Skip to main content

PROSPECTS ON PHOTOBIOREFINERY

Very recently, Prof. Dr. K. Faungnawakij and his research group have summarized a mini review report on an emerging renewable technique of Photobiorefinery. This is one of the beyond technique of Artificial Photosynthesis (AP) [1].

Despite great promises, AP technologies for solar H2 production and CO2 reduction are far uncompetitive to other promising technologies at the current stage.

However, despite an enormous effort, time, and budget paid on AP-related researches throughout several decades, AP technologies have struggled to strive beyond laboratory demonstration except a very few exceptions [2]. This bitter reality makes the translation of this excellent science to practical application questionable [3].

Technoeconomic analysis shows that without achieving the aggressive technology targets, this technology will not be commercially viable. This has directed the research community towards the development of highly efficient yet expensive devices.

While tremendous progress has been demonstrated, the poor profitability prospect originating from low profit margins, high energy requirement, and impractical engineering remains unaddressed. It is time to step back and redefine the alternative targets which are closer to profitable investment, rather than a specific locking-in technology with insignificant returns.

Recently, photocatalytic biorefinery, herein defined as photobiorefinery, has emerged as a promising approach to apply the recently-advanced AP knowledge for near practical or industrial applications.

Biorefinery, an analog to petroleum refinery, is the processing of biomass into a multitude of commercializable bio-based chemicals, materials, fuels and energy [4].

Photobiorefinery has emerged as one of the most promising approaches to apply the AP knowledge for near practical industrial applications.

Figure 1. Photobiorefinery concept for the conversion of biomass to sustainable chemicals. Starting with plants, the lignocellulosic biomass (lignin, cellulose, and hemicellulose) and triglyceride are obtained as raw materials for photocatalytic conversion to produce renewable chemicals and fuels. The chemicals can be recycled or undergone combustion or decomposition processes to CO2. The CO2 can be utilized directly via artificial photosynthesis (AP) or returned to plants via natural photosynthesis [1].

If we could use the ubiquitous sunlight to convert this renewable resource into fuels or value-added chemicals and reduce the biomass waste burnt and greenhouse gases, the energy and environmental problems could be simultaneously solved, similar to the ultimate goals of AP. The concept of photobiorefinery depicted in Figure 1 shows that the typical feedstocks for this process consist of lignocellulosic biomass (lignin, cellulose, and hemicellulose) and triglyceride. Lignin can be converted to valuable aromatic compounds.

 The Following Merits of Photobiorefinery:

Photobiorefinery requires much less activation energy than photocatalytic water splitting even though both processes are endergonic (ΔGRT>0) [5].

The oxidation potential of biomass and its derivatives is −0.2–0.26 V vs reversible hydrogen electrode (RHE), much more facile compared to 1.23 V vs RHE of water oxidation [6].

Thus, biomass and its derivatives can serve as scavengers for low energy photogenerated holes, reducing the overall potential requirement for solar H2 production or CO2 reduction, and producing valuable chemicals simultaneously [7].

Under the same reaction condition, photobiorefinery generally has higher quantum yield (QY) compared to the classical AP approach.

The greatest challenge lies in the mechanistic understanding of this complex chemistry and overcoming the slow kinetics. Using model molecules and utilizing systematic investigations similar to the approach inspired from CO2 reduction literature, as well as establishing a standardized protocol similar to those done in solar water splitting field likely accelerate the progress in photocatalytic biomass valorization towards commercialization.

References

[1]. T. Butburee, P. Chakthranont, C. Phawa, K. Faungnawakij, ChemCatChem 2020, 12, 1873–1890

[2]. Y. Goto, T. Hisatomi, Q. Wang, T. Higashi, K. Ishikiriyama, T. Maeda, Y. Sakata, S. Okunaka, H. Tokudome, M. Katayama, S. Akiyama, H. Nishiyama, Y. Inoue, T. Takewaki, T. Setoyama, T. Minegishi, T. Takata, T. Yamada, K. Domen, Joule 2018, 2, 509.

[3]. M. Antonietti, A. Savateev, Chem. Rec. 2018, 18, 969.

[4]. E. de Jong, A. Higson, P. Walsh, M. Wellisch, IEA Bioenergy, Task42 Biorefinery 2012, 34.

