scholarly journals Fe 3 O 4 nanoparticle-coated mushroom source biomaterial for Cr(VI) polluted liquid treatment and mechanism research

2018 ◽  
Vol 5 (5) ◽  
pp. 171776 ◽  
Author(s):  
Can Wang ◽  
Huakang Liu ◽  
Zizhao Liu ◽  
Yufeng Gao ◽  
Bin Wu ◽  
...  
Keyword(s):  
Metal Removal ◽  
Treatment Time ◽  
Heavy Metal Removal ◽  
Solution Concentration ◽  
Material Surface ◽  
Agrocybe Cylindracea ◽  
Long Term Stability ◽  
Mechanism Research ◽  
Novel Material ◽  
Langmuir Isotherm Model

Agrocybe cylindracea substrate–Fe 3 O 4 (ACS–Fe 3 O 4 ), a Fe 3 O 4 nanoparticle-coated biomaterial derived from agriculture waste from mushroom cultivation, was developed to remove hexavalent chromium (Cr(VI)) from liquid. After modification, material surface became uneven with polyporous and crinkly structure which improved Cr-accommodation ability in a sound manner. Optimized by the Taguchi method, Cr(VI) removal percentage was up to 73.88 at 240 min, 40°C, pH 3, Cr(VI) concentration 200 mg l −1 , dosage 12 g l −1 , rpm 200. The efficient Cr(VI) removal was due to the combined effect of adsorption and redox. In addition, verification test using tannery wastewater, with removal percentage of Cr(VI) and total Cr reaching 98.35 and 95.6, provided further evidence for the efficiency and feasibility of ACS–Fe 3 O 4 . The effect of storage time of the material on Cr(VI) removal was small, which enhanced its value in practical application. Results indicated that metal removal was mainly influenced by solution concentration, adsorbent dosage and treatment time. The experimental data obtained were successfully fitted with the Langmuir isotherm model. Thermodynamic study indicated the endothermic nature of the process. The results confirmed that ACS–Fe 3 O 4 as novel material derived from waste, with long-term stability, could be applied for heavy metal removal from wastewater and waste cycling.

Removal of Pb(II) by adsorption onto Chinese walnut shell activated carbon

2015 ◽  
Vol 72 (6) ◽  
pp. 983-989 ◽  
Author(s):  
Zheng-ji Yi ◽  
Jun Yao ◽  
Yun-fei Kuang ◽  
Hui-lun Chen ◽  
Fei Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Walnut Shell ◽  
Maximum Adsorption Capacity ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Chinese Walnut ◽  
Maximum Removal

The excessive discharge of Pb(II) into the environment has increasingly aroused great concern. Adsorption is considered as the most effective method for heavy metal removal. Chinese walnut shell activated carbon (CWSAC) was used as an adsorbent for the removal of Pb(II) from aqueous solution. Batch experiments were conducted by varying contact time, temperature, pH, adsorbent dose and initial Pb(II) concentration. Adsorption equilibrium was established within 150 min. Although temperature effect was insignificant, the Pb(II) adsorption was strongly pH dependent and the maximum removal was observed at pH 5.5. The Pb(II) removal efficiency increased with increasing CWSAC dosage up to 2.0 g/L and reached a maximum of 94.12%. Langmuir and Freundlich adsorption isotherms were employed to fit the adsorption data. The results suggested that the equilibrium data could be well described by the Langmuir isotherm model, with a maximum adsorption capacity of 81.96 mg/g. Adsorption kinetics data were fitted by pseudo-first- and pseudo-second-order models. The result indicated that the pseudo-first-order model best describes the adsorption kinetic data. In summary, CWSAC could be a promising material for the removal of Pb(II) from wastewater.

Adsorption of Mercury(II) Ion in Aqueous Solution by Using Bentonite-Based Monolith

2021 ◽  
Vol 885 ◽  
pp. 77-84
Author(s):  
Darmadi ◽  
Mahidin ◽  
Siti Syifa Azzahra ◽  
Munadiya Masrura
Keyword(s):  
Aqueous Solution ◽  
Metal Removal ◽  
Batch Reactor ◽  
Heavy Metal Removal ◽  
Solution Concentration ◽  
Environmental Safety ◽  
Adsorption Efficiency ◽  
Ion Removal ◽  
Non Linear ◽  
Langmuir Constants

