Investigation of Impregnated Activated Carbon Properties Used in Hydrogen Sulfide Fine Removal

Isik-Gulsac, Isil

doi:10.1590/0104-6632.20160334s20150164

Cited by 32 publications

(19 citation statements)

References 31 publications

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“…Besides, the elements S can be seen also on the surface of CAC during adsorption and desorption process, respectively. A similar finding was obtained by by Isik-Gulsac [39], which stated that also had the components of H 2 S had occupied on the surface of adsorbents. This condition would affect the degradation of wt.% of carbon as shown in Table 9, due to the H 2 S gas had covered up on the CAC surface area which affected to drop the adsorbent capability.…”

Section: Resultssupporting

confidence: 87%

“…In addition, S elements also formed chemicals bonds by the presence of the functional group, such as sulfonate groups in FTIR analysis. Besides, the elements Ca represents in all adsorbents proved the mesoporous materials used are from activated carbon family [39]. However, the contents of impregnated compounds in each of adsorbents was found a small number of elements in terms of wt.%, where, referred to impregnation compounds.…”

Section: Resultsmentioning

confidence: 99%

“…The increase in the H 2 S adsorption capacity of the impregnated CACs was caused by the large surface area and porosity development. The presence of CO 2 gas in the outlet stream had decreased the H 2 S adsorption capacity due to the competition for both gases (CO 2 and H 2 S) on the raw CAC active site surface, which led to the limitation of H 2 S adsorption through the formation of high sulfur-valent components [39].…”

Section: Resultsmentioning

confidence: 99%

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Removal of hydrogen sulfide from a biogas mimic by using impregnated activated carbon adsorbent

et al. 2019

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Adsorption technology has led to the development of promising techniques to purify biogas, i.e., biomethane or biohydrogen. Such techniques mainly depend on the adsorbent ability and operating parameters. This research focused on adsorption technology for upgrading biogas technique by developing a novel adsorbent. The commercial coconut shell activated carbon (CAC) and two types of gases (H 2 S/N 2 and H 2 S/N 2 /CO 2 ) were used. CAC was modified by copper sulfate (CuSO 4 ), zinc acetate (ZnAc 2 ), potassium hydroxide (KOH), potassium iodide (KI), and sodium carbonate (Na 2 CO 3 ) on their surface to increase the selectivity of H 2 S removal. Commercial H 2 S adsorbents were soaked in 7 wt.% of impregnated solution for 30 min before drying at 120°C for 24 h. The synthesized adsorbent’s physical and chemical properties, including surface morphology, porosity, and structures, were characterized by SEM-EDX, FTIR, XRD, TGA, and BET analyses. For real applications, the modified adsorbents were used in a real-time 0.85 L single-column adsorber unit. The operating parameters for the H 2 S adsorption in the adsorber unit varied in L/D ratio (0.5–2.5) and feed flow rate (1.5–5.5 L/min) where, also equivalent with a gas hourly space velocity, GHSV (212.4–780.0 hour -1 ) used. The performances of H 2 S adsorption were then compared with those of the best adsorbent that can be used for further investigation. Characterization results revealed that the impregnated solution homogeneously covered the adsorbent surface, morphology, and properties (i.e., crystallinity and surface area). BET analysis further shows that the modified adsorbents surface area decreased by up to 96%. Hence, ZnAc 2 –CAC clarify as the best adsorption capacity ranging within 1.3–1.7 mg H 2 S/g, whereby the studied extended to adsorption-desorption cycle.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Removal of hydrogen sulfide from a biogas mimic by using impregnated activated carbon adsorbent

et al. 2019

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“…Furthermore, bulk analyses may not provide sufficient information about the distribution of nutrient elements at the microscopic and submicroscopic scale of plant-microbe-soil-interfaces at which the nutrient mobilization, -transport and -uptake take place. Electron microscopy with elemental detection is a powerful tool to get deeper insights into the composition of particles at this scale (e.g., [38][39][40][41]). Total elemental composition has been reported from electron microscopic investigations of BCs [24], but not the spatial distributions of elements.…”

