JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
·
2024
·
IF 3.2
Wysocki Łukasz,Adamczuk Patrycja,Bardadyn Paula,Gabor Anna,Jelonek Karolina,Kudelska Monika,Kukuć Maksymilian,Piasek Adrianna,Pietras Marta,Słomka Monika,Trojan Zoja,Tybulczuk Wiktoria,Sobiepanek Anna,Żylińska-Urban Joanna,Cieśla Joanna
Spent coffee grounds (SCG) are commercial waste that are still rich in numerous valuable ingredients and can be further processed into useful products such as coffee oil, antioxidant extract, lactic acid, and lignin. The challenge and innovation is to develop the SCG processing technology, maximizing the use of raw material and minimizing the use of other resources within the sequential process. The presented research is focused on the aspect of biotechnological production of lactic acid from SCG by using the Lacticaseibacillus rhamnosus strain isolated from the environment. Thanks to the optimization of the processes of acid hydrolysis, neutralization, enzymatic hydrolysis of SCG, and fermentation, the obtained concentration of lactic acid was increased after 72 hr of culture from the initial 4.60 g/l to 48.6 g/l. In addition, the whole process has been improved, taking into account the dependence on other processes within the complete SCG biorefinery, economy, energy, and waste aspects. Costly enzymatic hydrolysis was completely eliminated, and it was proven that supplementation of SCG hydrolysate with expensive yeast extract can be replaced by cheap waste from the agri-food industry.One-Sentence SummaryA process for efficient lactic acid production from spent coffee grounds using the Lacticaseibacillus rhamnosus strain was developed and optimized, including nutrient solution preparation, supplementation and fermentation.
研究领域:
生物技术
·
环境科学
·
食品科学
✓ 已验证
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2022
·
IF 7.129
Yixuan Liang,Hanbing Li,Xiaotong Li,Qiyu Zhang,Jiaying Fei,Sumei Li,Sha Chen
Around 6.6 million tons of spent coffee is produced per year, resulting in resources loss and potential environmental risks. Hence, a green technique is required to reuse the spent coffee grains. In this study, coffee grounds were burnt at 900 °C to generate the biochar (BC) for the synthesis of the porous adsorbent (ZIF-8 @BC) by growing ZIF-8 on the surface of BC. We applied the well-prepared ZIF-8 @BC to remove Congo red (CR) in water. The maximum adsorption capacity of ZIF-8 @BC on Congo red in water was up to 1080.4 mg/g, which was significantly higher than that of many different types of BCs reported in previous studies. The reasons for its highly efficient adsorption of CR probably was attributed to metal ions and coordinatively unsaturated sites in the material. Also, BC enabled the less aggregation of ZIF-8 to provide sufficient specific surface area for CR adsorption. From the analysis of the pseudo-second-order kinetic model and Langmuir model, the adsorption of ZIF-8 @BC on CR was a homogeneously chemical adsorption process regulated by electrostatic interaction, π-π stacking and metal coordination.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 10
·13581-13587
·
IF 2.478
Chen Junzhe,Du Haiying,Xu Yifeng,Ma Boyu,Zheng Zhihong,Li Pengchan,Jiang Yuqiu
Carbon quantum dots (CQDs) were synthesized by coffee grounds as the carbon source under hydrothermal carbonization treatment for the first time. The obtained turn-on CQDs showed a strong emission at the wavelength of 460 nm, with an optimum excitation of 370 nm, and enrichment of the surface functional groups (–OH, –NH 2 ). Sodium cyclamate in an aqueous solution and the turn-on CQDs could form a core–shell structure by hydrogen bonding and van der waals bonding to enhance the fluorescent emission. With such a design, turn-on CQD-based fluorescence detection techniques towards sodium cyclamate could be realized. Under optimal conditions, a linear relationship was found in the range of 2.8–56 µmol/L sodium cyclamate with the detection limit (3 δ/k ) of 3.16 µmol/L which is lower than the national standard detection limit of 49.7 µmol/L. The sensitive method has a great application prospect in detection of sodium cyclamate in real samples owing to its low detection limit, simplicity and rapidity.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Tianyu Yang,Yue Zhou,Jiamin Qi,Bin Li,Zewei Liu