[5]. T. P. A. Ruberu, N. C. Nelson, I. I. Slowing, J. Vela, J. Phy. Chem. Lett. 2012, 3, 2798.

[6]. Z. Wu, J. Wang, Z. Zhou, G. Zhao, J. Mater. Chem. A 2017, 5, 12407.

[7]. X. Lu, S. Xie, H. Yang, Y. Tong, H. Ji, Chem. Soc. Rev. 2014, 43, 7581.

 Blog Written By

Dr. A. S. GANESHRAJA

National College

Thiruchirappalli, Tamilnadu, India

Contact Us click here

 

 

Labels:

Comments

Post a Comment

Popular posts from this blog

Electro-Organic Synthesis: Next Emerging Technique

Industrial developments, excessive energy consumption, sustainable technologies, environmental cleaning processes are major topics of political and social discourse. Current innovations are rated not only focusing on their benefit and utility but also concerning their eco-friendly approaches. The development of green technological processes is becoming more important and requires harmless energy sources. Particularly over the past decade, the severe limitations of fossil resources intensify the movement towards sustainable synthesis techniques with a strict cutback in the ecological footprint [ 1 ]. Electro-organic synthesis belongs to the synthetic organic chemistry discipline that facilities the direct use of electricity to generate valuable compounds. Hence, it is possible to transfer green aspects of sustainable energy sources to the whole production process [ 2 ]. Since the Kolbe’s discoveries of using electricity as a reagent for organic transformations over 170 years ago, ...
Post a Comment
Read more

Designing of Corrosion Resistant Alloys via Percolation Theory

Canada and USA Scientists have reported on designing of corrosion-resistant alloys via percolation theory and published in Nature Materials on 01 February 2021. Nickel–chromium, Iron–chromium binary alloys can serve as the prototypical corrosion-resistant metals owing to its presence of a nanometre-thick protective passive oxide film. The main key criterion for good passive behavior is the passive film should be compromised via a scratch or abrasive wear that can be reformed with a little metal dissolution. This could be a principal reason for the stainless steels and other chromium containing alloys that are used for critical applications which ranges from nuclear reactor components to biomedical implants. A long-standing unanswered question in corrosion science is the unravelling of the compositional dependence of the electrochemical behavior of the alloys [ 1, 2 ]. The discovery of the family of these alloys were increased its rate with the advent of artificial intelligence, da...
Post a Comment
Read more

Novel Approach of Plastic Waste to Flash Graphene

Prof. Algozeeb and his research collaboration team have investigated an novel approach of upcycling plastic waste (PW) products to flash graphene (FG). This method relies on Flash Joule Heating (FJH) to convert PW into FG. A sequential direct current (DC) and alternating current (AC) flash is used in order to make a high-quality graphene. In this FJH process, they established without catalyst and works for PW mixtures that can make the process suitable for handling landfill PW.  In 21 st century, PW pollution is considerable one among the various environmental issues. A very large fraction of PW ends up in the ocean, which leads to the formation of micro- and nanoplastics that threaten marine life, micro-organisms, useful bacteria, and humans. From the intense carbon footprint process, most of these synthesized plastics are used only once before dumping into landfills or water ways that terminate in the oceans. Hence, upcycling PW to higher value materials and chemicals is econ...
Post a Comment
Read more

Electric Vehicle: Public Health and Climate Benefits

A research team led by Daniel Peters at Northwestern University has investigated that if we introducing electrifying vehicles in the streets of the United States could annually prevent hundreds-to-thousands of premature accidental deaths.This work highlights the potential of a synergistic solution to reduce CO 2 emissions by hundreds to millions of tons annually. The estimate of economic damages induced by introducing electrifying vehicles (EV) adoption is substantial. With current infrastructure, about 25% of electrifying vehicles adoption in the US can save approximately $16.8 billion annually, has been told in the study entitled"Public Health and Climate Benefits and Trade offs of U.S. Vehicle Electrification," in GeoHealth on 13 th August 2020 [1] .  Vehicle electrification in the United States could prevent hundreds to thousands of premature deaths annually while reducing carbon emissions by hundreds of millions of tons. This highlights the potential of co-beneficial...
2 comments
Read more