Section: Introductionmentioning

confidence: 99%

Sulfur-Enriched Bone Char as Alternative P Fertilizer: Spectroscopic, Wet Chemical, and Yield Response Evaluation

et al. 2019

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Phosphorus- (P) rich bone char (BC) could be an alternative P fertilizer in sustainable agriculture; however, it has a low P solubility. Therefore, sulfur-enriched BC (BCplus) was tested for chemical composition and fertilization effects in a pot experiment. In BCplus sulfur, concentrations increased from <0.1% to 27% and pH decreased from 8.6 to 5.0. These modifications did not change P solubility in water, neutral ammonium citrate, and citric acid. A pot experiment with annual rye grass (Lolium multiflorum L.) and treatments without P (P0), BC, BCplus and triple superphosphate (TSP) was set up. The cumulative dry matter yield of the BC treatment was similar to P0, and that of BCplus similar to TSP. The plant P uptake was in the order P0 = BC < BCplus < TSP. Consequently, the apparent nutrient recovery efficiency differed significantly between BC (<3%), BCplus (10% to 15%), and TSP (>18%). The tested equilibrium extractions, regularly used to classify mineral P-fertilizers, failed to predict differences in plant yield and P uptake. Therefore, non-equilibrium extraction methods should be tested in combination with pot experiments. Additionally, particle-plant root scale analyses and long-term experiments are necessary to gain insights into fertilizer-plant interactions.

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“…From the FTIR results shown in Fig. 4, it was evident that CS 750 and PS-750 Starbons ® were almost identical and matched with that of commercially available activated carbon (AC) [16,17]. To confirm the presence of amines in the loaded Starbons ® , FTIR studies were conducted for three different samples of 10%, 20% and 30% MEA loaded Starbons ® .…”

Section: Physico-chemical Characterizationmentioning

confidence: 70%

Carbon capture using amine modified porous carbons derived from starch (Starbons®)

2019

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Adsorption based carbon capture to address the serious concern of global warming has been gaining worldwide attention of researchers due to its inherent advantages vis a vis other technical options like absorption, membrane and cryogenic separations, chemical looping combustion etc. Porous carbons from biomass wastes are under focus currently owing to its abundance, simple synthesis and regeneration and flexibility to achieve the desired pore structure and chemical modification. Carbon capture studies using porous carbons from starch have received little attention when compared to other biomass precursors. Hence in this work, facile synthesis of porous carbons from corn and potato starch has been employed. These were then screened w.r.t physico-chemical properties using different analytical tools like XRD, FTIR and BET surface area. Amine loading was done by wet impregnation method at different levels from 10 to 30% by wt to enhance their CC performance. Process standardization was done to maximize the CC capacity w.r.t critical process parameters like carbonation time, temperature, loading level, biomass precursor etc. A reasonably good CC of 3.4 mmol/g has been achieved at the optimal conditions. Cyclic stability and regenerability studies were also conducted to assess their stability and long term deployment potential. Amine loading was found to have a positive influence in achieving higher CC but at the cost of cyclic stability. From our studies, we could state that Starbons ® have a great potential to act as green sorbent in CC and the technology is in nascent stage, there is a huge window for innovation in synthesis, structure and chemical modification.

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Investigation of Impregnated Activated Carbon Properties Used in Hydrogen Sulfide Fine Removal

Cited by 32 publications

References 31 publications

Removal of hydrogen sulfide from a biogas mimic by using impregnated activated carbon adsorbent

Removal of hydrogen sulfide from a biogas mimic by using impregnated activated carbon adsorbent

Sulfur-Enriched Bone Char as Alternative P Fertilizer: Spectroscopic, Wet Chemical, and Yield Response Evaluation

Carbon capture using amine modified porous carbons derived from starch (Starbons®)

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