Integrated comparisons of thorium(IV) adsorption onto alkali-treated duckweed biomass and duckweed-derived hydrothermal and pyrolytic biochar

被引：25

作者：

Chen, Ting ^{[1
]}

Zhang, Nan ^{[1
]}

Xu, Zhao ^{[1
]}

Hu, Xin ^{[2
,3
]}

Ding, Zhuhong ^{[1
]}

机构：

[1] Nanjing Tech Univ, Sch Environm Sci & Engn, 30 Puzhu Southern Rd, Nanjing 211816, Jiangsu, Peoples R China

[2] Nanjing Univ, State Key Lab Analyt Chem Life Sci, Ctr Mat Anal, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China

[3] Nanjing Univ, Sch Chem & Chem Engn, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China

来源：

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2019年 / 26卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Radionuclide; Biosorbent; Biochar; Integrated characterization; Sorption; AQUEOUS-SOLUTIONS; RAMAN-SPECTROSCOPY; SLOW PYROLYSIS; HEAVY-METALS; SORPTION; CARBON; REMOVAL; WATER; CARBONIZATION; TEMPERATURE;

D O I：

10.1007/s11356-018-3789-x

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In order to remove aqueous radionuclides and find an appropriate method for the disposal of wild duckweed in eutrophic water body, alkali-treated duckweed biomass and duckweed-based hydrothermal biochar (hydrochar) and pyrolytic biochars of 300 and 600 degrees C were prepared. Their physicochemical properties were characterized carefully. The adsorption isothermal data fitted well with the Langmuir model and the maximum Langmuir adsorption capacities were 104.1, 96.3, 86.7, and 63.5mg/g for hydrochar, modified biomass, and 300 and 600 degrees C biochars, respectively. The adsorption kinetic data fitted well with the pseudo-second-order kinetic equation. The sorption data of fixed-bed column also confirmed the high efficient removal of Th(IV) and fitted well with the Thomas model. The duckweed-based hydrothermal biochar is a low-cost adsorbent for Th(IV) removal, and it is also a resource utilization technology of the duckweed collected from eutrophic water body.

引用

页码：2523 / 2530

页数：8

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