Adsorption of sulfate ion from water by zirconium oxide-modified biochar derived from pomelo peel

Ao, Hanting; Cao, Wei; Hong, Yixia; Wu, Jun; Wei, Lin

doi:10.1016/j.scitotenv.2019.135092

Cited by 76 publications

(33 citation statements)

References 49 publications

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“…For the separation factor R L (R L = 1/(1 + R L C 0 ), when R L > 1, the adsorption is unfavorable; when 0 < R L < 1, the adsorption is favorable; when R L = 1, the adsorption is linear [62]. In the Langmuir model, the R L of biochar for Cd 2+ is between zero and one, indicating that the adsorption behavior of biochar to Cd 2+ is favorable.…”

Section: Samplesmentioning

confidence: 99%

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Zhu

Liang

et al. 2020

Water

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Removal of aquatic cadmium ions using biochar is a low-cost method, but the results are usually not satisfactory. Modified biochar, which can be a low-cost and efficient material, is urgently required for Cd-polluted water and soil remediation. Herein, poplar bark (SB) and poplar sawdust (MB) were used as raw materials to prepare modified biochar, which is rich in N- and S- containing groups, i.e., TSBC-600 and TMBC-600, using a co-pyrolysis method with thiourea. The adsorption characteristics of Cd2+ in simulated wastewater were explored. The results indicated that the modification optimized the surface structure of biochar, Cd2+ adsorption process by both TSBC-600 and TMBC-600 was mainly influenced by the initial pH, biochar dosage, and contact time, sthe TSBC-600 showed a higher adsorption capacity compared to TMBC-600 under different conditions. The Langmuir adsorption isotherm model and pseudo-second-order kinetic model were more consistent with the adsorption behavior of TSBC-600 and TMBC-600 to Cd2+, the maximum adsorption capacity of TSBC-600 and TMBC-600 calculated by the Langmuir adsorption isotherm model was 19.998 mg/g and 9.631 mg/g, respectively. The modification method for introducing N and S into biochar by the co-pyrolysis of biomass and thiourea enhanced the removal rate of aquatic cadmium ions by biochar.

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Section: Samplesmentioning

confidence: 99%

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Zhu

Liang

et al. 2020

Water

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“…Adsorption separation is widely used because of its rapid and effective removal of the sulfate ion (Ao et al, 2020). The adsorption method relies on electrostatic attractions which lead to anions binding onto various positively charged sites at material surfaces.…”

Section: Adsorption Of Sulfatementioning

confidence: 99%

“…This process generally occurs on the surface of minerals such as metallic oxides (Al, Fe), but also on soil components such as allophanes (typical of volcanic soils). The process may also be achieved through ligand exchange (Ao et al, 2020). The adsorption of sulfate is pH dependent, and acidic conditions favor the adsorption (Ao et al, 2020), which is suitable for AMD treatment.…”

Section: Adsorption Of Sulfatementioning

confidence: 99%

“…The process may also be achieved through ligand exchange (Ao et al, 2020). The adsorption of sulfate is pH dependent, and acidic conditions favor the adsorption (Ao et al, 2020), which is suitable for AMD treatment.…”

Section: Adsorption Of Sulfatementioning

confidence: 99%

“…Recently, biochar has attracted great attention as an alternative desirable adsorbent and catalyst support due to its porous structure, low cost and environmental compatibility (Jung & Ahn, 2016). Biochar is usually prepared from agricultural wastes, such as wood, corn cob, rice straw, rice and fruit husks, and organic wastes (Ao et al, 2020;Gebrewold et al, 2019). However, ordinary biochar has shown poor adsorption capacity toward anionic species due to its negative surface charge (Bian et al, 2014;Gebrewold et al, 2019;Kameyama et al, 2016).…”

Section: Adsorption Of Sulfatementioning

confidence: 99%

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Treatment and reuse of solid materials containing inorganic sulfur compounds

Tichý¹,

Kijjanapanich²,

Lens³

2020

Environmental Technologies to Treat Sulphur Pollution: Principles and Engineering

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In the environment, different types of solid phase systems can contain high concentrations of inorganic sulfurous compounds, e.g. ores, soils and sediments. The key criterion in the assessment of environmental risks of inorganic sulfurous compounds present in these materials is whether they remain bound to the solid phase or whether they are mobilized into the solution. Mobility of inorganic sulfur in natural water/solid biphasic systems is predominantly controlled by oxidative or reductive changes and precipitation constants of sulfurous compounds. In anaerobic environments, sulfur is encountered in its most reduced form, i.e. sulfidic form. Owing to the poor solubility of most sulfidic compounds, sulfurous compounds are predominantly immobile in anaerobic environments. On the contrary, in aerobic environments, the most stable inorganic sulfur compound is sulfate, which is usually very soluble in water. Reductive and oxidative changes of inorganic sulfurous compounds often involve an interaction with protons. Sulfur reduction is usually accompanied with alkalization of the environment, whereas sulfur oxidation often results in acidification. The general overview of the effects of reductive and oxidative

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