Cr(VI) Removal from Aqueous Solution Using a Magnetite Snail Shell

Hoang, Le Phuong; Nguyen, Thi Minh Phuong; Van, Huu Tap; Hoang, Thi Kim Dung; Vu, Xuan Hoa; Nguyễn, Tiến Vinh; Ca, Nguyễn Xuân

doi:10.1007/s11270-020-4406-4

Cited by 29 publications

(14 citation statements)

References 40 publications

(64 reference statements)

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“…Snail shells are typically modified after being pre-treated through washing and drying processes to increase surface and adsorption area. Some unmodified pretreated materials have an adsorption surface of less than 2 m 2 /g and 0.001 cm 3 /g with BET and total pore volume [ 99 ]. The average surface area of the unmodified shell material is significantly lower than that of the modified biochar, as shown in Table 2 .…”

Section: Property Structure and Process Of Snail Shell As Bio-adsorbentmentioning

confidence: 99%

A Critical Review of Snail Shell Material Modification for Applications in Wastewater Treatment

2023

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Sea material is becoming increasingly popular and widely used as an adsorbent in wastewater treatment. Snail shell, a low-cost and natural animal waste material, has been shown to have a high calcium content (>99%) and a large potential surface area for the development of sustainable adsorbents. This paper presents a novel synthesis of methods for using snail shell absorbent materials in the treatment of wastewater containing heavy metals, textile dyes, and other organic substances. Modified biochar made from snail shells has gained popularity in recent years due to its numerous benefits. This paper discusses and analyzes modification methods, including impregnating with supplements, combining other adsorbents, synthesis of hydroxyapatite, co-precipitation, and the sol–gel method. The analysis of factors influencing adsorption efficiency revealed that pH, contact time, temperature, initial concentration, and adsorbent dose all have a significant impact on the adsorption process. Future research directions are also discussed in this paper as a result of presenting challenges for current snail adsorbents.

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Section: Property Structure and Process Of Snail Shell As Bio-adsorbentmentioning

confidence: 99%

A Critical Review of Snail Shell Material Modification for Applications in Wastewater Treatment

2023

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“…Chromium contamination is arised from several industries, such as leather tainning, stainless steels, pigments, textiles (Xu et al 2011;Hoang et al 2020), and so on. Trivalent form and hexavalent form of chromium are the usual valence states, of which hexvalent chromium is more toxic than trivalenet chromium and is the main cause of pollution.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient scavenging of Cr(VI) by two-dimensional titanium carbide nanosheets: kinetics, isotherms and thermodynamics analysis

Chang

et al. 2021

Water Science and Technology

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In this study, two-dimensional (2D) MXene material (Ti3C2Tx) was employed to investigate its potentials toward the Cr(VI) removal in aqueous system by batch experiments. Characterization techniques such as SEM-EDS, HRTEM, XRD, FI-TR and XPS were used to analyze the structure and interaction of Ti3C2Tx before and after Cr(VI) adsorption. The results indicated that layered structure of Ti3C2Tx had unique surface functional properties and abundant active sites, such as –OH, Ti–O, C = O, which exhibited high adsorption capacity for the Cr(VI) removal. The Cr(VI) adsorption capacity by Ti3C2Tx decreased with the increase of pH, and its maximum value can reach 169.8 mg/g at pH = 2.0. The adsorption kinetic was well-explained by a pseudo-second-order kinetic, indicating that chemical interaction played a dominant role in the adsorption of Cr(VI) on Ti3C2Tx. Meanwhile, the isotherm data was calculated to conform the Freundlich isotherm model. Thermodynamic analysis indicated that the adsorption process of Cr(VI) on Ti3C2Tx was a spontaneous endothermic process. These experimental results revealed that Ti3C2Tx had tremendous potential in heavy metals adsorption from aqueous solutions.

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“…These shortcomings have made researchers seek alternative techniques for heavy metal remediation. Adsorption using naturally available materials has been reported to be efficient in the removal of hazardous metals from industrial effluents (Eletta, Mustapha, Ajayi, & Ahmed, 2018; Hoan et al, 2020; Ullah et al., 2020). The materials employed in this technique often range from the use of microbes and naturally abundant plant materials to dead waste biomass (Gavrilescu, 2004; Malik et al., 2006).…”

Section: Introductionmentioning

confidence: 99%

Biosorption of chromium (VI) from textile waste water using luffa cylindrica activated carbon

Nwosu‐Obieogu

Okolo

2020

Environmental Quality Mgmt

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Luffa cylindrica was applied as a low-cost adsorbent for removing chromium (VI) from textile industry effluent in this study. The adsorbent was characterized using scanning electron micrograph (SEM). A batch mode experiment was conducted to study the effect of pH, contact time, and adsorbent dosage on the adsorptive potential of the prepared luffa cylindrica activated carbon. The characterization results from SEM indicate that the adsorbents' potential was fully exploited in this study. A significance test conducted using ANOVA indicated that contact time and adsorbent dosage had the most effect on the adsorptive removal of Cr (VI). The optimum removal efficiency was 99.90% at pH 8.0, 99.8% at 60 min of contact time, and 99.82% at an adsorbent dosage of 1.0 g. The experimental results were analyzed using the Langmuir and Freundlich adsorption isotherm models, and the Freundlich isotherm provided a better correlation for Cr (VI) adsorption. The kinetic data by the pseudo-first-order kinetic model gave a better fit than the pseudo-second-order kinetic model.

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Cr(VI) Removal from Aqueous Solution Using a Magnetite Snail Shell

Cited by 29 publications

References 40 publications

A Critical Review of Snail Shell Material Modification for Applications in Wastewater Treatment

A Critical Review of Snail Shell Material Modification for Applications in Wastewater Treatment

Highly efficient scavenging of Cr(VI) by two-dimensional titanium carbide nanosheets: kinetics, isotherms and thermodynamics analysis

Biosorption of chromium (VI) from textile waste water using luffa cylindrica activated carbon

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