scholarly journals Photocatalytic and Adsorptional Removal of Heavy Metals from Contaminated Water using Nanohybrids

2021 ◽  
pp. 113-160
Author(s):  
A. Guleria
Keyword(s):  
Water Pollution ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Heavy Metal Ions ◽  
Fundamental Principle ◽  
Polluted Water ◽  
Aquatic Life ◽  
Removal Of Heavy Metals ◽  
Heavy Metal Ions Removal

Water contaminated with heavy metals is a major menace for aquatic life and human health consequently its efficient removal remains a crucial challenge for researcher. The utilization of various photocatalytic nanohybrids to synergistically photo-reduce and adsorb heavy metals is a potent strategy to combat water pollution. This book chapter give an overview of the fundamental principle of photocatalysis and various single, binary, ternary and quaternary nanohybrids employed for simultaneous photoreduction and adsorption of heavy metals with its mechanistic insight. Further, conclusion and future prospective as well as limitation of available nanohybrids were addressed. We hope that this book chapter dispenses some noticeable information to heavy metal ions removal from polluted water.

scholarly journals Removal of Heavy Metals from Water and Wastewater Using Moringa oleifera

2021 ◽  
Author(s):  
Eman Noori Ali
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Moringa Oleifera ◽  
Press Cake ◽  
Removal Of Heavy Metals ◽  
Moringa Oleifera Leaves ◽  
Heavy Metal Ions Removal ◽  
Metal Ions Removal

One of the contaminants in wastewater is the heavy metals. Treatment of heavy metals is of great importance because they can be harmful and dangerous for human being health. Conventional removal methods used include: ultrafiltration, reverse osmosis, ion exchange, solvent extraction, sedimentation, and chemical precipitation, and each method has some disadvantages besides high costs. In this chapter, Moringa oleifera cake residue, Moringa oleifera press cake, and Moringa oleifera leaves are introduced as a proposed alternative to replace conventional methods for heavy metal ions’ removal. The results of using Moringa oleifera cake residue showed that iron (Fe) was fully removed; copper (Cu) and cadmium (Cd) were successfully removed up to 98% and reduction of lead (Pb) of 82.17%. The heavy metals were successfully reduced using Moringa oleifera press cake. The removal percentage of iron, copper, and chromium reached 69.99%, 88.86%, and 93.73%, respectively. Moringa oleifera leaves were used to remove Cd (II) from synthetic water; the optimization was performed and each parameter was affecting the Cd (II) removal with different percentages, but pH was insignificant. As a conclusion, the Moringa oleifera seeds and leaves can be considered as a promising alternative in water treatment for heavy metal ions removal.

Environmental Amelioration Using Aquatic Macrophytes: Emphasizing Removal of Heavy Metals from Waste Water

2016 ◽  
Vol 5 (6) ◽  
pp. 244-250
Author(s):  
Anindita Mitra ◽  
Soumya Chatterjee
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Heavy Metal ◽  
Toxic Metals ◽  
Aquatic Macrophytes ◽  
Polluted Water ◽  
Pollution Level ◽  
Primary Role ◽  
Aquatic Life ◽  
Removal Of Heavy Metals

Pollution of the aquatic environment with toxic metals has been attracting considerable attention over the past decades and increasing urbanization, industrialization and overpopulation are the main cause. Due to this toxic pollutant the global water crisis is one of the most serious problems facing by the humanity today as also plants and animals are very sensitive to the presence of these toxic metals. Phytoextraction is the most cost effective and environment friendly way to solve the problem of heavy metal pollution by using plants. Macrophytes are important component of aquatic communities due to their roles in oxygen production, nutrient cycling, water quality control, sediment stabilization to provide habitat and shelter for aquatic life and also for being considered efficient heavy metal accumulators. The main route of heavy metal uptake is through their roots in emergent and surface floating plants whereas, leafy submerged plants uptake heavy metals both through roots and leaves. Roots of wetland plants play the primary role in wastewater purification followed by stems and leaves. Aquatic macrophytes therefore are very useful for the treatment of wastewater to mitigate variety of pollution level and now are the important research issues all over the world. In this review an effort has been made to summarize the role of aquatic macrophytes in the removal of heavy metals from the polluted water to improve the water quality.

scholarly journals A New Ex Vivo Model to Evaluate the Hair Protective Effect of a Biomimetic Exopolysaccharide against Water Pollution

Cosmetics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 78
Author(s):  
Claire Tubia ◽  
Alfonso Fernández-Botello ◽  
Jan Dupont ◽  
Eni Gómez ◽  
Jérôme Desroches ◽  
...  
Keyword(s):  
Water Pollution ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Adverse Effects ◽  
Inductively Coupled Plasma ◽  
Ex Vivo ◽  
Polluted Water ◽  
Ex Vivo Model ◽  
Fiber Damage ◽  
The Impact

