Article
Chemistry, Physical
Yanling Jin, Jiayi Wang, Xin Gao, Fang Ren, Zhengyan Chen, Zhenfeng Sun, Penggang Ren
Summary: In this study, C, N doped TiO2 supported on spent coffee grounds-derived carbon (ACG) was successfully prepared, showing improved light absorption efficiency and degradation efficiency of organic dyes through in situ formation on ACG.
Article
Materials Science, Multidisciplinary
Carolina Inacio Portela, Tayra Rodrigues Brazil, Thais Aline Prado Mendonca, Elias Barros Santos, Raquel Aparecida Domingues, Nirton Cristi Silva Vieira, Maraisa Goncalves
Summary: This study demonstrated the feasibility of producing activated carbon from coffee husk waste and activating it using CaCl2. The activated carbon was then used as a support for TiO2, resulting in a TiO2/AC composite with high photocatalytic activity.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Agricultural Engineering
Ales Hanc, Tereza Hrebeckova, Alena Grasserova, Tomas Cajthaml
Summary: The study focused on vermicomposting of spent coffee grounds (SCG) and its mixtures with straw pellets, evaluating the biological and physico-chemical properties of the process. The treatment with 25% vol. SCG + 75% vol. straw pellets showed the highest number and biomass of earthworms. Earthworm weight decreased as layer age increased, with the oldest treatment layer having suitable agrochemical properties. Earthworms were effective in reducing caffeine stimulant content during the vermicomposting process.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Hyeok-Jin Kim, Sea-Cheon Oh
Summary: The study showed that hydrothermal carbonization with subcritical water can improve the fuel characteristics of spent coffee grounds, increasing fixed carbon content and heating value, making the fuel characteristics similar to coal as the reaction temperature increases.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Simona Bettini, Michela Ottolini, Rosanna Pagano, Sudipto Pal, Antonio Licciulli, Ludovico Valli, Gabriele Giancane
Summary: Carbon nanomaterials with sp(2)/sp(3) carbon backbone possess peculiar physical chemical features suitable for various applications. Carbon nanoparticles produced from spent coffee grounds exhibit unique properties, such as rapid reduction of Mn(VII) to Mn(II) and Cr(VI) to Cr(III), due to the presence of heteroatoms and surface functional groups. The formation and characterization of these carbon nanomaterials were achieved through a sustainable and eco-friendly oxidation process.
Article
Environmental Sciences
Yue Wang, Qingbai Tian, Guanyun Yang, Xiaoqiang Li, Wei Du, Yoong Kit Leong, Jo-Shu Chang
Summary: In this study, iron oxide-modified coffee grounds biochar (CGF) was prepared at different temperatures for the enhanced removal of chlortetracycline (CTC) through adsorption and degradation. The results showed that electrostatic interaction was the main mechanism for CTC removal, while pore diffusion, hydrogen bonds, and 7C-7C bonds also contributed to its adsorption. Higher temperature pyrolysis of coffee grounds increased the CTC adsorption capacity, but there were no significant advantages in using biochar prepared at a higher temperature for persulfate activation.
Article
Environmental Sciences
Devagi Kanakaraju, Muhamad Akif Aizuddin Jasni, Andrea Pace, Muhamad Hazim Ya
Summary: The Cu/TiO2/FA composite was optimized for the removal of the model dye pollutant methyl orange under visible light irradiation using response surface methodology and Box-Behnken experimental design. The study considered three independent variables and achieved a 99.91% removal rate under the optimal operating conditions. The results support the hypothesis of a combined and synergic adsorption-photocatalytic degradation process for pollutant removal.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Gwajeong Jeong, Chan Ho Park, Dongchan Yi, Hyunseung Yang
Summary: This study presents a sustainable, high throughput method for producing uniform carbon dots using spent coffee grounds via a simple wet ball-milling process. The versatility of this approach extends to the synthesis of heteroatom-doped carbon dots and the preparation of carbon dots from various sources of spent coffee grounds. Manipulating the functional groups of the carbon dots through the addition of citric acids during the ball-milling process, carboxylic acid-functionalized carbon dots were produced. These carbon dots exhibited highly selective and sensitive detection of Fe3+ ions in aqueous solution, and the relevant quenching mechanism was investigated. Additionally, a fluorescent microgel sensor was demonstrated to exhibit a rapid, ratiometric fluorescence change upon the addition of Fe3+ ions by encapsulating the carboxylic acid-functionalized carbon dots within the microgel matrix.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Huihui Feng, Yan Zhang, Fengling Cui
Summary: Cuprous oxide (Cu2O), a p-type semiconductor material, has been found to play a significant role in photocatalysis, and enhancing its photocatalytic activity can be effectively achieved by introducing CQDs, leading to improved degradation of methylene blue and antibacterial activity against Escherichia coli.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Chemical
Xi-Er Chen, Dave Mangindaan, Hsiu-Wen Chien
Summary: This study discovered that spent coffee grounds (SCG) possess photothermal properties under near-infrared laser irradiation, making them suitable for applications as photothermal materials. Additionally, when incorporated into polyNIPAM hydrogels, SCGs can induce thermal shrinkage and bending, indicating their potential as photothermal actuators. These findings provide new insights for the recycling and reuse of SCGs.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Multidisciplinary Sciences
Nida Qutub, Preeti Singh, Suhail Sabir, Suresh Sagadevan, Won-Chun Oh
Summary: Photocatalytic degradation of organic contaminants in wastewater is crucial for ecological and environmental safety. CdS/TiO2 nanocomposites synthesized using a modified Chemical Precipitation technique exhibit high photocatalytic activity and decolorization rate in the degradation of AB-29 dye.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Victoria Bejenari, Alexandra Marcu, Alina-Mirela Ipate, Daniela Rusu, Nita Tudorachi, Ion Anghel, Ioana-Emilia Sofran, Gabriela Lisa
Summary: The study demonstrates that firelighters containing coffee grounds have superior combustion performance and can serve as an alternative utilization method. Additionally, these firelighters produce less residue and have a longer burning time.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Chemical
Xuelian Li, Saleem Raza, Changkun Liu
Summary: A novel biobased polymeric microsphere photocatalyst was developed for the degradation of dyes and antibiotics in wastewater. The microsphere photocatalyst exhibited high degradation efficiency, stability, and recyclability, with promising practical applications.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Chemistry, Applied
Mahmoud E. E. Awad, Amr M. M. Farrag, Ashraf A. A. El-Bindary, Mohamed A. A. El-Bindary, Hala A. A. Kiwaan
Summary: In this study, a simple technique for the production of TiO2-QDs-Kao photocatalyst was reported. The photocatalyst exhibited excellent degradation efficiency for RhB dye under visible light. The mechanism of photocatalytic degradation was based on the transport of electrons and holes. Additionally, the photocatalyst showed high stability and reusability.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Green & Sustainable Science & Technology
J. Rajesh Banu, R. Yukesh Kannah, M. Dinesh Kumar, Preethi, S. Kavitha, M. Gunasekaran, Guangyin Zhen, Mukesh Kumar Awasthi, Gopalakrishnan Kumar
Summary: Coffee consumption leads to the generation of large amounts of spent coffee grounds (SCG), which contains various valuable components. Valorisation of SCG through integrated biorefinery approach not only brings more valuable products, but also enhances environmental sustainability and economic benefits. The future perspective of SCG biorefinery shows the potential for higher production of bioactive compounds and bioenergy, contributing to the development of a circular bioeconomy.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)