scholarly journals A Sugarcane-Bagasse-Based Adsorbent Employed for Mitigating Eutrophication Threats and Producing Biodiesel Simultaneously

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 572 ◽  
Author(s):  
Basri ◽  
Daud ◽  
Lam ◽  
Cheng ◽  
Oh ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Sugarcane Bagasse ◽  
Acid Methyl Ester ◽  
Point Of Zero Charge ◽  
Medium Ph ◽  
Microalgal Biomass ◽  
Acid Methyl ◽  
Biochemical Compounds ◽  
Eutrophic Water ◽  
Fame Profile

Eutrophication is an inevitable phenomenon, and it has recently become an unabated threat. As a positive, the thriving microalgal biomass in eutrophic water is conventionally perceived to be loaded with myriad valuable biochemical compounds. Therefore, a sugarcane-bagasse-based adsorbent was proposed in this study to harvest the microalgal biomass for producing biodiesel. By activating the sugarcane-bagasse-based adsorbent with 1.5 M of H2SO4, a highest adsorption capacity of 108.9 ± 0.3 mg/g was attained. This was fundamentally due to the surface potential of the 1.5 M H2SO4 acid-modified sugarcane-bagasse-based adsorbent possessing the lowest surface positivity value as calculated from its point of zero charge. The adsorption capacity was then improved to 192.9 ± 0.1 mg/g by stepwise optimizing the adsorbent size to 6.7–8.0 mm, adsorption medium pH to 2–4, and adsorbent dosage to 0.4 g per 100 mL of adsorption medium. This resulted in 91.5% microalgae removal efficiency. Excellent-quality biodiesel was also obtained as reflected by the fatty acid methyl ester (FAME) profile, showing the dominant species of C16–C18 encompassing 71% of the overall FAMEs. The sustainability of harvesting microalgal biomass via an adsorption-enhanced flocculation processes was also evidenced by the potentiality to reuse the spent acid-modified adsorbent.

scholarly journals Adsorption properties of sugarcane bagasse and corn cob for the sulfamethoxazole removal in a fixed-bed column

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Diego Juela ◽  
Mayra Vera ◽  
Christian Cruzat ◽  
Ximena Alvarez ◽  
Eulalia Vanegas
Keyword(s):  
Adsorption Capacity ◽  
Sugarcane Bagasse ◽  
Fixed Bed ◽  
Good Alternative ◽  
Point Of Zero Charge ◽  
Diffusion Resistance ◽  
Corn Cob ◽  
Dispersed Particles ◽  
Natural Adsorbents ◽  
Boehm Titration

AbstractNatural adsorbents are a good alternative to remove antibiotic residues from wastewater. In this study, the adsorption capacity of sulfamethoxazole (SMX) onto sugarcane bagasse (SB) and corn cob (CC) in a continuous fixed-bed was compared. Brunauer Emmett Teller, Fourier transform infrared (FTIR), Boehm titration, and point of zero charge (pHpzc) were used to characterize both adsorbents. The adsorption capacity (qe) and the removal percentage of SMX (% R) were investigated at different different flow rates (2, 5, and 7 mL min− 1) and adsorbent masses (4 and 6.4 g), and a constant initial concentration of 5 mg L− 1. The results of the characterization showed that SB has a morphology with more dispersed particles and a specific surface higher than CC (2.6 > 1.2 m2 g− 1). Boehm titration indicates that both the surface of SB and CC have a greater amount of acid groups, which is in agreement with FTIR and pHpzc results. The continuous fixed-bed experiments showed that % R and qe of SMX are higher with SB in all the tests. The highest qe and maximum % R was 0.24 mg g− 1 and 74% with SB, and 0.15 mg g− 1 and 65% using CC. In most cases, the qe of both adsorbents decreased with the increase of flow rate and bed height. An analysis suggests that hydrogen bonds could be the main factor favoring the SMX adsorption with SB. Finally, the intraparticle diffusion was the rate-controlling step, predominating the pore-volume diffusion resistance.

