Synthesis of a stable magnesium-impregnated biochar and its reduction of phosphorus leaching from soil

Chen, Qincheng; Qin, Jiaolong; Cheng, Zhiwen; Huang, Lu; Sun, Peng; Chen, Lu; Shen, Guoqing

doi:10.1016/j.chemosphere.2018.02.058

Cited by 87 publications

(20 citation statements)

References 44 publications

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“…The SEM and EDX mapping analysis of Mg-impregnated biochars also showed that Mg elements had been successfully loaded on the biochar. According to the previous studies, it was speculated that the Mg-compounds on the treated biochar may contain MgSO 4 , MgO, Mg(OH) 2 and other Mg chemicals [28,37,38]. However, the EDX mapping analysis showed large blocky Mg particles in WCM615 and WCM630 but not in WCM315 and WCM330, suggesting that the biochars may be impregnated with different Mg compounds.…”

Section: Physicochemical Propertiesmentioning

confidence: 98%

“…In particular, compared with the pristine biochar tested in our previous study [25], extra -OH was generated on Mg-impregnated biochar pyrolyzed at 600°C, which may increase the adsorption ability of biochars to LEV. Previous studies also indicated that different from the original biochar, -OH (bonded) was generated on the Mg-impregnated biochar pyrolyzed at 600°C [37].The FTIR peaks with high intensity of WCM615 and WCM630 at about 3700 cm −1 can be attributed to the A 2u (OH) lattice vibration of Mg (OH) 2 [39,40]. A series of bands recorded in the 400-800 cm -1 region can be ascribed to the Mg-O and O-Mg-O [41], suggesting the presence of Mg oxyhydroxides.…”

Section: Physicochemical Propertiesmentioning

confidence: 99%

“…FTIR spectra of Mg-impregnated biochars before and after adsorption of LEV showed the following differences: 1) the peaks of WCM615 and WCM630 in region around 1100-1200 cm −1 disappeared after sorption, suggesting the involvement of phenolic -OH (~1200 cm −1 ) and C-O-C (~1100 cm −1 ) [52]; 2) some peaks (~935, 717, 600 cm −1 ) of WCM615 disappeared after adsorption of LEV, suggesting the involvement of aromatic CH [53]; and 3) the intensive of peaks in WCM315 and WCM330 between 3378 and 3693 cm −1 increased after adsorption of LEV, suggesting the involvement of -OH [54]. For another, Mg-pretreated biomass usually endow more positive charge on the biochar surface, which may also increase the adsorption of levofloxacin on biochar [36,37].…”

Section: Batch Sorptionmentioning

confidence: 99%

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Removal of Levofloxacin from aqueous solution by Magnesium-impregnated Biochar: batch and column experiments

Zhao

Dong

et al. 2018

Chemical Speciation & Bioavailability

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Adsorption of levofloxacin (LEV) onto four types of magnesium (Mg)-impregnated biochars, fabricated via thermal pyrolysis of wood chips pretreated with MgSO 4 was investigated. The Mg-impregnated biochars were characterized with various tools and techniques. Batch sorption experiments were conducted to determine the sorption kinetics and isotherms of LEV onto the Mg-impregnated biochars. The pseudo-second order kinetic model described the adsorption kinetic data better than the pseudo-first order kinetic model and the Elovich equation. Due to multi-mechanisms, the Freundlich model described the experimental isotherms better than the Langmuir model. The Langmuir maximum adsorption capacities of the Mg-impregnated biochars to LEV ranged from 7.38 to 25.2 mg g −1. In the fixed-bed column experiment, higher bed height and lower flow rate led to greater LEV removal. Findings from this work indicate that Mg-impregnated biochars can be used as an alternative adsorbent to effectively remove LEV from aqueous solutions.

