Formation, aggregation, and transport of NOM-Cr(iii) colloids in aquatic environments

Li, Binrui1; Liao, Peng2,3; Liu, Peng1; Wang, Dengjun4; Ye, Zhihang1; Wang, Jingfu2; Chen, Jingan2; Ning, Zigong5; Jiang, Yi6; Liu, Chongxuan3

2022

10.1039/d1en00861g

Environmental Science-Nano   影响因子和分区

2051-8153

2051-8161

The complexation of natural organic matter (NOM) with chromium (Cr) represents an integral part of Cr cycling in nature. To date, most studies on the interaction of NOM with Cr(iii) have focused heavily on the geochemistry of soluble NOM-Cr(iii) complexes. However, there is a paucity of information regarding the colloidal chemistry of NOM-Cr(iii) particles, which leaves a critical knowledge gap on the fate and colloid-mediated transport of Cr(iii) particles. Herein, we explored the formation of NOM-Cr(iii) colloids across a wide range of aquatic conditions and quantified their microscopic structures as well as subsequent aggregation and transport behaviors using an array of complementary techniques. Batch results show that the formation and stability of NOM-Cr(iii) colloids depend on the C/Cr ratio and NOM source. The concentration and stability of NOM-Cr(iii) colloids increase with increasing molar C/Cr ratio. Suwannee river humic acid (SRHA)-Cr(iii) colloids are much more stable than Aldrich humic acid (AHA)-Cr(iii) colloids, likely due to lower cation bridging and stronger repulsive hydration interactions. Characterization of colloids demonstrates that Cr(iii) has six neighboring oxygen atoms in an octahedral geometry and that NOM is relatively enriched on the colloid surface which enhanced the particle stability through electrostatic and steric interactions. Examination of particle stability in natural waters indicates that NOM-Cr(iii) colloids can be stable in river waters and groundwaters with low electrolyte concentrations. Results from column studies further confirm that the stable NOM-Cr(iii) colloids can be transported readily during advective transport in the porous media. Collectively, these findings provide new mechanistic insights on the formation and stability of NOM-Cr(iii) colloids, which are essential for evaluating the long-term fate of Cr and optimizing Cr remediation technology in organic-rich environmental settings.

SCI ; EI

英语

通讯

Strategic Priority Research Program of Chinese Academy of Sciences[XDB40020000] ; National Natural Science Foundation of China[42177237,"U1612441"] ; Program for Guangdong Introducing Innovative and Entrepreneurial Teams[2017ZT07Z479] ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)[CUGGC06] ; Central Government Leading Local Science and Technology Development QianKeZhongYinDi[20214028]

Chemistry ; Environmental Sciences & Ecology ; Science & Technology - Other Topics

Chemistry, Multidisciplinary ; Environmental Sciences ; Nanoscience & Nanotechnology

WOS:000751922300001

ROYAL SOC CHEMISTRY

20221411917676

Agglomeration ; Chromium compounds ; Electrolytes ; Environmental technology ; Groundwater pollution ; Molar ratio ; Organic acids ; Porous materials ; Remediation ; Sols ; Stability

Groundwater:444.2 ; Water Pollution Sources:453.1 ; Environmental Engineering:454 ; Environmental Impact and Protection:454.2 ; Electric Batteries and Fuel Cells:702 ; Physical Chemistry:801.4 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Materials Science:951

Web of Science

1.China Univ Geosci, Sch Environm, 388 Lumo Rd, Wuhan 430074, Peoples R China
2.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China
3.Southern Univ Sci & Technol, Sch Environm Sci & Engn, State Environm Protect Key Lab Integrated Surface, Shenzhen 518055, Peoples R China
4.Auburn Univ, Sch Fisheries Aquaculture & Aquat Sci, Auburn, AL 36849 USA
5.Harbin Inst Technol, Sch Civil & Environm Engn, Shenzhen 518055, Peoples R China
6.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China

Li, Binrui,Liao, Peng,Liu, Peng,et al. Formation, aggregation, and transport of NOM-Cr(iii) colloids in aquatic environments[J]. Environmental Science-Nano,2022,9:1133-1145.

Li, Binrui.,Liao, Peng.,Liu, Peng.,Wang, Dengjun.,Ye, Zhihang.,...&Liu, Chongxuan.(2022).Formation, aggregation, and transport of NOM-Cr(iii) colloids in aquatic environments.Environmental Science-Nano,9,1133-1145.

Li, Binrui,et al."Formation, aggregation, and transport of NOM-Cr(iii) colloids in aquatic environments".Environmental Science-Nano 9(2022):1133-1145.