Fatty acid methyl ester production from wet microalgal biomass by lipase-catalyzed direct transesterification

2016 ◽  
Vol 93 ◽  
pp. 6-12 ◽  
Author(s):  
Elvira Navarro López ◽  
Alfonso Robles Medina ◽  
Luis Esteban Cerdán ◽  
Pedro A. González Moreno ◽  
María D. Macías Sánchez ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Methyl Ester ◽  
Fatty Acid Methyl Ester ◽  
Acid Methyl Ester ◽  
Microalgal Biomass ◽  
Direct Transesterification ◽  
Acid Methyl

Adsorption of Direct Red 80 Dye from Solution by Sugarcane Bagasse and Modified Sugarcane Bagasse as Adsorbents

2016 ◽  
Vol 872 ◽  
pp. 175-180 ◽  
Author(s):  
Phatthraporn En-Oon ◽  
Ponsuparat Sansunon ◽  
Kowit Piyamongkala
Keyword(s):  
Adsorption Capacity ◽  
Sugarcane Bagasse ◽  
Adsorption Isotherms ◽  
Langmuir Isotherm ◽  
Adsorption Process ◽  
Experimental Results ◽  
Point Of Zero Charge ◽  
Batch Adsorption ◽  
Adsorption System ◽  
Initial Concentration

The sugarcane bagasse and modified sugarcane bagasse with 1.0 M H2SO4 were used as adsorbents for removal of the direct red 80 in batch adsorption process. The effect on the initial concentration of the direct red 80, at 215.8 - 1028.9 mg/L, was thoroughly investigated in batch adsorption system. It was fount that the point of zero charge of sugarcane bagasse and modified sugarcane bagasse were pH 4.9 and 2.0, respectively. The adsorption capacity increased with initial concentration of direct red 80. The experimental results showed that adsorption capacity onto 1.0 g of sugarcane bagasse and modified sugarcane bagasse for direct red 80 initial concentration 1,028.9 mg/L were 4.2 and 28.9 mg/g, respectively. The Langmuir and Freundlich adsorption isotherms were applied to describe the direct red 80 uptake, which could be described by Langmuir isotherm onto both adsorbents.

scholarly journals The Fatty Acid Methyl Ester (FAME) profile of Phytophthora agathidicida and its potential use as diagnostic tool.

2021 ◽  
Author(s):  
Randy F Lacey ◽  
Blake A Sullivan-Hill ◽  
Julie R Deslippe ◽  
Robert A Keyzers ◽  
Monica L Gerth
Keyword(s):  
Fatty Acid ◽  
Methyl Ester ◽  
Fatty Acid Methyl Ester ◽  
Diagnostic Tool ◽  
Fatty Acid Content ◽  
Acid Methyl Ester ◽  
Current Method ◽  
Fame Analysis ◽  
Acid Methyl ◽  
Fame Profile

Phytophthora diseases cause devastation to crops and native ecosystems worldwide. In New Zealand, Phytophthora agathidicida is threatening the survival of kauri, an endemic, culturally and ecologically important tree species. The current method for detecting P. agathidicida is a soil bating assay that is time-consuming and requires high levels of expertise to assess, thus limiting the analytical sample throughput. Here, we characterized the fatty acid methyl ester (FAME) profile of P. agathidicida. We also compared it with the FAME profile of P. cinnamomi and assessed the efficacy of FAME analysis as a diagnostic tool for detecting the pathogen in soil samples. In FAME analysis, the total fatty acid content is isolated from a sample and converted to FAMEs for analysis, a process that takes less than a day. Unique fatty acid acyl chains can serve as biomarkers for specific organisms. We detected 12 fatty acids in P. agathidicida, two of which (20:4ω6 and 20:5ω3) show promise as potential Phytophthora specific biomarkers. Collectively, these findings advance our fundamental understanding of P. agathidicida biology and provide a promising technique to increase the rate of sample processing and the speed of pathogen detection for P. agathidicida in soil.

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