In Situ Synthesized Hydroxyapatite—Cellulose Nanofibrils as Biosorbents for Heavy Metal Ions Removal

Narwade, Vijaykiran N.; Khairnar, Rajendra S.; Kokol, Vanja

doi:10.1007/s10924-017-1101-7

Cited by 41 publications

(26 citation statements)

References 66 publications

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“…On the other hand, the XRD patterns of HA-TCNF/CNC nanocomposites (Figure 3b-e) showed a weak peak at 2θ of around 22.6 • , which was characteristic for the cellulose (Figure 3a), and relatively sharp peaks at 2θ between 25 • and 35 • corresponding to the HA with the Miller indices (hkl) at the (201), (211), (300), and (310) planes, according to the JCPDS-861199 [44,53] database. The lower peaks in the composites (Figure 3b-e) were observed for Ca(OH) 2 (according to the JCPDS-841276 database) at around 46.9 • , 49.4 • , and 53.1 • .…”

Section: Structure Morphology and Thermal Stability Of The Nanocompmentioning

confidence: 98%

“…However, other studies [59,60] reflect that cellulose OHgroups do not have a high enough reactivity to grow calcium phosphate crystals, due to significantly weak interactions between negative partial atomic charges of oxygen atoms of OHgroups and positive calcium ions (ion-polar interactions) that probably cannot compensate for entropy losses. In the case of the nanocomposites spectra (Figure 2c-f), the absence or very weak cellulose peaks were observed at around 3342, 2926, 1604, 1316, 1160, and 1060 cm -1 , indicating that the surfaces of the nanocellulose were probably completely covered with the HA crystals [53]. In addition, increases of the bands at around 1440 cm -1 and 870 cm -1 corresponding to the carbonate (CO 3 2-) groups in the crystal lattice of the HAp [57], being shifted slightly to around 1423 and 897 cm -1 , respectively, and being more intensive in the case of the nanocomposites with a lower nanocellulose content (HACNC10 and HATCNF10), may present an ionic substitute for PO 4 3− in the apatite crystal of the HA.…”

Section: Structure Morphology and Thermal Stability Of The Nanocompmentioning

confidence: 98%

“…The FTIR spectra ( Figure 2) of the HA-TCNF/CNC composites demonstrate typical spectral lines for the HA and the cellulose. The spectrum of the synthesized HA ( Figure 2a) reveals specific peaks at around 560 and 601 cm -1 , corresponding to the phosphate group (PO 4 3-) bending vibration [52,53].…”

Section: Structure Morphology and Thermal Stability Of The Nanocompmentioning

confidence: 99%

“…The intense and sharp absorption band observed at around 1028 cm -1 resembled the symmetric and asymmetric stretching of phosphate, while the bands observed at around 870 and 1440 cm -1 originated from the carbonate groups (CO3 2-) in the crystal lattice of the HA. Representative cellulose vibration bands were also identified within the TCNF spectral line as shown in Figure 2b [53]. The glucose ring related to the C-O bond at around 1060 cm -1 , the -OH vibrations region at around 3342 cm −1 , and the C-H stretching vibrations at around 2926 cm −1 , as well as the antisymmetric bridge of the C-O-C stretching and the skeletal vibrations of the C-O stretching at around 1160 and 1115 cm −1 , respectively.…”

Section: Structure Morphology and Thermal Stability Of The Nanocompmentioning

confidence: 99%

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Mechanical Properties and Cytotoxicity of Differently Structured Nanocellulose-hydroxyapatite Based Composites for Bone Regeneration Application

et al. 2019

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The nanocomposites were prepared by synthesizing (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO)-oxidized cellulose nanofibrils (TCNFs) or cellulose nanocrystals (CNCs) with hydroxyapatite (HA) in varying composition ratios in situ. These nanocomposites were first obtained from eggshell-derived calcium and phosphate of ammonium dihydrogen orthophosphate as precursors at a stoichiometric Ca/P ratio of 1.67 with ultrasonication and compressed further by a uniaxial high-pressure technique. Different spectroscopic, microscopic, and thermogravimetric analyses were used to evaluate their structural, crystalline, and morphological properties, while their mechanical properties were assessed by an indentation method. The contents of TCNF and CNC were shown to render the formation of the HA crystallites and thus influenced strongly on the composite nanostructure and further on the mechanical properties. In this sense, the TCNF-based composites with relatively higher contents (30 and 40 wt %) of semicrystalline and flexible TCNFs resulted in smoother and more uniformly distributed HA particles with good interconnectivity, a hardness range of 550–640 MPa, a compression strength range of 110–180 MPa, an elastic modulus of ~5 GPa, and a fracture toughness value of ~6 MPa1/2 in the range of that of cortical bone. Furthermore, all the composites did not induce cytotoxicity to human bone-derived osteoblast cells but rather improved their viability, making them promising for bone tissue regeneration in load-bearing applications.

