In Situ Coprecipitation Formed Highly Water-Dispersible Magnetic Chitosan Nanopowder for Removal of Heavy Metals and Its Adsorption Mechanism

2018 ◽  
Vol 6 (12) ◽  
pp. 16754-16765 ◽  
Author(s):  
Shengyan Pu ◽  
Yaqi Hou ◽  
Chun Yan ◽  
Hui Ma ◽  
Hongyan Huang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Adsorption Mechanism ◽  
Magnetic Chitosan ◽  
Water Dispersible ◽  
Removal Of Heavy Metals

scholarly journals Sawdust for the Removal of Heavy Metals from Water: A Review

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4318
Author(s):  
Elie Meez ◽  
Abbas Rahdar ◽  
George Z. Kyzas
Keyword(s):  
Heavy Metals ◽  
Adsorption Mechanism ◽  
Freundlich Isotherm ◽  
Order Kinetic ◽  
Suitable Material ◽  
Removal Of Heavy Metals ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
And Control ◽  
Environmental Agencies

The threat of the accumulation of heavy metals in wastewater is increasing, due to their abilities to inflict damage to human health, especially in the past decade. The world’s environmental agencies are trying to issue several regulations that allow the management and control of random disposals of heavy metals. Scientific studies have heavily focused on finding suitable materials and techniques for the purification of wastewaters, but most solutions have been rejected due to cost-related issues. Several potential materials for this objective have been found and have been compared to determine the most suitable material for the purification process. Sawdust, among all the materials investigated, shows high potential and very promising results. Sawdust has been shown to have a good structure suitable for water purification processes. Parameters affecting the adsorption mechanism of heavy metals into sawdust have been studied and it has been shown that pH, contact time and several other parameters could play a major role in improving the adsorption process. The adsorption was found to follow the Langmuir or Freundlich isotherm and a pseudo second-order kinetic model, meaning that the type of adsorption was a chemisorption. Sawdust has major advantages to be considered and is one of the most promising materials to solve the wastewater problem.

Removal of Heavy Metals by Poly(Vinyl Pyrrolidone)/Laponite Nanocomposite Hydrogels

2013 ◽  
Vol 631-632 ◽  
pp. 291-297
Author(s):  
Yan Ming Wang ◽  
Da Ji Shang ◽  
Zhong Wei Niu
Keyword(s):  
Heavy Metals ◽  
Freeze Drying ◽  
In Situ Polymerization ◽  
Ion Concentration ◽  
Vinyl Pyrrolidone ◽  
Potential Candidate ◽  
Nanocomposite Hydrogels ◽  
Removal Of Heavy Metals ◽  
Poly Vinyl Pyrrolidone

Laponite cross-linked poly(vinyl pyrrolidone) (PVP) hydrogels were fabricated by in situ polymerization of vinyl pyrrolidone (NVP). Macroporous PVP/Laponite nanocomposite hydrogels were obtained by freeze drying of hydrogels, which exhibited faster adsorption kinetics than ambient-dried ones. We also investigated the influence of laponite content, initial ion concentration and pH of the solution on the adsorption capacity of PVP/Laponite hydrogels. Moreover, the PVP/Lapnoite hydrogels can further be fabricated into powder hydrogel samples, which can be used as a potential candidate of adsorbent for removal of heavy metals in water.

Preparation of cross-linked magnetic chitosan particles from steel slag and shrimp shells for removal of heavy metals

2017 ◽  
Vol 39 (14) ◽  
pp. 1745-1752 ◽  
Author(s):  
Le Van Thuan ◽  
Tran Bao Chau ◽  
Tran Thi Kieu Ngan ◽  
Tran Xuan Vu ◽  
Dinh Duc Nguyen ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Steel Slag ◽  
Magnetic Chitosan ◽  
Shrimp Shells ◽  
Removal Of Heavy Metals

scholarly journals Heterogeneous biochars from agriculture residues and coal fly ash for the removal of heavy metals from coking wastewater

RSC Advances ◽  
2019 ◽  
Vol 9 (28) ◽  
pp. 16018-16027 ◽  
Author(s):  
Lihui Gao ◽  
Jillian L. Goldfarb
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Wheat Straw ◽  
Adsorption Mechanism ◽  
Coal Fly Ash ◽  
Coking Wastewater ◽  
Chemical Adsorption ◽  
Agriculture Residues ◽  
Removal Of Heavy Metals

Heterogeneous biochar via pyrolysis of wheat straw and fly ash with chemical adsorption mechanism; cobalt shows higher capacity and rate.

