Oxygen-functionalized Typha angustifolia biochars derived from various pyrolysis temperatures: Physicochemical properties, heavy metal capture behaviors and mechanism

Experiments on the real possibility of employing microorganisms to capture inorganic polluting substances, mainly heavy metals from urban and industrial wastes, are running using bacteria biomass. Many strains of Arthrobacter spp., gram-negative bacteria, diffused in the soil also inacondition of environmental stresses, have been proved to be particulary effective in heavy metal capture (Cd, Cr, Pb, Cu, Zn). The active and passive processes in accumulation of metals by bacteria were studied. Our experiments have been done on fluid biomass and on a membrane both for practical use and for an easy recovery.

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Temporal variation of heavy metal accumulation and translocation characteristics of narrow-leaved cattail (Typha angustifolia L.)

Environmental Science and Pollution Research ◽

10.1007/s11356-015-4979-4 ◽

2015 ◽

Vol 22 (22) ◽

pp. 17886-17896 ◽

Cited By ~ 7

Author(s):

Fatih Duman ◽

Erkan Urey ◽

Fatih Dogan Koca

Keyword(s):

Heavy Metal ◽

Temporal Variation ◽

Metal Accumulation ◽

Heavy Metal Accumulation ◽

Typha Angustifolia

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Preparation and Characterization of High-Efficiency Magnetic Heavy Metal Capture Flocculants

Water ◽

10.3390/w13131732 ◽

2021 ◽

Vol 13 (13) ◽

pp. 1732

Author(s):

Yuanyuan Yu ◽

Yongjun Sun ◽

Jun Zhou ◽

Aowen Chen ◽

Kinjal J. Shah

Keyword(s):

Heavy Metal ◽

Reaction Time ◽

High Efficiency ◽

Removal Rate ◽

Low Cost ◽

Monomer Concentration ◽

Synthesis Process ◽

Response Surface Optimization ◽

Metal Capture ◽

Total Monomer Concentration

In this study, a high-efficiency magnetic heavy metal flocculant MF@AA was prepared based on carboxymethyl chitosan and magnetic Fe3O4. It was characterized by SEM, FTIR, XPS, XRD and VSM, and the Cu(II) removal rate was used as the evaluation basis for the preparation process. The effects of AMPS content, total monomer concentration, photoinitiator concentration and reaction time on the performance of MF@AA flocculation to remove Cu(II) were studied. The characterization results show that MF@AA has been successfully prepared and exhibits good magnetic induction characteristics. The synthesis results show that under the conditions of 10% AMPS content, 35% total monomer concentration, 0.04% photoinitiator concentration, and 1.5 h reaction time, the best yield of MF@AA is 77.69%. The best removal rate is 87.65%. In addition, the response surface optimization of the synthesis process of MF@AA was performed. The optimal synthesis ratio was finally determined as iron content 6.5%, CMFS: 29.5%, AM: 53.9%, AMPS: 10.1%. High-efficiency magnetic heavy metal flocculant MF@AA shows excellent flocculation performance in removing Cu(II). This research provides guidance and ideas for the development of efficient and low-cost flocculation technology to remove Cu(II) in wastewater.

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Assessment of Physicochemical Properties and Heavy Metal Load in Soils of Ebocha Gas Flaring Site in Rivers State, Nigeria

Asian Soil Research Journal ◽

10.9734/asrj/2020/v4i230087 ◽

2020 ◽

pp. 1-9

Author(s):

O. I. Achieche ◽

O. O. Njoku ◽

C. M. Duru ◽

M. O. Nwachukwu

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Physicochemical Properties ◽

Negative Impact ◽

Soil Depth ◽

Calcium Content ◽

Gas Flaring ◽

Metal Load ◽

Acidic Nature ◽

Rivers State

The negative impact of gas flaring on the environment cannot be overemphasised. This study assessed the effect of gas flaring on the physicochemical properties and heavy metal contents in soils of Ebocha gas flaring site in Rivers State. It involved the assessment of various distances from gas flaring point to 200 meters away (50 m, 100 m, 150 m, and 200 m) which represents the extent of gas flared pollution on soils to determine the physicochemical properties and heavy metal load. The gas flaring significantly decreased soil organic carbon and calcium content when compared with non-gas flaring polluted soils. Soil acidity increased, soil exchangeable ions decreased. N, P and K were altered in gas flared soils when compared to the controls. There were detrimental effects on soils physicochemical properties. Heavy metals observed were Cd (Cadmium), Ni (Nickel), As (Arsenic), Cr (Chromium), while Pb (Lead) was not detected. The concentration of heavy metals in gas flared soils decreases down soil depth from 0-15 cm to 45-60 cm respectively. The gas flaring extremely caused the acidic nature of gas flared soils. Coefficient of variation (CV) in percentage shows significant increase in acidic nature of the gas flared soils when compared with the control soils.

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