Adsorption mechanisms for cadmium from aqueous solutions by oxidant-modified biochar derived from Platanus orientalis Linn leaves

2022 ◽  
pp. 128261
Author(s):  
Kaiyue Yin ◽  
Juyuan Wang ◽  
Sheng Zhai ◽  
Xin Xu ◽  
Tingting Li ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Mechanisms ◽  
Modified Biochar ◽  
Platanus Orientalis

Comparison of the fixation of several metal ions onto a low-cost biopolymer

2002 ◽  
Vol 2 (5-6) ◽  
pp. 217-224 ◽  
Author(s):  
Z. Reddad ◽  
C. Gérente ◽  
Y. Andrès ◽  
P. Le Cloirec
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Low Cost ◽  
Operating Conditions ◽  
Order Kinetic ◽  
Adsorption Mechanisms ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Beet Pulp ◽  
Removal Of Metal Ions

In the present work, sugar beet pulp, a common waste from the sugar refining industry, was studied in the removal of metal ions from aqueous solutions. The ability of this cheap biopolymer to sorb several metals namely Pb2+, Cu2+, Zn2+, Cd2+ and Ni2+ in aqueous solutions was investigated. The metal fixation capacities of the sorbent were determined according to operating conditions and the fixation mechanisms were identified. The biopolymer has shown high elimination rates and interesting metal fixation capacities. A pseudo-second-order kinetic model was tested to investigate the adsorption mechanisms. The kinetic parameters of the model were calculated and discussed. For 8 × 10-4 M initial metal concentration, the initial sorption rates (v0) ranged from 0.063 mmol.g-1.min-1 for Pb2+ to 0.275 mmol.g-1.min-1 for Ni2+ ions, with the order: Ni2+ > Cd2+ > Zn2+ > Cu2+ > Pb2+. The equilibrium data fitted well with the Langmuir model and showed the following affinity order of the material: Pb2+ > Cu2+ > Zn2+ > Cd2+ > Ni2+. Then, the kinetic and equilibrium parameters calculated qm and v0 were tentatively correlated to the properties of the metals. Finally, equilibrium experiments in multimetallic systems were performed to study the competition of the fixation of Pb2+, Zn2+ and Ni2+ cations. In all cases, the metal fixation onto the biopolymer was found to be favourable in multicomponent systems. Based on these results, it is demonstrated that this biosorbent represents a low-cost solution for the treatment of metal-polluted wastewaters.

scholarly journals Sustainable Chromium (VI) Removal from Contaminated Groundwater Using Nano-Magnetite-Modified Biochar via Rapid Microwave Synthesis

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 103
Author(s):  
Xiaoming Song ◽  
Yuewen Zhang ◽  
Nan Cao ◽  
Dong Sun ◽  
Zhipeng Zhang ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Microwave Treatment ◽  
Contaminated Groundwater ◽  
Maximum Adsorption Capacity ◽  
Intraparticle Diffusion Model ◽  
Adsorption Mechanisms ◽  
Chromium Vi ◽  
Modified Biochar ◽  
Pseudo Second Order ◽  
Nano Fe3o4

This study developed a nano-magnetite-modified biochar material (m-biochar) using a simple and rapid in situ synthesis method via microwave treatment, and systematically investigated the removal capability and mechanism of chromium (VI) by this m-biochar from contaminated groundwater. The m-biochar was fabricated from reed residues and magnetically modified by nano-Fe3O4. The results from scanning electron microscopy (SEM) and X-ray diffraction (XRD) characterisations confirmed the successful doping of nano-Fe3O4 on the biochar with an improved porous structure. The synthesised m-biochar exhibited significantly higher maximum adsorption capacity of 9.92 mg/g compared with that (8.03 mg/g) of the pristine biochar. The adsorption kinetics followed the pseudo-second-order model and the intraparticle diffusion model, which indicated that the overall adsorption rate of Cr(VI) was governed by the processes of chemical adsorption, liquid film diffusion and intramolecular diffusion. The increasing of the pH from 3 to 11 significantly affected the Cr(VI) adsorption, where the capabilities decreased from 9.92 mg/g to 0.435 mg/g and 8.03 mg/g to 0.095 mg/g for the m-biochar and pristine biochar, respectively. Moreover, the adsorption mechanisms of Cr(VI) by m-biochar were evaluated and confirmed to include the pathways of electrostatic adsorption, reduction and complexation. This study highlighted an effective synthesis method to prepare a superior Cr(VI) adsorbent, which could contribute to the effective remediation of heavy metal contaminations in the groundwater.

Quantitative analysis on the mechanism of Cd2+ removal by MgCl2-modified biochar in aqueous solutions

2021 ◽  
pp. 126487
Author(s):  
Guangcai Yin ◽  
Lin Tao ◽  
Xinglin Chen ◽  
Nanthi S. Bolan ◽  
Binoy Sarkar ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Aqueous Solutions ◽  
Modified Biochar

scholarly journals Qualitative and quantitative adsorption mechanisms of zinc ions from aqueous solutions onto dead carp derived biochar

RSC Advances ◽  
2021 ◽  
Vol 11 (60) ◽  
pp. 38273-38282
Author(s):  
Hong-tao Qiao ◽  
Yong-sheng Qiao ◽  
Xiao-hang Luo ◽  
Bao-wei Zhao ◽  
Qiu-ying Cai
Keyword(s):  
Aqueous Solutions ◽  
Pyrolysis Temperature ◽  
Zinc Ions ◽  
Adsorption Mechanisms ◽  
Qualitative And Quantitative

The adsorption mechanisms of Zn2+ on carp biochars mainly include precipitation with minerals, exchange with cations, and complexation with OFGs. The pyrolysis temperature of carp biochars has a significant effect on the mechanisms of Zn2+ adsorption.

scholarly journals Highly efficient removal of diazinon pesticide from aqueous solutions by using coconut shell-modified biochar

2020 ◽  
Vol 13 (7) ◽  
pp. 6106-6121 ◽  
Author(s):  
Nor Atikah Baharum ◽  
Hanisah Mohmad Nasir ◽  
Mohd Yusoff Ishak ◽  
Noorain Mohd Isa ◽  
Mohd Ali Hassan ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Coconut Shell ◽  
Efficient Removal ◽  
Highly Efficient ◽  
Modified Biochar

Benign zinc oxide betaine-modified biochar nanocomposites for phosphate removal from aqueous solutions

2020 ◽  
Vol 272 ◽  
pp. 111048 ◽  
Author(s):  
Amita Nakarmi ◽  
Shawn E. Bourdo ◽  
Laura Ruhl ◽  
Sushil Kanel ◽  
Mallikarjuna Nadagouda ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Aqueous Solutions ◽  
Phosphate Removal ◽  
Modified Biochar

Enhanced adsorption performance of tetracycline in aqueous solutions by methanol-modified biochar

2014 ◽  
Vol 248 ◽  
pp. 168-174 ◽  
Author(s):  
Xiang-Rong Jing ◽  
Yuan-Ying Wang ◽  
Wu-Jun Liu ◽  
Yun-Kun Wang ◽  
Hong Jiang
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Performance ◽  
Modified Biochar ◽  
Enhanced Adsorption

Ammonium removal from aqueous solutions by fixed-bed column using corncob-based modified biochar

2017 ◽  
Vol 40 (6) ◽  
pp. 683-692 ◽  
Author(s):  
Lan Huong Nguyen ◽  
Thi Mai Vu ◽  
Thi Trinh Le ◽  
Van Tuyen Trinh ◽  
Thi Pha Tran ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
Ammonium Removal ◽  
Modified Biochar
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