scholarly journals Potential Use of Agro/Food Wastes as Biosorbents in the Removal of Heavy Metals

2020 ◽  
Author(s):  
Faizan Ahmad ◽  
Sadaf Zaidi
Keyword(s):  
Heavy Metals ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Membrane Filtration ◽  
Toxic Metal ◽  
Lead Ion ◽  
Food Wastes ◽  
Toxic Metal Ions ◽  
Alternative Technologies ◽  
Removal Of Heavy Metals

The production of large quantities of agro/food wastes from food processing industries and the release of pollutants in the form of heavy metals from various metallurgical industries are the grave problems of the society as well as serious threats to the environment. It is estimated that approximately one–third of all food that is produced goes to waste, meaning thereby that nearly 1.3 billion tonnes of agro/food wastes are generated per year. This readily available and large amount waste can be utilized for the removal of toxic metals obtained from metallurgical industries by converting it into the adsorbents. For example, mango peel showed adsorption capacity of 68.92 mg/g in removing cadmium II ions. Similarly, coconut waste showed a higher adsorption capacity of 285 and 263 mg/g in removing cadmium and lead ion, respectively. Biosorption and bioaccumulation are recommended as novel, efficient, eco-friendly, and less costly alternative technologies over the conventional methods such as ion exchange, chemical precipitation, and membrane filtration, etc. for the removal of toxic metal ions. Because of the presence of metal-binding functional groups, the industrial by-products, agro-wastes and microbial biomass are considered as the potential biosorbents. Thus they can be used for the removal of toxic metal ions. This chapter highlights the available information and methods on utilizing the agro/food waste for the eradication of toxic and heavy metal ions. Furthermore, this chapter also focuses on the sorption mechanisms of different adsorbents as well as their adsorbing capacities.

scholarly journals Efficient Separation of Heavy Metals by Magnetic Nanostructured Beads

Inorganics ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 40 ◽  
Author(s):  
Lisandra de Castro Alves ◽  
Susana Yáñez-Vilar ◽  
Yolanda Piñeiro-Redondo ◽  
José Rivas
Keyword(s):  
Heavy Metals ◽  
Ternary System ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Metal System ◽  
Adsorption Sites ◽  
Removal Of Heavy Metals ◽  
Adsorption Desorption ◽  
Efficient Adsorbent

This study reports the ability of magnetic alginate activated carbon (MAAC) beads to remove Cd(II), Hg(II), and Ni(II) from water in a mono-metal and ternary system. The adsorption capacity of the MAAC beads was highest in the mono-metal system. The removal efficiency of such metal ions falls in the range of 20–80% and it followed the order Cd(II) > Ni(II) > Hg(II). The model that best fitted in the ternary system was the Freundlich isotherm, while in the mono-system it was the Langmuir isotherm. The maximum Cd(II), Hg(II), and Ni(II) adsorption capacities calculated from the Freundlich isotherm in the mono-metal system were 7.09, 5.08, and 4.82 (mg/g) (mg/L)1/n, respectively. Lower adsorption capacity was observed in the ternary system due to the competition of metal ions for available adsorption sites. Desorption and reusability experiments demonstrated the MAAC beads could be used for at least five consecutive adsorption/desorption cycles. These findings suggest the practical use of the MAAC beads as efficient adsorbent for the removal of heavy metals from wastewater.

scholarly journals In Situ Immobilization on the Silica Gel Surface and Adsorption Capacity of Poly[N-(4-carboxyphenyl)methacrylamide] on Toxic Metal Ions

2017 ◽  
Vol 12 (1) ◽  
Author(s):  
Elina Yanovska ◽  
Irina Savchenko ◽  
Dariusz Sternik ◽  
Olga Kychkiruk ◽  
Lidiya Ol’khovik ◽  
...  
Keyword(s):  
Metal Ions ◽  
Adsorption Capacity ◽  
Silica Gel ◽  
Toxic Metal ◽  
In Situ Immobilization ◽  
Toxic Metal Ions

scholarly journals In situ immobilization on the silica gel surface and adsorption capacity of polymer-based azobenzene on toxic metal ions

2018 ◽  
Vol 9 (5) ◽  
pp. 657-664 ◽  
Author(s):  
Irina Savchenko ◽  
Elina Yanovska ◽  
Dariusz Sternik ◽  
Olga Kychkyruk ◽  
Lidiya Ol’khovik ◽  
...  
Keyword(s):  
Metal Ions ◽  
Adsorption Capacity ◽  
Silica Gel ◽  
Toxic Metal ◽  
In Situ Immobilization ◽  
Toxic Metal Ions

scholarly journals Heavy Metals Removal from Electroplating Wastewater by Waste Fiber-Based Poly(amidoxime) Ligand

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1260
Author(s):  
Md. Lutfor Rahman ◽  
Zhi Jian Wong ◽  
Mohd Sani Sarjadi ◽  
Sabrina Soloi ◽  
Sazmal E. Arshad ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Metal Ions ◽  
Sorption Capacity ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Toxic Metal ◽  
High Concentration ◽  
Trace Level ◽  
Electroplating Wastewater ◽  
Toxic Metal Ions

