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 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 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 Screening Variables in Reducing the Brown Color from the Filtrate of Heavy Metal’s Elimination

2017 ◽  
Vol 1 (2) ◽  
pp. 68-76
Author(s):  
Indrajati Kohar ◽  
Soediatmoko Soediman ◽  
Mario Mario ◽  
Deby Vinolia ◽  
Ni Nyoman Tri Puspaningsih ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Rice Straw ◽  
Incubation Time ◽  
Polluted Water ◽  
Optimum Temperature ◽  
Agriculture Waste ◽  
The World ◽  
Rice Plantation ◽  
Washing Water ◽  
Brown Color

Heavy metals contamination is a major concern in the world, and also is in Indonesia. Manyattempts have been done to reduce or even eliminate it from the environment, among other ways theuse of agriculture waste, such as rice straw. Why use rice straw? Because it is available abundantly.Many studies showed that rice straw could adsorb heavy metals from polluted water, and it is cheap.The drawback of rice straw is the color of the filtrate is brown, so that it cannot be used for everydayor household purposes. An attempt using enzyme has been tried to reduce the brown color and it didreduce the brown color. Enzyme L-α-arabino-furanosidase is used in this study. However, as there aremany variables used in the experiments, before optimization can be conducted, a screening needs to becarried out first. Type of enzyme (optimum temperature of 50oC and 70oC), incubation time and amountof enzyme, number time of washing, water for washing, place of the rice plantation (high land and lowland), and size of straw, are the variables that need to be screened. The variables that gives the highestresponse in this study were enzyme-50, amount of enzyme : straw = 2 : 1 (10 ml of enzyme for each 5g of straw), 1 hour incubation time, amount of washing : 5 x 5 ml, place of plant: low land, and size ofstraw: ground. As for the type of washing liquid, both either demineralised water or Pb solution were thesame. However, the variables are still need to be reduced, and the experiment/study will be continuedto optimize the reduced variables.

scholarly journals A Review on Removal of Heavy Metal Ions from Waste Water using Natural/ Modified Bentonite

2018 ◽  
Vol 144 ◽  
pp. 02021 ◽  
Author(s):  
Prathiksha P. Prabhu ◽  
Balakrishna Prabhu
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Heavy Metal Ions ◽  
Well Being ◽  
Potential Effect ◽  
Inorganic Contaminants ◽  
Inorganic Pollutants ◽  
Environment Friendly ◽  
Modified Bentonite ◽  
Removal Of Heavy Metals

The pollution of water due to various toxic components especially heavy metals are causing an adverse effect on the flora and fauna and also have a potential effect on the human well-being. Due to this there is an immediate requirement to find various techniques for the removal of lethal toxins in wastewater. Amongst all of the existing methods, adsorption is one of the most effective and efficient technique for the elimination of contaminants such as heavy metals from wastewater. The increasing number of research publications on adsorption of heavy metals using modified bentonite leads to the fact that there has been a surging importance in the production of a variety of economical adsorbents for water treatment. Outcome from the latest advances in using bentonites and modified bentonite shows the adaptable nature of the clay and its environment friendly nature. The present review shows the removal of heavy metals using modified bentonite. The main purpose of this review is to describe the flexible way of natural bentonite and modified bentonite and its ability to absorb array of inorganic pollutants, which are present in the waste water. It is apparent from the review that modified bentonite have displayed high removal potential for certain kind of inorganic contaminants from wastewater.

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.

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 Various Absorbents and Parameters Affecting Removal of Water Hardness from Wastewater: Review

2020 ◽  
Vol 6 (3) ◽  
Author(s):  
Tamiru M ◽  
Bekele G
Keyword(s):  
Heavy Metals ◽  
Nanostructured Materials ◽  
Adsorption Process ◽  
Review Paper ◽  
Low Cost ◽  
Water Hardness ◽  
The World ◽  
Removal Of Heavy Metals ◽  
Different Sources

Discharges of heavy metals from different sources to the water lead to water hardness which is the major problem of the world due to their toxic and carcinogenic nature. Among several methods to eliminate heavy metals, absorption is the leading technique for the removal of heavy metals from wastewater because it is efficient, available, low-cost, and eco-friend. This review paper gives detail information about adsorbents on both conventional and nanostructured materials, either occur naturally or available commercially. The review also contains properties and parameters which affect the adsorption process with essential clarifications that are given by researchers.

scholarly journals Heavy metals and their general toxicity for plants

2018 ◽  
Vol 5 (1) ◽  
pp. 14-18 ◽  
Author(s):  
Darinka Gjorgieva Ackova
Keyword(s):  
Heavy Metals ◽  
Metal Toxicity ◽  
Environmental Pollutants ◽  
Chemical Form ◽  
Toxic Heavy Metals ◽  
Biochemical Processes ◽  
Metal Metal ◽  
The World ◽  
Research Programmes ◽  
Physiological And Biochemical

Heavy metals are important environmental pollutants, and their toxicity is a serious problem of great concern for environmental, ecological, nutritional and toxicological reasons. Metals can affected long list of physiological and biochemical processes in plants and their toxicity varies with plant species, particular metal, metal concentration and it chemical form. Throughout the world, researches have been conducted extensive investigations to determine the effects of toxic heavy metals on plants. The process is still going on and the need of intensification of the research programmes for better understanding of heavy metal toxicity is evident.

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.

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