Discharging pollutants containing toxic metal ions has become a global problem, and improper disposal of coffee grounds can also cause environmental pollution. In this work, 1T-MoS 2 @STC (Solvothermal Carbonization, STC) was prepared from coffee grounds and molybdenum disulfide by a one-step solvothermal method that is simple in operation, low in energy consumption and low in cost, which possesses efficient adsorption of Cr (VI) in wastewater. The 1T-MoS 2 @STC was characterized by SEM, TEM, XRD, XPS, Zeta potential, FTIR, and BET analyses. The results showed that MoS 2 was successfully loaded on coffee grounds. According to the pseudo-second order (R 2 = 0.99) kinetics model, chemisorption was the main cause of adsorption. The adsorption process followed the Langmuir (R 2 = 0.99) isothermal model, and the maximum adsorption capacity was 795.17 mg/g. The adsorption mechanism can be attributed to electrostatic interaction, redox reaction between Cr (VI) and active sites, and chelation between Cr (III) and hydroxyl. When 1T-MoS 2 @STC was applied to the treatment of actual water samples, the removal rate was also maintained at a high level (90%). In addition, 1T-MoS 2 @STC can maintain long-term stability (90 days) and low leaching of molybdenum (<3 mg/L) in wastewater. Therefore, in the treatment of chromium-containing wastewater, the 1T-MoS 2 @STC composite material simultaneously exhibited significant adsorption capacity, high interference resistance, stability and low leaching rate. This study provides a new efficient and stable Cr (VI) adsorbent and promotes the practical application of MoS 2 biomass derivatives composites in water purification.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2025
·
IF 0
Al-Ghamdi Azza A.,Ibrahim Sherif M.,Lu Xingmei,Xin Jiayu,El-Sayed Ibrahim El-Tantawy,Galhoum Ahmed A.,Wageh Swelm.
A sustainable biosorbent, silver nanoparticles-decorated coffee-ground waste (CWAg), was synthesized through a simple in-situ reduction method. CWAg is extensively characterized via SEM–EDX, PZC, FTIR, XRD, HR-TEM, and XPS analyses. The biosorbent was tested to remove chromium (Cr(VI)) and methylene blue (MB) from wastewater, and its antibacterial properties was evaluated. CWAg demonstrated efficient sorption efficiencies, achieving ⁓149.9 mg/g at 323 K and pH: 2.0 for Cr(VI) and ⁓113.4 mg/g at 293 K and pH: 6.0 for MB, at a biosorbent dose of 1 g/L. The equilibration times were 90 and 120 min for Cr(VI) and MB, with half-sorption times (t HST ) of 9.2 and 13.9 min, respectively. The sorption mechanisms were successfully fitted with Sips isotherm and Pseudo-second-order models. Simultaneous sorption of MB and Cr(VI) at pH 2.0 exhibited antagonism, while a synergistic effect was observed at pH 6.0. Desorption and regeneration were achieved using NaOH and HCl solutions for Cr(VI) and MB, respectively. The efficiencies were just reduced by 9–13%. Finally, CWAg exhibited remarkable effectiveness for removing Cr(VI) from complex tannery effluent. Moreover, CWAg demonstrated positive antibacterial effects against both Gram-positive and Gram-negative bacteria, surpassing raw coffee-ground waste, underscoring the significant role of silver nanoparticles in enhancing bacterial inhibition.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Li Zhili,Jiang Tianxiang,Huo Hanxin,Zhang Yizhong,Wang Xunliang,Guo Jian,Ma Yuhui
The facile fabrication of low-cost adsorbents possessing high removal efficiency and convenient separation property is an urgent need for water treatment. Herein, magnetic activated carbon was synthesized from spent coffee grounds (SCG) by Fe-catalyzed CO 2 activation at 800 °C for 90 min, and magnetization and pore formation were simultaneously achieved during heat treatment. The sample was characterized by N 2 adsorption–desorption, XRD, VSM, SEM, and FTIR. Batch adsorption experiments were conducted using lomefloxacin (LMO) as the probing pollutant. Preparation mechanism was revealed by TG-FTIR and XRD. Experimental results showed that Fe 3 O 4 derived from Fe species can be reduced to Fe by carbon at high temperatures, followed by subsequent reoxidation to Fe 3 O 4 by CO 2 , and the redox cycle between Fe and Fe 3 O 4 favored the formation of pores. The promotion effects of Fe species on CO 2 activation can be quantitatively reflected by the yield of CO as the signature gaseous product, and the suitable activation temperate range was determined to be 675 to 985 °C. The BET surface area, total pore volume, and saturated magnetization value of the product were 586 m 2 g −1 , 0.327 cm 3 g −1 , and 11.59 emu g −1 , respectively. The Langmuir model was applicable for the adsorption isotherm data for LMO with the maximum adsorption capacity of 95 mg g −1 , and thermodynamic analysis revealed that the adsorption process was endothermic and spontaneous. This study demonstrated that Fe-catalyzed CO 2 activation was an effective method of converting SCG into magnetic separable adsorbent for LMO removal from aqueous medium.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jiawei Tong,Guangfen Li,Jinxiang Wei,Chunqing Li
