Figure - available from: Biomass Conversion and Biorefinery
This content is subject to copyright. Terms and conditions apply.
Source publication
The biomass of a yeast stain of Wickerhamomyces anomalus was evaluated as a natural biosorbent for the removal of Acid Red14 dye (AR14) in batch experiments. The outcome revealed a maximum biosorption capacity of 71.37 mg g⁻¹. Biosorption kinetic followed both the pseudo-second-order and intra-particle-diffusion model, while thermodynamic parameter...
Similar publications
![pH of the point of zero charge (pHpzc\documentclass[12pt]{minimal}...](profile/Jonas-Bayuo-2/publication/367150331/figure/fig1/AS:11431281113189981@1673751832092/pH-of-the-point-of-zero-charge-pHpzcdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
The
quantity of studies reporting on single-metal sorption systems is increasing every day while the elimination of heavy metals in binary and multisolute systems is seldom reported. Therefore, the biosorption and desorption of arsenic from single and binary systems on hybrid granular activated carbon have been investigated using the batch techniqu...
Citations
... (6) and (7)) to simulate the MB adsorption behavior. The equations are as follows (Danouche et al., 2022;Ganguly et al., 2020): ...
... The Langmuir model (Eq.(8)) highlights homogeneous monolayer adsorption on the surface of the adsorbent material at a constant temperature, whereas the Freundlich model (Eq.(9)) represents adsorption on heterogeneous surfaces with different adsorption energies (Al-Ghouti and Al-Absi, 2020; Daneshvar et al., 2019). Both models were represented in a non-linear form as follows (Danouche et al., 2022;Ganguly et al., 2020): ...
This investigation aims to evaluate the co-valorization of olive mill wastewater with other organic residues involving acid pretreatment, co-digestion, pyrolysis, and microalgae cultivation. Phosphoric acid pretreatment (5%, 60°C for 1 h) was used to solubilize the organic matter in a mixture of coffee grounds, orange peel, olive mill wastewater, and cardboard. The acidic treatment led to the production of 328 Nml of biogas/gVS, while the untreated mixture provided 257 Nml of biogas/gVS. The solid digestates were subjected to pyrolysis (500°C for 1 h), providing a biochar yield of approximately 44% for both digestates. Adsorption tests using methylene blue revealed an adsorption capacity of the biochar generated from the digestate of the acid pre-treated mixture of 4 mg/g, which was higher than that of the biochar from the untreated mixture (3.5 mg/g). The liquid digestates were also used as growth media for microalgae. Compared to the reference media (BG11), the use of the digestates-based media resulted in a lower growth rate (0.04 d-1) and biomass (247 mg/L) but significantly higher lipid content (49%). The study shows, therefore, that the use of acid pretreatment had a positive effect on biogas production (solubilization of sugars), on the adsorption efficiency of the biochar (improvement of the porosity of the material), and on the production of lipids from the microalgae which can be destined to biodiesel.
... The crystal was cleaned with analytical-grade acetone between measurements. To identify dominant functional groups for potential biosorbents [9] , peaks and their ranges were determined in FTIR spectra, along with the maximum absorbance of these peaks. ...
Traditionally, biosorbents have been used to remove contaminants from polluted water, such as wastewater, landfill leachate, rainwater or drinking water. However, two alternative uses of biosorbents have been proposed relatively
recently: the removal of heavy metals from fruit juices by
biosorption and the use of saturated biosorbents as animal
feed. Because these biosorbents are in contact with food or
are used as animal feed, the concentration of contaminants
in biosorbents must be known. In addition, the characterization of biosorbents is crucial because biosorbent properties affect both adsorption efficiency and the performance
of full-scale biosorbent systems. This article presents data
from Fourier transform infrared spectroscopy (FTIR) analysis, and the concentration of toxic metals (determined by
ICP-MS) as well as pesticide residues was determined in
ten biomass samples, namely, pea skins, straw, seaweed Fucus vesiculosus, wheat bran, rye bran, raspberry seeds, peat, buckwheat husks, highbush blueberry pulp, and blackcurrant
pulp. Selected biomass samples were also characterized by
scanning electron microscopy (SEM), nitrogen physisorption
analysis, and pyrolysis-gas chromatography-mass spectrometry (Py-GC/ MS/FID) analysis.
... Degradation/reduction of organic dyes can be done in a variety of ways [40]. For instance, the dyes can be degraded to non-toxic species by reducing with NaBH 4 . ...
