scholarly journals Cation Exchange of Natural Zeolites: Worldwide Research

2021 ◽  
Vol 13 (14) ◽  
pp. 7751
Author(s):  
Fernando Morante-Carballo ◽  
Néstor Montalván-Burbano ◽  
Paúl Carrión-Mero ◽  
Nathaly Espinoza-Santos
Keyword(s):  
Cation Exchange ◽  
Environmental Remediation ◽  
Metal Removal ◽  
Academic Discipline ◽  
Heavy Metal Removal ◽  
Cognitive Structure ◽  
The United States ◽  
Intellectual Structure ◽  
Natural Zeolites ◽  
Growth Trend

Research on natural zeolites (NZ) has increased over the years, showing potential in different areas, and many of them involve cation exchange (CE), considered one of the essential properties of NZ. This work aims to identify studies’ cognitive structure based on the cation exchange capacity (CEC) of NZ through bibliometric analysis to evaluate scientific production, growth trend, and visualization through bibliometric maps using the VOSviewer software. All types of documents and all languages indexed in Scopus from 1970 to 2020 were considered for the database, obtaining 703 documents. The results indicate an increasing trend in CE annual publications in NZ. This analysis shows the most influential authors such as Daković, Wang and Colella, while the countries that stand out are China, Turkey and the United States. Besides, the bibliometric maps made it possible to understand the intellectual structure of this academic discipline, identifying areas of current and potential interest in this field of studies such as its application in medicine, agriculture, catalysts, heavy metal removal, wastewater treatment (WWT), bioremediation and construction. Finally, these studies showed trends in science and technology studies favoring environmental remediation and human health.

Heavy metal removal by biomass-derived carbon nanotubes as a greener environmental remediation: A comprehensive review

Chemosphere ◽  
2021 ◽  
pp. 131959
Author(s):  
Anh Tuan Hoang ◽  
Sandro Nižetić ◽  
Chin Kui Cheng ◽  
Rafael Luque ◽  
Sabu Thomas ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Environmental Remediation ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Comprehensive Review

scholarly journals A Way to Membrane-Based Environmental Remediation for Heavy Metal Removal

Environments ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 52
Author(s):  
Catia Algieri ◽  
Sudip Chakraborty ◽  
Sebastiano Candamano
Keyword(s):  
Heavy Metal ◽  
Environmental Remediation ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Scale Up ◽  
Operating Conditions ◽  
Advantages And Disadvantages ◽  
Research Activities ◽  
Key Steps

During the last century, industrialization has grown very fast and as a result heavy metals have contaminated many water sources. Due to their high toxicity, these pollutants are hazardous for humans, fish, and aquatic flora. Traditional techniques for their removal are adsorption, electro-dialysis, precipitation, and ion exchange, but they all present various drawbacks. Membrane technology represents an exciting alternative to the traditional ones characterized by high efficiency, low energy consumption and waste production, mild operating conditions, and easy scale-up. In this review, the attention has been focused on applying driven-pressure membrane processes for heavy metal removal, highlighting each of the positive and negative aspects. Advantages and disadvantages, and recent progress on the production of nanocomposite membranes and electrospun nanofiber membranes for the adsorption of heavy metal ions have also been reported and critically discussed. Finally, future prospective research activities and the key steps required to make their use effective on an industrial scale have been presented

scholarly journals Essential Oil Analysis of Coriander Plant of Konya Region

2021 ◽  
Vol 2 (5) ◽  
pp. 01-03
Author(s):  
Hayriye Alp
Keyword(s):  
Essential Oil ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
The United States ◽  
Herbaceous Plant ◽  
Oil Analysis ◽  
Perennial Herbaceous Plant ◽  
Western Asia ◽  
The Mediterranean Basin ◽  
Specialist Pharmacist

Coriander is a small aromatic perennial herbaceous plant that grows widely in western Asia, India, Pakistan, the Mediterranean basin, and the United States. Although all parts of the plant can be eaten, its fresh leaves and dry seeds are used more. fructose, sucrose), alkaloids, flavones, resins, tannins, anthroquinones, sterols (β-stesterol and β-cytosterelin), and fixed oils. Has a small amount of carminative agent. Coriander plant samples were collected by a specialist pharmacist and phytotherapist (Muammaer Şen). Cultured medicinal marshmallow herb flower was harvested and dried. The dried plant was sorted and packed in packages of 50 grams using precision scales. 100gr of randomly selected samples. It was sent to BATAM laboratory for analysis. The essential oil analysis of the coriander plant of the Konya region has been found in accordance with the pharmacopoeia standards. Coriander plant is used to take advantage of its heavy metal removal feature. Many factors can affect the essential oil ratio of the plant. It is possible to make maximum use of the essential oils of the coriander plant by making the environmental factors suitable.

