Preferable phosphate removal by nano-La(III) hydroxides modified mesoporous rice husk biochars: Role of the host pore structure and point of zero charge

Tang, Qian; Shi, Cheng-Hao; Shi, Wenmin; Huang, Xueling; Ye, Yuanyao; Jiang, Wei; Kang, Jianxiong; Liu, Dongqi; Ren, Yongzheng; Li, Daosheng

doi:10.1016/j.scitotenv.2019.01.159

Cited by 159 publications

(46 citation statements)

References 45 publications

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“…This result is in accordance with most research results [12,45]. Tang and Zhu mentioned that carbon-rich materials with highly porous states effectively capture nitrogen and phosphate ions and exhibit fast adsorption rates [23,46]. Therefore, compared with the original biochar, the acid-and oxidation-aged biochar should have more advantages in the adsorption process.…”

Section: Resultssupporting

confidence: 88%

Characterization of Acid-Aged Biochar and Its Ammonium Adsorption in an Aqueous Solution

Wang

Zhang

et al. 2020

Materials

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According to its characteristics, biochar originating originating from biomass is accepted as a multifunctional carbon material that supports a wide range of applications. With the successfully used in reducing nitrate and adsorbing ammonium, the mechanism of biochar for nitrogen fixation in long-term brought increasing attention. However, there is a lack of analysis of the NH4+-N adsorption capacity of biochar after aging treatments. In this study, four kinds of acid and oxidation treatments were used to simulate biochar aging conditions to determine the adsorption of NH4+-N by biochar under acidic aging conditions. According to the results, acid-aged biochar demonstrated an enhanced maximum NH4+-N adsorption capacity of peanut shell biochar (PBC) from 24.58 to 123.28 mg·g−1 after a H2O2 modification. After the characteristic analysis, the acid aging treatments, unlike normal chemical modification methods, did not significantly change the chemical properties of the biochar, and the functional groups and chemical bonds on the biochar surface were quite similar before and after the acid aging process. The increased NH4+-N sorption ability was mainly related to physical property changes, such as increasing surface area and porosity. During the NH4+ sorption process, the N-containing functional groups on the biochar surface changed from pyrrolic nitrogen to pyridinic nitrogen, which showed that the adsorption on the surface of the aged biochar was mainly chemical adsorption due to the combination of π-π bonds in the sp2 hybrid orbital and a hydrogen bonding effect. Therefore, this research establishes a theoretical basis for the agricultural use of aged biochar.

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Section: Resultssupporting

confidence: 88%

Characterization of Acid-Aged Biochar and Its Ammonium Adsorption in an Aqueous Solution

Wang

Zhang

et al. 2020

Materials

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“…To date, many materials have been developed for the phosphate removal (Huang et al 2017b;Liu et al 2018;Ye et al 2017). Due to the strong specific affinity between phosphate ions and metal sites, oxides and hydroxides of metals and their modifications have been widely used to remove phosphate from wastewater (Hu et al 2017;Shi et al 2019;Tang et al 2019;Xu et al 2017).…”

Section: Introductionmentioning

confidence: 99%

The adsorption of phosphate using a magnesia–pullulan composite: kinetics, equilibrium, and column tests

Jiao²,

Kang

et al. 2019

Environ Sci Pollut Res

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Amagnesia-pullulan (MgOP) composite has been developed to remove phosphate from a synthetic solution. In the present study, the removal of phosphate by MgOP was evaluated in both a batch and dynamic system. The batch experiments investigated the initial pH effect on the phosphate removal efficiency from pH 3 to 12 and the effect of co-existing anions. In addition, the adsorption isotherms, thermodynamics, and kinetics were also investigated. The results from the batch experiments indicate that MgOP has encouraging performance for the adsorption of phosphate, while the initial pH value (3-12) had a negligible influence on the phosphate removal efficiency. Analysis of the adsorption thermodynamics demonstrated that the phosphate removal process was endothermic and spontaneous. Investigations into the dynamics of the phosphate removal process were carried out using a fixed bed of MgOP, and the resulting breakthrough curves were used to describe the column phosphate adsorption process at various bed masses, volumetric flow rates, influent phosphate concentrations, reaction temperatures, and inlet pH values. The results suggest that the adsorption of phosphate on MgOP was improved using an increased bed mass, while the reaction temperature did not significantly affect the performance of the MgOP bed during the phosphate removal process. Furthermore, higher influent phosphate concentrations were beneficial towards increasing the column adsorption capacity for phosphate. Several mathematic models, including the Adams-Bohart, Wolboska, Yoon-Nelson, and Thomas models, were employed to fit the fixed-bed data. In addition, the effluent concentration of magnesium ions was measured and the regeneration of MgOP investigated.

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“…This could be clarified by owing to the unnecessary inclusion of salt [22,[123][124][125][126]. In addition, the influence of an organic source, such as humic acid, on the absorption potential of phosphate has been thoroughly examined in the literature [127,128]. Regarding diverse anions, anions with bivalency had a higher load density of, for example, SO 4 2− and CO 3 2− , which have a higher influence on the adsorption potential of phosphate than monovalent anions, such as Cl − and NO 3 − .…”

Section: Effects Of Different Ion Concentrations On the Removal Efficiencies Of Phosphate And Ammoniummentioning

confidence: 99%

The Recovery of Phosphate and Ammonium from Biogas Slurry as Value-Added Fertilizer by Biochar and Struvite Co-Precipitation

et al. 2021

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Biowaste materials could be considered a renewable source of fertilizer if methods for recovering P from waste can be developed. Over the last few decades, there has been a high level of interest in using biochar to remove contaminants from aqueous solutions. This study was conducted using a range of salts that are commonly found in biogas slurry (ZnCl2, FeCl3, FeCl2, CuCl2, Na2CO3, and NaHCO3). Experiments with a biogas digester and aqueous solution were conducted at pH nine integration with NH4+, Mg2+, and PO43− molar ratios of 1.0, 1.2, and 1.8, respectively. The chemical analysis was measured to find out the composition of the precipitate, and struvite was employed to remove the aqueous solutions. The study found that the most efficient removal of phosphate and ammonium occurred at pH nine in Tongan sludge urban biochar and rice biochar, respectively. Increasing the concentration of phosphate and ammonium increased the phosphate and ammonium content. Moreover, increasing the biochar temperature and increasing the concentration of phosphate and ammonium increased the efficiency of the removal of ammonium and phosphate. The removal efficiency of ammonium and phosphate increased from 15.0% to 71.0% and 18.0% to 99.0%, respectively, by increasing the dose of respective ions K+, Zn2+, Fe3+, Fe2+, Cu2+, and CO32.The elements were increased from 58.0 to 71.0 for HCO3− with the increasing concentration from 30 mg L−1 to 240 mg L−1.This study concluded that phosphate and ammonium can be recovered from mushroom soil biochar and rice biochar, and phosphate can be effectively recovered via the struvite precipitation method.

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Preferable phosphate removal by nano-La(III) hydroxides modified mesoporous rice husk biochars: Role of the host pore structure and point of zero charge

Cited by 159 publications

References 45 publications

Characterization of Acid-Aged Biochar and Its Ammonium Adsorption in an Aqueous Solution

Characterization of Acid-Aged Biochar and Its Ammonium Adsorption in an Aqueous Solution

The adsorption of phosphate using a magnesia–pullulan composite: kinetics, equilibrium, and column tests

The Recovery of Phosphate and Ammonium from Biogas Slurry as Value-Added Fertilizer by Biochar and Struvite Co-Precipitation

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