Here, a novel approach for preparing PDA@SC adsorbents by chemically modifying spent coffee grounds with citric acid and polydopamine was proposed. Citric acid concentration (0.6–1.5 M) and dopamine polymerization time (6–18 h) were used as reaction factors in the study and were combined with each other to obtain optimal reaction conditions. The adsorbents obtained under optimized conditions were characterized by scanning electron microscopy, Fourier infrared spectroscopy, thermalgravimetric analysis and X-ray photoelectron spectroscopy. Maximum adsorption capacities of PDA@SC towards cationic dyes were found as 1361.5 and 291 mg g −1 for Malachite green (MG) and Methylene blue (MB), respectively. The removal of each dye in the real water systems exceeds 75 %. Especially, a selectively removal of MG from mixed dye solutions with cationic MG and anionic Methyl orange reached beyond 97.5 %. The adsorption capacity of PDA@SC also displayed an increase/decrease with pH (4−10)/NaCl (CaCl 2 ) concentration (0.01–0.07 M), and the adsorbent maintained above 62 % removal after five cycles of adsorption-desorption, showing good resistance to solution pH, salinity and outstanding recyclability. The adsorption process is verified as a spontaneous and exothermic process which complies with pseudo-second-order and Langmuir models. The adsorption mechanism explored that electrostatic interaction, π-π conjugates and pore filling are predominant effects. The advantages of feasible route, eco-friendly and high efficiency make PDA@SC a desirable adsorbent for the applications in dye wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Zhuoning Xu,Chunyu Ji,Ting Wang,Qian Ding,Yifeng Wang,Han Yang
Solar-driven photothermal water evaporation offers a promising alternative for fresh water production, necessitating efficient and sustainable photothermal materials. Spent coffee grounds, an abundant biowaste, are a potential biomass-based evaporation material for this application, though limited by relatively low evaporation efficiency and the need for additional materials. Here, we present a hydrothermal-treated spent coffee grounds (DA-CGs) that contains carbon dots with strong photothermal conversion abilities, serving as an efficient solar evaporation material. Additionally, this material can also reduce water evaporation enthalpy by promoting intermediate water formation, while their hierarchical structures enhance sunlight trapping and expands the liquid-vapor interface. These features collectively contribute to their high efficiency in solar-driven water evaporation. The DA-CGs evaporator demonstrated a high evaporation rate of 2.45 kg m −2 h −1 for pure water under 1 sun and an outdoor daily water yield of 7.14 kg m −2 when purifying seawater. These advantages highlight its potential for large-scale water purification and provide valuable insights into utilizing biowaste for efficient solar water evaporation.
研究领域:
环境科学
·
材料科学
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Guijun Li,Jingqi Sha,Lingtao Sun,Rong Jin,Tiantian Fu,Yang Xiang,Yibo Tang,Ying Lei,Yujun Si,Chaozhong Guo
A nitrogen-doped carbon-based catalyst (Fe-C-CG) to oxygen reduction reaction (ORR) is synthesized by pyrolyzing a precursor from coffee grounds, iron chloride and commercial carbon black in ammonia atmosphere. The coffee grounds are pyrolyzed to carbon particles with diameters about 20 nm with the facilitation of carbon black. The carbon nanoparticles show higher reactive activity with ammonia to achieve the doping of nitrogen atoms to carbon with 3.33 at% of content in Fe-C-CG, which is greater than 0.47 at% in the product from commercial carbon black (Fe-C). Resultantly, the Fe-C-CG exhibits high ORR activity with 0.87 V of half wave potential and 5.48 mA cm −2 of limited diffusion current, which highly surpass the 0.71 V, 4.19 mA cm −2 for Fe-C, and are comparable with 0.86 V and 4.52 mA cm −2 for Pt/C catalyst, respectively. The Zn-air battery assembled with Fe-C-CG delivers 142 mW cm −2 of maximum power density and 774 mAh g −1 Zn of specific capacity, and can stably work at 1.212–1.257 V of discharge voltage at 10 mA cm −2 . This work provides a strategy to prepare a nonprecious metal and nitrogen doped carbon catalyst to ORR by using biomass as the basic material.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 14
