The photocatalytic hydrogen production experiment under visible light irradiation was conducted in a Pyrex top–irradiation reaction vessel. A 300 W xenon lamp (CEL-HXF300, perfectlight, Beijing) was used as the light source. A 420 nm cutoff filter was chosen as the visible light source. The catalyst was mixed with a H2PtCl6 aqueous solution for ultraviolet radiation treatment to provide supporting platinum on the catalyst as an auxiliary catalyst. Then, 50 mg of the photocatalyst was dispersed in 100 mL of ultrapure water along with a sacrificial agent (i.e., 10 mL of triethanolamine). Nitrogen was pumped into the reactor for 30 min to remove the dissolved oxygen prior to the experiment. During the entire reaction process, the temperature of the reaction system was maintained at 5 °C by the flow of cooling water. 1 mL of gas was collected and injected for gas chromatography analysis (Techcomp GC7900, equipped with a TCD and 5 Å molecular sieve columns). The AQY was calculated according to the following formula: AQY (%) = number of evolved H2 molecules × 2 × 100/number of incident photons.
Gc7900
Manufactured by Techcomp
Sourced in China
The GC7900 is a gas chromatograph designed for laboratory use. It is capable of separating and analyzing complex mixtures of volatile organic compounds. The GC7900 is equipped with a thermal conductivity detector (TCD) for detecting and quantifying the separated components. This device is intended for analytical applications that require the separation and identification of chemical substances.
Automatically generated - may contain errors
Lab products found in correlation
Tdx 01, by Techcomp (2 mentions)
Db 1701 column, by Agilent Technologies (1 mentions)
Uv 560, by Jasco (1 mentions)
Agilent 7890a, by Agilent Technologies (1 mentions)
Nano zs90, by Malvern Panalytical (1 mentions)
Toc l cph, by Shimadzu (1 mentions)
Agilent 7890a 5975c gc ms, by Agilent Technologies (1 mentions)
Evoq gc tq, by Bruker (1 mentions)
Ultimate 3000 hplc, by Thermo Fisher Scientific (1 mentions)
α pinene, by Merck Group (1 mentions)
29 protocols using gc7900
1
Photocatalytic Hydrogen Production
2
Oxidative Dehydrogenation Reaction Catalysts
Check if the same lab product or an alternative is used in the 5 most similar protocols
+ Expand
The oxidative dehydrogenation (ODH) reaction tests were performed in a continuous flow packed-bed quartz tube (i.d.= 9 mm, 420 mm in length) under atmospheric pressure (0.1 MPa). Catalyst (BN: 100 mg, V–Al2O3: 40 mg, Li–MgO: 100 mg) with 80–100 mesh was placed in the constant temperature zone of a reactor. The feed gases including CH4 (99.9%), C2H6 (99.9%), C2H4 (99.9%), C3H8 (99.9%), C3H6 (99.9%), O2 (99.99%), and N2 (99.999%) were controlled separately by mass flow controllers to vary total flows and partial pressures of the reactants. The reaction temperature was controlled by a thermocouple placed at the inner center of the catalyst bed. Before evaluation of the catalytic activity, BN, V–Al2O3, and Li–MgO were pretreated for 3 h under reaction atmosphere (Ftotal = 40 mL min−1, C3H8:O2:N2 = 8:8:24) at 550 °C, 500 °C, and 600 °C, respectively. Reactants and products were analyzed by an on-line gas chromatograph (Techcomp, GC 7900). AGDX-102 and 5 A molecular sieve columns, connected to a TCD were used to analyze alkane conversion and products selectivity, which were calculated according to equations as follows. Carbon balances were always within the range of 100 ± 5%.
3
Photocatalytic Hydrogen Production
Check if the same lab product or an alternative is used in the 5 most similar protocols
+ Expand
A 300 W Xe irradiation lamp was placed on the top of the photocatalytic hydrogen production reactor, which was connected to the Labsolar-III (AG) system. In a general test, 0.1 g of the heterostructured composite catalysts was added to the solution, with methanol serving as the sacrificial agent. The irradiation started to work after the air in the system was thoroughly eliminated. An online gas chromatograph (GC7900, Techcomp, Beijing, China) was used to periodically analyze the hydrogen generated from the photocatalytic reaction. The stability of the photocatalyst was checked throughout the experiment cycle. Following the same steps, it was tested 5 times under visible light. Before the reaction started, the system was evacuated and purified with nitrogen to make sure that there was no H2 or O2.