The removal of mercury from the waterbody remains a severe challenge in ensuring environmental safety due to its highly toxic and non-biodegradable properties. Adsorption is an evidently effective method for heavy metal removal in water. This research aims to study the mercury (II) ion adsorption behavior in aqueous solution onto extruded natural bentonite in monolithic structure, bentonite-based monolith (BBM) adsorbent. BBM was characterized by XRD, BET, and SEM, the results verify BBM could improve adsorption performance assumed on its structure. Adsorption efficiency, isotherm model, and adsorption kinetic were investigated. Experiments were performed in a lab-scale batch reactor with mercury solution concentration varied from 1 to 5 mg/L. The maximum adsorption efficiency discovered to be 63,9%. The experimental data fitted well to Langmuir isotherm (non-linear) and kinetic model pseudo first order (non-linear), revealing the maximum monolayer capacity (Qo) of BBM to be 0,187 mg/g with Langmuir constants KL and aL are 0,215 L/g dan 1,151 L/mg respectively. These value confirms that BBM adsorbent encompasses tremendous potential for mercury (II) ion removal in a solution.

Application of Ambient-Temperature Argon Plasma Modified PET Fibers with Surface Grafting for Heavy Metal Removal

2014 ◽  
Vol 978 ◽  
pp. 153-156
Author(s):  
Juu En Chang ◽  
Yi Kuo Chang ◽  
Min Her Leu ◽  
Ying Liang Chen ◽  
Jing Hong Huang
Keyword(s):  
Heavy Metal ◽  
Ambient Temperature ◽  
Metal Removal ◽  
Treatment Time ◽  
Heavy Metal Removal ◽  
Monomer Concentration ◽  
Argon Plasma ◽  
Temperature Plasma ◽  
Pet Fibers ◽  
Properties Of Materials

The present study utilized the capability of ambient-temperature plasma in modifying the surface properties of materials to activate the polyethylene terephthalate (PET) fiber surfaces. The effects of different plasma treatment parameters (such as plasma power, treatment time) and grafting parameters (such as grafting temperature, acrylic acid monomer concentration, grafting time) on the activation and grafting of the PET fibers were studied. The feasibility of applying ambient-temperature plasma combined with grafting technology for the preparation of ion exchangers in the heavy metal containing wastewater treatment was evaluated.

Removal of Cr(VI) from Aqueous Solutions Using Clay from Calumbi Geological Formation, N. Sra. Socorro, SE State, Brazil

2018 ◽  
Vol 912 ◽  
pp. 1-6 ◽  
Author(s):  
J.C.T. Rezende ◽  
V.H.S. Ramos ◽  
H.A. Oliveira ◽  
Rosane Maria Pessoa Betânio Oliveira ◽  
E. Jesus
Keyword(s):  
Aqueous Solutions ◽  
Contact Time ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Initial Ph ◽  
Geological Formation ◽  
Langmuir Isotherm Model

Conventional processes for heavy metal removal are costly. Natural and modified clay with quaternary ammonium salt were used as adsorbent for the removal of Cr (VI) from aqueous solutions. Clays were characterized using Fourier transform infrared spectroscopy FTIR, thermal analysis (TG/DTA) and X-ray diffraction (XRD). Cr (VI) determination was conducted by ultraviolet-visible spectrophotometry, using complexation with 1,5-diphenylcarbazide. Absorbance was measured at the wavelength of 540 nm. The experiments were conducted at 25 ± 1 °C; initial Cr (VI) concentration of 4 to 25 mg L-1; initial pH of 2, agitation of 150 rpm; contact time of 120 minutes and clay mass of 0.1 g. Natural and modified clays exhibited a maximum adsorption capacity of 2.548 mg g-1 and 17.24 mg g-1, respectively, in accordance with the Langmuir isotherm model. X-ray diffraction analysis of clay indicated that the sample consists mainly of kaolinite and montmorillonite.