An efficient and economical treatment technology for heavy metal removal from the electroplating wastewaters is needed for the water purification. Therefore, pure cellulosic materials were derived from two waste fiber (pandanus fruit and durian rind) and conversion of the cellulose into the poly(acrylonitrile)-grafted material was accomplished by free radical grafting system. Thereafter, poly(amidoxime) ligand was produced from the grafted materials. Sorption capacity (qe) of several toxic metals ions was found to be high, e.g., copper capacity (qe) was 298.4 mg g−1 at pH 6. In fact, other metal ions, such as cobalt chromium and nickel also demonstrated significant sorption capacity at pH 6. Sorption mechanism played acceptable meet with pseudo second-order rate of kinetic pattern due to the satisfactory correlation with the experimental sorption values. A significant correlation coefficient (R2 > 0.99) with Langmuir model isotherm showed the single or monolayer sorption occurred on the surfaces. The reusability study showed that the polymer ligand can be useful up to six cycles with minimum loss (7%) of efficiency and can be used in the extraction of toxic metal ions present in the wastewaters. Therefore, two types of electroplating wastewater were used in this study, one containing high concentration of copper (23 ppm) and iron (32 ppm) with trace level of others heavy metals (IWS 1) and another containing high concentration of copper (85.7 ppm) only with trace level of others heavy metals (IWS 2). This polymeric ligand showed acceptable removal magnitude, up to 98% of toxic metal ions can be removed from electroplating wastewater.

Colorimetric sensing approaches based on silver nanoparticles aggregation for determination of toxic metal ions in water sample: a review

2021 ◽  
pp. 1-16
Author(s):  
Rajat Singh ◽  
Rahul Mehra ◽  
Ankita Walia ◽  
Simmy Gupta ◽  
Prince Chawla ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Metal Ions ◽  
Water Sample ◽  
Toxic Metal ◽  
Colorimetric Sensing ◽  
Toxic Metal Ions

The facile soft-template-morphology-controlled (STMC) synthesis of ZnIn2S4 nanostructures and their excellent morphology-dependent adsorption properties

2020 ◽  
Vol 8 (4) ◽  
pp. 1986-2000 ◽  
Author(s):  
Afaq Ahmad Khan ◽  
Arif Chowdhury ◽  
Sunita Kumari ◽  
Sahid Hussain
Keyword(s):  
Metal Ions ◽  
Toxic Metal ◽  
Adsorption Properties ◽  
Organic Dye ◽  
Soft Template ◽  
Toxic Metal Ions ◽  
Controlled Morphology

ZnIn2S4 nanostructures were fabricated with controlled morphology and utilized for the adsorption of an organic dye and toxic metal ions.

scholarly journals Tuning the sensitivity towards mercury via cooperative binding to d-fructose: dual fluorescent chemosensor based on 1,8-naphthyridine-boronic acid derivative

RSC Advances ◽  
2021 ◽  
Vol 11 (24) ◽  
pp. 14862-14870
Author(s):  
Marina Rajadurai ◽  
E. Ramanjaneya Reddy
Keyword(s):  
Metal Ions ◽  
Acid Derivative ◽  
Boronic Acid ◽  
Toxic Metal ◽  
Fluorescent Chemosensor ◽  
Cooperative Binding ◽  
Toxic Metal Ions

This new dual d-fructose–mercury chemosensor is the first example of utilizing boronic acid–diol complexation for enhancement of the sensor's sensitivity towards toxic metal ions.

scholarly journals DNA-functionalized photonic crystal microspheres for multiplex detection of toxic metal ions

2017 ◽  
Vol 154 ◽  
pp. 142-149 ◽  
Author(s):  
Zhengyu Yan ◽  
Chunqing Tian ◽  
Xincheng Qu ◽  
Weiyang Shen ◽  
Baofen Ye
Keyword(s):  
Photonic Crystal ◽  
Metal Ions ◽  
Toxic Metal ◽  
Multiplex Detection ◽  
Toxic Metal Ions

Removal of Heavy Metals from Aqueous Solution by Hydroxyapatite/Chitosan Composite

2013 ◽  
Vol 789 ◽  
pp. 176-179 ◽  
Author(s):  
Eny Kusrini ◽  
Nofrijon Sofyan ◽  
Dwi Marta Nurjaya ◽  
Santoso Santoso ◽  
Dewi Tristantini
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Metal Ions ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Removal Of Heavy Metals ◽  
Sem Micrograph ◽  
Pseudo Second Order ◽  
Chitosan Composite

Hydroxyapatite/chitosan (HApC) composite has been prepared by precipitation method and used for removal of heavy metals (Cr6+, Zn2+and Cd2+) from aqueous solution. The HAp and 3H7C composite with HAp:chitosan ratio of 3:7 (wt%) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy-energy dispersive X-ray spectroscopy. The SEM results showed that HAp is spherical-shaped and crystalline, while chitosan has a flat structure. SEM micrograph of 3H7C composite reveals crystalline of HAp uniformly spread over the surface of chitosan. The crystal structure of HAp is maintained in 3H7C composite. Chitosan affects the adsorption capacity of HAp for heavy metal ions; it binds the metal ions as well as HAp. The kinetic data was best described by the pseudo-second order. Surface adsorption and intraparticle diffusion take place in the mechanism of adsorption process. The binding of HAp powder with chitosan made the capability of composite to removal of Cr6+, Zn2+and Cd2+from aqueous solution effective. The order of removal efficiency (Cr6+> Cd2+> Zn2+) was observed.

Selective adsorption of uranyl and potentially toxic metal ions at the core-shell MFe2O4-TiO2 (M=Mn, Fe, Zn, Co, or Ni) nanoparticles

2019 ◽  
Vol 365 ◽  
pp. 835-845 ◽  
Author(s):  
Liang Bian ◽  
Jianan Nie ◽  
Xiaoqiang Jiang ◽  
Mianxin Song ◽  
Faqin Dong ◽  
...  
Keyword(s):  
Metal Ions ◽  
Selective Adsorption ◽  
Toxic Metal ◽  
Core Shell ◽  
Ni Nanoparticles ◽  
Toxic Metal Ions ◽  
The Core
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