Article
Green & Sustainable Science & Technology
W. Ding, H. Liu, X. Hao, L. Dong, X. Pang, Z. Ding
Summary: Waste collagen fiber from non-chrome metal complex tanned leather shavings was converted to a bio-additive (DCH) via catalytic peroxide oxidation. This DCH improved the performance of biomass-derived aldehyde tanned chrome-free leather and showed filling effects, better dyeing uniformity, mechanical strengths, and organoleptic properties.
MATERIALS TODAY SUSTAINABILITY
(2022)
Article
Engineering, Environmental
Zonghui Zhang, Yadi Hu, Fang Wang, Xuejing Zheng, Jie Liu, Keyong Tang
Summary: The management and safe disposal of chrome-tanned leather wastes is crucial due to potential health risks and environmental hazards. This study proposes an integrated strategy for disposing of these wastes, involving the separation of chromium salts for recycling and pyrolysis of the acid-treated waste. The results provide useful information on the composition, morphology, and kinetics of the waste, offering an alternative route for recycling and disposing of chrome-containing leather wastes.
Article
Engineering, Environmental
Hua Long, Xiaolu Huang, Yang Liao, Jidong Ding
Summary: The study found that factors such as calcination environment and organic compounds in the materials have significant impact on the recovery of Cr (VI) from Ts and CTLs. By utilizing a segmented calcination method with Na2CO3 as a catalyst, the recovery of Cr (VI) can be effectively increased.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Jiri Pecha, Michaela Barinova, Karel Kolomaznik, Thanh Nhu Nguyen, Anh Tuan Dao, Van Thi Le
Summary: A mathematical model was developed to simulate the technological process for the utilization of chrome shavings, including the quantitative description of the reaction rate dependence on enzyme concentration. Optimization of enzyme concentration can significantly reduce processing costs and improve profitability.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Materials Science, Composites
Shulong Zeng, Yao Ren, Pengju Liu, Qiang Wang, Lirong He, Qi Wang
Summary: This study introduces a method to utilize leather solid wastes via solid-state shear milling technology, resulting in the preparation of composite materials with excellent mechanical properties.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Review
Polymer Science
Mariafederica Parisi, Alessandro Nanni, Martino Colonna
Summary: Tanneries generate large amounts of solid and liquid wastes, containing harmful chemical compounds like chromium, posing potential threats to the environment and human health. Currently, the scientific and industrial communities are working towards finding sustainable and innovative alternatives for waste management and disposal.
Article
Chemistry, Multidisciplinary
W. Ding, S. Guo, H. Liu, X. Pang, Z. Ding
Summary: The amino-terminated waterborne polyurethane-based polymeric dye (AWPUD) was successfully synthesized for dyeing chrome-free leather tanned by biomass-derived aldehyde (BAT). AWPUD showed better dyeing performances compared to small-molecule dyes (SMDs) in terms of dye penetration degree, chroma of wastewater, and filler-dye uptake ratio, as well as improved dyeing uniformity, rubbing resistance, and thermal stability.Overall, AWPUD has the potential to be used in high-performance dyeing of BAT-tanned leather, offering superior physical properties.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Engineering, Environmental
K. Patchai Murugan, S. Sabarinathan, N. Prabhakaran, S. Swarnalatha
Summary: Highly stable semiconducting, photocatalytic Cr2O3/carbon/TiO2 composites were successfully synthesized from toxic chrome-tanned buffing dust. The presence of Cr2O3 and TiO2 were confirmed through XRD and XPS analysis. The Cr2O3/carbon/TiO2 composite showed higher degradation activity compared to TiO2 and Cr2O3/carbon materials, attributed to the generation of hydroxyl radicals.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Patchai Murugan Karmegam, Prabhakaran Natarajan, Swarnalatha Somasundaram
Summary: Porous chromium oxide containing semiconducting carbon was synthesized from chrome-containing tannery waste. The role of activating agents in imparting semiconducting property and changes in surface chemistry were investigated. Different characterization techniques demonstrated the unique properties of the synthesized photocatalysts. The ACS material showed a low bandgap and better crystal planes, while the ACK material exhibited a high surface area.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Biotechnology & Applied Microbiology
Marieli Rosseto, Cesar Vinicius Toniciolli Rigueto, Daniela Dal Castel Krein, Lillian Avila Massuda, Naiana Pereira Balbe, Luciane Maria Colla, Aline Dettmer
Summary: This study aimed to enhance the properties of films produced from corn starch and gelatin recovered from CTLW by adding TGase and PESP. Significant improvements were achieved in water solubility and vapor permeability, as well as positive effects on soil covering.