Environmental remediation of heavy metal ions from aqueous solution through hydrogel adsorption: a critical review

2015 ◽  
Vol 73 (5) ◽  
pp. 983-992 ◽  
Author(s):  
Francis Ntumba Muya ◽  
Christopher Edoze Sunday ◽  
Priscilla Baker ◽  
Emmanuel Iwuoha
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Environmental Remediation ◽  
Heavy Metal Ions ◽  
Metal Removal ◽  
Aqueous Media ◽  
Heavy Metal Removal ◽  
Aquatic Life ◽  
Potential Toxic Elements ◽  
Treatment Technologies

Heavy metal ions such as Cd2+, Pb2+, Cu2+, Mg2+, and Hg2+ from industrial waste water constitute a major cause of pollution for ground water sources. These ions are toxic to man and aquatic life as well, and should be removed from wastewater before disposal. Various treatment technologies have been reported to remediate the potential toxic elements from aqueous media, such as adsorption, precipitation and coagulation. Most of these technologies are associated with some shortcomings, and challenges in terms of applicability, effectiveness and cost. However, adsorption techniques have the capability of effectively removing heavy metals at very low concentration (1–100 mg/L). Various adsorbents have been reported in the literature for this purpose, including, to a lesser extent, the use of hydrogel adsorbents for heavy metal removal in aqueous phase. Here, we provide an in-depth perspective on the design, application and efficiency of hydrogel systems as adsorbents.

Capacitive deionization and electrosorption for heavy metal removal

2020 ◽  
Vol 6 (2) ◽  
pp. 258-282 ◽  
Author(s):  
Raylin Chen ◽  
Thomas Sheehan ◽  
Jing Lian Ng ◽  
Matthew Brucks ◽  
Xiao Su
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Water Purification ◽  
Environmental Remediation ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Resource Recovery ◽  
Capacitive Deionization

Electrosorption and capacitive deionization technologies can be effective processes in removing heavy metal for water purification, wastewater treatment, resource recovery, and environmental remediation.

scholarly journals Applications of Nanomaterials for Heavy Metal Removal from Water and Soil: A Review

2021 ◽  
Vol 13 (2) ◽  
pp. 713
Author(s):  
Guo Yu ◽  
Xinshuai Wang ◽  
Jie Liu ◽  
Pingping Jiang ◽  
Shaohong You ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Environmental Remediation ◽  
Metal Removal ◽  
Chemical Reactivity ◽  
Heavy Metal Removal ◽  
Factors Affecting ◽  
Adsorption Capacities ◽  
Challenges And Opportunities ◽  
Points Of View ◽  
Widespread Interest

Heavy metals are toxic and non-biodegradable environmental contaminants that seriously threaten human health. The remediation of heavy metal-contaminated water and soil is an urgent issue from both environmental and biological points of view. Recently, nanomaterials with excellent adsorption capacities, great chemical reactivity, active atomicity, and environmentally friendly performance have attracted widespread interest as potential adsorbents for heavy metal removal. This review first introduces the application of nanomaterials for removing heavy metal ions from the environment. Then, the environmental factors affecting the adsorption of nanomaterials, their toxicity, and environmental risks are discussed. Finally, the challenges and opportunities of applying nanomaterials in environmental remediation are discussed, which can provide perspectives for future in-depth studies and applications.

scholarly journals Synthesis, Optical Characterization, and Adsorption of Novel Hexavalent Chromium and Total Chromium Sorbent: A Fabrication of Mulberry Stem Biochar/Mn-Fe Binary Oxide Composite via Response Surface Methodology

2021 ◽  
Vol 2 ◽  
Author(s):  
Shuiping Xu ◽  
Meina Liang ◽  
Yanmei Ding ◽  
Dunqiu Wang ◽  
Yinian Zhu ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Environmental Remediation ◽  
Metal Removal ◽  
Synergistic Effects ◽  
Heavy Metal Removal ◽  
Binary Oxide ◽  
Point Of Zero Charge ◽  
Total Chromium ◽  
Oxide Composite

In this study, a new generation chromium sorbent, mulberry stem biochar/Mn-Fe binary oxide composite (MBC-MFC), was fabricated by chemical precipitation on carbonized mulberry stem according to response surface methodology (RSM) results. RSM was more convenient to figure out the optimized preparation condition of MBC-MFC theoretically for achieving a maximum removal efficiency of Cr(VI) and total chromium (TCr), compared to labor-intensive orthogonal experiments. The RSM results showed that Fe/Mn concentration (CFe; CMn), MBC activation temperature after soaking in KOH solution (T), and pH during precipitation of Fe-Mn oxide were three main factors to significantly affect the efficiency of MBC-MFC (p < 0.05) in Cr(VI) and TCr removal. With the selected condition (CFe = 0.28 mol/L; CMn = 0.14 mol/L; T = 790°C; pH = 9.0), MBC-MFC was synthesized with a large surface area (318.53 m2/g), and the point of zero charge values of MBC-MFC was 5.64. The fabricated MBC-MFC showed excellent adsorption performance of Cr(VI) and TCr in an aqueous solution. The maximum Cr(VI) and TCr removal capacity of MBC-MFC was 56.18 and 54.97 mg/g (T = 25°C, pH = 3.0, t = 48 h, and dosage = 0.10 g/50 ml), respectively, and the maximum Cr(VI) adsorption of MBC-MFC was 4.16 times that of bare MBC, suggesting the synergistic effects of Fe/Mn oxides and MB on the performance of MBC-MFC in Cr(VI) and TCr removal. The adsorption mechanism of MBC-MFC on chromium was mainly contributed by surface complexation and electrostatic attraction. Our study offers valuable outlooks to develop high-performance biochar-based sorbents for heavy metal removal and sustainable environmental remediation.

