Adsorption of Cr(VI) from wastewater by iron-modified coconut shell biochar

This study is aimed to investigate the effect of raw and Fe-modified coconut shell biochar on the adsorption of Cr(VI) in the wastewater. Fe-modified biochar was obtained from the impregnation with FeNO3 solutions and the surface functional groups of two biochars were examined by infrared spectrometer.The result showed that the Fe-modified biochar had lower abundance of the surface functional groups than that of raw biochar, and had the group of Fe-O.The removal rate of Cr(VI) increased by 94.89% compared with the raw biochar because of existing of the group of Fe-O . The removal rate of Cr(VI) by modified biochar could reach more than 99.0% when the concentration of Cr(VI) was 12μg/ mL, pH 4.0, adsorbent dosage was 0.2g and adsorption time was 2h.

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Enhanced phosphate sequestration by Fe(iii) modified biochar derived from coconut shell

RSC Advances ◽

10.1039/c8ra10400j ◽

2019 ◽

Vol 9 (18) ◽

pp. 10425-10436 ◽

Cited By ~ 7

Author(s):

Zhenxing Zhong ◽

Guowen Yu ◽

Wenting Mo ◽

Chunjie Zhang ◽

Hao Huang ◽

...

Keyword(s):

Aqueous Solution ◽

Coconut Shell ◽

Modified Biochar ◽

Coconut Shell Biochar

In this work, a novel Fe-modified coconut shell biochar (Fe-CSB) was synthesized and utilized to remove phosphate from aqueous solution.

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Adsorption of Hexavalent Chrome in Wastewater by Peanut Shell

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.71-78.3029 ◽

2011 ◽

Vol 71-78 ◽

pp. 3029-3032 ◽

Cited By ~ 1

Author(s):

Xin Zhao ◽

Chao Yu Hu ◽

Xu Yan

Keyword(s):

Room Temperature ◽

Ph Value ◽

Removal Rate ◽

Orthogonal Test ◽

Peanut Shell ◽

Adsorption Time ◽

Adsorbent Dosage ◽

Peanut Shells ◽

Hexavalent Chrome

In order to investigate the adsorption of hexavalent chrome in wastewater by peanut shell, the orthogonal test was designed to find the best adsorption conditions such as pH value, temperature, adsorption time and adsorbent dosage etc. The results show that the peanut shell is a kind of economic and efficient absorbent; hexavalent chrome removal rate can reach more than 85%, when the hexavalent chrome wastewater concentration is 30mg/L, dosing 1g peanut shells into 50mg wastewater, adjusting pH value to 2.0, adsorbing 300min at room temperature.

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Study on Tdsorption of Heavy Metalion in Metallurgical Wastewater by Montmorillonite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.461.601 ◽

2012 ◽

Vol 461 ◽

pp. 601-605

Author(s):

Xiu Yan Zhou ◽

Xiang Xin Xue ◽

Yu Hua Zhao ◽

Ou Liu

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Adsorption Capacity ◽

Removal Rate ◽

Adsorption Time ◽

Adsorbent Dosage ◽

Temperature Conditions ◽

Multiple Heavy Metals

In this study, the sorption of single heavy metal (Cu2+, Pb2+ and Zn2+) and multiple heavy metals in simulated metallurgical wastewater by montmorillonite was investigated. The effect of adsorption time and temperature conditions, etc. on the adsorption was also studied. The results showed that in the same concentration of adsorbent dosage, removal rate of single heavy metal is the highest (99.9%, 88.1% and 98.3%) when the concentration of Cu2+, Pb2+ and Zn2+ is 50 mg/L, 20mg/L and 100mg/L, respectively. The adsorption of multiple heavy metals in simulated metallurgical wastewater is the highest in 4 hours at 20°C. The adsorption capacity is in order of Pb2+≈Zn2+>Cu2+>Cd2+ and removal rate is 90.8%, 87.3%, 70.0% and 51.6%, respectively.

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Study on the Adsorption Effect of ZnCl2-Modified Pomelo Peel Powder on Wastewater Containing Pb (II)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.2320 ◽

2013 ◽

Vol 726-731 ◽

pp. 2320-2323 ◽

Cited By ~ 2

Author(s):

Qing Shan Pan ◽

Wei Liu ◽

Mei Gui Mao ◽

He Ping Yan ◽

Du Shu Huang ◽

...

Keyword(s):

Chemical Modification ◽

Removal Rate ◽

Adsorption Effect ◽

Adsorption Time ◽

Initial Concentration ◽

Adsorbent Dosage ◽

Pomelo Peel ◽

Effects Of Ph

The modified pomelo peel powder was prepared by using chemical modification methods of ZnCl2soaking and heating.The removal rate of Pb (II) ion in simulation of wastewater by the modified pomelo peel powder was tested. The effects of pH of wastewater, initial concentrations of Pb (II) ion, adsorbent dosage,temperature and time on adsorption of Pb (II) ion was studied. Results show that when Pb (II) ion initial concentration at 100 mgL-1, pH of wastewater at 3.5-5.5, adsorption time at 100min, adsorbent dosage at 15gL-1, temperature at 35°C, the removal rate of Pb (II) ion in simulation of wastewater by the modified pomelo peel powder was more than 95%.

