composite beads
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2022 ◽  
Vol 30 ◽  
pp. 103056
Author(s):  
Manel Bergaoui ◽  
Mohamed Khalfaoui ◽  
Manawwer Alam ◽  
Badis Guellou ◽  
Mohamed Chaker Belekbir ◽  
...  

Rare Metals ◽  
2022 ◽  
Author(s):  
Pan Duan ◽  
Duo-Yu Lin ◽  
Wei-Ting Yang ◽  
Xiao-Jing Huang ◽  
A-Hui Sun ◽  
...  

Nanomaterials ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 176
Author(s):  
Tong Luo ◽  
Yanping Hao ◽  
Chao Wang ◽  
Weikun Jiang ◽  
Xingxiang Ji ◽  
...  

A novel and effective green system consisting of deep eutectic solvent (DES) was proposed to prepare lignin nanoparticles (LNPs) without any lignin modification. The LNPs are obtained through the dialysis of the kraft lignin-DES solution. The particle size distribution, Zeta potential and morphology of the LNPs are characterized by using dynamic light scattering (DLS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The average diameter of LNPs is in the range 123.6 to 140.7 nm, and the LNPs show good stability and dispersibility in water. The composite beads composed of LNPs and sodium alginate (SA) are highly efficient (97.1%) at removing methylene blue (MB) from the aqueous solution compared to 82.9% and 77.4% by the SA/bulk kraft lignin composite and pure SA, respectively. Overall, the LNPs-SA bio-nanocomposite with high adsorption capacity (258.5 mg/g) could be useful in improving water quality and other related applications.


Author(s):  
Huan Xi ◽  
Xiaojuan Zhang ◽  
Ai Hua Zhang ◽  
Feng Guo ◽  
Yan Yang ◽  
...  
Keyword(s):  

Author(s):  
Amel Mekki ◽  
Mohammed Hachemaoui ◽  
Adel Mokhtar ◽  
Ismail Issam ◽  
Farid Bennabi ◽  
...  

2021 ◽  
Vol 129 (12) ◽  
pp. 753-760
Author(s):  
Dasong PENG ◽  
Xiaodong WANG ◽  
Yanchao REN ◽  
Xiaoqiang DU ◽  
Zhihua DAI
Keyword(s):  

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7187
Author(s):  
Maria Râpă ◽  
Anca Andreea Ţurcanu ◽  
Ecaterina Matei ◽  
Andra Mihaela Predescu ◽  
Mircea Cristian Pantilimon ◽  
...  

Massive amounts of industrial and agricultural water around the world are polluted by various types of contaminants that harm the environment and affect human health. Alginic acid is a very versatile green polymer used for heavy metal adsorption due to its availability, biocompatibility, low cost, and non-toxic characteristics. The aim of this paper was to prepare new low-cost hybrid composite beads using sodium alginate with treated montmorillonite and kaolin for the adsorption of copper (Cu) cations. Modified and unmodified clays were investigated by studying their morphology and elemental composition, functional groups, and mean particle size and particle size distribution. The characterization of alginate/clay hybrid composite beads was carried out by evaluating surface morphology (by scanning electron microscopy, SEM), crystallinity (by X-ray diffraction, XRD), and point of zero charge (pHpzc)(Zeta Potential Analyzer). Batch adsorption experiments of alginate/clay hybrid composite beads investigated the effect of metal concentration in the range of 1–4 mg L−1 on Cu(II) removal, adsorption kinetic for maximum 240 min, and Langmuir and Freundlich adsorption isotherms by using atomic absorption spectrometry. The pseudo-second-order kinetic model best fitted the adsorption for alginate/montmorillonite beads (R2 = 0.994), while the diffusion process was predominant for montmorillonite/kaolin beads (R2 = 0.985). The alginate/clay hybrid materials best fitted the Langmuir isotherm model.


Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4075
Author(s):  
Songtao Xiao ◽  
Menglin Li ◽  
Haifeng Cong ◽  
Lingyu Wang ◽  
Xiang Li ◽  
...  

Zirconium-based metal-organic frameworks (Zr-MOFs) have great structural stability and offer great promise in the application of gas capture. However, the powder nature of MOF microcrystallines hinders their further industrial-scale applications in fluid-phase separations. Here, Zr-based DUT-68 was structured into nontoxic and eco-friendly alginate beads, and the gas capture properties were evaluated by CO2 and volatile iodine. DUT-68 beads were synthesized via a facile and versatile cross-linked polymerization of sodium alginate with calcium ions. The composite beads keep the structural integrity and most of the pore accessibility of DUT-68. The resulting DUT-68@Alginate (2:1) porous bead processes a surface area of 541 m2/g and compressive strength as high as 1.2 MPa, and the DUT-68 crystals were well-dispersed in the alginate networks without agglomeration. The DUT-68@Alginate bead with a 60% weight ratio of MOFs exhibits a high carbon dioxide capacity (1.25 mmol/g at 273 K), as well as an excellent high adsorption capacity for iodine, reaching up to 0.65 g/g at 353 K. This work provides a method to construct thiophene-contained composite beads with millimeter sizes for the capture of gases in potential industrial applications.


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