Kinetics of Mercury and Nickel Adsorption Using Chemically Pretreated Cocoa (Theobroma cacao) Husks

2019 ◽  
Vol 62 (2) ◽  
pp. 461-466 ◽  
Author(s):  
Candelaria Tejada-Tovar ◽  
Angel Villabona-Ortíz ◽  
Ángel Dario González-Delgado ◽  
María Jiménez-Villadiego
Keyword(s):  
Particle Size ◽  
Sodium Hydroxide ◽  
Adsorption Process ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Batch Adsorption ◽  
Residual Biomass ◽  
Mercury Uptake ◽  
Novel Material ◽  
Kinetics And Isotherms

Abstract. Agroindustrial wastes have been widely used to prepare adsorbents for heavy metal removal because of their low cost, accessibility, and high efficiency. This work focuses on preparing a novel material from cocoa ( L.) husk residual biomass chemically modified with sodium hydroxide for used as a biosorbent for nickel and mercury uptake. The cocoa husk residual biomass was characterized by FT-IR analysis to test the diversification of functional groups. The effect of particle size on removal yield was evaluated through batch adsorption experiments. The experimental results were fitted to mathematical models to determine the adsorption kinetics and isotherms. Particle size significantly affected the adsorption process, and the highest removal yields (91.59% and 79.96%) were achieved using 0.36 mm and 0.5 mm particles for Hg (II) and Ni (II) ions, respectively. The adsorption kinetic model that best fit the experimental data corresponded to the Elovich model, with correlation coefficients (R2) above 0.89. The adsorption process of nickel and mercury onto cocoa husk biomass followed the Freundlich isotherm model. The results show that modification with sodium hydroxide improves the adsorption capacity of cocoa husk residual biomass, indicating that this novel material could be efficiently applied for nickel and mercury uptake. Keywords: Adsorption, Heavy metals, Removal yield.

scholarly journals Kinetic Studies of Heavy Metal Removal from Industrial Wastewater by Using Natural Zeolite

2021 ◽  
Vol 5 (1) ◽  
pp. 18-25
Author(s):  
Ali Mohammed Salih ◽  
Craig Williams ◽  
Polla Khanaqa
Keyword(s):  
Heavy Metals ◽  
Natural Zeolite ◽  
Industrial Wastewater ◽  
Metal Ion ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Solution Concentration ◽  
Ion Concentration ◽  
Solution Ph ◽  
Removal Of Heavy Metals

The present work involves the study of the removal of Cu2+, Fe3+, Pb2+ and Zn2+ from synthetic metal solutions using natural zeolite. Laboratory experiments were used to investigate the efficiency of adsorbents in the uptake of heavy metals from industrial wastewater. The kinetic study was used to identify the effect of parameters that affect the rate of adsorption and evaluated their impact on the efficiency of the zeolite in the removal of heavy metals from industrial wastewater. Natural zeolite (clinoptilolite) as adsorbent contacted with multi-component synthetic solutions containing Cu2+, Fe3+, Pb2+ and Zn2+ ions without any pre-modifications and every hour 15 ml of the samples were filtered and taken for metal ion concentration analysis using the ICP-OES. The pH values were monitored and adjusted regularly. The results showed that the capacity of the adsorbents for the removal of heavy metals increased with a greater mass of absorbent, increased initial solution pH, increased agitation speed and higher solution concentration.

Influence of ultrasonication on preparation of novel material for heavy metal removal from wastewater

2016 ◽  
Vol 33 (9) ◽  
pp. 2716-2731 ◽  
Author(s):  
Saravanan Anbalagan ◽  
Senthil Kumar Ponnusamy ◽  
Sundar Rajan Panneer Selvam ◽  
Abishek Sankaranarayan ◽  
Abhishek Dutta
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Novel Material

Metal-Organic Frameworks for Heavy Metal Removal From Water

2021 ◽  
pp. 92-111
Author(s):  
Mintu Maan Dutta ◽  
Paran Jyoti Borpatra
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Anthropogenic Activities ◽  
Heavy Metal Removal ◽  
Metal Species ◽  
Essential Components ◽  
Novel Material ◽  
Metal Organic ◽  
Living Organisms ◽  
Adsorption Capability

Clean and safe drinking water is one of the most important and essential components on earth for human survival. However, due to the various anthropogenic activities, the surface and groundwater have been contaminated with heavy metals and radionuclides, and it has become a serious problem of concern globally. These non-biodegradable heavy metal ions from water tends to accumulate in the soil and living organisms and causes serious health hazards in humans. Thus, the finding of recyclable, water-stable MOFs, and multi-functional MOFs (hybrid MOFs) with superior adsorption capability have emerged as a novel material for the removal of heavy metal species (such as Cr(III)/Cr(VI), Cu(II), Hg(II), Cd(II), As(III)/As(V), Pb(II), radionuclides U(VI), Se(IV)/(VI), Cs(I) from aqueous solution. This chapter deals with the recent development of MOFs and their application in heavy metal removal from water.

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