Salvia (Lamiaceae family) is used as a brain tonic to improve cognitive function. The species including S. plebeia and S. moorcroftiana are locally used to cure hepatitis, cough, tumours, hemorrhoids, diarrhoea, common cold, flu, and asthma. To the best of authors’ knowledge, no previous study has been conducted on synthesis of S. plebeia and S. moorcroftiana silver nanoparticles (SPAgNPs and SMAgNPs). The study was aimed to synthesize AgNPs from the subject species aqueous and ethanol extracts, and assess catalytic potential in degradation of standard and extracted (from yums, candies, and snacks) dyes, nitrophenols, and antibiotics. The study also aimed at AgNPs as probe in sensing metalloids and heavy metal ions including Pb²⁺, Cu²⁺, Fe³⁺, Ni²⁺, and Zn²⁺. From the results, it was found that Salvia aqueous extract afforded stable AgNPs in 1:9 and 1:15 (quantity of aqueous extract and silver nitrate solution concentration) whereas ethanol extract yielded AgNPs in 1:10 (quantity of ethanol extract and silver nitrate solution concentration) reacted in sunlight. The size of SPAgNPs and SMAgNPs determined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were 21.7 nm and 19.9 nm, with spherical, cylindrical, and deep hollow morphology. The synthesized AgNPs demonstrated significant potential as catalyst in dyes; Congo red (85 %), methylene blue (75 %), Rhodamine B (<50 %), nitrophenols; ortho-nitrophenol (95–98 %) and para-nitrophenol (95–98 %), dyes extracted from food samples including yums, candies, and snacks. The antibiotics (amoxicillin, doxycycline, levofloxacin) degraded up to 80 %–95 % degradation. Furthermore, the synthesized AgNPs as probe in sensing of Pb²⁺, Cu²⁺, and Fe³⁺ in Kabul river water, due to agglomeration, caused a significant decrease and bathochromic shift of SPR band (430 nm) when analyzed after 30 min. The Pb²⁺ ions was comparatively more agglomerated and chelated. Thus, the practical applicability of AgNPs in Pb²⁺ sensing was significant. Based on the results of this research study, the synthesized AgNPs could provide promising efficiency in wastewater treatment containing organic dyes, antibiotics, and heavy metals.
... Different studies investigated the possible metals removal by SRB, and different mechanisms were proposed such as metals precipitation with biogenic sulfide from BSRA, or by metals sorption at sites on extracellular structures or polymers of SRB cell surfaces using various mechanisms such as biosorption and complexation. (Danouche et al., 2022;Gavrilescu, 2022;Xu and Chen, 2020). In accordance with the findings of this work, Azabou et al. (2007) also confirmed the possibility of Zn removal through BSRA using PG as sulfate source and were precipitated as ZnS. ...
Phosphogypsum (PG) is the largest by-product of the phosphate industry. Nearly 300 M tons of PG are annually discarded, of which 58% is dry stacked. The exposure of PG stacks to rainwater and processed waters moisture creates hydraulic pressure, generating acidic PG leachates into nearby aquifer systems. Because of its elevated levels of sulfates, phosphorus (P) and metals, the PG water leachate can negatively affect the surrounding environments. This work investigates the effect of water activity on the PG leaching, by studying the effect of different PG:Water ratios on the leaching process, followed by the anaerobic bioremediation of PG leachate through biological sulfate removal activity (BSRA). This later involves using sulfate-reducing bacteria consortium within an anaerobic bioreactor, allowing a simultaneous monitoring of the leachate’s biochemical changes, impurities removal, and microbial community dynamics. The results determined the highest sulfates and impurities leaching from PG with a PG:Water ratio of 1:200 (w:v). Subsequently, the biological treatment of the leachate exhibited an efficient removal of sulfates (79%), P (99%) and chemical oxygen demand (93%), with a substantial decline in metal concentrations (Cd, As and Al by 99%, and Zn by 70%) from the leachate. Moreover, the acidity of the leachate was also neutralized through the BSRA process by increasing the pH from 4 to 7.52. Furthermore, the microbial community dynamics unveiled a significant correlation between the leachate’s biochemical changes and co-existence of specific sulfate-reducing bacteria within various bacterial phyla, including Desulfobacterota, Firmicutes, and Proteobacteria, allowing efficient and eco-friendly bioremediation process of PG leachate.
... The results of ZnFe-SO 4 LDH were in a close agreement with the corresponding literature data 20,21 . Furthermore, for ZnFe-SO 4 LDH to check the possible impurity elements from the synthesis processes, EDX-map measurements were performed 22 . The results of the EDX-mapping microanalysis are indicated in Fig. 1c-i. ...
