scholarly journals FABRICATION OF CELLULOSE-BASED CHITOSAN COATING ADSORBENTS FOR CAPTURE TO CADMIUM (II) AND ZINC (II)

2018 ◽  
Vol 55 (4C) ◽  
pp. 224
Author(s):  
Truong Thi Cam Trang
Keyword(s):  
Adsorption Capacity ◽  
Fiber Surface ◽  
Cellulose Fiber ◽  
Chitosan Coating ◽  
Enhanced Adsorption

Cellulose fiberous adsorbent (CCCF) was prepared from sugacane agasse by coating chitosan  on the fiber surface. The chitosan layer coated on the cellulose fiber enhanced adsorption to Cd2+ and Zinc2+. High efficency of the CCCF of removal % for the Cd (II) and Zn (II) was  with  93.7 % and 93.0 %, respectively and the adsorption capacity was 2.0 mg/g.

scholarly journals In-situ Preparation of Nano-calcium Carbonate/Cellulose Fiber Composite and Its Application in Fluff Pulp

2017 ◽  
Vol 12 (3) ◽  
pp. 155892501701200 ◽  
Author(s):  
Yongjian Xu ◽  
Chunmei Jiang ◽  
Chao Duan ◽  
Weipeng Zhang
Keyword(s):  
Hydrogen Bonding ◽  
Calcium Carbonate ◽  
Adsorption Capacity ◽  
Fiber Composite ◽  
Fiber Surface ◽  
Cellulose Fiber ◽  
Natural Polymers ◽  
Inorganic Particles ◽  
In Situ Preparation

Calcium carbonate/cellulose fiber composites combining natural polymers and inorganic particles are promising materials for preparing fluff pulp. In this study, calcium carbonate (CaCO3) particles were in-situ precipitated on cellulose fiber surfaces to decrease the level of hydrogen bonding. The results showed that nano CaCO3 particles precipitated and dispersed well on the fiber surface. The fluff pulp made from cellulose/CaCO3 modified fibers exhibited high effectiveness in the dry defibration process and good adsorption capacity due to the weak hydrogen bonding. The burst index of the handsheets decreased 31% (based on the ash content of 1.48 wt. %) without compromising the adsorption capacity of the fluff pulp.

scholarly journals Enhanced Adsorption of Bisphenol A from Aqueous Solution with 2-Vinylpyridine Functionalized Magnetic Nanoparticles

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1136 ◽  
Author(s):  
Qiang Li ◽  
Fei Pan ◽  
Wentao Li ◽  
Dongya Li ◽  
Haiming Xu ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Magnetic Nanoparticle ◽  
Maximum Adsorption Capacity ◽  
Salting Out ◽  
Functionalized Magnetic Nanoparticles ◽  
Ft Ir ◽  
Fe3o4 Nanospheres ◽  
Enhanced Adsorption

In this study, a novel 2-vinylpyridine functionalized magnetic nanoparticle (Mag-PVP) was successfully prepared. The prepared Mag-PVP was characterized by transmission electronic microscopy (TEM), Fourier transform infrared spectrophotometry (FT-IR), vibrating sample magnetometry (VSM) and thermogravimetric analysis (TGA), and was used for the adsorption of bisphenol A (BPA) from aqueous solutions. Mag-PVP, which is composed of Fe3O4 nanoparticles and poly divinylbenzene-2-vinylpyridine (with a thickness of 10 nm), exhibited magnetic properties (Ms = 44.6 emu/g) and thermal stability. The maximum adsorption capacity (Qm) of Mag-PVP for BPA obtained from the Langmuir isotherm was 115.87 mg/g at 20 °C, which was more than that of Fe3O4 nanospheres. In the presence of NaCl, the improved adsorption capacity of Mag-PVP was probably attributed to the screening effect of Mag-PVP surface charge and salting-out effect. In the presence of CaCl2 and humic acid (HA), the adsorption capacity of BPA decreased due to competitive adsorption. The adsorption of BPA by Mag-PVP increased slightly with the increase in pH from 3.0 to 5.0 and obtained the largest adsorption amount at pH 5.0, which was probably attributed to hydrogen bonding interactions. Moreover, in actual water, Mag-PVP still showed excellent adsorption performance in removing BPA. The high adsorption capacity and excellent reusability performance in this work indicated that Mag-PVP was an effective adsorbent for removing BPA from aqueous solutions.

