Progress 09/30/13 to 02/08/18
Outputs
Target Audience:
Nothing Reported
Changes/Problems:PI retired. Terminate without final report. What opportunities for training and professional development has the project provided?
Nothing Reported
How have the results been disseminated to communities of interest?
Nothing Reported
What do you plan to do during the next reporting period to accomplish the goals?
Nothing Reported
Impacts
What was accomplished under these goals?
Nothing to report.
Publications
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Progress 10/01/15 to 09/30/16
Outputs
Target Audience:
Nothing Reported
Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided?One MS graduate student and one research scientist was trained. How have the results been disseminated to communities of interest?Results were shared with landowners of the groundwater from Torrington and Jackson, Wyoming. A research article was published in Scientific Reports journal. What do you plan to do during the next reporting period to accomplish the goals?
Nothing Reported
Impacts
What was accomplished under these goals?
Project Accomplishments: Twoidentical polycarbonate point-of-use flow-through columnfilters with CuO nanoparticles (CuO-NPs)were designed for field testing. The basic design of the filter is derived from previouslab experiments. However, several key modifications were made to this column design to allow for it to be operated in the field at ten times the flow rate used in previous studies. Contact time in the point-of-use filter of the CuO-NP and arsenic laden groundwater was approximately 2 min. Experiments were conducted on twodifferent groundwater samples (Torrington and Jackson) from Wyoming. For each groundwater sample, three tests were performed; one control (without CuO-NP) and two duplicate runs with CuO-NP. Following the initial treatment of arsenic laden water with CuO-NPs, the CuO-NP were regenerated in the field. All regeneration wash fluids were collected at the outlet and fully characterized for anion and cation concentrations. After the regeneration process, the flow-through filtration process was repeated using the regenerated CuO-NP. The initial flow-through process using CuO-NP as-prepared, regeneration of the CuO-NP, and second flow through using regenerated CuO-NP were performed. Additionally, control runs with the respective groundwater samples were conducted without CuO-NP in order to determine the effect of the glass filters and sand alone in the point-of-use filter column. A total of 20L for eachgroundwater well wastreated at a flow rate of 10L per hr.Sampling for all twogroundwater samples when treated with CuO-NP was conducted at 0, 5, 10, 20, 35, and 60 min, a control sample before testing, and a composite sample of all the water treated by the point-of-use filter were collected during the test. The same sampling protocol was used for the regenerated CuO-NP. The control tests for the twogroundwater samples were sampled at 0, 5, 10, 20, 35, 60, 90, 120 min. The difference in sampling protocol was due to the lack of a regeneration step during the control tests. All samples collected were measured for pH,arsenic, major cations and anions, and trace elements, including copper. The pH of Torrington and Jackson groundwater samples were 7.22 and 7.50, respectively. The concentration of arsenic at each field location exceeds the 0.01 mg/L MCL recommended by the USEPA and WHO for drinking water. Arsenic concentrations were 0.013 and 0.024 mg/L in the Torrington groundwater and Jackson groundwater, respectively. The groundwater from Torrington contained concentrations of SO42- of 150 mg/L and Si concentrations of 0.026 mg/L. The groundwater from Jackson contained concentrations of SO42- of 15 mg/L and Si concentrations of 0.008 mg/L. The controlfilters alone showed no effect on removal of arsenic from Torrington and Jackson groundwater in the field. The concentration of arsenic in the Torrington groundwater with as-prepared CuO-NP was decreased from 0.013 to 0.002 mg/L in the composite sample. The pH of the Torrington groundwater prior to treatment was 7.22. A drop in pH was seen to a pH of 6.55 in the initial 0 minute sample following treatment. Following this initial drop the pH slowly increased to a pH of 7.35 in the composite sample. Except for arsenic, no other chemical constituent of the Torrington water changed significantly following the treatment with CuO-NP, including copper. In the Jackson groundwater, the concentration of arsenic was decreased from 0.024 to 0.002 mg/L. The pH of the Jackson groundwater was 7.50 prior to the treatment with point-of-use filter column. Again, an initial drop in pH to 6.58 was noted, which then increased to 7.40 in the composite sample. There was no significant change in chemical constituents other than arsenic of the Jackson groundwater following the treatment with CuO-NP as-prepared, including copper.The CuO-NP were regenerated in the field by raising the pH of the solution entering the point-of-use filter column above the ZPC (> pH 9.4±0.4) of CuO-NP, desorbing the arsenic from the CuO-NP into solution which was then flushed through the system. The experiments were then repeated with the regenerated CuO-NP. The regenerated CuO-NP were slightly less effective in removing arsenic, from Torrington and Jackson groundwater samples, than the CuO-NP as-prepared. Similar to observations in the lab based point-of-use filter experiment, this is due to an incomplete flushing of arsenic from the reaction column of the point-of-use filter during regeneration and subsequently an incomplete regeneration of the CuO-NP. Arsenic concentration in the Torrington groundwater decreased from 0.013 to 0.004 mg/L following the treatment with regenerated CuO-NP, and the Jackson groundwater decreased in arsenic concentration from 0.024 to 0.003 mg/L. The effects of the regenerated CuO-NP on other chemical constituents were similar to that of the CuO-NP as-prepared, with no significant changes observed. Arsenic contamination of human drinking water supplies is a serious global health concern. Despite multiple years of research, sustainable arsenic treatment technologies have yet to be developed. This study demonstrates intrinsic abilities of cupric oxide nanoparticles (CuO-NP) towards arsenic adsorption and development of a point-of-use filter for field application.Results of this study suggest naturally occurring arsenic in groundwater samples was effectively removed by both as-prepared and regenerated CuO-NP in the field usingthe point-of-use flow-through column filter.
