Diatomite Modification and its Adsorption of Heavy Metal Ions

2013 ◽  
Vol 864-867 ◽  
pp. 664-667 ◽  
Author(s):  
Guo Ri Dong ◽  
Yan Zhang
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Heavy Metal Ion

Diatomite plays a very important role in sewage adsorption and especially has vast prospect in adsorbing heavy metal ions. The paper, on the basis of domestic and overseas literatures concerning diatomite, summarizes the modification methods of diatomite and adsorption research of heavy metal ions. Besides, it also forecasts the prospect of using diatomite to specifically adsorb heavy metal ion.

Heavy metal ion discrimination based on distinct interaction between single-stranded DNA and methylene blue

2019 ◽  
Vol 11 (1) ◽  
pp. 17-20 ◽  
Author(s):  
Li Li ◽  
Bing Liu ◽  
Zhengbo Chen
Keyword(s):  
Heavy Metal ◽  
Methylene Blue ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Sensor Array ◽  
Colorimetric Sensor ◽  
Heavy Metal Ion ◽  
Single Stranded Dna ◽  
Colorimetric Sensor Array

In this work, we developed a facile and extensible colorimetric sensor array based on different interactions between methylene blue (MB) and single-stranded DNA (ssDNA) for the discrimination of heavy metal ions.

Effect of Different Chemical and Physical Characteristic Having Lignocellulosic Fibers on Heavy Metal Ion Removal from Auqueous Solution

2008 ◽  
Vol 569 ◽  
pp. 285-288 ◽  
Author(s):  
Hyun Jong Lee ◽  
Beom Goo Lee ◽  
Dae Yong Shin ◽  
Heon Park
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Heavy Metal Ion ◽  
Metal Ion Removal ◽  
Ion Removal ◽  
Lignocellulosic Fibers ◽  
Heavy Metal Ion Removal ◽  
Kenaf Bast

In this study lignocellulosic fibers, such as kenaf bast, kenaf core, sugar cane bagasse, cotton, coconut coir, and spruce, which are environment friendly natural materials, were tested for their ability to remove copper, nickel and zinc ions from aqueous solutions. The fibers were analyzed for Klason lignin content, water sorption capacity and dry volume. The fiber with the highest level of heavy metal removal in the separate and mixed solution was kenaf bast.. In the mixed solution kenaf bast, sugar cane bagasse and cotton removed more copper and nickel ion than in the separate solution, and the amounts of removed heavy metal ions were changed in some lignocellulosic fibers, compared to those of the separate solution. In the mixed solution heavy metal ions may compete with one another for sorption sites on the surface of lignocellusic fiber. In kenaf bast to remove heavy metal ions most, Klason lignin content was the second lowest, and water sorption and dry volume were the lowest in all tested lignocellulosic fibers. It showed that removal of heavy metal ions does not correlate with any chemical and physical factors, but may be affected by the cell wall structure of lignocellulosic fibers and how many free phenolic groups in lignin, which are considered as the heavy metal ion binding site, are exposed on the surface of fibers. Cotton, with about 1% Klason lignin, was very low in heavy metal ion removal, while all other fibers containing greater than about 10% lignin did remove heavy metal ions. It showed that even the lignin content of lignocellulosic fibers does not correlate with heavy metal ion removal but lignin does play a role in heavy metal ion removal.

scholarly journals Arabidopsis CNGC Family Members Contribute to Heavy Metal Ion Uptake in Plants

2019 ◽  
Vol 20 (2) ◽  
pp. 413 ◽  
Author(s):  
Ju Moon ◽  
Célestine Belloeil ◽  
Madeline Ianna ◽  
Ryoung Shin
Keyword(s):  
Heavy Metal ◽  
Ion Transport ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Primary Root ◽  
Heavy Metal Ion ◽  
Cellular Processes ◽  
Metal Ion Transport ◽  
Primary Focus

Heavy metal ions, including toxic concentrations of essential ions, negatively affect diverse metabolic and cellular processes. Heavy metal ions are known to enter cells in a non-selective manner; however, few studies have examined the regulation of heavy metal ion transport. Plant cyclic nucleotide-gated channels (CNGCs), a type of Ca2+-permeable-channel, have been suggested to be involved in the uptake of both essential and toxic cations. To determine the candidates responsible for heavy metal ion transport, a series of Arabidopsis CNGC mutants were examined for their response to Pb2+ and Cd2+ ions. The primary focus was on root growth and the analysis of the concentration of heavy metals in plants. Results, based on the analysis of primary root length, indicated that AtCNGC1, AtCNGC10, AtCNGC13 and AtCNGC19 play roles in Pb2+ toxicity, while AtCNGC11, AtCNGC13, AtCNGC16 and AtCNGC20 function in Cd2+ toxicity in Arabidopsis. Ion content analysis verified that the mutations of AtCNGC1 and AtCNGC13 resulted in reduced Pb2+ accumulation, while the mutations of AtCNGC11, AtCNGC15 and AtCNGC19 resulted in less Pb2+ and Cd2+ accumulation in plants. These findings provide functional evidence which support the roles of these AtCNGCs in the uptake and transport of Pb2+ or Cd2+ ion in plants.

