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Electrocatalytic cleavage of a lignin β-O-4 model compound and coupling with nitrogen-containing aromatics using Prussian blue analogue-derived nickel–cobalt spinel

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Journal of Energy Chemistry 2025年第1期100卷 628-636页

作者： Yi Qi Xueying Chen Bowen Liu Xuliang Lin Xueqing Qiu Yanlin Qin Guangdong Provincial Key Laboratory of plant Resources Biorefinery School of Chemical Engineering and Light Industry Guangdong University of Technology Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang center Guangdong Basic Research center of Excellence for Ecological Security and Green development Guangdong University of Technology

Electrochemical conversion of lignin for the production of high-value heterocyclic aromatic compounds has great *** demonstrate the targeted synthesis and cation modulation of NiCo2O4spinel nanoboxes,synthesized via cation exchange and calcination *** catalysts exhibit excellent efficacy in the electrocatalytic conversion of lignin model compounds,specifically 2-phenoxy-1-phenylethanol,into nitrogen-containing aromatics,achieving high conversion rates and *** catalysts were synthesized via a cation exchange and calcination oxidation process,using Prussian blue nanocubes as *** porous architecture and polymetallic composition of the NiCo2O4spinel demonstrated superior performance in electrocatalytic oxidative coupling,achieving a 99.2 wt%conversion rate of the 2-phenoxy-1-phenylethanol with selectivities of 37.5 wt%for quinoline derivatives and 31.5 wt%for *** innovations include the development of a sustainable one-pot synthesis method for quinoline derivatives,the elucidation of a multistage reaction pathway involving CAO bond cleavage,hydroxyaldol condensation,and CAN bond formation,and a deeper mechanistic understanding derived from DFT *** work establishes a new strategy for lignin valorization,offering a sustainable route to produce high-value nitrogen-containing aromatics from renewable biomass under mild conditions,without the need for additional reagents.

关键词： Spinel Biomass valorization Electrocatalysis Lignin oxidation Coupling

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Lignin and holocellulose from coir pith involved in trimethylamine(fishy odor) adsorption

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Journal of Environmental Sciences 2019年第5期31卷 43-53页

作者： Nuttapong Santawee Chairat Treesubsuntorn Paitip Thiravetyan School of Bioresources and Technology King Mongkut's University of Technology Thonburi pilot plant development and Training Institute King Mongkut's University of Technology Thonburi

Coir pith is a highly potential adsorbent for adsorbing trimethylamine(TMA). It harbors a higher adsorption capacity for TMA compared to commercial activated carbon(CAC). It was found that lignin and holocellulose extracted from coir pith played an important role in TMA adsorption. Lignin itself had the highest TMA adsorption capacity(269.01 mg/g)followed by holocellulose(75.43 mg/g), coir pith(14.3 mg/g) and CAC(10.26 mg/g),respectively. The pseudo-first-and second orders were applied to the kinetic data. For the adsorption of TMA by coir pith, the best fit was achieved by the pseudo-second *** studies showed an endothermic and physico-chemical adsorption process between TMA and the coir pith. TMA desorption study suggested that only 14%–47% of TMA was desorbed with distilled water. In addition, Fourier transform-infrared(FT-IR) spectra showed that C–H bond(methyl group), C–O bond from phenolic alcohol and C–O bond from tertiary alcohol in lignin and holocellulose were involved in TMA adsorption. Coir pithbased filter showed high TMA adsorption efficiency(98%) and kept constant for more than48 days in a continuous system. pilot scale experiment, coir pith beads filter could be succesfully applied as a packing material for TMA removal. Therefore, coir pith can be used as a promising packing material for TMA treatment at contaminated site.

关键词： Trimethylamine(TMA) Fishy odor Lignin Coir pith Holocellulose

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Neural-fuzzy control system application for monitoring process response and control of anaerobic hybrid reactor in wastewater treatment and biogas production

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Journal of Environmental Sciences 2010年第12期22卷 1883-1890页

作者： Chaiwat Waewsak Annop Nopharatana Pawinee Chaiprasert Division of Biotechnology School of Bioresources and TechnologyKing Mongkut's University of Technology Thonburi Excellent center of Waste Utilization and Management Pilot Plant Development and Training InstituteKing Mongkut's University of Technology Thonburi