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Efficient Removal of Cd (II) From Aqueous Solution By Chitosan Modified Kiwi Branch Biochar

10.21203/rs.3.rs-612586/v1 ◽

2021 ◽

Author(s):

Yuehui Tan ◽

Xirui Wan ◽

Xue Ni ◽

Le Wang ◽

Ting Zhou ◽

...

Keyword(s):

Functional Groups ◽

Low Cost ◽

Maximum Adsorption Capacity ◽

Surface Functional Groups ◽

Order Model ◽

Efficient Removal ◽

Adsorption Ability ◽

Modified Biochar ◽

Pseudo Second Order ◽

Interaction Surface

Abstract A novel chitosan-modified kiwi branch biochar (CHKB) was successfully fabricated as cut-price modified biochar to remove Cd (II) from wastewater. Characterization experiments with SEM-EDS, FTIR and XPS suggested that CHKB had more cations and surface functional groups compared with the original kiwi biochar (KB). The adsorption experiment results of Cd (II) on CHKB showed that the adsorption isotherms can be described best by the Langmuir model and that the pseudo-second-order model fits the Cd (II) adsorption kinetics well, indicating that the process was monolayer and controlled by chemisorption. CHKB exhibited the Langmuir maximum adsorption capacity of Cd (II) (126.58 mg g-1), however, that of KB is only 4.26 mg g-1. The adsorption ability of CHKB was improved by the increase of the surface area and abundant surface functional groups (-OH, -NH, C=O and so on). And the cation exchange, electrostatic interaction, surface complexation and precipitation were main mechanisms in the sorption of Cd (II) on CHKB. In addition, CHKB can be regenerated and reused for Cd (II) sorption by the eluent of EDTA-2Na. Excellent adsorption performance, low-cost, and environmental-friendly made CHKB become the fantastic adsorbent to remove Cd (II) in wastewater.

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Adsorption of Cu2+ from Aqueous Solution by Walnut Shell

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.864-867.1327 ◽

2013 ◽

Vol 864-867 ◽

pp. 1327-1332 ◽

Cited By ~ 1

Author(s):

Xiu Guo Lu ◽

Pei Pei Yan ◽

Xiao Fang Dang

Keyword(s):

Aqueous Solution ◽

Particle Size ◽

Metal Ions ◽

Adsorption Capacity ◽

Removal Rate ◽

Equilibrium Concentration ◽

Walnut Shell ◽

Adsorption Time ◽

Adsorbent Dosage ◽

Initial Ph

Walnut shell was used as adsorbent to remove Cu2+ metal ions from the simulated aqueous solution. The influence of factors, namely: particle size, initial pH, oscillation intensity, adsorbent dosage and adsorption time were investigated through single factor experiments.The results show that, the adsorption capacity reached the peak for Cu2+ in 25°C when the initial pH was 5, particle size was 1.25~1.6mm, adsorbent dosage was2.5g, oscillation speed reached 200r/min, and the adsorption time was 360min, all above leads the removal rate of Cu2+reached 75.7%, and the adsorption capacity of Cu2+ 0.702 mg/g. The pseudo-second-order model was fitted to describe the adsorption of Cu2+ , it was shown that adsorption rate for the metal ions in proportion to the square of the concentration.The equilibrium concentration of adsorption fitted well with Langmuir isotherm equation, the process of adsorption was single molecular layer adsorption.

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Catalytic Wet Air Oxidation of Phenol over Oxidized Activated Carbon

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.345.176 ◽

2013 ◽

Vol 345 ◽

pp. 176-179

Author(s):

Guo Yang ◽

Xing Yong Liu ◽

Fu Tao Wang

Keyword(s):

Catalytic Activity ◽

Activated Carbon ◽

Functional Groups ◽

Removal Rate ◽

Carbon Surface ◽

Air Oxidation ◽

Wet Air Oxidation ◽

Surface Functional Groups ◽

Modified Activated Carbon ◽

Oxidized Activated Carbon

A commercial activated carbon was oxidized with nitric acid to tailor the structure of pore and adjust the distribution of surface functional groups. The textual properties of catalysts was characterized using N2adsorption, and Boehm titration was applied to quantitative analysis of the functional groups on activated carbon surface. The catalytic activity of modified activated carbon was performed by trickle bed at specific temperature and pressure. The oxidized activated carbon displayed lower removal rate for phenol. This phenomenon was reasonably interpreted by small specific surface area and increase in oxygen-containing surface functional groups. The catalytic activity test showed that higher reaction temperature and higher oxygen partial pressure were favorable for phenol conversion.

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A novel eutectic solvent precursor for efficiently preparing N-doped hierarchically porous carbon nanosheets with unique surface functional groups and micro-pores towards dual-carbon lithium-ion capacitors

Journal of Materials Chemistry A ◽

10.1039/d1ta03071j ◽

2021 ◽

Author(s):

Kaixiang Zou ◽

Yuanfu Deng ◽

Weijing Wu ◽

Shiwei Zhang ◽

Guohua Chen

Keyword(s):

Functional Groups ◽

Porous Carbon ◽

High Performance ◽

Electrode Materials ◽

Lithium Ion ◽

Surface Functional Groups ◽

Carbon Nanosheets ◽

Hierarchically Porous ◽

Li Ion ◽

Unique Surface

High performance carbon-based materials are ideal electrode materials for Li-ion capacitors (LICs), but there are still many challenges such as the complicated preparation preocesses, high cost and low yield. Also,...

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