Adsorption performance and mechanism investigation of Mn2+ by facile synthesized ceramsites from lime mud and coal fly ash

Ou, Changjin; Dai, Suwan; Li, Shuxuan; Xu, Jie; Qin, Juan

doi:10.1007/s11814-020-0706-z

Cited by 12 publications

(7 citation statements)

References 51 publications

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“…At the same time, the solution pH increased persistently, indicating that the tobermorite could release OH − independently to regulate the pH. The pseudofirst-order (PFO) and pseudosecond-order (PSO) kinetic models, as described in Equations (4) and (5), were used to fit the kinetic data [ 37 ]. The linear plots and obtained parameters are presented in Figure 6 and Table 1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…It can be inferred that the release of OH - from tobermorite might be inhibited in solutions with high Cd 2+ concentrations. Isotherm data obtained in this study were analyzed using the Langmuir and Freundlich isotherm models, which are described in Equations (6) and (7), respectively [ 37 ]: C e /Q e = 1/(Q m K L ) + C e /Q m lnQ e = lnK F + nlnC e where C e (mg/L) is the equilibrium concentration; Q e (mg/g) and Q m (mg/g) are the equilibrium and maximum adsorption capacities; K L (L/mg) and K F ((mg/g)/(mg/L) 1/n ) are the adsorption constants of the Langmuir and Freundlich models, respectively; and n is the empirical constant related to adsorption strength.…”

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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“…To investigate the CIP removal mechanism in detail, the kinetic data of CIP removal by the ceramsite at 25 °C was fitted using the pseudo-first-order and pseudo-second-order kinetic models [ 22 ]. The mathematical equations of the two models are presented in Equations (3) and (4): ln(Q e − Q t ) = lnQ e − k 1 t t/Q t = 1/(k 2 Q e 2 ) + t/Q e where t (h) is the contact time, Q e (mg/g) is the adsorption capacity at equilibrium, k 1 (1/h) is the rate constant of the pseudo-first-order model, and k 2 [g/(mg·h)] is the rate constant of the pseudo-second-order model.…”

Section: Methodsmentioning

confidence: 99%

“…Numerous techniques, such as biodegradation [ 16 ], photodegradation [ 4 , 10 , 11 ], advanced oxidation [ 17 , 18 ], adsorption [ 3 , 19 ], membrane separation [ 20 ], and flocculation [ 19 , 21 ], have been adopted to remove CIP. Among these, adsorption has attracted growing attention due to its flexibility, high efficiency, and low operational cost [ 22 ]. The effectiveness of adsorbents and adsorption conditions are key for removal efficiency and adsorption mechanism.…”

Section: Introductionmentioning

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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“…Moreover, the raw material weight ratio and sintering conditions, including sintering temperature, sintering time, preheating temperature, and preheating time were investigated. Ou, C. et al [ 11 ] used two kinds of ceramsites with pH self-adjustment ability synthesized from lime mud and coal fly ash to efficiently control manganese pollution. The influence of different parameters like contact time, concentration of Mn 2+ , and pH on adsorption performance was examined.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Lightweight Ceramsite from Solid Waste Using SiC as a Foaming Agent

Shang

Fan

et al. 2022

Materials

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SiC was chosen as the foaming agent, and river bottom silt, waste oil sludge, paint bucket slag, and fly ash were used as raw materials, to prepare lightweight ceramsite without adding any chemical additives. The effects of SiC dosing and sintering temperature on various properties of the ceramsite were studied, and the pore-forming mechanism of the lightweight ceramsite was clarified by thermal analysis and X-ray diffraction analysis. The results showed that the single ceramsite compressive strength, water absorption, bulk density, and porosity of ceramsite sintered at 1180 °C with 1.0% SiC were 2.15 MPa, 2.02%, 490 kg/m3, and 23.85%, respectively. The major mineralogical compositions were quartz, fayalite, and kyanite, with small amounts of albite-low from 1140 to 1190 °C. Furthermore, the concentration of all tested heavy metals from ceramsite was lower than the maximum allowable concentration of the leaching solution specified in the Chinese national standard (GB 5085.3-2007), which reveals that this solid waste ceramsite will not cause secondary environmental pollution. The prepared ceramsite, exhibiting lower bulk density, high water absorption and porosity, and effective solidification of deleterious elements, can be used to prepare green lightweight aggregate concrete. Importantly, preparation of solid waste ceramsite is an effective way to dispose of hazardous wastes.

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Adsorption performance and mechanism investigation of Mn2+ by facile synthesized ceramsites from lime mud and coal fly ash

Cited by 12 publications

References 51 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

Preparation of Lightweight Ceramsite from Solid Waste Using SiC as a Foaming Agent

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