Based on the developed neural-fuzzy control system for anaerobic hybrid reactor （AHR） in wastewater treatment and biogas production, the neural network with backpropagation algorithm for prediction of the variables pH, alkalinity （Alk） and total volatile acids （TVA） at present day time t was used as input data for the fuzzy logic to calculate the influent feed flow rate that was applied to control and monitor the process response at different operations in the initial, overload influent feeding and the recovery phases. In all three phases, this neural-fuzzy control system showed great potential to control AHR in high stability and performance and quick response. Although in the overloading operation phase II with two fold calculating influent flow rate together with a two fold organic loading rate （OLR）, this control system had rapid response and was sensitive to the intended overload. When the influent feeding rate was followed by the calculation of control system in the initial operation phase I and the recovery operation phase III, it was found that the neural-fuzzy control system application was capable of controlling the AHR in a good manner with the pH close to 7, TVA/Alk 〈 0.4 and COD removal 〉 80% with biogas and methane yields at 0.45 and 0.30 m^3/kg COD removed.

关键词： anaerobic hybrid reactor influent feed flow rate neural-fuzzy control system process response

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Extraction and characterization of alumina nanopowders from aluminum dross by acid dissolution process

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International Journal of Minerals,Metallurgy and Materials 2015年第4期22卷 429-436页

作者： Saifur Rahman Sarker Zahangir Alam Rakibul Qadir M A Gafur Mohammad Moniruzzaman Department of Applied Chemistry and Chemical Engineering University of Dhaka pilot plant & Project development Centre (PP& PDC) Bangladesh Council of Scientific and Industrial Research (BCSIR) BCSIR Laboratories Dhaka

A significant amount of aluminum dross is available as a waste in foundry industries in Bangladesh. In this study, alumina was ex- tracted from aluminum dross collected from two foundry industries situated in Dhamrai and Manikgang, near the capital city, Dhaka. Alu- minum dross samples were found to approximately contain 75wt% A1203 and 12wt% SIO2. An acid dissolution process was used to recover the alumina value from the dross. The effects of various parameters, e.g., temperature, acid concentration, and leaching time, on the extrac- tion of alumina were studied to optimize the dissolution process. First, AI（OH）3 was produced in the form of a gel. Calcination of the AI（OH）3 gel at 1000℃, 1200℃, and 1400℃ for 2 h produced O-AlcOa, （t~＋O）-A1203, and u-alumina powder, respectively. Thermal charac- terization of the AI（OH）3 gel was performed by thermogravimetric/differential thermal analysis （TG/DTA） and differential scanning calo- rimetry （DSC）. The phases and crystallite size of the alumina were determined by X-ray diffraction analysis. The dimensions of the alumina were found to be on the nano level. The chemical compositions of the aluminum dross and alumina were determined by X-ray fluorescence （XRF） spectroscopy. The microstructure and morphology of the alumina were studied with scanning electron microscopy. The purity of the alumina extracted in this study was found to be 99.0%. Thus, it is expected that the obtained alumina powders can be potentially utilized as biomaterials.

关键词： aluminum dross alumina nanoparticles acid dissolution calcination X-ray fluorescence analysis

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Hydrophobic polyethersulfone porous membranes for membrane distillation

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Frontiers of Chemical Science and Engineering 2015年第1期9卷 84-93页

作者： Heba ABDALLAH Ayman EL-GENDI Maaly KHEDR Elham EL-ZANATI Chemical Engineering & pilot plant Department Engineering Research Division National Research Center 33 Bohouth st. Dokki Giza Egypt

Membrane distillation （MD） is a thermal, vapor-driven transportation process through micro porous hydrophobic membranes that is increasingly being applied to seawater and brine desalination processes. Two types of hydrophobic microporous polyethersulfone fiat sheet membranes, namely, annealed polyethersulfone and a polyethersulfone/tetraethoxysilane （PES/TEOS） blend were prepared by a phase inversion process. The membranes were characterized and their performances were investigated using the vacuum membrane distillation of an aqueous NaCI solution. The performances of the prepared membranes were also compared with two commercially available hydrophobic membranes, polyte- trafluorethylene and polyvinylidene fluoride. The influence of operational parameters such as feed temperature （25-65 ℃）, permeate vacuum pressure （200 800 mbar）, feed flow rate （8-22 mL/s） and feed salt concentration （3000 to 35000 mg/L） on the MD permeation flux were investigated for the four membranes. The hydrophobic PES/TEOS membrane had the highest salt rejection （99.7%） and permeate flux （86 kg/（m^2 -h）） at 65 ℃, with a feed of 7000 ppm and a pressure of 200 mbar.

