http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Heavy metal removal from aqueous solution by granular hydrated Portland cement
Peng Cheng,Yongxiang Ren,Lei Yang,Rituan Li,Xue Wang,Bin Li,Honglin Yuan 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12
Granular hydrated Portland cement (HPC) was prepared as adsorbent to remove heavy metals in aqueoussolution. Batch experiment results confirmed that heavy metals were removed through a combination of adsorptionand precipitation. Adsorption played a more important role in the initial stage of the removal process or at lower concentrationsof the heavy metals. After adsorption equilibrium was obtained in two days, the removal process continuedfor about three days due to the precipitation. Besides precipitation, the maximum Langmuir adsorption capacity reached132.27, 87.14, 123.43 and 112.05mg/g for Pb, Cu, Zn, and Cd, respectively. When various heavy metals coexisted, theremoval capacity followed the order of Cu>Pb>Cd>Zn. The adsorption on the surfaces of HPC was mainly governedby surface precipitation and Ca2+ exchange, as suggested by XRD, SEM-EDS and released Ca2+ results. Most of theadsorbed heavy metals on the HPC and the precipitation formed in the liquid phase were stable under neutral andalkaline conditions. Overall, HPC particles exhibited a large potential for heavy metal removal. When cement-relatedmaterials containing HPC are employed for heavy metal removal, the dissolution of the precipitate at low pH mightfacilitate the migration of the heavy metals.