4
Photocatalytic CO2 Reduction Procedure
Check if the same lab product or an alternative is used in the 5 most similar protocols
+ Expand
Photocatalytic CO2 reduction was conducted in a 100 mL quartz cell reactor equipped with a 300 W xenon lamp (PLSSXE300UV, PerfectLight, Beijing, China) as the light source. In detail, 10 mg of the photocatalyst and 10 mL of deionized water were added to the 100 mL quartz cell reactor. High-purity CO2 gas (99.9%) was passed through the water and then into the reaction setup to reach an ambient pressure. The photocatalysts were allowed to equilibrate in the CO2/H2O system for 20 min under stirring, and were then irradiated with the 300 W xenon lamp. The amounts of CO and CH4 that evolved were determined using a gas chromatograph (Techcomp GC-7900, Shanghai, China) equipped with both TCD and FID detectors. The production rates of CO and CH4 were calculated according to the standard curve.
5
Photocatalytic H2 Production from AgInS2-xAg2S-yZnS-zIn6S7
Check if the same lab product or an alternative is used in the 5 most similar protocols
+ Expand
The photocatalytic activity of the as-synthesized AgInS2-xAg2S-yZnS-zIn6S7 nanocomposites was evaluated by the photocatalytic reduction of water to produce H2 under simulated sunlight irradiation. The H2 evolution test was performed on a LabSolar-III AG reaction cell (Beijing Perfect Light Company, Beijing, China). In a typical experiment, 20 mg of AgInS2-xAg2S-yZnS-zIn6S7 nanoparticles were dispersed in an 60 mL of aqueous solution containing 2.6 g of Na2SO3 (0.33 mol∙L−1), 3.6 g of Na2S (0.74 mol∙L−1) as sacrificial reagents and 5 mL of 1 mg/mL Pt(NH4)2Cl6 as promoter. The aqueous solution was irradiated by a 300 W Xe arc lamp (PLS-SEX300/300UV, Beijing Perfect Light Company) to produce H2. The yield of H2 was determined with an on-line gas chromatograph (GC7900, Techcomp, Shanghai, China), which equipped with a molecular sieve 5A column and a thermal conductivity detector. N2 was used as the carrier gas.
6
Encapsulation of Carvacrol in CD/MOF-X
Check if the same lab product or an alternative is used in the 5 most similar protocols
+ Expand
CA was encapsulated in CD/MOF-X by the soaking method (Surendhiran et al., 2022 (link)). Briefly, a total of 50.0 mg of CD/MOF-X was dispersed into 0.5 mL of CA over a period of 12 h with oscillation. The resultant crystals were washed twice with absolute ethanol to remove residual CA, and the CA-loaded samples vacuum dried for 3 h at 38 oC. CA loading capacity was then measured by gas chromatography (GC) using a GC-7900 (Techcomp, USA) (Hu et al., 2021 (link)). GC was conducted through a DB-1701 column (30 m × 320 μm × 1 μm, Agilent) with a flame ionization detector at an inlet temperature of 280 oC. The column temperature started at 100 oC for 1 min and increased to 250 oC at a rate of 30 oC/min and then held constant for 1 min. 10.0 mg of the CA-loaded samples were fully dissolved into 1.0 mL distilled water with continuous ultrasonic mixing for 30 min, and subsequently treated with 4.0 mL ethyl acetate for the extraction of CA. The supernatants were collected for further GC analysis and the amount of extracted CA was calculated from a standard curve. Loading percentage was then determined from the formula:
7
Analytical Methods for Microbial Growth and Metabolite Quantification
Check if the same lab product or an alternative is used in the 5 most similar protocols
+ Expand
OD660 was assayed at 660 nm using the spectrophotometer (UV-560, JASCO, Japan). The concentrations of nitrate and nitrite were determined according to the standard methods (Zhang et al. 2015 (link)). Cobalt(II) concentration was determined by spectrophotometry (UV-560, JASCO, Japan) according to the method used by Long et al. (2017 (link)). Biomass growth was quantified by measuring the bacterial protein concentration in the reaction system according to the Bradford procedure (Bradford 1976 (link)). Fe(II) concentration was determined according to the method used by Dong et al. (2013 (link)). The dissolved oxygen was measured by dissolved oxygen analyzer (Rex JPBJ-608, Shanghai INESA, China). A pH meter (EL20, Shanghai Mettler-Toledo, China) was used to measure pH values. Gas samples were determined by a gas chromatography (GC7900, Techcomp, China) equipped with a thermal conductivity detector, a Porapak Q and a Molecular Sieve column. Helium was used as the carrier gas with a flow of 30 mL/min. The temperatures were 50 °C for the column, 120 °C for the detector and 120 °C for the injection port.
