纳米氧化锌溶解性及共存镉离子的影响  

Dissolution ability of nano-zno and the influence of co-existing Cd2+

作　　者：李帅 杨明达 王发园[2] LI Shuai;YANG Mingda;WANG Fayuan(Institute of Resources,Environment,and Agricultural Product Quality and Safety,Shangqiu Academy of Agriculture and Forestry Sciences,Shangqiu 476000,China;College of Environment and Safety Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]商丘市农林科学院资源环境与农产品质量安全研究所,商丘476000 [2]青岛科技大学环境与安全工程学院,青岛266042

出　　处：《环境保护科学》2024年第4期71-76,86,共7页Environmental Protection Science

基　　金：国家自然科学基金面上项目(41471395)。

摘　　要：纳米ZnO是应用最为广泛但具有一定生物毒性的金属型纳米颗粒之一,其致毒机制之一可能来自其溶解释放的锌离子。共存重金属离子可能会影响纳米ZnO的溶解,反之,纳米ZnO可能吸附去除重金属离子,但是其相关作用尚不清楚。文章通过批试验探讨了不同纳米ZnO投加量(200、400、1000和2000 mg/L)在不同震荡时间(12、24和36 h)时纳米ZnO的溶解性及共存镉离子的影响。结果表明,去离子水中纳米ZnO投加量1000 mg/L时锌的溶出量最大(3.71 mg/L),但不受震荡时间的影响。添加1 mg/mL的镉离子显著增加了纳米ZnO的溶解,在纳米ZnO投加量为200 mg/L时,锌离子的溶出量和溶出率高达95 mg/L和55%;增加纳米ZnO投加量降低锌离子含量和溶出率,但增加震荡时间没有增加其溶解性。同时,纳米ZnO能够降低镉离子浓度,说明纳米ZnO可以吸附水中的镉离子。总之,共存镉离子能够改变纳米ZnO的环境行为,并可能因而影响其生物毒性。As one of the most widely used metal-based nanoparticles,nano-ZnO is toxic to organisms.One of the toxic mechanisms can be described as the dissolved zinc ions from nanoparticles.The coexistence of heavy metals may change the solubility of nano-ZnO,whereas nano-ZnO may remove Cd2+via adsorption,but the interactions between them remain unclear.Batch experiments were conducted to study the dissolution ability of nano-ZnO at different doses(200,400,1000,and 2000 mg/L)under different shaking times(12,24,and 36 h),as well as the influence of co-existing Cd2+.The results showed that in deionized water 1000 mg/L nano-ZnO led to the highest dissolution of Zn(3.71 mg/L),but the dissolution of nano-ZnO was not affected by the shaking time.The addition of 1 mg/mL Cd2+significantly enhanced the dissolution of nano-ZnO.When the dosage of nano-ZnO was 200 mg/L,the dissolution amount and dissolution percentage of Zn2+reached as high as 95 mg/L and 55%respectively.Increasing the dosage of nano-ZnO reduced the content and dissolution percentage of Zn2+,but increasing the shaking time did not enhance the dissolution of nano-ZnO.Nano-ZnO reduced Cd2+concentrations,indicating that nano-ZnO could adsorb Cd2+.In conclusion,co-existing Cd2+could change the environmental behavior of nano-ZnO,thus potentially altering its toxicity to organisms.

关 键 词：纳米ZNO 镉离子 溶解度 溶出率 环境行为 

分 类 号：X703[环境科学与工程—环境工程]