Microwave carbonization of cotton fiber for the production of carbon materials

2021 ◽  
Vol 11 ◽  
pp. 54-68
Author(s):  
E. V. Matveev ◽  
◽  
A. I. Gajdar ◽  
B. A. Lapshinov ◽  
A. V. Mamontov ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Fiber Surface ◽  
Thermal Method ◽  
Surface Layers ◽  
Cotton Lint ◽  
Microwave Exposure ◽  
Carbonization Process ◽  
Fiber Wall ◽  
Physico Chemical ◽  
Transverse Fractures

This article presents the results of comparative studies of the structural and physico-chemical features of cotton lint samples carbonized by the microwave method and the standard (thermal) method. The dependences of the temperature change of the samples during the microwave carbonization process are obtained. The heterogeneity of the morphology of the fiber surface along the cross-section of the microwave carbonized sample was revealed. It is shown that the structure of the surface layers is characterized by two mechanisms of fiber destruction: numerous brittle transverse fractures and coloring of the fibers in places of swellings (a sharp increase in their diameter) and fluffing of the surface into convoluted fibrils with a transverse size of 50 – 300 nm due to the destruction of the outer layers of the secondary fiber wall. In the central region, the destruction of fibers occurs by the formation of longitudinal interfibrillary slits and the delamination of the secondary fiber wall, which leads to the formation of pores with dimensions of 50 – 200 nm. It is established that during the microwave carbonization process, the central part of the sample is almost completely freed from impurities that are deposited on the fibers of the surface layers. It is shown that the integral adsorption capacity of the microwave carbonized sample is higher than the adsorption capacity of the sample carbonized by the thermal method (126 mg/g and 47 mg/g, respectively). It was found that during microwave exposure more than 10 minutes, regions with an adsorption capacity of ~ 350 – 450 mg/g appear in the carbonized material, that is comparable to the capacity of samples activated by the standard method.

scholarly journals Mechanical Performance of Glass-Based Geopolymer Matrix Composites Reinforced with Cellulose Fibers

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2395 ◽  
Author(s):  
Gianmarco Taveri ◽  
Enrico Bernardo ◽  
Ivo Dlouhy
Keyword(s):  
Fly Ash ◽  
Mechanical Performance ◽  
Fiber Surface ◽  
Cellulose Fiber ◽  
Maximum Effect ◽  
Matrix Composites ◽  
Curing Conditions ◽  
Chevron Notch ◽  
Geopolymer Matrix ◽  
Mechanical Performances

Glass-based geopolymers, incorporating fly ash and borosilicate glass, were processed in conditions of high alkalinity (NaOH 10–13 M). Different formulations (fly ash and borosilicate in mixtures of 70–30 wt% and 30–70 wt%, respectively) and physical conditions (soaking time and relative humidity) were adopted. Flexural strength and fracture toughness were assessed for samples processed in optimized conditions by three-point bending and chevron notch testing, respectively. SEM was used to evaluate the fracture micromechanisms. Results showed that the geopolymerization efficiency is strongly influenced by the SiO2/Al2O3 ratio and the curing conditions, especially the air humidity. The mechanical performances of the geopolymer samples were compared with those of cellulose fiber–geopolymer matrix composites with different fiber contents (1 wt%, 2 wt%, and 3 wt%). The composites exhibited higher strength and fracture resilience, with the maximum effect observed for the fiber content of 2 wt%. A chemical modification of the cellulose fiber surface was also observed.

EFFECT OF CELLULOSE FIBER SURFACE TREATMENT TO REPLACE CARBON BLACK IN NATURAL RUBBER HYBRID COMPOSITES

2021 ◽  
Author(s):  
Hossein Kazemi ◽  
Frej Mighri ◽  
Keun Wan Park ◽  
Slim Frikha ◽  
Denis Rodrigue
Keyword(s):  
Carbon Black ◽  
Natural Rubber ◽  
Surface Treatment ◽  
Hybrid Composites ◽  
Tensile Modulus ◽  
Fiber Surface ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Infrared Spectrometry ◽  
Hybrid Filler

ABSTRACT In recent years, cellulose fibers have attracted considerable attention as biofillers for natural rubber (NR) composites. However, neat cellulose cannot be used as a substitute for conventional fillers due to its poor compatibility with NR. Therefore, a new surface treatment via maleic anhydride grafted to polyisoprene (MAPI) in solution was developed to improve the filler–matrix interaction. Different contents of carbon black (CB) and cellulose fibers (before and after modification) were used as a hybrid filler system to investigate the possibility of CB substitution in NR composites. First, contact angle, Fourier transformed infrared spectrometry (FTIR), and scanning electron microscopy (SEM) techniques were used to confirm the successful cellulose surface treatment. Second, morphological analysis, Payne effect, and swelling behavior of the rubber compounds in toluene confirmed the effect of cellulose treatment on improving the interfacial filler–matrix adhesion. Finally, the results showed that the composite filled with 20 phr modified cellulose and 20 phr CB (50% replacement of CB) exhibited even better results than the composite filled with 40 phr of CB, since the tensile strength was only 7% lower, but the elongation at break, tensile modulus at 100%, and storage modulus at 25 °C were respectively 35%, 24%, and 22% higher.

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