Layered double hydroxides (LDHs), regarding their physical and structural properties, have different and wide applications industry and their increasing use may raise ecological and human health concerns. However, the potential toxicity mechanisms of LDHs in different organisms are still unclear. In the present work, after synthesizing of ZnFe-SO4 LDH and studying of its characterization by XRD, FT-IR, SEM, EDX-mapping, TEM and Raman, its toxicity in Tetradesmus obliquus was evaluated. According to experimental results, the growth of the algae and content of photosynthetic pigments were significantly decreased after treatment with 100 mg/L of ZnFe-SO4 LDH. The high dose exposure to the LDH also inhibited the activity of SOD and POD enzymes, possibly due to the LDH- catalyzed reactive oxygen species production. In addition, lipid peroxidation and the content of phenolic compounds, as no-enzymatic antioxidants were increased by enhancement of the LDH concentration. The rise of phenol, flavonoids and MDA contents could be regarded as some manifestations and responses to the toxic effects of the contaminant in the algae cells. The results provided a better understanding of the undesirable effects and toxicity of LDHs in aquatic organisms.
... For example, Cui et al. (2022) found that the chemical adsorption of REEs in silica modified by diethylenetriaminepentaacetic dianhydride (DTPADA) as DTPADA- SBA-15 occurred through the coordination of oxygen with REEs at lower pH values. Surface complexation occurs through weak interactions such as electrostatic forces, Van der Waals interactions, or hydrogen bonding on the surface of the adsorbent (Danouche et al., 2022a(Danouche et al., , 2022b. The ion exchange mechanism occurs when REEs are substituted with other ions in the adsorbent material. ...
... To carry out this optimization, the statistical design of experiments (DOE) approach was used instead of the traditional optimization approach of "one factor at a time", which has certain limitations. Notably, it does not recognize the interactions between independent factors and does not provide complete knowledge of the effects caused by all the determinants [17]. Overall, the following points are addressed in detail throughout this study: (i) Characterizing PG sample and optimizing SO 4 (iv) Bioreduction of leached SO 4 2− from PG using the selected consortium in a batch bioreactor. ...
... The black precipitates obtained with the bacterial consortia showing the highest SO 4 2− reduction capacity was then analyzed by scanning electron microscopy (SEM) using the JEOL JSM-IT500 HR InTouch-Scope™, equipped with an X-ray microanalyzer (EDX). The SEM analytical parameters were configured as follows: Signal SED, with magnifications ranging from × 1000 to × 55.000, a landing voltage of 3.0 kV, an operation distance of 10.1 mm, under high-vacuum mode [17]. ...
Phosphogypsum (PG) is generated annually from phosphoric acid production. This by-product contains 50% of sulfate (SO42−), which can be recycled biologically. Biorecovery of elemental sulfur (S0) involves firstly converting SO42− into biogenic sulfide using sulfate-reducing bacteria under anaerobic conditions, then oxidizing the sulfide produced into S0 using sulfur-oxidizing bacteria. This study focused on selecting and evaluating natural microbial consortia from SO42− rich biotopes for their application in the initial first step of S0 biorecovery. The PG sample was first comprehensively characterized using ICP-MS/OES, XRD, FTIR, and TGA analyses. Subsequently, SO42− leaching optimization was performed through a design of experiments approach. The analysis revealed that CaSO4 was the major component of the PG (78%), and the optimal parameters for leaching of SO42− from PG were at a NaOH concentration of 7.4% and PG concentration of 158 g.L−1. Furthermore, the MYC-consortium isolated from a hydrothermal niche demonstrated the highest reduction capacity among the studied consortia. It also exhibited the highest performance under SO42− concentrations up to 3.5 g.L−1, salinity levels up to 30 g.L−1, and in the presence of 60 ppm of Zn(II), 3 ppm of Cd(II), and 6 ppm of Pb(II). Moreover, this consortium showed a high capacity for reducing SO42− in the bioreactor (90% after 6 weeks) when utilizing SO42− from the PG-leached solution, as attested by the chemical analyses of the precipitate formed in the bioreactor. This research offers a comprehensive insight into the potential of MYC-consortium to convert leached SO42− from PG into sulfide, which is the most critical step in the S0-biorecovery.
... This was also confirmed by the zeta potential, which reveals that QBW surfaces are negatively charged throughout the pH range studied (2− 10). Another study performed by [94] reported that bio-sorbents developed from softwood pellets exhibit a pHzpc at 6.57, which is compatible with the adsorption of a cationic dye namely MB; the biomass surface reported is rich in -OH, C--O cluster of carboxyl, carbonyl groups, and Si-O-Si, that may have caused substantial deprotonation of the functional groups and the appearance of a net negative charge on the biomass surface [90]. Briefly, the number of negatively charged sites increases when the pH tends to high values, which favors the attraction between the QBW surface and the MB. ...