Publications
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Progress 10/01/14 to 09/30/15
Outputs
Target Audience:Ag producers and In situ uranium mining industry Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided?Trained a graduate student and a research scientist. How have the results been disseminated to communities of interest?Results were presented at local, regional, and national meetings. What do you plan to do during the next reporting period to accomplish the goals?Continue working on project goals.
Impacts
What was accomplished under these goals?
Prepared cupric oxide (CuO) nanoparticles.X-ray diffraction and X-ray photoelectron spectroscopy experiments were used to examine adsorption, desorption, and readsorption of aqueous arsenite and arsenate by CuO-NP. Apoint -of-use flow-through filter column for lab and field testing was designed and developed.Experiments were conducted with a point-of-use filter, coupled with real-time arsenic monitoring, to remove arsenic from domestic groundwater samples. The CuO-NP were regenerated by desorbing arsenate via increasing pH above the zero point of charge. Results suggest naturally occurring arsenic was effectively removed by both as-prepared and regenerated CuO-NP in field demonstration of the point-of-use filter.
Publications
- Type:
Journal Articles
Status:
Published
Year Published:
2015
Citation:
McDonald, K.J., B.R. Reynolds, and K.J. Reddy. 2015. Intrinsic properties of cupric oxide nanoparticles enable effective filtration of arsenic from water. Scientific Reports. DOI:10.1038/srep11110.
- Type:
Journal Articles
Status:
Published
Year Published:
2015
Citation:
Schilz, J.R., K.J. Reddy, S. Nair, T.E. Johnson, R.B. Tjalkens, K.P. Krueger, and S. Clark. 2015. (Invited) Removal of trace elements by CuO nanoparticles from uranium in-situ recovery bleed water and its effect on cell viability. Journal of Visual Experimentation. E52715, DOI:10.3791/52715.
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Progress 10/01/13 to 09/30/14
Outputs
Target Audience:
Nothing Reported
Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided? A graduate student and research scientist were trained. How have the results been disseminated to communities of interest? Results were presented at local and regional meetings. What do you plan to do during the next reporting period to accomplish the goals? Try to accomplish objectives 4 and 5.
Impacts
What was accomplished under these goals?
Point-of-use filter column to remove arsenic from groundwater was developed. Three identical polycarbonate point-of-use filters were designed for lab and field testing. The basic design of the filter is derived from previouslab experiments. However, several key modifications were made to this column design to allow for it to be operated in the field at ten times the flow rate used in previous lab based studies. Contact time in the point-of-use filter of the CuO-NP and arsenic laden groundwater was approximately 2 min. Experiments were conducted on three different groundwater samples from Wyoming. For each groundwater sample, three tests were performed; one control (without CuO-NP) and two duplicate runs with CuO-NP. Following the initial treatment of arsenic laden water, the CuO-NP were regenerated in the lab and the field (see Methods). All regeneration wash fluids were collected at the outlet and fully characterized for anion and cation concentrations. After the regeneration process, the flow-through filtration process was repeated using the regenerated CuO-NP. The initial flow-through process using CuO-NP as-prepared, regeneration of the CuO-NP, and second flow through using regenerated CuO-NP were performed. Additionally, control runs with the respective groundwater samples were conducted without CuO-NP in order to determine the effect of the glass filters and sand alone in the point-of-use filter column. Results suggested an effective oxidation of arsenite to arsenate on the surface of CuO-NP. Naturally occurring arsenic was effectively removed by both as-prepared and regenerated CuO-NP in field demonstration of the point-of-use filter.
Publications
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Progress 09/30/13 to 09/30/13
Outputs
Target Audience:
Nothing Reported
Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided?
Nothing Reported
How have the results been disseminated to communities of interest?
Nothing Reported
What do you plan to do during the next reporting period to accomplish the goals?
Nothing Reported
Impacts
What was accomplished under these goals?
This is a new project.
Publications
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