Separation of Cd(ii) and Ni(ii) in a binary mixture through competitive adsorption and acid leaching

RSC Advances ◽  
2015 ◽  
Vol 5 (113) ◽  
pp. 92885-92892 ◽  
Author(s):  
Hong Guo ◽  
Shufen Zhang ◽  
Zinong Kou ◽  
Shangru Zhai ◽  
Wei Ma ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Binary Mixture ◽  
Aqueous Solutions ◽  
Environmental Protection ◽  
Competitive Adsorption ◽  
Acid Leaching

Different heavy metals present simultaneously in aqueous solutions should be separated to promote environmental protection.

Competitive adsorption of heavy metals onto sesame straw biochar in aqueous solutions

Chemosphere ◽  
2016 ◽  
Vol 142 ◽  
pp. 77-83 ◽  
Author(s):  
Jong-Hwan Park ◽  
Yong Sik Ok ◽  
Seong-Heon Kim ◽  
Ju-Sik Cho ◽  
Jong-Soo Heo ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Competitive Adsorption

scholarly journals Single and Binary Adsorption Behaviour and Mechanisms of Cd2+, Cu2+ and Ni2+ onto Modified Biochar in Aqueous Solutions

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1829
Author(s):  
Liwen Zheng ◽  
Yongchao Gao ◽  
Jianhua Du ◽  
Wen Zhang ◽  
Yujie Huang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Aqueous Solutions ◽  
Competitive Adsorption ◽  
Adsorption Behaviour ◽  
Metal System ◽  
Adsorption Ability ◽  
Magnetic Biochar ◽  
Adsorption Sites ◽  
Adsorption Capacities

The chitosan–EDTA modified magnetic biochar (E–CMBC) was successfully used as a novel adsorbent to remove heavy metals. The adsorption behaviour and mechanisms of E–CMBC to Cd2+, Cu2+ and Ni2+ were performed in single and binary system in aqueous solutions. In single–metal system, the adsorption process of Cd2+, Cu2+ and Ni2+ on E–CMBC fitted well with the Avrami fractional–order kinetics model and the Langmuir isotherm model. The measured maximum adsorption capacities were 61.08 mg g−1, 48.36 mg g−1 and 41.17 mg g−1 for Cd2+, Cu2+ and Ni2+, respectively. In binary–metal system, coexisting ions have obvious competitive adsorption behaviour on E–CMBC when the concentration of heavy meal beyond 20 mg L−1. The maximum adsorption capacities of the heavy metals were found to be lower than that in single–metal system. The order of the competitive adsorption ability was Cu2+ > Ni2+ > Cd2+. Interestingly, in Cd2+–Cu2+ system the earlier adsorbed Cd2+ could be completely replaced by Cu2+ from the solution. Different competitive adsorption ability of those heavy metal were due to the characteristics of heavy metal and resultant affinity of the adsorption sites on E–CMBC. The adsorption mechanism indicated that chemical adsorption played a dominating role. Therefore, E–CMBC could be a potential adsorbent for wastewater treatment.

Utilisation of Biomass and Hybrid Biochar from Elephant Grass and Low Density Polyethylene for the Competitive Adsorption of Pb(II), Cu(II), Fe(II) and Zn(II) from Aqueous Media

2020 ◽  
Vol 13 ◽  
Author(s):  
Joshua O. Ighalo ◽  
Lois T. Arowoyele ◽  
Samuel Ogunniyi ◽  
Comfort A. Adeyanju ◽  
Folasade M. Oladipo-Emmanuel ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Removal Efficiency ◽  
Contact Time ◽  
Competitive Adsorption ◽  
Adsorption Process ◽  
Aqueous Media ◽  
Polluted Water ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Elephant Grass

Background: The presence of pollutants in polluted water is not singularized hence pollutant species are constantly in competition for active sites during the adsorption process. A key advantage of competitive adsorption studies is that it informs on the adsorbent performance in real water treatment applications. Objective: This study aims to investigate the competitive adsorption of Pb(II), Cu(II), Fe(II) and Zn(II) using elephant grass (Pennisetum purpureum) biochar and hybrid biochar from LDPE. Method: The produced biochar was characterised by Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The effect of adsorption parameters, equilibrium isotherm modelling and parametric studies were conducted based on data from the batch adsorption experiments. Results: For both adsorbents, the removal efficiency was >99% over the domain of the entire investigation for dosage and contact time suggesting that they are very efficient for removing multiple heavy metals from aqueous media. It was observed that removal efficiency was optimal at 2 g/l dosage and contact time of 20 minutes for both adsorbent types. The Elovich isotherm and the pseudo-second order kinetic models were best-fit for the competitive adsorption process. Conclusion: The study was able to successfully reveal that biomass biochar from elephant grass and hybrid biochar from LDPE can be used as effective adsorbent material for the removal of heavy metals from aqueous media. This study bears a positive implication for environmental protection and solid waste management.

Oxidized eucalyptus charcoal: a renewable biosorbent for removing heavy metals from aqueous solutions

2021 ◽  
Author(s):  
Elias Costa de Souza ◽  
Alexandre Santos Pimenta ◽  
Alfredo José Ferreira da Silva ◽  
Paula Fabiane Pinheiro do Nascimento ◽  
Joshua O. Ighalo
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions

Enhancement of heavy metals recovery from aqueous solutions by cementation on a rotating cylinder using a stationary wiper

2021 ◽  
Vol 97 ◽  
pp. 460-465
Author(s):  
M.S. Ahmed ◽  
T.M. Zewail ◽  
E-S.Z. El-Ashtoukhy ◽  
H.A. Farag ◽  
I.H. El Azab ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Rotating Cylinder ◽  
Metals Recovery

A green, porous and eco-friendly magnetic geopolymer adsorbent for heavy metals removal from aqueous solutions

2019 ◽  
Vol 215 ◽  
pp. 1233-1245 ◽  
Author(s):  
Ali Maleki ◽  
Zoleikha Hajizadeh ◽  
Vajiheh Sharifi ◽  
Zeynab Emdadi
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Heavy Metals Removal ◽  
Metals Removal

Development of a method for detecting trace metals in aqueous solutions based on the coordination chemistry of hexahydrotriazines

The Analyst ◽  
2015 ◽  
Vol 140 (15) ◽  
pp. 5184-5189 ◽  
Author(s):  
Rudy J. Wojtecki ◽  
Alexander Y. Yuen ◽  
Thomas G. Zimmerman ◽  
Gavin O. Jones ◽  
Hans W. Horn ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Coordination Chemistry ◽  
Trace Metals ◽  
Aqueous Solutions ◽  
Detection System ◽  
Low Cost ◽  
System P ◽  
Chemical Indicator

The detection of trace amounts (<10 ppb) of heavy metals in aqueous solutions is described using hexahydrotriazines as a chemical indicator and a low cost fluorimeter-based detection system.

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