As an external appendage, hair is exposed to multiple stresses of different origins such as particles and gases in air, or heavy metals and chemicals in water. So far, little research has addressed the impact of water pollution on hair. The present study describes a new ex vivo model that allowed us to document the adverse effects of water pollutants on the structure of hair proteins, as well as the protective potential of active cosmetic ingredients derived from a biomimetic exopolysaccharide (EPS). The impact of water pollution was evaluated on hair from a Caucasian donor repeatedly immersed in heavy metal-containing water. Heavy metal retention in and on hair was then quantified using Inductively Coupled Plasma Spectrometry (ICP/MS). The adverse effects of heavy metals on the internal structure of hair and its prevention by the EPS were assessed through measurement of keratin birefringence. Notably, the method allows the monitoring of the organization of keratin fibers and therefore the initial change on it in order to modulate the global damage in the hair. Results revealed an increasing amount of lead, cadmium and copper, following multiple exposures to polluted water. In parallel, the structure of keratin was also altered with exposures. However, heavy metal-induced keratin fiber damage could be prevented in the presence of the tested EPS, avoiding more drastic hair problems, such as lack of shine, or decrease in strength, due to damage accumulation.

scholarly journals A systematic study for removal of heavy metals from aqueous media using Sorghum bicolor: an efficient biosorbent

2018 ◽  
Vol 77 (10) ◽  
pp. 2355-2368 ◽  
Author(s):  
Khalida Naseem ◽  
Zahoor H. Farooqi ◽  
Muhammad Z. Ur Rehman ◽  
Muhammad A. Ur Rehman ◽  
Robina Begum ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Aqueous Media ◽  
Review Article ◽  
Isotherm Models ◽  
Adsorption Efficiency ◽  
Adsorption Isotherm Models ◽  
Removal Of Heavy Metals

Abstract This review is based on the adsorption characteristics of sorghum (Sorghum bicolor) for removal of heavy metals from aqueous media. Different parameters like pH, temperature of the medium, sorghum concentration, sorghum particle size, contact time, stirring speed and heavy metal concentration control the adsorption efficiency of sorghum biomass for heavy metal ions. Sorghum biomass showed maximum efficiency for removal of heavy metal ions in the pH range of 5 to 6. It is an agricultural waste and is regarded as the cheapest biosorbent, having high adsorption capacity for heavy metals as compared to other reported adsorbents, for the treatment of heavy metal polluted wastewater. Adsorption of heavy metal ions onto sorghum biomass follows pseudo second order kinetics. Best fitted adsorption isotherm models for removal of heavy metal ions on sorghum biomass are Langmuir and Freundlich adsorption isotherm models. Thermodynamic aspects of heavy metal ions adsorption onto sorghum biomass have also been elaborated in this review article. How adsorption efficiency of sorghum biomass can be improved by different physical and chemical treatments in future has also been elaborated. This review article will be highly useful for researchers working in the field of water treatment via biosorption processing. The quantitative demonstrated efficiency of sorghum biomass for various heavy metal ions has also been highlighted in different sections of this review article.

scholarly journals Nanomaterials for the Removal of Heavy Metals from Wastewater

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 424 ◽  
Author(s):  
Jinyue Yang ◽  
Baohong Hou ◽  
Jingkang Wang ◽  
Beiqian Tian ◽  
Jingtao Bi ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal Ions ◽  
Polluted Water ◽  
Severe Problem ◽  
Metal Metal ◽  
The World ◽  
Removal Of Heavy Metals ◽  
Carbon Based Nanomaterials ◽  
Promising Perspective ◽  
Future Work

Removal of contaminants in wastewater, such as heavy metals, has become a severe problem in the world. Numerous technologies have been developed to deal with this problem. As an emerging technology, nanotechnology has been gaining increasing interest and many nanomaterials have been developed to remove heavy metals from polluted water, due to their excellent features resulting from the nanometer effect. In this work, novel nanomaterials, including carbon-based nanomaterials, zero-valent metal, metal-oxide based nanomaterials, and nanocomposites, and their applications for the removal of heavy metal ions from wastewater were systematically reviewed. Their efficiency, limitations, and advantages were compared and discussed. Furthermore, the promising perspective of nanomaterials in environmental applications was also discussed and potential directions for future work were suggested.

scholarly journals Changes in phytoplankton productivity with the introduction of heavy metals into the ecosystem and its subsequent purifi cation with a humic sorbent

2019 ◽  
Vol 46 (2) ◽  
pp. 207-213
Author(s):  
T. S. Skripkina ◽  
A. L. Bychkov ◽  
B. S. Smolyakov ◽  
O. I. Lomovsky
Keyword(s):  
Water Pollution ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Humic Acids ◽  
Mesoscale Modeling ◽  
Native Structure ◽  
Phytoplankton Productivity ◽  
Structure Of Molecules ◽  
Removal Of Heavy Metals ◽  
Heavy Metal Cd

Mesoscale modeling experiments simulating water pollution of a freshwater plain reservoir by infusion of a mixture of heavy-metal (Cd, Zn, Cu) salts were conducted. Central to the research was determining the phytoplankton response (in terms of primary production) to the presence of heavy metals in water and to the introduction of a sorbent based on mechanochemically oxidized humic acids. The removal of heavy metals by phytoplankton on the 16th day of the experiment resulted in a decrease in the content of Cd(II) to 62%, Zn(II) to 58%, and Cu(II) to 46% of the initial levels. The use of sorbent under the same conditions led to a decrease in the content of Cd(II) to 21%, Zn(II) to 27%, and Cu(II) to 10% of the initial levels. The sorbent under study does not cause blooming of the reservoir, distinguishing it from sorbents containing humic acids with the native structure of molecules.