关键词： membrane distillation hydrophobic membrane salt rejection permeate flux

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Effect of Strain Rate on Tensile Behavior of Sn-9Zn-xAg-ySb;{(x, y) = (0.2, 0.6), (0.2, 0.8), (0.6, 0.2), (0.8, 0.2)} Lead-Free Solder Alloys

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Materials Sciences and Applications 2023年第4期14卷 273-283页

作者： Shihab Uddin Md. Abdul Gafur Mohammad Obaidur Rahman Department of Physics Jahangirnagar University Savar Dhaka Bangladesh pilot plant and process development Centre Dhaka Bangladesh

The tensile properties of Sn-9Zn-xAg-ySb;{(x, y) = (0.2, 0.6), (0.2, 0.8), (0.6, 0.2), (0.8, 0.2)} lead-free solders were investigated. All the test samples were annealed at 150°C for 1 hour. The tests are carried out at room temperature at the strain rate of 4.17 × 10-3 s-1, 20.85 × 10-3 s-1, and 208.5 × 10-3 s-1. It is seen that the tensile strength increases and the ductility decrease with increasing the strain rate over the investigated range. From the strain rate change test results, the strain sensitivity values are found in the range of 0.0831 to 0.1455 due to the addition of different alloying elements.

关键词： Lead-Free Solder Strain Rate Strain Sensitivity Ductility Tensile Properties

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Proteomic studies of plant and bacteria interactions during benzene remediation

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Journal of Environmental Sciences 2020年第8期32卷 161-170页

作者： Wararat Sriprapat Sittiruk Roytrakul Paitip Thiravetyan Department of Agriculture Biotechnology Research and Development OfficeSirindhorn Plant Genetic Resources BuildingPathum Thani 12110Thailand pilot plant development and Training Institute King Mongkut’s University of Technology ThonburiBangkok 10150Thailand National center for Genetic Engineering and Biotechnology(BIOTEC) Thailand Science ParkPathum Thani 12120Thailand Division of Biotechnology School of Bioresources and TechnologyKing Mongkut’s University of Technology ThonburiBangkok 10150Thailand

Phytoremediation is a sustainable remedial approach for removing benzene from *** associated bacteria could ameliorate the phytotoxic effects of benzene on plant,although the specificity of these interactions is ***,we used proteomics approach to gain a better understanding of the mechanisms involved in plant-bacteria *** associated bacteria was isolated and subsequently inoculated into the sterilized Helianthus annuus,and the uptake rates of benzene by these inoculated plants were *** the end of the experiment,leaves and roots proteins were *** results showed inoculated *** with strain EnL3 removed more benzene than other treatments after 96 ***3 was identified as Enterobacter *** to 16S rDNA *** on the comparison of proteins,62 proteins were significantly up or down regulated in inoculated leaves,while 35 proteins were significantly up or down regulated in inoculated ***,there were 4 and 3 identified proteins presented only in inoculated *** leaves and roots,*** proteins involved in several functions including transcription and translation,photosynthesis,and stress *** network among anti-oxidant defense system,protein synthesis,and photosynthetic electron transfer are involved in collaboratively activate the benzene uptake and stress tolerance in plant.

关键词： Proteomics Phytoremediation plant and bacteria interactions Benzene Air pollution

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Combination eect of pH and acetate on enzymatic cellulose hydrolysis

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Journal of Environmental Sciences 2009年第7期21卷 965-970页

作者： ROMSAIYUD Angsana SONGKASIRI Warinthorn NOPHARATANA Annop CHAIPRASERT Pawinee Division of Biotechnology School of Bioresources and Technology King Mongkut's University of Technology Thonburi Thakham Bangkhuntien Bangkok 10150 Thailand Excellent center of Waste Utilization and Management National Center for Genetic Engineering and Biotechnology Bangkhuntien Bangkok 10150 Thailand pilot plant development and Training Institute King Mongkut's University of Technology Thonburi Bangkhuntien Bangkok 10150 Thailand

