Facilitated transport of Cu with hydroxyapatite nanoparticles in saturated sand: Effects of solution ionic strength and composition

详细信息    查看全文

• 作者：Dengjun  ; Wang^a ;   ; ^g ; Marcos  ; Paradelo^b ; Scott A.  ; Bradford^c ; Willie J.G.M.  ; Peijnenburg^d ;   ; ^e ; Lingyang  ; Chu^a ;   ; ^f ; Dongmei  ; Zhou^a ;   ; ^{dmzhou@issas.ac.cn}
• 关键词：Hydroxyapatite nanoparticles (nHAP) ; Cu ; nHAP-facilitated Cu (nHAP-F Cu) ; Co-transport ; Ionic strength (IS) ; Ionic composition (IC)
• 刊名：Water Research
• 出版年：2011
• 出版时间：15 November 2011
• 年：2011
• 卷：45
• 期：18
• 页码：5905-5915
• 全文大小：711 K

文摘

Column experiments were conducted to investigate the facilitated transport of Cu in association with hydroxyapatite nanoparticles (nHAP) in water-saturated quartz sand at different solution concentrations of NaCl (0?00?mM) or CaCl₂ (0.1?.0?mM). The experimental breakthrough curves and retention profiles of nHAP were well described using a mathematical model that accounted for two kinetic retention sites. The retention coefficients for both sites increased with the ionic strength (IS) of a particular salt. However, the amount of nHAP retention was more sensitive to increases in the concentration of divalent Ca²⁺ than monovalent Na⁺. The effluent concentration of Cu that was associated with nHAP decreased significantly from 2.62 to 0.17?mg?L^? when NaCl increased from 0 to 100?mM, and from 1.58 to 0.16?mg?L^? when CaCl₂ increased from 0.1 to 1.0?mM. These trends were due to enhanced retention of nHAP with changes in IS and ionic composition (IC) due to compression of the double layer thickness and reduction of the magnitude of the zeta potentials. Results indicate that the IS and IC had a strong influence on the co-transport behavior of contaminants with nHAP nanoparticles.