Magnetic Fe/C catalysts from coconut husk to the cyclohexene oxidation to adipic acid

Chitosan beads with colloidal silver nanoparticles inclued in the polymer matrix have been obtained by the introduction of chitosan into an acidified nanosilver sol. Dual interconnection of drops of the resulting solution was then carried out by ionotropic gelation at the first stage and covalent crosslinking of the polymer matrix with adipic acid at the second stage. The surface morphology of the obtained beads was studied by scanning electron microscopy. Data of Fourier transform IR spectroscopy confirmed the formation of covalent bonds between chitosan and adipic acid. The antibacterial activity of obtained beads against S. aureus and E. coli was evaluated using agar diffusion test. It was shown that the сhitosan beads modified with nanostructured silver exhibited an antibacterial effect against the tested strains, and they can be used as a basis for creating biodegradable wound healing dressings with a prolonged antibacterial effect. chitosan, silver nanoparticles, antibacterial activity, wound dressings This work was supported by the "Russian Academic Excellence Project 5-100". The study was carried out with the financial support of the Russian Foundation for Basic Research in the framework of the Scientific Project no. 18-29-18039.

Download Full-text

Green synthesis of ZnO coated hybrid biochar for the synchronous removal of ciprofloxacin and tetracycline in wastewater

RSC Advances ◽

10.1039/d1ra01130h ◽

2021 ◽

Vol 11 (30) ◽

pp. 18483-18492

Author(s):

Abisola O. Egbedina ◽

Kayode O. Adebowale ◽

Bamidele I. Olu-Owolabi ◽

Emmanuel I. Unuabonah ◽

Morenike O. Adesina

Keyword(s):

Green Synthesis ◽

Microwave Technique ◽

Coconut Husk

Preparation of biochar from kaolinite and coconut husk (KCB) and further activated with HCl (KCB-A) and KOH (KCB-B) via a microwave technique for the remediation of ciprofloxacin (CIP) and tetracycline (TET) from water was carried out.

Download Full-text

Potential of Biochar Derived from Agricultural Residues for Sustainable Management

Sustainability ◽

10.3390/su13158147 ◽

2021 ◽

Vol 13 (15) ◽

pp. 8147

Author(s):

Sasiwimol Khawkomol ◽

Rattikan Neamchan ◽

Thunchanok Thongsamer ◽

Soydoa Vinitnantharat ◽

Boonma Panpradit ◽

...

Keyword(s):

Chemical Properties ◽

Agricultural Residues ◽

Hydroxyl Groups ◽

Asian Countries ◽

Heating Value ◽

Coconut Husk ◽

High Heating Value ◽

Horizontal Drum ◽

Physical And Chemical ◽

And Chemical Properties

A horizontal drum kiln is a traditional method widely used in Southeast Asian countries for producing biochar. An understanding of temperature conditions in the kiln and its influence on biochar properties is crucial for identifying suitable biochar applications. In this study, four agricultural residues (corncob, coconut husk, coconut shell, and rice straw) were used for drum kiln biochar production. The agricultural residues were turned into biochar within 100–200 min, depending on their structures. The suitability of biochar for briquette fuels was analyzed using proximate, ultimate, and elemental analysis. The biochar’s physical and chemical properties were characterized via bulk density, iodine number, pHpzc, SEM, and FTIR measurements. All biochars had low O/C and H/C ratios and negative charge from both carbonyl and hydroxyl groups. Coconut husk and shell biochar had desirable properties such as high heating value and a high amount of surface functional groups which can interact with nutrients in soil. These biochars are thus suitable for use for a variety of purposes including as biofuels, adsorbents, and as soil amendments.

Download Full-text

Physico-Mechanical Properties of Particle Board made from Coconut Shell, Coconut Husk and Palm Kernel Shell

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1107/1/012131 ◽

2021 ◽

Vol 1107 (1) ◽

pp. 012131

Author(s):

O. D. Atoyebi ◽

O. J. Aladegboye ◽

F. O. Fatoki

Keyword(s):

Mechanical Properties ◽

Palm Kernel ◽

Coconut Shell ◽

Particle Board ◽

Palm Kernel Shell ◽

Coconut Husk

Download Full-text

Designing of Green Plasticizers and Assessment of the Effectiveness of Their Use

Polymers ◽

10.3390/polym13111761 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1761

Author(s):

Aliya K. Mazitova ◽

Guliya K. Aminova ◽

Irina N. Vikhareva

Keyword(s):

Adipic Acid ◽

Polymer Materials ◽

Operational Parameters ◽

Solid Domestic Waste ◽

Polymer Waste ◽

Synthetic Materials ◽

Environmental Requirements ◽

Potential Methods ◽

High Set ◽

Acid Esters

The growing anthropogenic load on the lithosphere is currently characterized by the alienation of huge areas for solid domestic waste. One of the most common pollutants is traditional plastics with a degradation period of over 100 years. In connection with the increasing environmental requirements, polymer materials, along with a high set of technological and operational parameters, must be environmentally friendly and biodegradable. The development of polymer composite materials that undergo accelerated physicochemical and biological changes in the natural environment due to the introduction of biodegradable additives is one of the potential methods for processing synthetic materials and ensures the release of significant areas of fertile soils and lands from the steadily increasing amount of polymer waste. The use of adipic acid esters as PVC plasticizers contributes to the production of biodegradable composites. The article describes a method for obtaining new esters of adipic acid, presents the results of studying their properties for practical use in PVC composites, and assesses the economic efficiency of preventing damage to the environment when using them.

Download Full-text