By which mechanism zinc chloride works as an activator in the preparation of activated carbon?

Activated carbon is prepared from lignocellulosic biomass using ZnCl2 as the activating agent. What is the possible reaction between zinc chloride and the biomass?

02 March 2018 9,452 4 View

How can I maintain pH of heavy metal solution using buffer?

For maintaing pH of heavy metal NaOH and HCl is added in a dropwise manner to the solution. But how can a buffer be used for maintaining the pH of the solution? Kindly give vivid explanation.

01 February 2018 8,247 4 View

Why is it not possible to maintain the concentration of Mohr's salt solution after adjusting the pH?

Suppose I have prepared initial concentration of 10ppm(100 ml). After maintaining pH (2-6) by 1M NaOH and 1M HCl , it's original concentration decreases to a great extent, so what can be the...

31 December 2017 9,670 3 View

Why is langmuir surface area always higher than BET surface area?

Langmuir corresponds to monolayer adsorption whereas BET denotes multilayer adsorption. So, what is the reason behind Langmuir surface area to be greater?

06 July 2017 2,428 8 View

What is the reason for the presence of a hysteresis loop in the Type I N2 adsorption-desorption isotherm?

The curve yielded the features of Type 1 isotherm but the adsorption capacity continues to increase with an increase in relative pressure. So is my assumption correct regarding the type of...

05 June 2017 2,012 8 View

Is it possible to get (-ve) lactonic and carboxylic acid groups from Boehm titration of ZnCl2 activated carbon?

The Boehm titration of ZnCl2 activated carbon indicated basic sites of 0.525 mmol/g and 0.85 mmol/g phenolic groups with -0.19 mmol/g and -0.26 mmol/g lactonic and carboxylic groups. The total...

05 June 2017 4,818 1 View

What should be the zero point charge value of base impregnated activated carbon?

04 May 2017 8,288 6 View

Can we use vacuum degassing method for expulsion of carbon dioxide in Boehm titration?

03 April 2017 590 1 View

Can zero point charge of activated carbon be determined by salt addition method ?

I want to determine the zero point charge of activated carbon. So which is the best suitable method for it and is it neccessary to degasify the solution while measuring the final pH in order to...

03 April 2017 8,672 3 View

How can I know whether a journal of Elsevier publication is Sci indexed or not ?

11 December 2016 9,893 4 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

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

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

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22 February 2021 9,932 11 View

Can anyone help or comment on solubilising chlorobutanol in aqueous injections in minimum time possible?

Please suggest solubilisation of chlorobutanol in injections. Tried pH and high temperature. But the issue is of assay drop. If anyone can suggest any solution. Its a commonly used excipient for...

21 February 2021 7,397 1 View

What reaction will occur when adding hexamine into ammonium nitrate in an acidic medium?

Hello, I am investigating properties of water in oil emulsion explosives. And adding hexamine (hexamethylenetetramine) into one of the phases that are used to make the emulsion should increase the...

21 February 2021 8,680 1 View

What properties of water shall be analyzed and evaluated to test the effectiveness of activated carbon?

I would like to ask what other properties of water (pH and such) shall be analyzed and evaluated to test the effectiveness of activated carbon from filtering the contaminants present in the water?

20 February 2021 9,422 8 View

Phenol-pH graphic?

We want to use phenol pH graphic to measure the pH of mediums before and after inhibitor application to cells. We have phenol absorbence values at 460, 560 and 720 nm wavelength. When we measure...

20 February 2021 7,700 3 View

In methylene blue test Why is UV absorbance reading very low as soon adsorbent is added and then increasing before reaching equilibrium?

Hello, I'm working on removal of methylene blue. 01. in the dark test very first reading is taken 15 minutes after adding adsorbent to the dye solution and that UV absorbance reading is very...

19 February 2021 472 5 View