) adsorption capacities at an adsorbent dosage of 0.2 g/L onto WS-CK, WS-BC, and WS-BC+ BM were 46.33, 119.55, and 134.68 mg/g, respectively. This indicates that carbonization and ball milling are efficient techniques for improving the adsorption capacity of Pb(II) onto wheat straw, as WS-BC and WS-BC+ BM exhibited adsorption capacities comparable to other commonly used bioadsorbents. Carbonization contributed significantly to precipitation (e.g., PbCO3 and Pb-3(CO3)(2)(OH)(2)). Furthermore, competition existed between ion exchange and precipitation during the Pb(II) adsorption process. With relative lower adsorbent dosages, carbonization and ball milling enhanced ion exchange capacity.
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