Insights into mechanisms of hexavalent chromium removal from aqueous solution by using rice husk pretreated using hydrothermal carbonization technology

被引：29
|
作者：
Ding, Dahu [1 ]
Ma, Xin [2 ]
Shi, Wansheng [2 ]
Lei, Zhongfang [2 ]
Zhang, Zhenya [2 ]
机构：
[1] Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China
[2] Univ Tsukuba, Grad Sch Life & Environm Sci, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058572, Japan
来源：
RSC ADVANCES | 2016年 / 6卷 / 78期
关键词：
CR(VI) REMOVAL; LOW-COST; AGRICULTURAL WASTE; FUNGAL BIOMASS; ADSORPTION; CARBON; BIOSORPTION; WATER; REDUCTION; STRAW;
D O I：
10.1039/c6ra17707g
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A typical agricultural biomass waste, rice husk (RH) was pretreated using simple one-step hydrothermal carbonization (HTC) technology (170-280 degrees C) and used for hexavalent chromium (Cr(vi)) removal from aqueous solutions. The effects of HTC pretreatment temperature and reaction time on their adsorption capacity towards Cr(vi) were investigated. Specifically, the mechanisms involved in the removal process were elucidated. According to the results, the optimum pretreatment conditions were found to be 240 degrees C and 1 h. Adsorption played a much more important role than reduction mechanism. When the solution pH was lower than 3, the adsorption process was suppressed and the reduction process was enhanced. The present results show that the novel HTC pretreated RH is a promising adsorbent for Cr(vi) removal.
引用
收藏
页码：74675 / 74682
页数：8
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