Abstract：Effects of acidic treatment (1mol/L HCl), alkaline treatment (1mol/L NaOH), oxidizing treatment (30% H2O2) and high temperature-freezing and thawing treatment (repeated 70℃ and -22℃) on the surface properties and Zn(II) adsorption capacity of PE microplastics were studied. Results showed that all four aging treatments induced the presence of wrinkled structures on the surface of PE microplastics, but no chemical change was found. All four aging treatments increased the adsorption of Zn(II) onto PE microplastics, and the adsorption capacity of PE microplastics followed the decreasing tendency:alkali treated PE microplastics > acid treated PE microplastics > oxidition treated PE microplastics > high temperature-freezing and thawing treated PE microplastics > virgin PE microplastics. The adsorption kinetics fitted well with Lagrange pseudo-second-order kinetics and W-M particle diffusion model, implying that multi-processes were involved in the adsorption. The adsorption isotherm consisted with Langmuir and D-R model, suggesting that the adsorption was a physical process. The wrinkled structures present on the surface were the main reasons for the increase of Zn(II) adsorption capacity of aged PE microplastics.
Kershaw P J, Rochman C M. Sources, fate and effects of microplastics in the marine environment:A global assessment[R]. Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection (GESAMP), 2017.
[2]
Zhang H B, Zhou Q, Xie Z Y, et al. Occurrences of organophosphorus esters and phthalates in the microplastics from the coastal beaches in north China[J]. Science of the Total Environment, 2017,616-617:1505-1512.
[3]
Fok L, Cheung P K. HongKong at the Pearl River Estuary:A hotspot of microplastic pollution[J]. Marine Pollution Bulletin, 2015,99(1/2):112-118.
[4]
Su L, Xue Y G, Li L Y, et al. Microplastics in Taihu Lake, China[J]. Environmental Pollution, 2016,216:711-719.
[5]
徐沛,彭谷雨,朱礼鑫,等.长江口微塑料时空分布及风险评价[J]. 中国环境科学, 2019,39(5):2071-2077. Xu P, Peng G Y, Zhu L X, et al. Spatial-temporal distribution and pollution load of microplastics in the Changjiang Estuary[J]. China Environmental Science, 2019,39(5):2071-2077.
[6]
Liu H F, Yang X M, Liu G B, et al. Response of soil dissolved organic matter to microplastic addition in Chinese loess soil[J]. Chemosphere, 2017,185:907-917.
[7]
Liebezeit G,. Liebezeit E. Non-pollen particulates in honey and sugar[J]. Food Additives and Contaminants:Part A Chemistry, Analysis, Control, Exposure and Risk Assessment, 2013,30(12):2136-2140.
[8]
Neves D, Sobral P, Ferreira J L, et al. Ingestion of microplastics by commercial fish off the Portuguese coast[J]. Marine Pollution Bulletin, 2015,101(1):119-126.
[9]
Lechner A, Ramler D. The discharge of certain amounts of industrial microplastic from a production plant into the River Danube is permitted by the Austrian legislation[J]. Environmental Pollution, 2015,200:159-160.
[10]
刘沙沙,付建平,郭楚玲,等.微塑料的环境行为及其生态毒性研究进展[J]. 农业环境科学学报, 2019,38(5):957-969. Liu S S, Fu J P, Gup C L, et al. Research progress on environmental behavior and ecological toxicity of microplastics[J]. Journal of Agro-Environment Science, 2019,38(5):957-969.
[11]
Li X W, Mei Q Q, Chen L B, et al. Enhancement in adsorption potential of microplastics in sewage sludge for metal pollutants after the wastewater treatment process[J]. Water Research, 2019,157(15):228-237.
[12]
Turner A,. Holmes L A. Adsorption of trace metals by microplastic pellets in fresh water[J]. Environmental Chemistry, 2015,12(5):600-610.
[13]
Zhang H B, Wang J Q, Zhou B Y, et al. Enhanced adsorption of oxytetracycline to weathered microplastic polystyrene:Kinetics, isotherms and influencing factors[J]. Environmental Pollution, 2018, 243:1550-1557.
