Why do pH decrease and ORP increase during the reduction of nitrate using green synthesized nano zero valent iron (nZVI)?

More Darwin Mojica's questions See All

Significant different of green synthesized vs chemical synthesized nano-scale zero valent iron (nZVI)?

Please give differences in terms of characterization of particles and mechanism, reaction, products when it is used in treating contaminated water (like treatment for NO3, etc.). Cite or mention...

04 May 2019 8,169 2 View

I need a help in designing a horizontal pressure leaf filter. Can I ask some advice and learning materials for me to be able to design it properly?

I'm going to filter Sodium silicate solution with some solids.

09 October 2018 3,239 0 View

What statistical treatment should I use to determine the relationship between my independent variable (1) and my dependent variables (3)?

We conducted a study to reduce nitrate using G-nZVI, amount of nitrate (residual nitrate) was measured together with the amount of ammonia generated, pH, and ORP.

09 October 2018 3,545 3 View

What method/test shall I conduct to determine if Fe(II) and Cu(II) was reduced to Fe(0) and Cu(0)?

We're currently working in synthesizing Nano Scale Zero Valent Fe/Cu using green method. A plant extract was used as a reducing agent.

09 October 2018 2,175 3 View

What method/test shall I conduct to determine if Fe(II) and Cu(II) was reduced to Fe(0) and Cu(0)?

We're currently working in synthesizing Nano Scale Zero Valent Fe/Cu using green method. A plant extract was used as a reducing agent.

09 October 2018 9,403 6 View

What does it mean to have a negative concentration?

After getting a linear trend using the absorbance i get from different concentration of gallic acid, i use it to determine the concentration of extract i have using its absorbance but i get...

09 October 2018 2,675 0 View

Does the pressure(-600 mmHg) affects pH?

When I conducted the degassing experiment using decompression under anaerobic condition(and I used ferrous based chelating agent), the oxidized ferric were observerd. So, could you tell me the...

03 March 2021 4,892 5 View

What is Nano technology with coronavirus helpe the human..and is it nano mterals removal of covid19?

I anwar by adsorption or reaction ..but it is either more method...

02 March 2021 4,811 2 View

How to compare different concentrations of nanoparticles for characterization from ICP-MS?

I took measurements of different concentrations of 15 nm and 5 nm Au nano particle solutions. I'm trying to determine which concentration I measured gives the best reading overall. I also...

02 March 2021 7,626 1 View

Which transition metal salt precursor is best for doping? Why?

I would like to synthesize a transition metal doped TiO2 via solgel method. Hence, I would like to know which metal salt precursor to choose among Chloride, Nitrate, and Sulphate. A clear...

27 February 2021 4,285 3 View

Which database would give me this list of chemical components?

Dear colleagues: I would like to know if anyone knows of a database that gives me the parameters pH, K, K, Mg, P, C, N, Zn, Cu, Ni and Cd of common foods. I find a lot of information of proteins,...

26 February 2021 5,525 3 View

LEDs on Vis Light photo degradation of MB water sol via N doped TiO2 in a mini flume?

Good day to all, I have no experience with light emitting diodes. I am building a glass mini flume to demonstrate the photo degradation of Methylene Blue in water running over self cleaning...

26 February 2021 4,026 5 View

Zno nano particles colour changed from white to grey in process of calcination any suggestions?

In the formation of Zno nano particles process, after drying at 120 degree C, my zno nano particles are completely white but when i calcine it for 450 degree C it converts into grey colour. i...

26 February 2021 2,435 4 View

What is the best solvent to remove PDMS from nano particles?

I want to remove PDMS oligomers from the surface of nanolayers. I have just read a very helpful paper about the compatibility of PDMS with different solvents( Solvent Compatibility of...

24 February 2021 7,845 5 View

Why is NH4OH added in heavy metals limit test?

The limit test I'm referring to is USP method II. In this procedure you need to dropwise add 6N of NH4OH to the sample until it the pH is alkali. After that you need to dilute and add HOAc until...

23 February 2021 2,049 3 View

Is there an ideal incubation time of RGO-modified SPCE before subsequent use, i.e., electrochemical characterization or further modification?

I notice that upon washing and air-drying of my RGO/SPCE surface and characterizing again via DPV, the current response towards ferricyanide probe significantly decreases. My worry is that the...

22 February 2021 5,324 3 View

Yuri Mirgorod

The reducing agents contained in the plants are too weak to reduce Fe3 + to zero valence iron. When you add the aqueous extract to the iron nitrate, the hydrolysis reaction occurs

Fe3+ HOH = FeOH 2+ H+

and the pH increases.

Alexander Pud

As follows from the review (Article A review of nitrate reduction using inorganic materials

) pH should increase. So if you have instead pH decreased it can be connected with your system. Then in accord with the Nernst equation if pH decreases ORP should grow

Darwin Mojica

Sir Alexander Pud but my experiment showed that the Nitrate was reduced throughout the process. I think it's because of the green extract that I used to synthesized my particles.