Adsorptive catalysis of hierarchical porous heteroatom-doped biomass: from recovered heavy metal to efficient pollutant decontamination

2018 ◽  
Vol 6 (34) ◽  
pp. 16690-16698 ◽  
Author(s):  
Jing Wang ◽  
Qingfeng Yang ◽  
Weixia Yang ◽  
Hanna Pei ◽  
Liang Zhang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Selective Adsorption ◽  
Metal Recovery ◽  
Hierarchical Porous ◽  
Recovery And Reuse

Hierarchical porous heteroatom-doped biomass integrates enhanced selective adsorption for heavy metal recovery and reuse in catalytic pollutant decontamination.

scholarly journals Effects of Electronegativity and Hydration Energy on the Selective Adsorption of Heavy Metal Ions by Synthetic NaX Zeolite

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4066
Author(s):  
Xianyuan Fan ◽  
Hong Liu ◽  
Emmanuella Anang ◽  
Dajun Ren
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Heavy Metal Ions ◽  
Binary Systems ◽  
Adsorption Mechanism ◽  
Selective Adsorption ◽  
Hydration Energy ◽  
Nax Zeolite ◽  
High Electronegativity

The adsorption capacity of synthetic NaX zeolite for Pb2+, Cd2+, Cu2+ and Zn2+ in single and multi-component systems were investigated. The effects of electronegativity and hydration energy on the selective adsorption, as well as potential selective adsorption mechanism of the NaX zeolite for Pb2+, Cd2+, Cu2+ and Zn2+ were also discussed. The maximum adsorption capacity order of the heavy metals in the single system was Pb2+ > Cd2+ > Cu2+ > Zn2+, and this could be related to their hydration energy and electronegativity. The values of the separation factors (α) and affinity constant (KEL) in different binary systems indicated that Pb2+ was preferentially adsorbed, and Zn2+ presented the lowest affinity for NaX zeolite. The selective adsorption capacities of the metals were in the order, Pb2+ > Cd2+ ≈ Cu2+ > Zn2+. The trend for the selective adsorption of NaX zeolite in ternary and quaternary systems was consistent with that in the binary systems. Pb2+ and Cu2+ reduced the stability of the Si-O-Al bonds and the double six-membered rings in the NaX framework, due to the high electronegativity of Pb2+ and Cu2+ than that of Al3+. The selective adsorption mechanism of NaX zeolite for the high electronegative metal ions could mainly result from the negatively charged O in the Si-O-Al structure of the NaX zeolite, hence heavy metal ions with high electronegativity display a strong affinity for the electron cloud of the oxygen atoms in the Si-O-Al. This study could evaluate the application and efficiency of zeolite in separating and recovering certain metal ions from industrial wastewater.

Spontaneous nanoparticle formation coupled with selective adsorption in magadiite

2017 ◽  
Vol 5 (8) ◽  
pp. 4144-4149 ◽  
Author(s):  
W. T. Lim ◽  
J.-H. Jang ◽  
N.-Y. Park ◽  
S.-M. Paek ◽  
W.-C. Kim ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Selective Adsorption ◽  
Metal Cations ◽  
Nanoparticle Formation ◽  
Heavy Metal Cations

The adsorbed heavy metal cations were spontaneously and systematically transformed into the corresponding hydroxide nanoparticles exclusively on the crystal edges and the nanoparticles ultimately sprouted out of the crystals on full growth.

scholarly journals The Fabrication of Calcium Alginate Beads as a Green Sorbent for Selective Recovery of Cu(Ⅱ) from Metal Mixtures

Crystals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 255 ◽  
Author(s):  
Niannian Yang ◽  
Runkai Wang ◽  
Pinhua Rao ◽  
Lili Yan ◽  
Wenqi Zhang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Calcium Alginate ◽  
Selective Adsorption ◽  
Optical Emission ◽  
Alginate Beads ◽  
Emission Spectrometry ◽  
Sorption Behavior

Calcium alginate (CA) beads as a green sorbent were easily fabricated in this study using sodium alginate crosslinking with CaCl2, and the crosslinking pathway was the exchange between the sodium ion of α-L-guluronic acid and Ca(II). The experimental study was conducted on Cu(II), Cd(II), Ni(II) and Zn(II) as the model heavy metals and the concentration was determined by inductively coupled plasma optical emission spectrometry (ICP-OES). The characterization and sorption behavior of the CA beads were analyzed in detail via using scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The adsorption experiments demonstrated that the CA beads exhibited a high removal efficiency for the selective adsorption of Cu(II) from the tetra metallic mixture solution and an excellent adsorption capacity of the heavy metals separately. According to the isotherm studies, the maximum uptake of Cu(II) could reach 107.53 mg/g, which was significantly higher than the other three heavy metal ions in the tetra metallic mixture solution. Additionally, after five cycles of adsorption and desorption, the uptake rate of Cu(II) on CA beads was maintained at 92%. According to the properties mentioned above, this material was assumed to be applied to reduce heavy metal pollution or recover valuable metals from waste water.

scholarly journals Three hierarchical porous magnesium borate microspheres: a serial preparation strategy, growth mechanism and excellent adsorption behavior for Congo red

RSC Advances ◽  
2019 ◽  
Vol 9 (35) ◽  
pp. 20009-20018 ◽  
Author(s):  
Rui-Feng Guo ◽  
Yan-Qing Ma ◽  
Zhi-Hong Liu
Keyword(s):  
Growth Mechanism ◽  
Congo Red ◽  
Selective Adsorption ◽  
High Adsorption ◽  
Magnesium Borate ◽  
Adsorption Performance ◽  
Adsorption Capacities ◽  
Hierarchical Porous ◽  
Porous Magnesium ◽  
Preparation Strategy

Three 3D hierarchical porous 7MgO·2B2O3·7H2O and 3MgO·B2O3 microspheres assembled by nanosheets have been prepared by a serial preparation strategy. They exhibited excellent selective adsorption performance for Congo red with high adsorption capacities.

scholarly journals Insight into the Synergistic Effect on Selective Adsorption for Heavy Metal Ions by a Polypyrrole/TiO2Composite

Langmuir ◽  
2018 ◽  
Vol 34 (34) ◽  
pp. 10187-10196 ◽  
Author(s):  
Jie Chen ◽  
Mengting Yu ◽  
Caiyun Wang ◽  
Jiangtao Feng ◽  
Wei Yan
Keyword(s):  
Heavy Metal ◽  
Synergistic Effect ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Selective Adsorption ◽  
Insight Into
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