The productivity and efficiency of cellulase are significant in cellulose hydrolysis. With the accumulation of volatile fatty acids （VFAs）, the pH value in anaerobic digestion system is reduced. Therefore, this study will find out how the pH and the amount of acetate influence the enzymatic hydrolysis of cellulose. The effects of pH and acetate on cellulase produced from Bacillus coagulans were studied at various pH 5-8, and acetate concentrations （0-60 mmol/L）. A batch kinetic model for enzymatic cellulose hydrolysis was constructed from experimental data and performed. The base hypothesis was as follows： the rates of enzymatic cellulose hydrolysis rely on pH and acetate concentration. The results showed that the suitable pH range for cellulase production and cellulose hydrolysis （represents efficiency of cellulase） was 2.6-7.5, and 5.3-8.3, respectively. Moreover, acetate in the culture medium had an effect on cellulase production （KI = 49.50 mmol/L, n = 1.7） less than cellulose hydrolysis （/（＇i = 37.85 mmol/L, n = 2.0）. The results indicated that both the pH of suspension and acidogenic products influence the enzymatic hydrolysis of cellulose in an anaerobic environment. To enhance the cellulose hydrolysis rate, the accumulated acetate concentration should be lower than 25 mmol/L, and pH should be maintained at 7.

关键词： acetate Bacillus coagulans cellulase cellulose hydrolysis kinetics

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Preparation and Characterization of Raw and Chemically Modified Sponge-Gourd Fiber Reinforced Polylactic Acid Biocomposites

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Materials Sciences and Applications 2018年第2期9卷 281-304页

作者： Taimur -Al-Mobarak Md. Abdul Gafur Md. Forhad Mina Department of Physics Bangladesh University of Engineering & Technology (BUET) Dhaka Bangladesh pilot plant & process development center Bangladesh Council of Scientific & Industrial Research (BCSIR) Dhaka Bangladesh

This research work has been undertaken to fabricate environmentally friendly biocomposites for biomedical and household applications. Sponge-gourd fibers (SGF) obtained from Luffa cylindrica plant were chemically treated separately using 5 and 10 wt% NaOH, acetic anhydride and benzoyl chloride solutions. SGF reinforced polylactic acid (PLA) biocomposites were fabricated using melt compounding technique. Surface morphological, structural, mechanical and thermal properties, as well as antibacterial activities of raw and chemically modified SGF reinforced PLA (SGF-PLA) composites were characterized by field emission scanning electron microscopy, Fourier transform infrared spectrometry, X-ray diffractometry, universal testing method, thermogravimetry, and Kirby-Bauer agar diffusion method, respectively. Surface morphology indicates that after treatment of fibers, the interfacial adhesion between PLA and fibers is improved. X-ray diffractometry result shows that chemical treatment of fibers improves the crystallinity and exhibits new chemical bond formation in the composites. After chemical treatment, compressive strength of the composites is found to increase by 10% - 35%. The thermal stability of the treated fiber reinforced composites is also found to increase significantly. The composites have no antibacterial activities and no cytotoxic effect on non-cancer cell line. Soil burial test has confirmed that the composites are biodegradable. Benzoyl chloride treatment of fibers shows superior mechanical properties and enhances thermal stability among the composites.

关键词： Sponge-Gourd Fiber Polylactic Acid Chemical Modification Biocomposites Antibacterial Activities

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Reclamation of Lithium Cobalt Oxide from Waste Lithium Ion Batteries to Be Used as Recycled Active Cathode Materials

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Materials Sciences and Applications 2018年第1期9卷 142-154页

作者： Rakibul Qadir Fahmida Gulshan Dept. of Materials and Metallurgical Engineering Bangladesh University of Engineering and Technology Dhaka Bangladesh pilot plant and process development center Bangladesh Council of Scientific and Industrial Research Dhaka Bangladesh

Waste laptop batteries (Type-Lithium ion) have been collected and manually dismantled in the current work. Active electrode materials were scraped off from the copper current collector and polyethylene separators. The aluminum current collectors were found to be severely damaged and attached with the electrode material. It was treated with NaOH later to be recovered as Al2O3. The leaching of LiCoO2 was done by 3 M HCl aided by 5% H2O2 at 60°C from the scraped active electrode materials (LiCoO2 and graphite) leaving the graphite completely. Co was precipitated as hydroxide by the addition of NaOH and later converted to Co3O4. The remaining solution was treated with saturated Na2CO3 to acquire Li2CO3 as crystalline precipitate with high purity. The recovery of Co and Li was 99% and 30%, respectively. Co3O4 and Li2CO3were mixed in stoichiometric proportions and calcined around 950°C with air supply to achieve LiCoO2 successfully.

关键词： LiCoO2 Lithium Ion Battery (LIB) Reclamation of LiCoO2 Leaching Active Cathode Materials

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