Efficient performance of magnesium oxide loaded biochar for the significant removal of Pb2+ and Cd2+ from aqueous solution

Shi, Qingliang; Zhang, Hua; Shahab, Asfandyar; Zeng, Honghu; Zeng, Huiting; Bacha, Aziz-Ur-Rahim; Nabi, Iqra; Siddique, Jamil; Ullah, Habib

doi:10.1016/j.ecoenv.2021.112426

Cited by 63 publications

(9 citation statements)

References 49 publications

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“…Solution pH can affect the states of adsorbents and ions simultaneously, so it is an important factor in removal of heavy metals from wastewater [ 35 ]. Distribution of Cd 2+ substances under different pH values was simulated with Visual MINTEQ 3.1 and is shown in Figure 5 a.…”

Section: Resultsmentioning

confidence: 99%

“…It was clear that Cd 2+ removal using tobermorite was well described with the Langmuir model (R 2 = 0.8983), which suggested that Cd 2+ removal was a process of monolayer chemical adsorption that probably occurred through surface complexation with tobermorite [ 2 , 39 ]. Different studies also showed that Cd 2+ removal with a range of other adsorbents was fitted better with the Langmuir model than with the Freundlich model [ 35 , 40 , 41 ]. In addition, Q m , as the maximum adsorption capacity calculated from the Langmuir model, could be used as the theoretical saturated adsorption capacity.…”

Section: Resultsmentioning

confidence: 99%

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Highly Efficient Cd2+ Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution

et al. 2023

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Cadmium (Cd), as a type of heavy metal, can increase the incidence of many diseases, even in low concentrations. In this study, tobermorite was hydrothermally synthesized and then applied to adsorb Cd2+ from an aqueous solution. The physicochemical characteristics of the synthesized tobermorite were detected, and the results indicated that the well-crystallized tobermorite had a lot of mesopores and a large specific surface area of 140.92 m2/g. It acquired a pH self-adjustment ability via spontaneously releasing Ca2+ and OH- into the aqueous solution. The effects of different factors on Cd2+ removal were investigated. For Cd2+, the removal efficiency could reach 99.71% and the maximum adsorption capacity was 39.18 mg/g using tobermorite. The adsorption data was best fitted with the pseudo-second-order kinetic and Langmuir isotherm models. In addition, there was no strict limit on the solution pH in Cd2+ adsorption because the tobermorite could adjust the solution pH to an alkaline atmosphere spontaneously. The efficient removal of Cd2+ using tobermorite was a result of surface complexation and ion exchange.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Highly Efficient Cd2+ Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution

et al. 2023

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“…The initial concentration of contaminants is an important driving force for mass transfer between solid and liquid phases during adsorption [ 38 ]. To explore the effect of initial CIP concentration on removal by the ceramsite, solutions with different initial CIP concentrations were investigated, and the removal efficiency and adsorption capacity are exhibited in Figure 5 a.…”

Section: Resultsmentioning

confidence: 99%

Waste-Based Ceramsite for the Efficient Removal of Ciprofloxacin in Aqueous Solutions

Qin

Fang

Shi

et al. 2023

IJERPH

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Ciprofloxacin (CIP), a compound with bioaccumulation toxicity and antibiotic resistance, is frequently detected in water at alarming concentrations, which is becoming an increasing concern. In this study, a low-cost ceramsite was developed from industrial solid wastes through sintering to remove CIP from wastewater. The effects of adsorbent dosage, initial pH, contact time, initial CIP concentration, and temperature were explored. More than 99% of CIP (20–60 mg/L) was removed at around pH 2–4 by the ceramsite. The kinetic data fitted well with the pseudo-second-order model, revealing that chemisorption was the main rate-determining step. The isotherm data was better described by the Freundlich model, suggesting that CIP was removed by the formation of multiple layers on the heterogeneous surface. Moreover, the removal efficiency was practically higher than 95% during five regeneration cycles, when different regeneration methods were used, including calcination, HCl, and NaOH washing, indicating that the ceramsite exhibited outstanding reusability in removing CIP. The primary mechanism of CIP removal by the ceramsite was found to be the synergism of adsorption and flocculation, both of which depended on the release of Ca2+ from the ceramsite. In addition, strong Ca-CIP complexes could be formed through surface complexation and metal cation bridging between Ca2+ and different functional groups in CIP.

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“…Mg adsorption onto the biochar surface contributed to these peak intensity changes and peak shifts. After the nutrient sorption test, the intensity-increase of oxygen-containing functional groups and C=C aromatic groups of Mg-SB and I-Mg-SB showed that these functional groups were involved in nutrient adsorption [30]. In contrast, MgCl2-SB showed insignificant changes in intensity even after the adsorption test.…”

Section: Xps Analysismentioning

confidence: 91%

Fabrication of Mg-Doped Sargassum Biochar for Phosphate and Ammonium Recovery

et al. 2021

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Biochars prepared from macro-algae have a lower C/N ratio compared to lignocellulosic biochar, which is advantageous for direct nutrition. In particular, Sargassum, a marine macro-algae, has a high Mg content; hence, it can be expected to adsorb P and N simultaneously. In this study, Sargassum horneri biochar (SB), pyrolyzed at 400, 500, and 600 °C, was doped with innate Mg through water leaching, and nutrient recovery from the wastewater-mimicking solution was confirmed. The biochar pyrolyzed at 600 °C showed maximum Mg adsorption during water leaching, and the efficiency of K and Na removal was also high, at 92.7% and 91.9%, respectively. The addition of MgCl2 during pyrolysis and high ion exchange did not show distinct advantages for surface modification and nutrient adsorption. X-ray photoelectron spectroscopy analysis confirmed the participation of biochar in the surface adsorption of Mg and PO4 recovery. The PO4 sorption capacity of biochar reached >120 mg·g−1, while the sorption capacity for NH4 was low, at 22.8–28.2 mg·g−1, suggesting that Mg-surface-doped SB presented excellent phosphorus recovery. Hence, upgrading an adsorbent as a wastewater-treatment material and soil ameliorant that recovers nutrients using innate Mg from Sargassum is possible through appropriate surface modification.

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Efficient performance of magnesium oxide loaded biochar for the significant removal of Pb2+ and Cd2+ from aqueous solution

Cited by 63 publications

References 49 publications

Highly Efficient Cd2+ Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution

Highly Efficient Cd2+ Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution

Waste-Based Ceramsite for the Efficient Removal of Ciprofloxacin in Aqueous Solutions

Fabrication of Mg-Doped Sargassum Biochar for Phosphate and Ammonium Recovery

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