·5137
·
IF 3.4
Yanling Jin,Jiayi Wang,Xin Gao,Fang Ren,Zhengyan Chen,Zhenfeng Sun,Penggang Ren
Titanium dioxide (TiO2) is an ideal photocatalyst candidate due to its high activity, low toxicity and cost, and high chemical stability. However, its practical application in photocatalysis is seriously hindered by the wide band gap energy of TiO2and the prone recombination of electron-hole pairs. In this study, C, N doped TiO2were supported on spent coffee grounds-derived carbon (ACG) via in situ formation, which was denoted as C, N–TiO2@ACG. The obtained C, N–TiO2@ACG exhibits increased light absorption efficiency with the band gap energy decreasing from 3.31 eV of TiO2to 2.34 eV, a higher specific surface area of 145.8 m2/g, and reduced recombination rates attributed to the synergistic effect of a spent coffee grounds-derived carbon substrate and C, N doping. Consequently, the optimal 1:1 C, N–TiO2@ACG delivers considerable photocatalytic activity with degradation efficiencies for methylene blue (MB) reaching 96.9% within 45 min, as well as a high reaction rate of 0.06348 min−1, approximately 4.66 times that of TiO2(0.01361 min−1). Furthermore, it also demonstrated greatly enhanced photocatalytic efficiency towards methyl orange (MO) in the presence of MB compared with a single MO solution. This work provides a feasible and universal strategy of synchronous introducing nonmetal doping and biomass-derived carbon substrates to promote the photocatalytic performance of TiO2for the degradation of organic dyes.Keywords:titanium dioxide;spent coffee grounds–derived carbon;C, N doping;photocatalytic degradation;organic dyes;dye mixture
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Bioengineering
·
2023
·Vol. 2
·期 3
·212-222
·
IF 0
Salimata Yakubu,Hui Zheng,Jingwen Chen,Francis K. Amagloh,Jingge Xu,Xiaohan Chen,Li Wang,Li Li
The study aimed to develop an active packaging, functionalized by spent coffee grounds extracts (SCGE) to preserve cake. The antioxidant extracts were obtained using three extraction methods: conventional extraction (CE), ultrasound-assisted extraction (UAE), and microwave-assisted extraction (MAE). The SCGE obtained with UAE and MAE produced the highest total phenolic contents and antioxidant activities, and were incorporated into bilayer films composed of polylactic acid, konjac glucomannan, and wheat gluten. The SCGE improved the film's antioxidant activity (8.40 to 90. 56%) and oxygen transmission rate (5.05 ± 0.04 to 2.22 ± 0.13). Active packaging with microwave extracts was more effective in preserving cake's lipids than the ultrasound extracts as measured by the peroxide value, thiobarbituric acid, and acid value during 21 days of storage. Overall, the study demonstrates the potential safe utilization of coffee waste in active packaging.
研究领域:
食品科学
·
材料科学
·
包装工程
✓ 已验证
DOI
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Ishioma Laurene Egun,Yang Hou,Zhengfei Chen
Zinc Supercapatteries (ZnSCs) are promising, low-cost and environmentally friendly electrochemical energy storage devices, with biomass-derived carbon showing promising results as its positrode active material. However, achieving sustainable biomass-derived carbon via a simple, single-stage and low-temperature process with properties for optimum electrochemical performance is still a challenge. In this study, we show that ultramicroporous and self-doped carbon which are critical electrode properties can be obtained from wet waste coffee grounds via a single-stage thermal process termed molten base carbonization and activation. The process integrates carbonization, in-situ activation and self-doping in one thermal step, driven by the catalytic reactivity of intercalated potassium ion within various components. Temperature control during the process resulted to changes in the microstructure, hierarchical porosity, oxygen and nitrogen functionalities affecting electrochemical performance. The carbon obtained at 700 °C (CGZ-700) as positive electrode active material in Zinc supercapattery achieved specific capacity of 361 mAh g −1 , specific capacitance of 204F g −1 at 0.1 A g −1 , alongside a specific energy and power of 91.99 Wh kg −1 and 89.99 W kg −1 . At 1.0 A g −1 , it achieved a coulombic efficiency of 99.8 % and 78 % capacity retention after 10,000 cycles. This study offers a facile, low temperature single-stage thermal conversion process for low-cost waste biomass, advancing the application of waste-derived carbon in ZnSCs and sustainable energy storage devices.
研究领域:
材料科学
·
环境科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）