超顺磁性纳米功能材料Fe_(3)O_(4)@Ca(H_(2)PO_(4))_(2)对Cd污染稻田土壤修复作用的研究  

Remediation of cadmium-contaminated paddy soil by superparamagnetic nano-functional material Fe_(3)O_(4)@Ca(H2PO4)

作　　者：江湘婷 张立志 万灿 孙圆鹏 黎洁 王强[1,2] JIANG Xiangting;ZHANG Lizhi;WAN Can;SUN Yuanpeng;LI Jie;WANG Qiang(School of Resources and Environment,Southwest University,Chongqing 400716;Chongqing Key Laboratory of Agricultural Resources and Environment Research,Chongqing 400716;Housing and Urban Rural Development Bureau of Fucheng District,Mianyang City,Mianyang 621000)

机构地区：[1]西南大学资源环境学院,重庆400716 [2]重庆市农业资源与环境研究重点实验室,重庆400716 [3]四川省绵阳市涪城区住房和城乡建设局,绵阳621000

出　　处：《环境科学学报》2024年第1期414-423,共10页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划项目(No.2017YFD0801004,2017YFD0801005)。

摘　　要：农田土壤镉(Cd)污染与危害不容忽视,亟需探索经济、高效的Cd污染土壤修复技术.采用共沉淀法制备超顺磁性纳米磷酸盐功能化材料(Magnetic nano-Fe_(3)O_(4)@Ca(H_(2)PO_(4))_(2),MFC),并用于重庆市某Cd污染稻田土壤磁选修复,在修复后的稻田栽培本地低Cd富集水稻“神9优28”和常规水稻“宜香优2115”,研究了施加MFC对土壤理化性质、土壤总Cd和有效态Cd含量、水稻根茎叶和籽粒Cd含量的影响.结果表明,MFC磁选修复Cd污染稻田土壤,显著提高了土壤全磷、有机质和阳离子交换量(CEC)含量;显著降低了土壤中的总Cd和有效态Cd含量,以施加1.0%功能化材料的降Cd效果最好,土壤中总Cd去除率为24.03%,有效Cd含量下降12.30%;两种水稻根、茎、叶和成熟期籽粒中Cd含量均显著降低,且低Cd富集品种糙米中的Cd含量显著低于常规品种.With the rapid development of industry and agriculture,various environmental pollution problems also come one after another,especially cadmium(Cd)pollution in farmland soil is becoming more and more serious.It is urgent to explore economic and efficient remediation technology for Cd-contaminated farmland soil.Superparamagnetic nano-phosphate functional material(magnetic nano-Fe_(3)O_(4)@Ca(H_(2)PO_(4))_(2)functionalized material,MFC)were prepared by coprecipitation method,and was used in the magnetic separation of Cd in a polluted paddy field in Chongqing.In addition,two local rice varieties,low-Cd-enriched variety(Shen 9 You 28)and conventional rice variety(Yixiangyou 2115)were cultivated in the restored paddy field,and the effects of MFC application on soil physicochemical properties,soil total Cd and available Cd contents,and Cd contents in rice roots,stems,leaves and grains were studied.The results showed that MFC magnetic separation could significantly increase the contents of soil total phosphorus,organic matter and cation exchange capacity(CEC),and significantly reduce soil total Cd and available Cd contents.When 1.0%functionalized material was applied,the removal efficiency of soil total Cd reached 24.03%,and the available Cd content reduced 12.30%.After MFC application,the Cd contents in the roots,stems,leaves and grains of two rice varieties reduced significantly,and those in brown rice of low-Cdenriched variety were significantly lower compared to the conventional variety.

关 键 词：磁性纳米材料 磷酸盐 稻田土壤 Cd 大田修复 

分 类 号：X53[环境科学与工程—环境工程]