The influence of physico-chemical properties of TiO2 on photocatalytic generation of C1–C3 hydrocarbons and hydrogen from aqueous solution of acetic acid

A herbicide, 3,4-Dichlorophenoxy acetic acid (34D) was successfully intercalated into the zinc layered hydroxide (ZLH) by direct reaction with zinc oxide (ZnO) to form a new organic-inorganic zinc layered hydroxide-3,4-Dichlorophenoxy acetate (Z34D) under an aqueous environment. The pH of the solution was adjusted to 7.5 using 2 M sodium hydroxide (NaOH). The pure phase and well-ordered was synthesized at 0.3 M Z34D. PXRD patterns show well-ordered nanohybrid material with basal spacing at 26.1 Å. The percentage loading of 34D in the Z34D is 57.5 % (w/w) calculated based on the percentage of carbon in the sample. FESEM shows the ZnO precursor has very fine granular structure and transformed into agglomerate structure when the nanohybrid are formed. This work shows that the nanohybrid of Z34D can be synthesized using simple, direct-reaction method.

Download Full-text

A reaction of glucose with peptides

Biochemical Journal ◽

10.1042/bj1290203 ◽

1972 ◽

Vol 129 (1) ◽

pp. 203-208 ◽

Cited By ~ 45

Author(s):

Henry B. F. Dixon

Keyword(s):

Aqueous Solution ◽

Acetic Acid ◽

Blood Glucose ◽

Dissociation Constant ◽

Electrophoretic Mobility ◽

Chemical Properties ◽

Amino Group ◽

Half Time ◽

N Terminus ◽

And Chemical Properties

Valylhistidine (Val-His) reacts with glucose (Glc) in a mixture of pyridine and acetic acid to form glucosylvalylhistidine (Glc-Val-His). The pK of the α-amino group is thereby lowered to about 5.6 as judged by electrophoretic mobility. The reaction: [Formula: see text] also occurs in an aqueous solution of pyridine and acetic acid of pH6.2 at 50°C, in which it exhibits a half-time of about 30h and a dissociation constant of about 0.3m. Isoleucyltyrosine and glucose react similarly in aqueous solution. The Glc-Val-His has the chromatographic, electrophoretic and chemical properties reported by Holmquist & Schroeder (1966a) for the substance released by proteolysis from the N-terminus of the β-chains of haemoglobin AIc; the value of the dissociation constant means that the concentration of haemoglobin AIc found naturally could be explained by reaction of haemoglobin A with the blood glucose.

Download Full-text

Impact of formic/acetic acid and ammonia pre-treatments on chemical structure and physico-chemical properties of Miscanthus x giganteus lignins

Polymer Degradation and Stability ◽

10.1016/j.polymdegradstab.2011.07.022 ◽

2011 ◽

Vol 96 (10) ◽

pp. 1761-1770 ◽

Cited By ~ 57

Author(s):

Caroline Vanderghem ◽

Aurore Richel ◽

Nicolas Jacquet ◽

Christophe Blecker ◽

Michel Paquot

Keyword(s):

Acetic Acid ◽

Chemical Structure ◽

Chemical Properties ◽

Miscanthus X Giganteus ◽

Physico Chemical

Download Full-text

ONE-POT-TWO-STEP SYNTHESIS OF BIOLUBRICANT BASE STOCK FROM RUBBER SEED OIL

Journal of Chemical Society of Nigeria ◽

10.46602/jcsn.v45i5.533 ◽

2020 ◽

Vol 45 (5) ◽

Author(s):

G.O . Madojemu ◽

E.A. Elimian ◽

M.C. Ejimadu ◽

C.O. Okieimen ◽

F.E. Okieimen

Keyword(s):

Hydrogen Peroxide ◽

Acetic Acid ◽

Response Surface ◽

Seed Oil ◽

Chemical Properties ◽

Base Stock ◽

One Pot ◽

Rubber Seed Oil ◽

Rubber Seed ◽

Physico Chemical

Biolubricant base stock was synthesized in this work from rubber seed oil in a one-pot-two-step process of epoxidation and hydroxylation. Rubber seed oil was extracted using a Soxhlet apparatus. The in situ epoxidation of the rubber seed oil with peracid (hydrogen peroxide and acetic acid) was analysed and optimized considering three process variables with their range of values given as temperature of 35-50 , time of 60-180 mins and mole ratio of hydrogen peroxide to acetic acid of 1:0.25-1:1 by applying the central composite design of response surface methodology. The ring opening reaction (hydroxylation) of the epoxide to polyhydroxylated oil (lubricant basestock) with ethanol was carried out using the optimum conditions obtained from the epoxidation process. The rubber seed oil, epoxide and lubricant basestock were characterized in terms of physico-chemical properties using standard methods and in terms of functional groups using Fourier Transform Infrared (FTIR) spectroscopy. Maximum epoxide content of 4.85% and maximum conversion of 71% of rubber seed oil to epoxide was achieved at a temperature of 50􀀀 , reaction time of 180 mins and 1: 0.39 mol/mol of hydrogen peroxide to acetic acid. The predicted values of the epoxidation process reasonably agreed with the experimental ones and model R-squared value of about 95% showed that response surface method can reasonably predict the epoxidation process using a quadratic polynomial model. There was 75% conversion of the epoxide to polyhydroxylated oil (biolubricant basestock), which represents a very high yield. The formation of epoxides and polyhydroxylated oil lead to modification (improvement) in the properties of rubber seed oil as confirmed by the physico-chemical properties and FTIR spectra analysis of the oil, epoxide and lubricant basestock. The study showed that chemical derivatives of rubber seed oils are an attractive, renewable, and ecofriendly alternative to mineral oils for lubricant formulations.

Download Full-text

Physico-chemical properties of Chitosan films

Open Chemistry ◽

10.2478/bf02482727 ◽

2004 ◽

Vol 2 (4) ◽

pp. 638-647 ◽

Cited By ~ 23

Author(s):

Luminita Balau ◽

Gabriela Lisa ◽

M. Popa ◽

V. Tura ◽

V. Melnig

Keyword(s):

Acetic Acid ◽

Chemical Properties ◽

X Ray Diffraction ◽

Structural Investigations ◽

Physico Chemical ◽

Thermal Investigations ◽

Fourier Transform Ir ◽

Diffraction Peaks ◽

Chitosan Films ◽

Two Stages

AbstractChitosan films obtained by dry phase inversion were prepared from an aqueous solution of chitosan in acetic acid. The films, of thickness less than 20 μm, were transparent, very flexible and had smooth surfaces. Increasing the film thickness induced an increase of the internal tensions and the consequent formation of a rough surface. Structural investigations by X-ray diffraction and Fourier transform IR analysis, showed that the chitosan films, as prepared, are amorphous. Further annealing to evaporate acetic acid and water traces, changed the amorphous phase into a more ordered phase, characterized by diffraction peaks at 2θ values of 9, 17, 20 and 23 degrees. Thermal investigations by TG, DTG, and DTA revealed that the decomposition of the chitosan films as prepared proceeds in two stages, starting from 180°C and 540°C.

Download Full-text