首页|比较三种稳定剂对FeS纳米颗粒的稳定效果及对水土中镉的固定与去除性能的影响

比较三种稳定剂对FeS纳米颗粒的稳定效果及对水土中镉的固定与去除性能的影响

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本研究评估了三种多糖稳定剂(羧甲基纤维素钠(CMC)、羧甲基淀粉钠(CMS)和一种水溶性淀粉)用于稳定FeS纳米颗粒的有效性，并测试了相应稳定化纳米颗粒在水和土壤中固定Cd2+的性能。使用0。010 wt%CMC、0。025 wt%CMS或0。065 wt%淀粉可获得完全稳定的FeS纳米颗粒(100 mg/L FeS)。CMC-FeS表现出较高的zeta负电位，淀粉-FeS保持中性，而CMS-FeS则表现出中等负电位。CMC-FeS对Cd2+的吸附速率最快，吸附容量也最高。当用100 mg/L CMC-FeS或CMS-FeS处理一种含Cd土壤(58。3 mg/kg Cd)后，Cd的TCLP浸出率分别降低了88。4%和68。0%。CMC-FeS和CMS-FeS均可在模型土壤中运移，显示出其在土壤中原位固定Cd2+方面的潜力。土壤穿透曲线实验表明，CMC-FeS在4。5个孔体积，CMS-FeS在约25个孔体积处几乎完全穿透。柱实验结果表明，当用55个孔体积的CMC-FeS或CMS-FeS悬浮液(100 mg/L)处理该含Cd土壤后，Cd的水浸出率分别降低了98。2%和98。0%。根据目标污染物、材料在土壤中的传输特性和材料成本，可找到这三种稳定剂在土壤修复中的最佳应用。
Comparing three stabilizers for stabilizing FeS nanoparticles:Performance and effects on immobilization of cadmium in water and soil
In this study,we evaluated effectiveness of three polysaccharide stabilizers(sodium carboxymethyl cellulose(CMC),sodium carboxymethyl starch(CMS),and a water-soluble starch)for stabilizing FeS nanoparticles,and tested the stabilized nanoparticles for immobilization of Cd2+in water and soil.Fully stabilized FeS nanoparticles(100 mg/L FeS)were obtained using 0.010 wt%CMC,0.025 wt%CMS,or 0.065 wt%starch.CMC-FeS showed a highly negative zeta potential,starch-FeS remained neutral,whereas CMS-FeS displayed a moderately negative potential.CMC-FeS showed the fastest sorption rate and highest sorption capacity for Cd2+.When a Cd-laden soil(58.3 mg/kg Cd)was amended with 100 mg/L CMC-FeS or CMS-FeS,the TCLP-leachable Cd was reduced by 88.4%and 68.0%,respectively.Both CMC-FeS and CMS-FeS were transportable through a model soil and showed high potential for in-situ immobilization of Cd2+in soil.Nearly complete breakthrough occurred at 4.5 pore volumes(PVs)for CMC-FeS and about 25 PVs for CMS-FeS.When the Cd-laden soil was treated with 55 PVs of CMC-FeS and CMS-FeS suspensions(100 mg/L),the water-leachable soluble Cd was reduced by 98.2%and 98.0%,respectively.The three stabilizers may find their best uses in soil remediation according to the target contaminants,transport properties in soil,and material cost.

iron sulfide nanoparticlestabilizerheavy metalcontaminant immobilizationsoil remediationgroundwater contamination

田舒婷、赵东叶、霍丽娟、马骏、杨睿

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Department of Environmental Science,School of Environment and Resources,Taiyuan University of Science and Technology,Taiyuan 030024,China

Environmental Engineering Program,Department of Civil&Environmental Engineering,Auburn University,Auburn,AL 36849,USA

Department of Civil,Construction,and Environmental Engineering,San Diego State University,San Diego,CA 92182,USA

硫化铁纳米颗粒 稳定剂 重金属 污染物固定 土壤修复 地下水污染

Fundamental Research Program of Shanxi ProvinceMinistry of Education's"Chunhui Plan"Cooperative Scientific Research Project,ChinaOpen Fund from the Key Lab of Ecorestoration of Regional Contaminated Environment(Shenyang University)教育部项目Doctoral Foundation of Taiyuan University of Science and Technology,ChinaScientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province,ChinaStartup Funds of San Diego State University,USASpecial Fund for Science and Technology Innovation Teams of Shanxi Province,China

202203021212308HZKY20220508KF-22-16202220202022L297202304051001016

2024

10.1007/s11771-024-5602-y

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(4)
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