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Section: Structure Morphology and Thermal Stability Of The Nanocompmentioning

confidence: 98%

Section: Structure Morphology and Thermal Stability Of The Nanocompmentioning

confidence: 98%

Section: Structure Morphology and Thermal Stability Of The Nanocompmentioning

confidence: 99%

Section: Structure Morphology and Thermal Stability Of The Nanocompmentioning

confidence: 99%

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Mechanical Properties and Cytotoxicity of Differently Structured Nanocellulose-hydroxyapatite Based Composites for Bone Regeneration Application

et al. 2019

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“…Photocatalytic dye degradation does not require any extra effort for treating waste water. This technology requires material with high stability, non-toxicity, photo-generating radical characteristic and wide band gap [10][11][12][13][14][15][16]. Binary metal oxides (such as ZnO, TiO 2 , ZrO 2 , etc) have wide band-gap energy, whichresults in recombination of photo-generated electron-hole pairs leading to low photocatalytic activity [5].…”

Section: Introductionmentioning

confidence: 99%

Remarkable photocatalytic degradation of Remazol Brilliant Blue R dye using bio-photocatalyst ‘nano-hydroxyapatite’

Begum

Narwade

Halge

et al. 2020

Mater. Res. Express

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Nanostructured bio-photocatalyst hydroxyapatite (HAp) was synthesized by a simple and productive wet chemical precipitation method to explore the photocatalytic performance of the material for degradation of Remazol Brilliant Blue R (RBBR) dye. Wet chemically synthesized nano-HAp was characterized through x-ray diffraction, Transmission electron microscope, scanning electron microscope, N 2 -adsorption-desorption, thermo gravimetric analyzer, Fourier transform infrared and UV-vis absorption techniques. Photocatalytic degradation of RBBR under ultraviolet irradiation was examined and ∼80% degradation was achieved in 120 min by using nano-HAp. The photocatalytic degradation followed Parabolic Diffusion kinetics. Fast degradation kinetics and removal of RBBR dye was achieved by nano-HAp due to modification of surface entities leading to suppression of photogenerated electron-hole recombination. This makes nano-HAp a remarkable bio-photocatalyst material for removing dyes from water.

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Polymer brushes on graphene oxide for efficient adsorption of heavy metal ions from water

Liu

Ding

Chi

et al. 2019

J of Applied Polymer Sci

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The pollution of heavy metal ions in water poses a serious threat to human being and ecosystems. Here, we report polyamidoxime (PAO) brush grafted graphene oxide (GO) as a highly efficient adsorbent for extraction of toxic metal cations from water. Surface-initiated atom transfer radical polymerization was used to grow polyacrylonitrile (PAN) brushes on GO, followed by conversion of the nitrile groups in PAN into amidoxime groups, which had high binding affinity toward heavy metal cations. The PAO brush grafted GO demonstrated significantly fast adsorption kinetics and large adsorption capacity. At optimal pH 5, the PAO brush grafted GO can achieve maximum adsorption capacities of 116.7 mg g −1 for Pb(II), 258.6 mg g −1 for Ag(I), 192.2 mg g −1 for Cu(II), and 167.9 mg g −1 for Fe(III), which were significantly larger than those of small molecule functionalized GO. Mechanism analysis suggested that the enhanced adsorption performance was due to the myriads of functional groups in PAO brushes that were easily accessible to metal ions because of the swelling of the polymer brushes in water.

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In Situ Synthesized Hydroxyapatite—Cellulose Nanofibrils as Biosorbents for Heavy Metal Ions Removal

Cited by 41 publications

References 66 publications

Mechanical Properties and Cytotoxicity of Differently Structured Nanocellulose-hydroxyapatite Based Composites for Bone Regeneration Application

Mechanical Properties and Cytotoxicity of Differently Structured Nanocellulose-hydroxyapatite Based Composites for Bone Regeneration Application

Remarkable photocatalytic degradation of Remazol Brilliant Blue R dye using bio-photocatalyst ‘nano-hydroxyapatite’

Polymer brushes on graphene oxide for efficient adsorption of heavy metal ions from water

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