scholarly journals Synthesis and Heavy-Metal Sorption Studies of N,N-Dimethylacrylamide-Based Hydrogels

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3084
Author(s):  
Ayatzhan Akhmetzhan ◽  
Nurgeldi Abeu ◽  
Sotirios Nik. Longinos ◽  
Ayezkhan Tashenov ◽  
Nurbala Myrzakhmetova ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Reaction Time ◽  
Radical Polymerization ◽  
Ammonium Persulfate ◽  
Adsorption Behavior ◽  
Metal Sorption ◽  
Initial Concentration ◽  
Swelling Degree ◽  
Heavy Metal Sorption ◽  
Hydrogel System

In this work, a hydrogel system was produced via radical polymerization of N,N-dimethylacrylamide and 2-acrylamido-2-methylpropanesulfonic acid in the presence of N,N-methylene-bis-acrylamide as a crosslinker and ammonium persulfate as an initiator. Parameters that impact the conversion of copolymerization (such as initial concentration of monomers, temperature, initiator dose, and time) were studied. The swelling degree of the hydrogel was investigated with the addition of a crosslinker and initiator at different pH levels. A hydrogel with high conversion and high swelling degree was selected to investigate their ability for adsorption of Pb(II) ions from solutions. Adsorption behavior of Pb(II) ions in a hydrogel was examined as a function of reaction time and concentration of lead ions from a solution of Pb(II) ions.

Biopolymer Encapsulation of PEI-Derivatives for Heavy Metal Sorption

2015 ◽  
Vol 1130 ◽  
pp. 529-532
Author(s):  
Caroline Bertagnolli ◽  
Thierry Vincent ◽  
Eric Guibal
Keyword(s):  
Electron Microscopy ◽  
Heavy Metal ◽  
Scanning Electron Microscopy ◽  
Composite Materials ◽  
Metal Sorption ◽  
Initial Concentration ◽  
Heavy Metal Sorption ◽  
Maximum Sorption ◽  
Complex Solutions ◽  
Scanning Electron

Composite materials have been synthesized by alginate or chitosan encapsulation of polyethylenimine (PEI) derivatives (obtained by glutaraldehyde grafting of histidine and carbon disulfide). Discrete or agglomerated PEI-derivative particles are immobilized in the macroporous network of biopolymer matrix (as shown by scanning electron microscopy and SEM-EDX analysis). The effect of pH and initial concentration on Zn (II) and Cu (II) sorption performance were analyzed. The incorporation of PEI-derivatives biopolymer matrix improves sorption performance in complex solutions (doped with CaCl2) compared to pristine biopolymer. Maximum sorption capacities range from 0.64 to 1 mmol L-1 for Zn (II) and from 1.13 to 1.67 mmol L-1 for Cu (II).

ASSESSING THE RELATIONS BETWEEN THE SURFACE PROPERTIES OF BIOCHARS AND HEAVY METAL SORPTION

2020 ◽  
Author(s):  
Amy Lam ◽  
◽  
Todd Longbottom ◽  
Nelli K. Bodiford ◽  
Omar R. Harvey
Keyword(s):  
Heavy Metal ◽  
Surface Properties ◽  
Metal Sorption ◽  
Heavy Metal Sorption

scholarly journals Heavy Metal Sorption by Sludge-Derived Biochar with Focus on Pb2+ Sorption Capacity at μg/L Concentrations

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1559
Author(s):  
Ida Sylwan ◽  
Hanna Runtti ◽  
Lena Johansson Westholm ◽  
Henrik Romar ◽  
Eva Thorin
Keyword(s):  
Experimental Data ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Sorption Capacity ◽  
Municipal Wastewater ◽  
Metal Removal ◽  
Metal Exposure ◽  
Isotherm Models ◽  
Metal Sorption ◽  
Heavy Metal Sorption

Municipal wastewater management causes metal exposure to humans and the environment. Targeted metal removal is suggested to reduce metal loads during sludge reuse and release of effluent to receiving waters. Biochar is considered a low-cost sorbent with high sorption capacity for heavy metals. In this study, heavy metal sorption to sludge-derived biochar (SDBC) was investigated through batch experiments and modeling and compared to that of wood-derived biochar (WDBC) and activated carbon (AC). The aim was to investigate the sorption efficiency at metal concentrations comparable to those in municipal wastewater (<1 mg/L), for which experimental data are lacking and isotherm models have not been verified in previous works. Pb2+ removal of up to 83% was demonstrated at concentrations comparable to those in municipal wastewater, at pH 2. SDBC showed superior Pb2+ sorption capacity (maximum ~2 mg/g at pH 2) compared to WDBC and AC (<0 and (3.5 ± 0.4) × 10−3 mg/g, respectively); however, at the lowest concentration investigated (0.005 mg/L), SDBC released Pb2+. The potential risk of release of other heavy metals (i.e., Ni, Cd, Cu, and Zn) needs to be further examined. The sorption capacity of SDBC over a metal concentration span of 0.005–150 mg Pb2+/L could be predicted with the Redlich–Peterson model. It was shown that experimental data at concentrations comparable to those in municipal wastewater are necessary to accurately model and predict the sorption capacity of SDBC at these concentrations.

Heavy metal sorption of compost materials

2007 ◽  
Vol 35 (2) ◽  
pp. 653-656 ◽  
Author(s):  
Noémi Kovács ◽  
György Füleky
Keyword(s):  
Heavy Metal ◽  
Metal Sorption ◽  
Heavy Metal Sorption

scholarly journals Bioflocculant production and heavy metal sorption by metal resistant bacterial isolates from gold mining soil

Chemosphere ◽  
2019 ◽  
Vol 231 ◽  
pp. 113-120 ◽  
Author(s):  
Ayansina Segun Ayangbenro ◽  
Olubukola Oluranti Babalola ◽  
Oluwole Samuel Aremu
Keyword(s):  
Heavy Metal ◽  
Gold Mining ◽  
Metal Sorption ◽  
Bacterial Isolates ◽  
Mining Soil ◽  
Heavy Metal Sorption
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