Synthesis, characterization, and highly acid-resistant properties of crosslinking β-chitosan with polyamines for heavy metal ion adsorption

RSC Advances ◽  
2016 ◽  
Vol 6 (106) ◽  
pp. 104754-104762 ◽  
Author(s):  
Ming-Tsung Wu ◽  
Yen-Ling Tsai ◽  
Chih-Wei Chiu ◽  
Chih-Chia Cheng
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Heavy Metal Ion ◽  
Ion Adsorption ◽  
Adsorption Characteristics ◽  
Metal Ion Adsorption ◽  
Acidic Environments

A novel crosslinking modification of β-chitosan and successfully analyzed its fast adsorption characteristics for different heavy metal ions in highly acidic environments.

scholarly journals The effect of mercury, copper, and zinc on paraoxonase (PON) enzyme activity in Bonito (Sarda sarda) fish

2021 ◽  
Vol 38 (4) ◽  
pp. 479-486
Author(s):  
Büşra Şahin ◽  
Sena Çenesiz
Keyword(s):  
Heavy Metal ◽  
Enzyme Activity ◽  
Metal Ions ◽  
Environmental Pollution ◽  
Enzyme Activities ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Heavy Metal Ion ◽  
Significant Difference ◽  
Sarda Sarda

Since heavy metal dirtiness, which we frequently encounter in environmental pollution causes harmful effects on the organism through biochemical enzyme reactions, in this study, the effects of mercury (Hg+2), copper (Cu+2), and zinc (Zn+2) heavy metal ions, which are common in environmental pollution, on PON (paraoxonase) enzyme activity in muscle tissue of bonito (Sarda sarda) were investigated. In the study, 25 bonito (S. sarda) fish muscle tissues freshly obtained from the Samsun region sea were used. The changes in PON enzyme activity were determined by adding different volumes of heavy metal solutions. PON enzyme activities of Hg+2 heavy metal ion used in different volumes were calculated as 30.9383 U/mLdak, 29.0598 U/mLdak, 26.3799 U/mLdak, 23.9443 U/mLdak, 20.6725 U/mLdak, PON enzyme activities of Cu+2 heavy metal ion used in different volumes were calculated as 19.7949 U/mLdak, 19.4807 U/mLdak 19.1864 U/mLdak, 19.1200 U/mLdak, 18.9037 U/mLdak and PON enzyme activities of Zn+2 heavy metal ion used in different volumes were calculated as 23.8305 U/mLdak, 23.0781 U/mLdak, 22.9073 U/mLdak, 22.4324 U/mLdak, 21.8159 U/mLdak. As a result of these obtained data, activity (%) values were calculated and activity (%) graphs were drawn. As a result of the study, it was determined that increasing concentrations of Cu+2 and Zn+2 heavy metal ions caused a decrease in PON enzyme activity, but there was no statistically significant difference between the different concentrations used. It was determined that increasing concentrations of Hg+2 heavy metal ion inhibited the PON enzyme activity, caused a statistically significant decrease between the activities depending on the different concentrations used (p < 0.05).

scholarly journals Development of Biopolymer and Conducting Polymer-Based Optical Sensors for Heavy Metal Ion Detection

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2548 ◽  
Author(s):  
Nur Syahira Md Ramdzan ◽  
Yap Wing Fen ◽  
Nur Ain Asyiqin Anas ◽  
Nur Alia Sheh Omar ◽  
Silvan Saleviter
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Conducting Polymer ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Polymer Materials ◽  
Heavy Metal Ion ◽  
Sufficient Evidence ◽  
Ion Detection ◽  
Metal Ion Detection

Great efforts have been devoted to the invention of environmental sensors as the amount of water pollution has increased in recent decades. Chitosan, cellulose and nanocrystalline cellulose are examples of biopolymers that have been intensively studied due to their potential applications, particularly as sensors. Furthermore, the rapid use of conducting polymer materials as a sensing layer in environmental monitoring has also been developed. Thus, the incorporation of biopolymer and conducting polymer materials with various methods has shown promising potential with sensitively and selectively toward heavy metal ions. In this feature paper, selected recent and updated investigations are reviewed on biopolymer and conducting polymer-based materials in sensors aimed at the detection of heavy metal ions by optical methods. This review intends to provide sufficient evidence of the potential of polymer-based materials as sensing layers, and future outlooks are considered in developing surface plasmon resonance as an excellent and valid sensor for heavy metal ion detection.

