Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第25卷    第9期    总第198期    2015年9月

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文章编号:1004-0609(2015)-09-2604-08
木屑季铵螯合吸附剂的制备及其吸附铀矿酸法废水中U(VI)
邓文静1,周书葵1, 2,刘迎九1,曾光明2,江海浩1,康丽1,方良1

(1. 南华大学城市建设学院,衡阳421001;
2. 湖南大学环境科学与工程学院,长沙 410082
)

摘 要: 针对铀矿中酸法含铀废水处理的难点,利用木屑制备季铵盐型螯合吸附剂(MS)强化其除铀效果。研究环氧氯丙烷(ECH)添加量、二乙烯三胺(DETA)添加量、醚化反应时间、接枝反应时间对木屑的改性效果及其对废水中U(VI)吸附效果的影响,获取制备MS的最佳工艺条件。对MS进行表征分析并探讨吸附剂的改性机理。单因素实验结果表明:随着ECH、DETA添加量的增加及醚化时间的延长,MS对U(VI)的吸附性能先增大后减小;而随着接枝时间的增加,MS对U(VI)的吸附效果先增大而后基本保持不变。正交优化实验结果表明:对U(VI)吸附性能的影响醚化反应时间最大,接枝反应时间次之,ECH、DETA添加量最小。最优制备条件为ECH添加量10 mL,DETA添加量6 mL,醚化反应时间1 h,接枝反应时间4 h,此时MS对U(VI)的吸附率为99.72%,吸附量达99.72 mg/g。

 

关键字: 木屑;季铵盐;U(VI);吸附

Preparation of quaternary ammonium salt modifiedsawdust chelate adsorbent and its U(VI) adsorption inwastewater from uranium milling plant
DENG Wen-jing1, ZHOU Shu-kui1, 2, LIU Ying-jiu1, ZENG Guang-ming2, JIANG Hai-hao1, KANG Li1, FANG Liang1

1.School of Urban Construction, University of South China, Hengyang 421001, China;
2. School of Environment Science and Engineering, Hunan University, Changsha 410082, China

Abstract:The problem of processing uranium wastewater in the uranium milling plant was studied by preparing a kind of quaternary ammonium salt chelate adsorbent (MS) to strengthen the effect of adsorbing uranium. The effects of epichlorohydrin dosage, diethylenetriamine dosage, etherification reaction time, grafting reaction time on the modification effect of sawdust and its U(VI) adsorption in wastewater were studied, and the optimal technological conditions for preparing MS were gotten. And the MS was characterized and the modification mechanism of the adsorbent was studied. The single factor test result shows that with the increase of ECH dosage, DETA dosage and etherification reaction time, U(VI) adsorption increases and then decreases, and with the increase of grafting reaction time, U(VI) adsorption increases and then keeps unchanged. The orthogonal test result shows that the largest effect for U(VI) adsorption is etherification reaction time, then grafting reaction time, and the smallest effect for U(VI) adsorption is ECH and DETA dosage. The technological parameters optimized by conducting orthogonal test for the U(VI) adsorption are epichlorohydrin dosage of 10 mL, diethylenetriamine dosage of 6 mL, etherification reaction time of 1 h, grafting reaction time of 4 h. Under this condition, the highest adsorption rate is 99.72% and the highest adsorption capacity is 99.72 mg/g.

 

Key words: sawdust; quaternary ammonium salt; U(VI); adsorption

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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