Removal of heavy metals from simulated wastewater by in situ formation of layered double hydroxides

2016 ◽  
Vol 306 ◽  
pp. 1035-1040 ◽  
Author(s):  
Francisco R. Peligro ◽  
Ivana Pavlovic ◽  
Ricardo Rojas ◽  
Cristobalina Barriga
Keyword(s):  
Heavy Metals ◽  
Layered Double Hydroxides ◽  
Removal Of Heavy Metals ◽  
Simulated Wastewater ◽  
In Situ Formation ◽  
Double Hydroxides

scholarly journals Simultaneous removal of heavy metals and biodegradation of organic matter with sediment microbial fuel cells

RSC Advances ◽  
2017 ◽  
Vol 7 (84) ◽  
pp. 53433-53438 ◽  
Author(s):  
M. S. Wu ◽  
X. Xu ◽  
Q. Zhao ◽  
Z. Y. Wang
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Simultaneous Removal ◽  
Removal Of Heavy Metals

To in situ remediate rivers polluted by organic matter and heavy metals, lab-scale sediment microbial fuel cells (SMFCs) were operated under different conditions.

scholarly journals Nanomagnetic Polymeric Absorbent Based on Alginate and Gamma-Maghemite Synthesized In Situ for Wastewater Treatment from Metallurgical Industry

2021 ◽  
Author(s):  
Ivana Lourenço de Mello Ferreira ◽  
Rodrigo Ferreira Bittencourt ◽  
Clenilson Sousa Júnior
Keyword(s):  
Heavy Metals ◽  
Adsorption Mechanism ◽  
Kinetic Studies ◽  
Metallurgical Industry ◽  
Crosslinking Reaction ◽  
Maghemite Nanoparticles ◽  
Transmission Electron ◽  
Iron And Calcium ◽  
Industry Wastewater

A nanomagnetic absorbent based on calcium alginate was produced successfully with the maghemite nanoparticles synthesized in situ, i.e., together with the polysaccharide crosslinking reaction. Physicochemical properties of the absorbent were analyzed and its ability to remove Ni(II) and Mn(II) ions from a real metallurgical industry wastewater was evaluated. Kinetic studies of the adsorption of these heavy metals were realized. To ascertain the most suitable quantity of absorbent to remove Ni(II) and Mn(II) from the wastewater, the absorbent mass was varied and adsorption kinetics was also evaluated. The competitiveness between the metals was evaluated to understand the adsorption mechanism. The samples were characterized by transmission electron microscopy, vibrating sample magnetometry, X-ray diffractometry and Mössbauer spectroscopy. The absorbent prepared, in this work, can be classified as a hydrogel. It presented predominant spherical morphology and micrometric dimension, containing atoms of iron and calcium dispersed uniformly in their internal and external surfaces. The synthesized maghemite nanoparticles presented superparamagnetic behavior. Results showed that the adsorption equilibrium time for both ions was about 60 min. The removal percentages from wastewater were 60.5% for nickel and 56.6% for manganese, using 300 mg of hydrogel. Results revealed that the adsorption mechanism is by ionic change between calcium and heavy metals.

scholarly journals IN SITU AND EX SITU BIOREMEDIATION OF HEAVY METALS: THE PRESENT SCENARIO

2021 ◽  
Vol 29 (4) ◽  
pp. 454-469
Author(s):  
Oindrila Paul ◽  
Amrita Jasu ◽  
Dibyajit Lahiri ◽  
Moupriya Nag ◽  
Rina Rani Ray
Keyword(s):  
Heavy Metals ◽  
Gene Editing ◽  
Ex Situ ◽  
The Past ◽  
Effective Removal ◽  
Removal Of Heavy Metals ◽  
Recent Developments ◽  
Polluted Sites ◽  
Rapid Industrialization

Enhanced population growth, rapid industrialization, urbanization and hazardous industrial practices have resulted in the development of environmental pollution in the past few decades. Heavy metals are one of those pollutants that are related to environmental and public health concerns based on their toxicity. Effective bioremediation may be accomplished through “ex situ” and “in situ” processes, based on the type and concentration of pollutants, characteristics of the site but is not limited to cost. The recent developments in artificial neural network and microbial gene editing help to improve “in situ” bioremediation of heavy metals from the polluted sites. Multi-omics approaches are adopted for the effective removal of heavy metals by various indigenous microbes. This overview introspects two major bioremediation techniques, their principles, limitations and advantages, and the new aspects of nanobiotechnology, computational biology and DNA technology to improve the scenario.

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