Enhanced adsorption of Cd(II) from aqueous solution by a magnesium oxide–rice husk biochar composite

Xiang, Jiangxin; Lin, Qintie; Cheng, Shuailong; Guo, Jifeng; Yao, Xiaosheng; Liu, Qianjun; Yin, Geping; Liu, Dingfa

doi:10.1007/s11356-018-1594-1

Cited by 101 publications

(10 citation statements)

References 55 publications

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“…Even though BCH demonstrated higher adsorption capacity as compared to RH (being more effective in remediation processes), both amendments (BCH and RH) are very effective in immobilization of Cd by affecting its adsorption and desorption in polluted soil. Recently, Xiang et al showed that a magnesium oxide–RH biochar composite (MgO–BCR) was successfully prepared by a MgO impregnation method, and its adsorption performance was investigated in Cd (II) aqueous solution. The adsorption capacity of this composite was almost three times higher than the RH biochar alone, demonstrating that MgO–BCR composite could be used as an effective and eco‐friendly adsorbent to enhance the removal of Cd (II) from polluted aqueous solution …”

Section: Biotechnological Uses Of Rh and Its Ashesmentioning

confidence: 99%

“…The adsorption capacity of this composite was almost three times higher than the RH biochar alone, demonstrating that MgO-BCR composite could be used as an effective and eco-friendly adsorbent to enhance the removal of Cd (II) from polluted aqueous solution. 73 Low use of waste cooking oil for biodiesel production when compared with other raw materials is mainly related to its low quality. 74 A pretreatment prior to biodiesel synthesis is therefore required in these cases using materials that adsorb free fatty acids and oxidation products.…”

Section: Adsorbentsmentioning

confidence: 99%

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Use of biotechnological approaches to add value to rice hulls

Kuhn

Berghahn

Sperotto

et al. 2019

Biotechnology Progress

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One of the most common agricultural wastes generated in rice producing countries, rice hull (RH) is considered an environmental problem due to increased rice production and RH accumulation, especially because natural degradation in the environment is very difficult and time‐consuming. Currently, RH is mostly used as bed for broiler chickens or burned for energy generation, two processes that prevent environmental accumulation in a sustainable way, without adding value to the RH. To diversificate its use and effectively add some value to the RH, a pretreatment is frequently needed, allowing the application of several biotechnological approaches. In this review, we gather information about biotechnological uses of crude and processed RH, including their use as fertilizers, filler material in natural rubber and incorporation in cement for civil construction purposes, along with their use in processes as silica extraction and adsorption/removal of environmental contaminants as heavy metals and dyes. Finally, we critically evaluate the data published in the literature, and based on our own findings, we point future directions related to RH biodegradation and further methane production.

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Section: Biotechnological Uses Of Rh and Its Ashesmentioning

confidence: 99%

Section: Adsorbentsmentioning

confidence: 99%

Use of biotechnological approaches to add value to rice hulls

Kuhn

Berghahn

Sperotto

et al. 2019

Biotechnology Progress

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“…The discharge of wastewater from manufacturing industries such as pigments and plastics leads to toxic Cd entering water bodies. Furthermore, the disposal of wastes from mining and refining processes and the extensive use of phosphate fertilizers result in soil pollution by Cd (Xiang et al 2018). Cadmium in the environment is easy to be enriched in primary products and then enters into the food chain (Song et al 2017), which causes chronic poisoning.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Cd(II) adsorption by rice straw biochar through oxidant and acid modifications

Hong

Jiang

et al. 2021

Environ Sci Pollut Res

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To develop high-efficient biochar adsorbents, the effects and mechanisms of oxidant modification and acid modification on Cd(II) adsorption by rice straw biochar were investigated. Three rice straws from Langxi in Anhui Province, Yingtan in Jiangxi Province, and Lianyungang in Jiangsu Province were collected to prepare biochars by anaerobic pyrolysis in a muffle furnace. Rice straw biochars were modified by 15% H 2 O 2 and 1:1 HNO 3 /H 2 SO 4 mixed acid, respectively, to obtain modified biochars. The untreated rice straw biochar and HCl-treated rice straw biochar with carbonate removed were used as controls. The functional groups on the surfaces of the biochars were qualitatively and quantitatively determined by Fourier transform infrared spectra and Boehm titration, respectively. The adsorption and desorption of Cd(II) onto and from the biochars and modified biochars were measured under various pH conditions. The results showed that oxidant modification with 15% H 2 O 2 and acid modification with 1:1 HNO 3 /H 2 SO 4 significantly increased the number of carboxyl functional groups on the surfaces of the biochars, and acid modification was more effective than oxidant modification in amplifying carboxyl functional groups on the surfaces of the biochars. The increase of surface functional groups effectively enhanced the specific adsorption of Cd(II) on the modified biochars. Therefore, both oxidant modification and acid modification enhanced the adsorption of Cd(II) on the biochars through increasing functional groups on the surfaces of the biochars.Keywords H 2 O 2 . HNO 3 /H 2 SO 4 mixed acid . Modified biochar . Carboxyl functional groups . Cd(II) adsorption

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“…In recent years, because of its large specific surface area, richness of a variety of functional groups, easy recycling, and other advantages, biochar has been favored by many scientific researchers as a new adsorbent. , Biochar must be modified to improve its adsorption performance and environmental benefits. Xiang et al prepared a MgO–rice hull biochar complex (MgO–BCR) by impregnating and loading raw biochar with magnesium oxide. The adsorption capacity of MgO–BCR (18.10 mg·g –1 ) was much higher than that of BCR (6.36 mg·g –1 ), suggesting that in situ precipitation, surface complexation, and electrostatic attraction are the main mechanisms for Cd(II) adsorption.…”

Section: Introductionmentioning

confidence: 99%

“…14,15 Biochar must be modified to improve its adsorption performance and environmental benefits. Xiang et al 16 prepared a MgO−rice hull biochar complex (MgO−BCR) by impregnating and loading raw biochar with magnesium oxide. The adsorption capacity of MgO−BCR (18.10 mg•g −1 ) was much higher than that of BCR (6.36 mg•g −1 ), suggesting that in situ precipitation, surface complexation, and electrostatic attraction are the main mechanisms for Cd(II) adsorption.…”

Section: ■ Introductionmentioning

confidence: 99%

Superefficient Removal of Heavy Metals from Wastewater by Mg-Loaded Biochars: Adsorption Characteristics and Removal Mechanisms

Deng

Yan

et al. 2020

Langmuir

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Six types of biochar (BSB, CSB, FSB, CFSB, MSB, and TSB) were prepared from different raw materials by loading magnesium ions (Mg 2+ ) via an impregnation process. The adsorption kinetics and thermodynamics of heavy metals at high concentrations were analyzed. The adsorption mechanisms were investigated by zeta potential, scanning electron microscopy− energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and inductively coupled plasma−atomic absorption spectroscopy analyses. The adsorption of heavy metals by BSB, CSB, FSB, CFSB, MSB, and TSB conformed to the Langmuir model and PS-order. The maximum theoretical saturation adsorption capacities for Cd(II), Cu(II), and

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Enhanced adsorption of Cd(II) from aqueous solution by a magnesium oxide–rice husk biochar composite

Cited by 101 publications

References 55 publications

Use of biotechnological approaches to add value to rice hulls

Use of biotechnological approaches to add value to rice hulls

Enhancement of Cd(II) adsorption by rice straw biochar through oxidant and acid modifications

Superefficient Removal of Heavy Metals from Wastewater by Mg-Loaded Biochars: Adsorption Characteristics and Removal Mechanisms

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