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Section: Physicochemical Propertiesmentioning

confidence: 98%

Section: Physicochemical Propertiesmentioning

confidence: 99%

Section: Batch Sorptionmentioning

confidence: 99%

See 1 more Smart Citation

Removal of Levofloxacin from aqueous solution by Magnesium-impregnated Biochar: batch and column experiments

Zhao

Dong

et al. 2018

Chemical Speciation & Bioavailability

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“…Globally, China was the largest producer of meat in recent two decades, the total amount of breeding animals reached 855 million tons in 2016 [3]. Meanwhile, the huge amount of manures and slurries with a total yield of 8.3 billion tons had caused a series of environmental problems, such as greenhouse gas emissions, land-use change, odor and airborne ammonia [4][5][6]. Therefore, livestock was one of the most significant contributors to present serious environmental problems [7].…”

Section: Introductionmentioning

confidence: 99%

Immobilization and assessment of heavy metals in chicken manure compost amended with rice straw-derived biochar

Xue

et al. 2021

Environmental Pollutants and Bioavailability

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In this study, a 30-days laboratory experiment was implemented to investigate the impact of additive biochar on the stabilization of heavy metals in chicken manure compost. Results showed that after the addition of rice straw-derived biochar, heavy metals were more stabilized except Cu, of which the residual fractions distinctly decreased due to the interaction with organic functional groups from biochar. Given the bioavailability of heavy metals, the biochar addition at a 10% proportion decreased the concentration of CaCl2-extractable Cr, Zn, Ni, and Cd. Besides, CaCl2-extractable As did not differ significantly between treatments with and without biochar addition. Furthermore, the CaCl2-extractable Cu was higher than the control, in agreement with the observed changes in speciation. Environment pollution assessment by integrating potential ecological risk assessment explicated the chicken manure compost reached avery high-risk pollution level, and decreased with biochar addition. Therein, Cd was the dominant pollutant with very high potential risk.

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“…Nevertheless, the pristine biochar usually has a small or negative adsorption capacity for phosphate [ 10 ]. Impregnation of the biomass with metal salts before pyrolysis, among which Al [ 11 – 13 ], Ca [ 14 , 15 ], Fe [ 16 , 17 ], La [ 18 , 19 ] and Mg [ 20 – 22 ] salts are more commonly used, to produce modified biochars loaded with metal oxides, could increase the phosphate adsorption capacity of the biochar due to the good phosphate affinity of the metal oxides [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

A comparative study on phosphate removal from water using Phragmites australis biochars loaded with different metal oxides

et al. 2021

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Metal oxide-loaded biochars are a promising material to remove phosphate from polluted water to ultra-low concentrations. To facilitate preparing the metal oxide-loaded biochar with the best phosphate adsorption performance, five biochars loaded with Al, Ca, Fe, La and Mg oxides, respectively (Al-BC, Ca-BC, Fe-BC, La-BC and Mg-BC) were produced using Phragmites australis pretreated with 0.1 mol AlCl 3 , CaCl 2 , FeCl 3 , LaCl 3 and MgCl 2 , respectively, characterized, and phosphate adsorption kinetics and isotherms of the biochars were determined. The maximum phosphate adsorption capacities ( Q m ) of the biochars ranked as Al-BC (219.87 mg g −1 ) > Mg-BC (112.45 mg g −1 ) > Ca-BC (81.46 mg g −1 ) > Fe-BC (46.61 mg g −1 ) > La-BC (38.93 mg g −1 ). The time to reach the adsorption equilibrium ranked as La-BC (1 h) < Ca-BC (12 h) < Mg-BC (24 h) = Fe-BC (24 h) <Al-BC (greater than 72 h). Q m of Ca-BC, Fe-BC, La-BC and Mg-BC depend on the molar content of metals in the biochars. The small phosphate adsorption rate of Al-BC is due to the slow intra-particle diffusion of phosphate attributed to the undeveloped porosity and dispersed distribution of AlOOH crystals on the Al-BC surface. Mg-BC is suggested for phosphate removal from water considering adsorption rate and capacity. Al-BC is applicable when a long contact time is allowed, e.g. as a capping material to immobilize phosphate in lake sediments.

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Synthesis of a stable magnesium-impregnated biochar and its reduction of phosphorus leaching from soil

Cited by 87 publications

References 44 publications

Removal of Levofloxacin from aqueous solution by Magnesium-impregnated Biochar: batch and column experiments

Removal of Levofloxacin from aqueous solution by Magnesium-impregnated Biochar: batch and column experiments

Immobilization and assessment of heavy metals in chicken manure compost amended with rice straw-derived biochar

A comparative study on phosphate removal from water using Phragmites australis biochars loaded with different metal oxides

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