Abstract：Aiming at the remediation of heavy metal pollutants in soils, a soil column penetration test was carried out with quartz sand as porous medium material and graphene oxide as adsorbent under different types of heavy metals, concentrations of heavy metal pollutants, injected concentrations of graphene oxide and seepage velocity. For the case of a single heavy metal, the removal effect of graphene oxide and the curing mechanism were studied. The test results showed that the change of seepage velocity had little effect on the transport of single heavy metal ions (Pb2+ or Cd2+). When graphene oxide penetrates the contaminated soil column, low heavy metal pollution concentration and high seepage velocity promoted the transport of graphene oxide, and then promoted the transport of heavy metals. Graphene oxide had a good removal and immobilization effect on heavy metals (Pb2+ and Cd2+). The maximum curing ratios for lead ion and cadmium ion were 88.2% and 63.9%. In addition, SEM, FTIR and zeta potential tests showed that the adsorption mechanism of graphene oxide for heavy metal ions was mainly attributed to the electrostatic attraction, ion exchange and surface complexation. According to the calculation results of DLVO, the graphene oxide loaded with heavy metals was easier to immobilize in the soil than the graphene oxide not loaded with heavy metals. Among them, the graphene oxide loaded with cadmium ions was easier to immobilize in the soil than the graphene oxide loaded with lead ions.
武海燕, 白冰. 氧化石墨烯固化土壤中重金属离子的有效性及界面能特征[J]. 中国环境科学, 2023, 43(3): 1277-1287.
WU Hai-yan, BAI Bing. Availability and interfacial energy characteristics of heavy metal ions in soils solidified by graphene oxide. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1277-1287.
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