scholarly journals Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1779
Author(s):  
Saumya Agrawal ◽  
Rashmi Ranjan ◽  
Bajrang Lal ◽  
Ashiqur Rahman ◽  
Swatantra P. Singh ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Water Treatment ◽  
Environmental Remediation ◽  
Electrode Materials ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Membrane Distillation ◽  
Electrospinning Process

In the past few decades, the role of nanotechnology has expanded into environmental remediation applications. In this regard, nanofibers have been reported for various applications in water treatment and air filtration. Nanofibers are fibers of polymeric origin with diameters in the nanometer to submicron range. Electrospinning has been the most widely used method to synthesize nanofibers with tunable properties such as high specific surface area, uniform pore size, and controlled hydrophobicity. These properties of nanofibers make them highly sought after as adsorbents, photocatalysts, electrode materials, and membranes. In this review article, a basic description of the electrospinning process is presented. Subsequently, the role of different operating parameters in the electrospinning process and precursor polymeric solution is reviewed with respect to their influence on nanofiber properties. Three key areas of nanofiber application for water treatment (desalination, heavy-metal removal, and contaminant of emerging concern (CEC) remediation) are explored. The latest research in these areas is critically reviewed. Nanofibers have shown promising results in the case of membrane distillation, reverse osmosis, and forward osmosis applications. For heavy-metal removal, nanofibers have been able to remove trace heavy metals due to the convenient incorporation of specific functional groups that show a high affinity for the target heavy metals. In the case of CECs, nanofibers have been utilized not only as adsorbents but also as materials to localize and immobilize the trace contaminants, making further degradation by photocatalytic and electrochemical processes more efficient. The key issues with nanofiber application in water treatment include the lack of studies that explore the role of the background water matrix in impacting the contaminant removal performance, regeneration, and recyclability of nanofibers. Furthermore, the end-of-life disposal of nanofibers needs to be explored. The availability of more such studies will facilitate the adoption of nanofibers for water treatment applications.

scholarly journals Use of Natural Zeolites as a Detoxifier of Heavy Metals in Water and the Flesh of Reared European Seabass Dicentrarchus labrax

2020 ◽  
Vol 78 (3) ◽  
pp. 121-132
Author(s):  
Hadir A. Aly ◽  
Mohamed M. Abdel-Rahim ◽  
Ghada R. Sallam ◽  
Ayman M. Lotfy ◽  
Basem S. Abdelaty
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Body Weight ◽  
Removal Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Dicentrarchus Labrax ◽  
Feed Utilization ◽  
Natural Zeolites ◽  
Fish Flesh

AbstractA study was conducted to investigate the effects of natural zeolites as a water clarifier on the heavy metal removal efficiency from the underground saltwater used for rearing Dicentrarchus labrax fry. Five concentrations of zeolites were tested: 0 (Z0), 2.5‰ (Z2.5), 5‰ (Z5), 7.5‰ (Z7.5) and 10‰ (Z10). Fry with an initial body weight of 1.53±0.018 g/fish were stocked in 15 aquaria at a density of 10 fry/aquarium. The fish were fed a commercial diet (42% protein and 12.34% lipid) twice daily (09:30 and 14:00) at 5% of their body weight per day for 42 days. Growth, feed utilization, survival and heavy metal removal efficiency were evaluated. The growth performance and feed utilization indices gradually improved with increasing zeolite concentration, with the most significant (P≤0.05) values detected at Z10. The survival rate decreased significantly at Z10 compared with the control (Z0). Increasing the zeolite concentration significantly (P≤0.05) improved the removal efficiency of heavy metals in the rearing water with adsorption selectivity of Pb˃Cd˃Fe˃Cu˃Zn. Furthermore, an increase in the detoxification rate of heavy metals in fish flesh with increasing zeolite level was detected with the removal selectivity of Fe˃Cu˃Zn˃Pb˃Cd. In conclusion, it can be stated that natural zeolites can be used effectively to reduce heavy metals in polluted waters and subsequently in fish flesh in addition to improving fish performance.

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