4-(2-Pyridylazo)-resorcinol-functionalized polyacrylonitrile fiber through a microwave irradiation method for the simultaneous optical detection and removal of heavy metals from water

2018 ◽  
Vol 4 (4) ◽  
pp. 487-492 ◽  
Author(s):  
Sheng Deng ◽  
GuangShan Zhang ◽  
Peng Wang
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Microwave Irradiation ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Colorimetric Detection ◽  
Optical Detection ◽  
Polyacrylonitrile Fiber ◽  
Microwave Irradiation Method ◽  
Removal Of Heavy Metals

A PAR-functionalized fiber by microwave irradiation has both colorimetric detection and adsorption abilities for heavy metal ions.

scholarly journals Rapid Preparation of Biosorbents with High Ion Exchange Capacity from Rice Straw and Bagasse for Removal of Heavy Metals

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Supitcha Rungrodnimitchai
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Ion Exchange ◽  
Rice Straw ◽  
Heavy Metal Ions ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
Removal Of Heavy Metals

This work describes the preparation of the cellulose phosphate with high ion exchange capacity from rice straw and bagasse for removal of heavy metals. In this study, rice straw and bagasse were modified by the reaction with phosphoric acid in the presence of urea. The introduced phosphoric group is an ion exchangeable site for heavy metal ions. The reaction by microwave heating yielded modified rice straw and modified bagasse with greater ion exchange capacities (∼3.62 meq/g) and shorter reaction time (1.5–5.0 min) than the phosphorylation by oil bath heating. Adsorption experiments towards Pb2+, Cd2+, and Cr3+ions of the modified rice straw and the modified bagasse were performed at room temperature (heavy metal concentration 40 ppm, adsorbent 2.0 g/L). The kinetics of adsorption agreed with the pseudo-second-order model. It was shown that the modified rice straw and the modified bagasse could adsorb heavy metal ions faster than the commercial ion exchange resin (Dowax). As a result of Pb2+sorption test, the modified rice straw (RH-NaOH 450W) removed Pb2+much faster in the initial step and reached 92% removal after 20 min, while Dowax (commercial ion exchange resin) took 90 min for the same removal efficiency.

scholarly journals Application of Iron Oxide Nanomaterials for the Removal of Heavy Metals

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Pragnesh N. Dave ◽  
Lakhan V. Chopda
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Iron Oxide ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Aqueous System ◽  
Oxide Nanoparticles ◽  
Inexpensive Method ◽  
Physiochemical Property ◽  
Removal Of Heavy Metals

In the 21st century water polluted by heavy metal is one of the environment problems. Various methods for removal of the heavy metal ions from the water have extensively been studied. Application of iron oxide nanaparticles based nanomaterials for removal of heavy metals is well-known adsorbents for remediation of water. Due to its important physiochemical property, inexpensive method and easy regeneration in the presence of external magnetic field make them more attractive toward water purification. Surface modification strategy of iron oxide nanoparticles is also used for the remediation of water increases the efficiency of iron oxide for the removal of the heavy metal ions from the aqueous system.

scholarly journals Effective removal of Cu(II) from aqueous solution using Acasia Arabica tree bark sustrate

2020 ◽  
pp. 97-104
Author(s):  
Gharde A. D. ◽  
Gharde B. D.
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Ion Concentration ◽  
Tree Bark ◽  
Agricultural Activity ◽  
Aquatic Life ◽  
Geological Processes

This work reports the characterization of intensive industrial and agricultural activity is the basic reason of enormous pollution of the environment. Heavy metals generally occur in water in low concentration as a result of metal industries and partly through geological processes, but these cause direct toxicity both to human and other living beings. Due to their presence obeyed the specified limit. Heavy metals in wastewater has emerged as focus of environment remediation efforts of industrialization, urbanization with new technological advantages. The natural bodies of water are polluted by means of different contaminant like organic refractories, heavy metal ions etc. The significant concentration of some of the heavy metal ions in water are toxic to human being, animals as well as aquatic organisms. Some heavy metal ions even at the trace level has been recognized toxic to the public health. Many metals have been evaluated toxic to aquatic life certain to threshold toxicity level. The effect of tree bark for Cu(II) from copper sulphate on the metal content of industrial wastewater was investigated in the pH of 4-6. It is observed that the method of binding follows the first order adsorption rate expression such as effect of pH, agitation time, doses of bark substrate, initial metal ion concentration, effect of varying temperature were also studied.

Sign in / Sign up

Export Citation Format

Share Document