8
Photocatalytic Hydrogen Evolution Kinetics
Check if the same lab product or an alternative is used in the 5 most similar protocols
+ Expand
To investigate the photocatalytic activity for hydrogen evolution, gas–solid static experiments using the same setup were conducted in consideration of poor solubility of methane in water. In short, 20 mg of photocatalyst was strewed in a glass dish, which was placed in a water bath of 25 mL deionized water, then the reactor was evacuated by a calibrated gas mixture of 10% methane in nitrogen and sealed with rubber septum. After illumination for 2 h, the amount of hydrogen was determined by a Techcomp GC7890II gas chromatographer with a Molecular Sieve 5A 80/100 Mesh column and a thermal conductivity detector. Other gas phase products and the liquid composition were analyzed by a Techcomp GC7900 gas chromatographer with TDX-01, TM-Al2O3/S and SE-54 columns, and flame ionization detectors.
9
Photocatalytic Hydrogen Production from Water
Check if the same lab product or an alternative is used in the 5 most similar protocols
+ Expand
Photocatalytic H2 evolution was performed in a LabSolar H2 photocatalytic hydrogen evolution system (Perfectlight, China). A MICROSOLAR300 Xe lamp with an UV-cutoff filter (λ > 400 nm) was utilized as the visible light source. 50 mg of photocatalyst was added to an aqueous solution that contained 90 mL of water and 10 mL of triethanolamine. 1 wt% of Pt nanoparticles as cocatalyst were loaded onto the surface of the photocatalyst by in situ photodeposition using H2PtCl6·6H2O as the precursor. The reaction temperature was maintained at 5 °C and the reactor was irradiated with the Xe lamp under magnetic stirring. A gas chromatograph (GC7900, Techcomp, Shanghai) with a TCD detector was connected to the closed reaction system to determine the H2 evolution online. To investigate the stability of the photocatalyst, the photocatalytic process was cycled after the closed gas circulation system was evacuated regularly each 4 h. The photo intensity was determined by an optical power meter and the irradiation area was 19.6 cm2. The apparent quantum efficiency (AQE) was calculated based on the following equation:![]()
10
Determining Phase Composition and Salt Content
Check if the same lab product or an alternative is used in the 5 most similar protocols
+ Expand
Gas chromatography was used to determine the phase composition of the equilibrium system. The gas chromatograph (Techcomp GC7900, China) is equipped with a 2 m(L) × 3 mm(ID) × 5 mm(OD) Porapak Q 80–100 mesh packed column with a carrier gas (H2) flow rate of 30 mL/min and a thermal conductivity detector (TCD). All the samples were measured twice and then averaged to ensure the accuracy of the experimental results.
The salt content in the organic phase is determined by FAAS at the wavelength of 766.5 nm, and the detection method is an external standard method. A nitric acid (1:1, V/V with water) aqueous solution and a 10 g/L cesium nitrate solution were added to the samples for pretreatment [42 , 43 ]. All samples were measured twice to get the average value. The salt concentrations of the aqueous phase were computed by difference.
The salt content in the organic phase is determined by FAAS at the wavelength of 766.5 nm, and the detection method is an external standard method. A nitric acid (1:1, V/V with water) aqueous solution and a 10 g/L cesium nitrate solution were added to the samples for pretreatment [42 , 43 ]. All samples were measured twice to get the average value. The salt concentrations of the aqueous phase were computed by difference.
About PubCompare
Our mission is to provide scientists with the largest repository of trustworthy protocols and intelligent analytical tools, thereby offering them extensive information to design robust protocols aimed at minimizing the risk of failures.
We believe that the most crucial aspect is to grant scientists access to a wide range of reliable sources and new useful tools that surpass human capabilities.
However, we trust in allowing scientists to determine how to construct their own protocols based on this information, as they are the experts in their field.
Ready to get started?
Sign up for free.
Registration takes 20 seconds.
Available from any computer
No download required
Revolutionizing how scientists
search and build protocols!