scholarly journals Heavy Metal Ion Adsorption Properties of Methacrylamidocysteine-Containing Porous Poly(Hydroxyethyl Methacrylate) Chelating Beads

2002 ◽  
Vol 20 (7) ◽  
pp. 607-617 ◽  
Author(s):  
Adil Denizli ◽  
Bora Garipcan ◽  
Sibel Emir ◽  
Süleyman Patir ◽  
Ridvan Say
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Metal Removal ◽  
Ph Value ◽  
Heavy Metal Removal ◽  
Ion Concentration ◽  
Heavy Metal Ion ◽  
Adsorption Capacities

Details of the adsorption performance of poly(2-hydroxyethylmethacrylate–methacrylamidocysteine) [p(HEMA–MAC)] beads towards the removal of heavy metal ions from aqueous solution were studied. The metal-complexing ligand and/or co-monomer MAC was newly synthesized from methylacrylochloride and cysteine. Spherical beads of average size 150–200 mm were obtained by the radical suspension polymerization of MAC and HEMA conducted in an aqueous dispersion. The p(HEMA–MAC) beads obtained had a specific surface area of 18.9 m2/g. p(HEMA–MAC) beads were characterized by swelling studies, FT-IR spectroscopy and elemental analysis. Such beads with a swelling ratio of 72%, and containing 3.9 mmol MAC/g, were used for heavy metal removal studies. The adsorption capacities of the beads for selected metal ions, i.e. CdII, AsIII, CrIII, HgII and PbII, were investigated in aqueous media containing different amounts of these ions (10–750 mg/l) and at different pH values (3.0–7.0). The adsorption rate was fast in all cases. The maximum adsorption capacities of the p(HEMA–MAC) beads were 1058.2 mg/g for CdII, 123.4 mg/g for AsIII, 199.6 mg/g for CrIII, 639.1 mg/g for PbII and 1018.6 mg/g for HgII. On a molar basis, the following affinity order was observed: CdII > HgII > CrIII > PbII >AsIII. The adsorption capacity of the MAC-incorporated beads was affected significantly by the pH value of the aqueous medium. The adsorption of heavy metal ions from artificial wastewater was also studied. In this case, the adsorption capacities were 52.2 mg/g for CdII, 23.1 mg/g for CrIII, 83.4 mg/g for HgII, 62.6 mg/g for PbII and 11.1 mg/g for AsIII at an initial metal ion concentration of 0.5 mmol/l. The chelating beads could be regenerated easily with a higher effectiveness by 0.1 M HNO3. These features make p(HEMA–MAC) beads potential candidates for heavy metal ion removal at high capacity.

scholarly journals Pattern of antibiotic and heavy-metal ion resistance in recent hospital isolates ofStaphylococcus aureus

1987 ◽  
Vol 99 (2) ◽  
pp. 343-347 ◽  
Author(s):  
M. R. Millar ◽  
N. Griffin ◽  
N. Keyworth
Keyword(s):  
Heavy Metal ◽  
Staphylococcus Aureus ◽  
Metal Ions ◽  
Ethidium Bromide ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Heavy Metal Ion ◽  
Mercury Resistance ◽  
Ofstaphylococcus Aureus ◽  
Resistant Strains

SUMMARYTwo hundred and one strains ofStaphylococcus aureusisolated from in-patients and out-patients were examined for sensitivity to antibiotics, heavy-metal ions and ethidium bromide and for phage-typing pattern.Heavy-metal ion resistance was less frequent than reported in previous studies and was as frequent in penicillinase non-producing as producing strains. ‘Methicillin-resistant’ strains were resistance to ethidium bromide and mercury. Resistance to heavy-metal ions, including cadmium, may bo becoming less common amongst clinical isolates ofS. aureus.

Highly selective and efficient chelating fiber functionalized by bis(2-pyridylmethyl)amino group for heavy metal ions

2016 ◽  
Vol 7 (23) ◽  
pp. 3874-3883 ◽  
Author(s):  
Gang Xu ◽  
Yujia Xie ◽  
Jian Cao ◽  
Minli Tao ◽  
Wen-Qin Zhang
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
High Selectivity ◽  
Heavy Metal Ion ◽  
Polyacrylonitrile Fiber ◽  
Amino Group ◽  
Ion Absorption ◽  
Metal Ion Absorption

A classical bis(2-pyridylmethyl)amino group-modified polyacrylonitrile fiber possesses high selectivity and excellent recyclability for heavy metal ion absorption.

Sign in / Sign up

Export Citation Format

Share Document