[14]
陈守益,郭学涛,庞敬文.微塑料对泰乐菌素的吸附动力学与热力学[J]. 中国环境科学, 2018,38(5):1905-1912. Chen S Y, Guo X T, Pang J W. Sorption kinetics and thermodynamics study of tylosin by microplastics[J]. China Environmental Science, 2018,38(5):1905-1912.
[15]
张凯娜,李嘉,李晓强,等.微塑料表面土霉素的吸附-解吸机制与动力学过程[J]. 环境化学, 2017,36(12):2531-2540. Zhang K N, Li J, Li X Q, et al. Mechanisms and kinetics of oxytetracycline adsorption-desorption onto microplastics[J]. Environmental Chemistry, 2017,36(12):2531-2540.
[16]
赵楚云,李小伟,张鸿元,等.化学预处理对微塑料Pb吸附潜力的影响及机理研究[J]. 环境科学学报, 2019,39(10):3387-3394. Zhao C Y, Li X W, Zhang H Y, et al. Effect of chemical pretreatment on adsorption of Pb to microplastics[J]. Acta Scientiae Circumstantiae, 2019,39(10):3387-3394.
[17]
Desforges J P W, Galbraith M, Ross P S. Ingestion of microplastics by Zooplankton in the Northeast Pacific Ocean[J]. Archives of Environmental Contamination & Toxicology, 2015,69(3):320-330.
[18]
周倩,章海波,周阳,等.滨海河口潮滩中微塑料的表面风化和成分变化[J]. 科学通报, 2018,63(2):214-223. Zhou Q, Zhang H B, Zhou Y, et al. Surface weathering and changes in components of microplastics from estuarine beaches[J]. Chinese Science Bulletin, 2018,63(2):214-223.
[19]
Wijesekara H, Bolan N S, Bradney L, et al. Trace element dynamics of biosolids-derived microbeads[J]. Chemosphere, 2018,199:331-339.
[20]
Ceccarini A, Corti A, Erba F, et al. The hidden microplastics:new Insights and figures from the thorough separation and characterization of microplastics and of their degradation byproducts in coastal sediments[J]. Environmental Science & Technology, 2018,52(10):5634-5643.
[21]
Ho Y S, Ng J C Y, Mckay G. Kinetics of pollutant sorption by biosorbents:review[J]. Separation & Purification Methods, 2000, 29(2):189-232.
[22]
Martins A C, Pezoti O, Cazetta A L, et al. Removal of tetracycline by NaOH-activated carbon produced from macadamia nut shells:Kinetic and equilibrium studies[J]. Chemical Engineering Journal, 2015,260:291-299.
[23]
Ma J, Yang M X, Yu F, et al. Water-enhanced removal of ciprofloxacin from water by porous graphene hydrogel[J]. Scientific Report, 2015, 5:13578.
[24]
Chen S H, Yue Q Y, Gao B Y, et al. Equilibrium and kinetic adsorption study of the adsorptive removal of Cr(VI) using modified wheat residue[J]. Journal of Colloid & Interface Science, 2010,349(1):256-264.
[25]
Putra E K, Pranowo R, Sunarso J, et al.Performance of activated carbon and bentonite for adsorption of amoxicillin from wastewater:mechanisms, isotherms and kinetics[J]. Water Research, 2009,43(9):2419-2430.
[26]
Yu L, Luo Y M, The adsorption mechanism of anionic and cationic dyes by Jerusalem artichoke stalk -based mesoporous activated carbon[J]. Journal of Environmental Chemical Engineering, 2013,2(1):220-229.
[27]
Zhou. Q, Zhang H B, Fu C C, et al. The distribution and morphology of microplastics in coastal soils adjacent to the Bohai Sea and the Yellow Sea[J]. Geoderma, 2018,322:201-208.
[28]
张文,董志强,黄睿,等.海洋多孔介质中微塑料和富勒烯的共迁移[J]. 中国环境科学, 2019,39(12):5063-5068. Zhang W, Dong Z Q, Huang R, et al. Cotransport of microplastics and fullerene in marine porous media[J]. China Environmental Science, 2019,39(12):5063-5068.
[29]
Graca B,. Bełdowska M, Wrzesień P, et al. Styrofoam debris as a potential carrier of mercury within ecosystems[J]. Environmental Science and Pollution Research, 2014,21(3):2263-2271.
