Valorization of sawdust by mineral acid assisted hydrothermal carbonization for the adsorptive removal of bisphenol A: A greener approach

Chandrasekar, R; Rajendran, Harish Kumar; Priyan, V. Vishnu; Narayanasamy, Selvaraju

doi:10.1016/j.chemosphere.2022.135171

Cited by 39 publications

(6 citation statements)

References 33 publications

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“…According to the Van Krevelen diagram, the phenomenon of O/C atomic ratios decreasing and the H/C basically unchanging was perhaps due to the improving of glucose decarbonylation by the high concentration substrate used in this experiment [20]. It is the general law for biomass that HTC process will cause an increase in C content and decrease in O content [21,22]. The characteristics of H-G1 and H-G3 obtained in the condition of adding small amount of SA were consistent with this law, because the acid played a role in accelerating the rate of glucose hydrolysis and favored the carbonization process [23][24][25].…”

Section: Hydrochar Yields and Distribution Of Organic Carbon Between ...mentioning

confidence: 83%

Fabricating Porous Carbon Materials by One-Step Hydrothermal Carbonization of Glucose

Yao

Zhang

2023

Processes

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The present study concerned the production of glucose-based porous carbon materials by a one-step acid-catalyzed HTC. The samples were characterized by elemental analysis (EA), scanning electron microscope (SEM), Brunauer–Emmett–Teller (BET), Fourier transform infrared (FTIR) and point of zero charge (pzc). Experimental results showed that the addition of sulfuric acid (SA) with different dosages in the HTC system could improve the yield of products and reduce chemical oxygen demand (COD) of the process water. When the glucose and acid was at a mass ratio of 1:4 (glucose: SA = 1:4), the hydrochar obtained (H-G9) had a larger specific surface area (SBET = 296.71 m2/g) and higher abundance of functional groups on the surface than that of other samples, such as sulfur-containing functional groups and carboxylic groups, belonged to the mesoporous material with highly negatively surface charged. H-G9 exhibited the optimum adsorption for methylene blue (MB). H-G9 adsorbed MB with an initial concentration of 10 mg/L at pH 6 and 25 °C. The adsorption isotherm of MB on H-G9 demonstrated that Freundlich isotherm could be better applied. Regeneration efficiency of 88% was achieved by HTC process for saturated H-G9. This study prepared a porous carbon material by the simple one-step hydrothermal carbonization of glucose in the presence of SA. The maximum monolayer adsorption capacity as high as 332.46 mg/g for MB, which was well beyond that of commercial activated carbon (259.37 mg/g). This indicates that H-G9 has great potential for the removal of MB from wastewater.

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Section: Hydrochar Yields and Distribution Of Organic Carbon Between ...mentioning

confidence: 83%

Fabricating Porous Carbon Materials by One-Step Hydrothermal Carbonization of Glucose

Yao

Zhang

2023

Processes

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“…9 -B, the absorption capacity of BPA increased from 13.07 to 216.92 mg g −1 and 5.19–73.53 mg g −1 for PC-H and PC-Z, respectively, upon increasing the BPA concentration within the range of 5–200 mg L −1 . Therefore, increasing the BPA initial concentration produced a higher driving force between the adsorbent surface and the molecule, promoting rapid mass transfer [ 51 ]. At all concentrations, the adsorption capacity of PC-H on BPA was significantly higher than that of PC-Z due to its unique structure and higher surface area.…”

Section: Resultsmentioning

confidence: 99%

Porous activated carbons derived from waste Moroccan pine cones for high-performance adsorption of bisphenol A from water

Jari,

Roche,

Chaker Necibi

et al. 2024

Heliyon

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“…Equilibrium biosorption isotherms are one of the most important data for understanding the mechanisms of the biosorption process (Tafakori et al, 2017). Although the Langmuir isotherm model supposes that adsorption is single-layered and homogenous, the Freundlich model supposes that adsorption is multilayered and happens on a heterogeneous surface (Chandrasekar et al, 2022;Bedadeep et al, 2023;Chandrasekar et al, 2024). The curves Biosorption rate (%) Adsorption capacity (mg g-1) and isotherm parameters of the Langmuir and Freundlich isotherm models are shown in Figure 3 and Table 3, respectively.…”

Section: Isotherm Kinetic and Thermodynamic Studiesmentioning

confidence: 99%

Equilibrium, kinetic, and thermodynamic studies on the biosorption of lead by human metallothionein gene‐cloned bacteria as a novel biosorbent

Akkurt,

Uçkun,

Oğuz

et al. 2024

Water Environment Research

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Heavy metals are the main pollutants in water and are an important global problem that threatens human health and ecosystems. In recent years, there has been an increasing interest in the use of genetically modified bacteria as an eco‐friendly method to solve heavy metal pollution problems. The goal of this study was to generate genetically modified Escherichia coli expressing human metallothioneins (hMT2A and hMT3) and to determine their tolerance, bioaccumulation, and biosorption capacity to lead (Pb2+). Recombinant MT2A and MT3 strains expressing MT were successfully generated. Minimum inhibition concentrations (MIC) of Pb for MT2A and MT3 were found to be 1750 and 2000 mg L−1, respectively. Pb2+ resistance and bioaccumulation capacity of MT3 were higher than MT2A. Therefore, only MT3 biosorbent was used in Pb2+ biosorption, and its efficiency was examined by performing experiments in a batch system. Pb2+ biosorption by MT3 was evaluated in terms of isotherms, kinetics, and thermodynamics. The results showed that Pb biosorption fits to the Langmuir isotherm model and the pseudo‐first‐order kinetic model, and the reaction is exothermic. The maximum Pb2+ capacity of the biosorbent was 50 mg Pb2+g−1. The potential of MT3 in Pb biosorption was characterized by Fourier‐transform infrared spectroscopy (FT‐IR), scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM) analyses. The desorption study showed that the sorbent had up to 74% recovery and could be effectively used four times. These findings imply that this biosorbent can be applied as a promising, precise, and effective means of removing Pb2+ from contaminated waters.Practitioner Points In this study, the tolerance levels, bioaccumulation, and biosorption capacities of Pb in aqueous solutions were determined for the first time in recombinant MT2A and MT3 strains in which human MT2A and MT3 genes were cloned. The biosorbent of MT3, which was determined to be more effective in Pb bioaccumulation, was synthesized and used in Pb biosorption. The Pb biosorption mechanism of MT3 biosorbent was identified using isotherm modeling, kinetic modeling, and thermodynamic studies. The maximum Pb removal percentage capacity of the biosorbent was 90%, whereas the maximum biosorption capacity was up to 50 mg Pb2+g−1. These results indicated that MT3 biosorbent has a higher Pb biosorption capacity than existing recombinant biosorbents. MT3 biosorbent can be used as a promising and effective biosorbent for removing Pb from wastewater.

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Valorization of sawdust by mineral acid assisted hydrothermal carbonization for the adsorptive removal of bisphenol A: A greener approach

Cited by 39 publications

References 33 publications

Fabricating Porous Carbon Materials by One-Step Hydrothermal Carbonization of Glucose

Fabricating Porous Carbon Materials by One-Step Hydrothermal Carbonization of Glucose

Porous activated carbons derived from waste Moroccan pine cones for high-performance adsorption of bisphenol A from water

Equilibrium, kinetic, and thermodynamic studies on the biosorption of lead by human metallothionein gene‐cloned bacteria as a novel biosorbent

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