改性凹凸棒土对土壤中Cd~(2+)吸附解吸及钝化效果影响
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摘要
以凹凸棒土为原材料进行了热改性、酸改性、壳聚糖负载改性,并采用SEM、FT-IR、XRD表征其结构变化。通过改性凹凸棒土对土壤Cd~(2+)吸附解吸及土柱淋溶实验表明:凹凸棒土及改性凹凸棒土均能有效提高土壤对Cd~(2+)的吸附容量,减少Cd~(2+)的纵向迁移,降低淋溶风险。改性凹凸棒土主要是通过降低土壤中Cd的交换态和碳酸结合态含量增加土壤中Cd的铁锰氧化结合态及有机态含量,达到钝化土壤中Cd效果,综合处理效果优劣顺序为热改性凹凸棒土>酸改性凹凸棒>凹凸棒土>壳聚糖改性凹凸棒土>空白。
Thermal modification,acid modification and chitosan loading modification were performed using attapulgite as a raw material. The structure was characterized by SEM,FT-IR and XRD. Adsorption and desorption of soil and soil column leaching experiments by modified attapulgite showed that attapulgite and modified attapulgite could effectively increase the Cd~(2+)adsorption capacity of the soil,reduce the longitudinal migration of Cd~(2+)and risk of leaching. The modified attapulgite mainly increased the oxidized and organic iron-manganese content of Cd by reducing the exchangeable state and carbonation-bound content of Cd to immobilization Cd in soil. Comprehensive treatment showed that thermal modified attapulgite>acid modified attapulgite>attapulgite>chitosan loading modified attapulgite>Blank.
Thermal modification,acid modification and chitosan loading modification were performed using attapulgite as a raw material. The structure was characterized by SEM,FT-IR and XRD. Adsorption and desorption of soil and soil column leaching experiments by modified attapulgite showed that attapulgite and modified attapulgite could effectively increase the Cd~(2+)adsorption capacity of the soil,reduce the longitudinal migration of Cd~(2+)and risk of leaching. The modified attapulgite mainly increased the oxidized and organic iron-manganese content of Cd by reducing the exchangeable state and carbonation-bound content of Cd to immobilization Cd in soil. Comprehensive treatment showed that thermal modified attapulgite>acid modified attapulgite>attapulgite>chitosan loading modified attapulgite>Blank.
引文
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[18]李增新,王国明,孟韵,等.壳聚糖对污染土壤中吸附态镉的提取效果研究[J].安全与环境学报,2008(5):51-54.
[2] Li Z Y,Ma Z W,vander Kuijp T J,et al. A review of soil heavy metal pollution from mines in China:pollution and health risk assessment[J]. Science of the Total Environment,2014,468/469:843-853.
[3]陈涛,常庆瑞,刘京,等.长期污灌农田土壤重金属污染及潜在环境风险评价[J].农业环境科学学报,2012,31(11):2152-2159.
[4] Wei B G,Yang L S. A review of heavy metal contaminations in urban soils,urban road dusts and agricultural soils from China[J].Microchemical Journal,2010,94:99-107.
[5]宁东峰.土壤重金属原位钝化修复技术研究进展[J].中国农学通报,2016,32(23):72-80.
[6] Cui H B,Zhou J,Si Y B,et al. Immobilization of Cu and Cd in a contaminated soil:one-and four-year field effects[J]. Journal of Soils and Sediments,2014,14:1397-1406.
[7] He M,Shi H,Zhao X Y,et al. Immobilization of Pb and Cd in contaminated soil using nano-crystallite hydroxyapatite[J].Procedia Environmental Sciences,2013,18:657-665.
[8]郭晓方,卫泽斌,谢方文,等.过磷酸钙与石灰混施对污染农田低累积玉米生长和重金属含量的影响[J].环境工程学报,2012,6(4):1374-1380
[9]汤帆,胡红青,苏小娟,等.磷矿粉和腐熟水稻秸秆对土壤铅污染的钝化[J].环境科学,2015,36(8):3062-3067.
[10] Mamindy-Pajany Y,Hurel C,Geret F,et al. Comparison of mineralbased amendments for ex-situ stabilization of trace elements(As,Cd,Cu,Mo,Ni,Zn)in marine dredgedsediments:a pilot-scale experiment[J] Journal of Hazardous Materials,2013,252/253:213-219.
[11] Liu P,Zhang L X. Adsorption of dyes from aqueous solutions or suspensions with clay nano-adsorbents[J]. Separation and Purication Technology,2007,58:32-39.
[12] Ahmed A,Ahmad J,Rashid A. Aspectsof cationic dye molecule adsorption to palygorakite[J].Desalination,2007,214:327-342.
[13]黄智伟,王宪,邱海源,等.土壤重金属含量的微波法与电热板消解法测定的应用比较[J].厦门大学学报(自然科学版),2007,46(增刊1):103-106.
[14] Lei C,Tian X P,Ma B H. Effect of pH,ionic strength,foreign ions and temperatures on the sorption of Eu(Ⅲ)on attapulgiteiron oxide magnetic composites[J].J Radioanal Nucl Chem,2013,298(10):1127-1135.
[15]章绍康,王光辉,徐兰.壳聚糖及其衍生物在环境污染治理中的应用[J].化工环保,2015,35(2):154-158.
[16]殷萌,刘红,刘梦佳,等.高温改性凹凸棒土钝化城市污泥中重金属研究[J].环境科学与技术,2017,40(6):93-97.
[17]施冬雷,乔仁静,许琦.酸改性凹凸棒土的制备及其脱汞性能[J].合成化学,2015,23(8):720-724.
[18]李增新,王国明,孟韵,等.壳聚糖对污染土壤中吸附态镉的提取效果研究[J].安全与环境学报,2008(5):51-54.