AN ACT OF FACE MASK MATERIAL USED TO PROTECT US FROM SARS-COV-2

“ In the absence of a vaccine, or effective antiviral, one of our only remaining strategies for controlling COVID-19 is to physically block the spread of SARS-CoV-2 in the community ” On 11 March 2020, the World Health Organization (WHO) declared the COVID-19 outbreak a global pandemic [1] . In the absence of a vaccine, or effective antiviral, one of our only remaining strategies for controlling COVID-19 is to physically block the spread of SARS-CoV-2 in the community. Given that COVID-19 is a respiratory illness, the most effective physical defense likely involves widespread public use of face coverings, in conjunction with other control measures [ 2 ] . Face coverings (also variously referred to as face masks, nonmedical masks, community masks or barrier masks ) function primarily in source control; capturing droplets expelled by an infected individual [3] . Figure 1. DIY masks to protect against from viruses sounds like a crazy idea. source click here In the absence of an...
Post a Comment
Read more

Electromagnetic Field: Non-Chemical Water Treatment Technology

An interesting review report on “A critical review of the application of electromagnetic fields for scaling control in water systems: mechanisms, characterization, and operation” was reported by Lu Lin, Wenbin Jiang, Xuesong Xu and Pei Xu published in Nature Partner Journals Clean Water published on June 2020 [1] .   Water is the precious matter in the world. source U.S. General Services Administration has interested on non-chemical water treatment technologies. It has mentioned following important points: n on-chemical technology promises to increase the period between required blow-down cycles, thus reducing water consumption , minimizes associated issues of chemical storage, handling, and disposal, and may permit on-site re-use of cooling-tower “blow-down” water as “grey water” , it promises to be life cycle cost effective based solely on the reduction in chemical costs , this technology may reduce or eliminate chemical costs, it may not reduce other contractor costs ...
Post a Comment
Read more

A Novel Green Synthesis of Au/TiO2 Nanocomposites

Prof. Lahiru A. Wijenayaka, Sri Lanka Institute of Nanotechnology (SLINTEC), Mahenwatte, Pitipana, Homagama, Sri Lanka and his collaboration team has reported on the interesting materials for effective environmental alternative remediation via nontoxic, low cost and eco-friendly methods dedicated to the scientific community. Here, a novel, facile, and green synthetic approach to synthesize gold nanoparticle decorated over TiO 2 (Au/TiO 2 ) nanocomposites for sustainable environmental development has been discussed [ 1 ] . Based on various metal oxide semiconductor (MOS) photocatalysts, titanium dioxide (TiO 2 ) is the most widely used, owing to its effective and excellent results in optical transmittance, high refractive index, chemical stability, concurrently being stable, nontoxic, and inexpensive [ 2 ]. They are highlighted with the following points: (i) Synthesis of the Au/TiO 2 nanocomposite, (ii) Microscopic characterization, (iii) Dye adsorption on Au/TiO 2 and (iv) Photoca...
Post a Comment
Read more

Postdocs Crisis: The "Last Generation" of Scientists

Postdoctoral Researchers play a vital role in the research productivity of several countries and serving as leaders, mentors, guides, teachers, and scientists. These researchers have developed their own skills and preparing themself for their scientific research careers with various research groups worldwide. Even performing in a short term, they need to spend additional years in some special cases for succession in their research careers. Senior research investigators or leaders who have promised to their younger colleagues or students for a long term contract in the academics should find a new pathway to make it possible to stay and plan for their long-term career. Also, these investigators should be more flexible, patience, and supportive for everyone in their research groups. But the main key point which they should focus on that was the researchers who want to pursue fulfilling careers in science elsewhere need to be supported in all means, whatever matters, whoever may be, the ta...
Post a Comment
Read more

Single-Atom Catalysis in Chemistry World

The recent interest on the heterogeneous single-atom catalysts (SACs) were composed of atomically dispersed active metal cen ters in catalyst research field, because of the increased atom utilization and unique catalytic properties of such materials, which differ greatly from those of conventional nano or subnano counter parts. In this case, the fabrication of SACs are challenging, especially in the case of noble metal based catalysts and many researches are ongoing in this field for the development of improved catalysts. Many chall enges have faced for the hybridization of controlling of single atoms in suitable host materials, but it has also equally opened with unique opportunities for catalyst design. SACs with atomically dispersed active metal centers on supports represent an intermediary between heterogeneous and homogeneous catalysis. Therefore, understanding the homogeneous catalysis prototype creates a great opportunity for designing SACs and developing related applications....
Post a Comment
Read more