ynthetic toxic dyes from liquid wastes can be harmful for living organisms and the environment, even at low concentrations. This research investigated the utilization of the Chenopodium quinoa pericarp bio-waste (QBW) after saponin glycosides extraction as biosorbent in the removal of methylene blue (MB) dye as a model contaminant from aqueous solution. QBW was successfully modified by chemical (sulfuric acid) and thermal (pyrolysis) treatments. The biosorbent was characterized by FTIR, TGA, BET, Zeta Potential, SEM/EDX, and contact angle analysis to get further insight into the adsorbent’s behavior and to propose a suitable biosorption mechanism. Batch experiments were explored to study the effect of various parameters on MB removal efficiency, including contact time, adsorbent quantity, initial concentration, and process temperature. The optimum conditions for QBW biosorption of MB were at neutral pH and contact time of 60 min. The maximum adsorption capacity of the biosorbent (QBW-II), which demonstrated the highest MB removal efficiency in the biosorption test was 193.802 ± 4.365 mg.g−1. The kinetic and isotherm study of MB dye biosorption revealed that the pseudo-second-order model and Langmuir isotherm were the best fit. Thermodynamic parameters for the biosorption showed that the process was spontaneous and exothermic. Our findings demonstrate that QBW has a high potential to be used as an environmentally friendly and promising bio-sorbent to effectively remove organic contaminants from aqueous systems.
... Recently, the use of natural fibers in the development of bio-composites has attracted more attention of researchers, which may provide access to additional high value applications [9][10][11][12][13][14]. The development of reinforced thermoplastic polymers using cellulose fibers has brought several challenges, such as low compatibility between the hydrophilic cellulose and hydrophobic polymers [15]. ...
The aim of this work is the valorisation of bagasse cane by-product for the development of a new bio-composite based on Polypropylene (PP) reinforced with diferent cellulose derivatives. In this study, the efect of fber’s chemical surface treatments on the thermal and mechanical performance of PP was investigated, in particular, a comparison between three chemical treatments (alkali, bleaching, and coupling agent). Bio-composite materials were prepared using twin-screw extrusion followed by injection molding by mixing PP pellet with 5 to 10 Wt.% of raw bagasse cane (RBC), alkali bagasse cane (ABC) and cellulose microfbers (CMF), as well as CMF with Styrene-(ethylene-butene)-styrene three-block co-polymer grafted with maleic anhydride (SEBS-g-MA) as coupling agent. Overall, the thermal analysis reveals that the addition of fbers reduces the thermal stability of the reinforced PP. The mechanical results show an improvement in the values of Yung’s modulus, tensile strength and hardness of the reinforced PP compared to neat PP. However, a remarkable decrease was obtained in elongation at break and toughness for all reinforced composites compared to neat PP. These fndings clearly show the advantages in the use of thermoplastic matrix reinforced with cellulosic fbers.
... For example, the use of surfactin in charcoal flotation was reported to be effective through enhancing the hydrophobicity of the coal surface at several pH value, namely 3, 6 and 10 (Augustyn et al. 2021). In the interest of researching new sources of reagents used in ore processing, commercial baker's yeast cells Saccharomyces cerevisiaea were applied thanks to their simple industrial cultivation (Danouche et al. 2021b(Danouche et al. , 2022. Microflotation tests were performed to evaluate the effect of pH on apatite recovery. ...
The transition of the mineral processing sectors, which depend mainly on various petroleum-origin chemicals, to the green industry based on the production of greener materials and the reduction of carbon footprints, is mandatory due to the growing concerns regarding the extensive environmental impact of the mining industry. In this context, biological ore beneficiation is spurring increasing interest from scientists and industrials. The latest scientific developments in bio-metallurgy have allowed it to exploit biotechnologies in the flotation process as a novel/cleaner approach for separating gangue materials from valuables minerals. Current fundamental research projects have focused on the progress of biotechnology and the employment of biopolymers, microorganisms, and their metabolites, as well as plant-derived biosurfactants in the emerging field of bioprocessing, particularly bioflotation. Almost all studies on flotation have focused on chemical and physical parameters, and the role of natural biosurfactants remains little explored. This review presents a thorough understanding of the bioflotation concept by assessing previous research on several elements of bioflotation, including the impacts of biotechnology and operating factors (pH, biomass, and biosurfactants concentration), probable mechanisms, and unexplored areas, but from various pragmatic viewpoints. Recent studies are summarized by categorizing microorganisms, plants, and biopolymers based on their bioflotation performances. Furthermore, the most recent research investigations on biological flotation of specific minerals (salt-type sulphide and oxide) are reviewed. Finally, critical challenges of bioflotation are discussed, and novel perspectives are provided to contribute to solving the difficulties faced in its implementation.
Graphical abstract