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2021)
Article
Engineering, Chemical
V. V. Severov, I. V. Filippova, L. O. Filippov
Summary: This research conducted flotation studies on fine-grained apatite-bearing tailings from the Kovdor concentration plant. It found that tall oil fatty acids in combination with polyoxy-ethylene cetyl ether (2 EO groups) can be an alternative for nonylphenol ethoxylates, achieving high P2O5 recovery and concentrate grade.
MINERALS ENGINEERING
(2022)
Article
Chemistry, Applied
Song Guo, Wei Ding, Xiaoyan Pang, Zhiwen Ding
Summary: In this study, a modified dye was prepared by introducing an active dye onto the surface of graphene oxide (GO) and successfully applied in the dyeing of chrome-free leather, improving its color fastness to sunlight. The modified dye showed similar uptake ratios and color rendering properties compared to the original dye, and did not affect the leather's uptake of dye. Additionally, the dyed leather exhibited improved UV-shielding performance.
JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION
(2023)
Article
Agronomy
Noluthando Noxolo Aruwajoye, Asanda Mditshwa, Lembe Samukelo Magwaza, Mjabuliseni Simon Cloapas Ngidi, Samson Zeray Tesfay
Summary: This study assessed the impact of ethephon treatment on fatty acids and dietary indicators in macadamia nuts. Results showed that ethephon treatment increased saturated fatty acid levels and reduced unsaturated fatty acid levels, potentially impacting nutritional quality negatively.
Article
Microbiology
Guan-Yu Fang, Li-Juan Chai, Xiao-Zhong Zhong, Zhen-Ming Lu, Xiao-Juan Zhang, Lin-Huan Wu, Song-Tao Wang, Cai-Hong Shen, Jin-Song Shi, Zheng-Hong Xu
Summary: In this study, comparative genomic analysis was performed on pit mud-associated (PMA) and non-pit mud-associated (NPMA) Clostridium strains. Genes related to the metabolism of starch, ethanol, and lactic acid were found to be enriched in PMA Clostridium strains, facilitating their adaptation to the unique brewing environment. In addition, horizontal gene transfer contributed to the adaptation of Clostridium to pit mud. Our findings provide genetic insights on PMA Clostridium strains' ecological adaptation and metabolic characteristics.
Article
Agricultural Engineering
G. Shailaja, T. Bhavya, K. Sandeepa, K. N. Prasanna Rani, T. Prathap Kumar
Summary: This study proposes a simple method for removing free fatty acids from unrefined vegetable oils using reactive extraction with monoethanolamine in methanol. The study investigates the kinetic parameters and establishes the reaction regime for the extraction process. The results show that reactive extraction is highly effective in reducing the free fatty acid content in jatropha oil. Biodiesel prepared from the deacidified oil meets the ASTM standards.
BIOMASS & BIOENERGY
(2023)
Article
Chemistry, Applied
A. Y. Esmat, R. E. Hassan, G. A. Abo-ElWafa, M. M. Abou-ElSoud, M. G. Megahed
Article
Biochemistry & Molecular Biology
Salah A. A. Mohamed, Mohamed El-Sakhawy, EL-Shahat H. A. Nashy, Abdelmageed M. Othman
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2019)
Article
Chemistry, Applied
S. F. Hamed, G. A. Abo-Elwafa
Article
Chemistry, Applied
H. Abd El-Wahab, Farouk Abd El-Monem, M. A. Naser, A. I. Hussain, Elshhat H. A. Nashy, L. Lin
PIGMENT & RESIN TECHNOLOGY
(2020)
Article
Environmental Sciences
M. A. El-Khateeb, E. H. A. Nashy, Abdel-Aziz A. Nayl
Summary: The tanning industry causes significant damage and pollution to the environment by generating tanning effluents and solid waste. An integrated treatment system utilizing chemical coagulation with DHNW reactor showed efficient removal of COD, BOD, and TSS in the effluent, meeting regulatory standards for discharge.
