Tea waste is an important part of agricultural solid wastes, because of its various sources and huge amount. The heavy metals removal from waste water by tea waste has been paid much attention by the researchers around the world, owing to the adsorption characteristic of tea waste. In this paper, the research advances in the heavy metals removal from aqueous phase by tea waste were summarized from the aspects of affecting factors, adsorption mechanism, pretreatment, desorption, and regeneration, and the prospects were put forward. It was considered that for the industrialized utilization of tea waste absorbents, further researches should be focused on their adsorption mechanism, pretreatment, desorption and regeneration, technological parameters, and after treatment.
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J Biotechnol
January 2025
Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy. Electronic address:
This study explores the immobilization of lipase from Candida rugosa (CRL) on hemp tea waste to catalyze the esterification of oleic acid with primary aliphatic C2-C12 alcohols. in a solvent-free system. The immobilization method employed was adsorption, chosen for its simplicity, low cost, and ability to preserve enzyme activity.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
Hainan Key Laboratory of Storage & Processing of Fruits and Vegetables, Agricultural Products Processing Research Institute of Chinese Academy of Tropical Agricultural Sciences, Zhanjiang 524001, China. Electronic address:
Manufacturing water-stable carboxymethyl cellulose (CMC) films as an alternative to commercial plastics is a promising solution to address plastic pollution. In this study, waste walnut shell (WS) was used as a natural lignocellulosic filler, glycerol as a plasticizer, and citric acid (CA) as a crosslinking agent for preparing high-performance CMC-based bioplastics through a one-pot casting method. When WS content was 12 wt%, the obtained CWGA-12 after optimization exhibited excellent mechanical properties (tensile strength ≈18.
View Article and Find Full Text PDFFood Chem X
January 2025
Department of Food Technology and Nutrition, School of Agriculture, Lovely Professional University, Phagwara, 144411, India.
The study focused on converting tea bag waste into strong fluorescence carbon quantum dots (TBW-CQDs) for the detection of acrylamide in drinking water, antimicrobial activity, and photocatalytic degradation. The TBW-CQDs exhibited blue luminescence and maximum absorbance at 287 nm under UV light and distinctive fluorescence emission and excitation wavelengths at 425 nm and 287 nm, respectively. TBW-CQDs revealed a particle size of 8.
View Article and Find Full Text PDFSci Rep
January 2025
Department of Food and Nutrition Sciences, College of Agricultural and Food Sciences, King Faisal University, Al Ahsa, 31982, Saudi Arabia.
The spent black tea extract was utilized in order to synthesize the spent black tea silver nanoparticles (SBT-AgNPs). Various parameters were tested to yield the best production of SBT-AgNPs. The characterization was conducted by X-Ray diffraction, Scanning electron microscopy, Zeta potential and energy dispersive X-ray (EDX).
View Article and Find Full Text PDFMaterials (Basel)
January 2025
Faculty of Technology Novi Sad, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia.
Herbal dust, a waste byproduct from filter-tea production, was annealed to form ash that can be incorporated into natural rubber as an eco-friendly filler. Three types of herbal dust ash (HDA), green tea, hibiscus, and lemon balm, were added at two different contents, 2.5 and 5 phr, into the rubber compound, while the content of carbon black, as a filler, was maintained at 50 phr in all samples.
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