Modified bentonite adsorption of organic pollutants of dye wastewater

The present review covers the regeneration capacity and adsorption efficiency of different adsorbents for the treatment of industrial dyes to control water pollution. Various techniques and materials have been employed to remove organic pollutants from water; however, adsorption techniques using cost-effective, ecofriendly, clay-supported adsorbents are widely used owing to their simplicity and good efficiency. Among all the natural adsorbents, activated carbon has been found to be the most effective for dye adsorption; however, its use is restricted due to its high regeneration cost. Clays and modified clay-based adsorbents are the most efficient clarifying agents for organic pollutants as compared to activated carbon, organic/inorganic, and composite materials. Regeneration is an important aspect to stimulate the adsorption efficiency of the exhausted/spent adsorbent for water treatment. A number of techniques, including chemical treatment, supercritical extraction, thermal, and photocatalytic and biological degradation, have been developed to regenerate spent or dye-adsorbed clays. This review discusses how these techniques enhance the adsorption and retention potential of spent low-cost adsorbents and reflects on the future perspectives for their use in wastewater treatment.

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Regeneration performance of clay-based adsorbents for the removal of industrial dyes: a review

The adsorption studies of crystal violet (CV) dye from aqueous solution using magnetic nanoparticles (MNPs) modified with sodium dodecyl sulphate (SDS) was investigated. The synthesized MNPs were characterized by TEM, EDAX and XRD. In batch optimization studies, the maximum removal efficiency of 80.4% was obtained at the optimum levels of pH 6, contact time 10 min, adsorbent dosage 0.25 g/L and initial dye concentration 10 ppm. The adsorption data was best fitted with Freundlich isotherm ( R 2 = 0.957) and maximum adsorption capacity of 166.67 mg/g was determined from Langmuir isotherm. The adsorption of CV by SDS coated MNPs follows the pseudo-second order kinetic model. The results of this study showed that the SDS coated MNPs were found to be cost effective and easily separable nanoadsorbent for efficient removal of crystal violet dye.

Adsorption isotherms and kinetic studies of crystal violet dye removal from aqueous solution using surfactant modified magnetic nanoadsorbent

Novel adsorbent from agricultural waste (cashew NUT shell) for methylene blue dye removal: Optimization by response surface methodology

Removal of basic dye (methylene blue) from aqueous solution using zeolite synthesized from electrolytic manganese residue

A novel conversion process for waste residue: Synthesis of zeolite from electrolytic manganese residue and its application to the removal of heavy metals

We analyzed the leaching behavior and chemical speciation of heavy metals in a landfill of electrolytic manganese residue (EMR). The results showed that most of Pb, Cr, As, Cu, and Zn were associated with F4 (residual fraction) and Mn and Co were mainly present in F1 (exchangeable and weak acid soluble fraction). In order to evaluate potential risks of heavy metals to the landfill, modified potential ecological risk index (MPER), potential ecological risk index (PER), index of geo-accumulation (Igeo) assessment, and risk assessment code (RAC) were employed. Ranking order for potential risk based on RAC assessment is Mn > Co > Zn > Cu > Cr = As = Pb. Results from Igeo assessment indicates that Mn poses a potential for high risk to human health and the ecosystem. MPER, which integrates the characteristics of PER and RAC, shows that the potential risks of heavy metals are in the order of As > Cu > Mn > Co > Pb > Cr > Zn. The analysis indicates that Mn, Co, As, and Cu within EMR pose a potential risk ...

Leaching Behavior and Risk Assessment of Heavy Metals in a Landfill of Electrolytic Manganese Residue in Western Hunan, China

Kinetics of reduction leaching of manganese dioxide ore with Phytolacca americana in sulfuric acid solution

CRISPR-Cas12a-mediated luminescence resonance energy transfer aptasensing platform for deoxynivalenol using gold nanoparticle-decorated Ti3C2Tx MXene as the enhanced quencher.

Changxin Li

Papers

Removal of basic dye (methylene blue) from aqueous solution using zeolite synthesized from electrolytic manganese residue

A novel conversion process for waste residue: Synthesis of zeolite from electrolytic manganese residue and its application to the removal of heavy metals

Leaching Behavior and Risk Assessment of Heavy Metals in a Landfill of Electrolytic Manganese Residue in Western Hunan, China

Kinetics of reduction leaching of manganese dioxide ore with Phytolacca americana in sulfuric acid solution

CRISPR-Cas12a-mediated luminescence resonance energy transfer aptasensing platform for deoxynivalenol using gold nanoparticle-decorated Ti3C2Tx MXene as the enhanced quencher.