WASTE AND BIOMASS VALORIZATION
(2021)
Article
Biochemistry & Molecular Biology
Minar Mahmoud M. Hassanein, Adel Gabr Abdel-Razek, Sherine Mohamed Affifi, Ying Qian, Elzbieta Radziejewska-Kubzdela, Aleksander Siger, Magdalena Rudzinska, Ghada Ahmed Abo-Elwafa, Anna Grygier
Summary: This study investigated the effects of roasting linseeds on the pigment, lipid profile, bioactive components, and oxidative stability of extracted oils. The results showed that roasting increased the oil percentage and peroxide value, as well as chlorophyll and total phenolics content. However, it had minimal impact on omega-3 fatty acids and phytosterol composition. Roasting also enhanced the stability of the extracted oils.
Article
Food Science & Technology
Adel G. Abdel-Razek, Ghada A. Abo-Elwafa, Eman F. Al-Amrousi, Ahmed N. Badr, Minar Mahmoud M. Hassanein, Ying Qian, Aleksander Siger, Anna Grygier, Elzbieta Radziejewska-Kubzdela, Magdalena Rudzinska
Summary: This study investigates the impact of refining on the quality and stability of fractionated and mixed shea butters. The results show that refining reduces peroxide value and free fatty acid content, but decreases antibacterial and antifungal activities. The main fatty acids in shea butter are stearic and oleic acid.
Article
Chemistry, Multidisciplinary
Abd El -Nasser A. Khattab, Ali Abou-Shosha, Aya A. Abozaid, Gomaah B. El-Fadly
Summary: Bacterial isolates from the soil of the botanical garden in Egypt showed high levels of CGTase activity. The superior Bacillus strain WT3 was classified as Bacillus hunanensis. Mutants of WT3 were created using EMS, and the best mutant for CGTase biosynthesis was WT3-60-8. Protoplast fusions between mutants WT3-60-4 and WT3-60-8 resulted in fusant F1-8 with significantly improved CGTase activity. DNA fingerprints using RAPD showed different banding patterns, and the genetic backgrounds of the mutants and fusants were analyzed based on genetic distances.
EGYPTIAN JOURNAL OF CHEMISTRY
(2023)
Article
Engineering, Chemical
El-Shahat H. A. Nashy, Adel M. A. Elhadad, M. A. El-Khateeb
Summary: The adsorption process is an effective method for treating wastewater, and the use of waste materials as adsorbents can reduce costs and protect the environment. This research focuses on using solid waste from tanneries as adsorbents for industrial wastewater treatment. The study successfully reduced the chemical and biochemical oxygen demand of the wastewater to meet regulatory standards.
DESALINATION AND WATER TREATMENT
(2022)
Article
Chemistry, Multidisciplinary
T. Y. Mansour El-Ashkar, EL-Shahat H. A. Nashy, Ragab A. Masoud, Ahmed A. Harown, M. Adel Youssef, Amira E. M. Abdallah
Summary: Effective management of tannery effluent is crucial, and the study utilized an advanced oxidation technique based on modification of the Fenton reaction combined with high porous nanomaterials to effectively treat the effluent and meet national regulatory standards.
EGYPTIAN JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Farouk Abd El-Monem, Ahmed Hussen, H. Abd El-Wahab, EL-Shahat H. A. Nashy, A. M. Naser
Summary: The retanning process aims to fill the pores of already tanned leather with vegetable or synthetic tannins or polymers, in order to improve fullness and final product properties, while reducing the environmental impact of chrome tanning. The use of polymer/nanosilica hybrid emulsions as a modern retanning agent shows potential in enhancing physical, thermal, and mechanical properties of the leather, as well as reducing environmental impact. The study discusses the effects of organic nano-silica content on the properties of the retanned leather.
EGYPTIAN JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Ahmed A. Haroun, Fathallah A. Ayoob, El-Shahat H. A. Nashy, Ola A. Mohamed, Abdel-Gawad M. Rabie
EGYPTIAN JOURNAL OF CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Fathalla A. Ayoob, Ahmed A. Haroun, El-Shahat H. A. Nashy, Ola A. Mohamed, S. Abdel-Shafy, Abdel-Gawad M. Rabie
EGYPTIAN JOURNAL OF CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
S. F. Hamed, T. N. Soliman, L. K. Hassan, Ghada A. Abo-Elwafa
EGYPTIAN JOURNAL OF CHEMISTRY
(2019)
Article
Chemistry, Multidisciplinary
El-Shahat H. A. Nashy, Kamal A. Eid
EGYPTIAN JOURNAL OF CHEMISTRY
(2019)