Phosphorylated cellulose paper as highly efficient adsorbent for cadmium heavy metal ion removal in aqueous solutions

In search for more effective and eco-friendly adsorbent materials, this study comprehensively investigated Cd2+ adsorption onto phosphorylated cellulose paper (PCP).

Effect of Gamma Radiation on the Adsorption Capacity and Regeneration / Desorption of Sulphate and Phosphate Ions Using Smart Hydrogel.

Co-polymeric hydrogels containing poly (Acrylamide /Epichlorohydrine) P(AAm/EPI) with different acrylamide and Epichlorohydrine content were fabricated by gamma radiation at different irradiation doses as adsorbent materials for wastewater treatment. The mechanisms of radiation-induced crosslinking of hydrogel in aqueous solution has been evaluated. The gel contents and the swelling/diffusion kinetic parameters were evaluated at different irradiation doses, and the result confirm a non-fichian mechanism. The shape, surface morphology, and porosity of P (AAm/ Epi) hydrogel were characterized by scanning electron microscope (SEM). Adsorption experiments were carried out for the removal of sulphate and phosphate ions from wastewater using P(AAm/EPI) hydrogels as adsorbent materials. The isotherm data were analyzed by Freundlich equation. The equilibrium isotherm results show a better fitting (R2 > 0.9) to the Freundlich model for all anions. The calculated regeneration efficiency (%) values of sulphate and phosphate ions found to be ranged between 63.2 (%) and 46 (%).The relatively higher regeneration efficiency (%) and keeping the hydrogels its shape without any deformation promising to use the same hydrogels further times which decrease the economic cost.

Recent Progress in the Application of Hydroxyapatite for the Adsorption of Heavy Metals from Water Matrices

Wastewater treatment remains a critical issue globally, despite various technological advancements and breakthroughs. The study of different materials and technologies gained new valences in the last years, in order to obtain cheap and efficient processes, to obtain a cleaner environment for future generations. In this context, the present review paper presents the new achievements in the materials domain with highlights on apatitic materials used for decontamination of water loaded with heavy metals. The main goal of this review is to present the adsorptive removal of heavy metals using hydroxyapatite-based adsorbents, offering a general overview regarding the recent progress in this particular area. Developing the current review, an attempt has been made to give appropriate recognition to the most recent data regarding the synthesis methods and targeted pollutants, including important information regarding the synthesis methods and precursors, morphological characteristics of the adsorbent materials and effectiveness of processes.

Controllable synthesis and adsorption mechanism of flower-like MoS2/g-C3N4 nanocomposites for removal of methylene blue in water

The fabrication and adsorption mechanism of flower-like MoS2/g-C3N4 nanocomposites as new adsorbent materials were investigated by batch sorption experiments in this paper. The influence of factors such as pH, adsorbent dosage, concentration and temperature on the adsorption properties of flower-like MoS2/g-C3N4 nanocomposites were studied in detailed. The adsorption isotherm data was fitted with the Langmuir model, and the adsorption kinetic characteristics conform to the quasi second-order kinetic equation. Thermodynamic data showed that the adsorption process of methylene blue (MB) was feasible, endothermic and spontaneous. At 45 ℃, the maximum adsorption capacity was 278.4 mg/g. The adsorbed MB solution was used to water the wheat and chickpea plants within 15 days. Compared with MB solution, the treated MB solution made the plants grow much more better.