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In this work, superparamagnetic Fe3O4/C core/shell nanoparticles (NPs) were synthesized using a room‐temperature and green route combining co‐precipitation method, followed by hydrothermal process. The prepared nanoparticle was utilized as an adsorbent for the removal of Pb+2 ions from a wastewater. The effect of various parameters; such as pH, dose of adsorbent, contact time and concentration of lead ions on the adsorption capacity were examined in details. The adsorption capacity (qm) of Fe3O4/C NPs was estimated from the Langmuir isotherm curve and was found to be 244 mgg−1. Interestingly, the produced Fe3O4/C NPs exhibited a rapid removal of toxic lead metal ions from wastewater effluents and the adsorption kinetics is well described by pseudo‐second‐order model. Furthermore, the data of Pb2+ adsorption is best fit for the Langmuir model. Moreover, the Fe3O4/C core/shell NPs were recycled and reused for at least five times without a significant loss of adsorption efficiency.

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Heavy metal contamination is a severe problem with serious ecological and human health effects due to its toxic effect and tendency to accumulate throughout the food chain. Batch experiments were conducted to investigate the simultaneous removal of arsenic, iron and manganese ions from aqueous solutions using Nanocarbon hybrid (NCH). Nanocarbon hybrid (NCH) of carbon xerogel decorated with 1wt% multi-walled carbon nanotubes was prepared by carbonization at 850 C for 2 h. The TEM, SEM, EDX, FTIR, and N 2 adsorption-desorption measurements were used to characterize the prepared NCH. NCH is enriched with surface oxygen functional groups and micropores as well as it have total surface area of 162 m 2 /g and total pore volume of 0.129 cm 3 /g. The adsorption of metal ions onto NCH, which confirmed by EDX, happened quickly, with 30%, 97%, and 41% of As, Fe, and Mn adsorbed in less than 10 min, however the equilibrium time was achieved in less than 30 min. The maximum adsorption capacities for As, Fe, and Mn ions onto NCH were 20, 48, and 21 mg/g, respectively. The experimental adsorption results of the three metal ions showed linearly fitting with Freundlich isotherms. In addition, the computed adsorption energies for Fe, Mn, and As ions were 4.08, 1.95, and 2.42 kJ/mol, indicating physical adsorption. NCH are easily regenerated and reusable sorbent owing to the adsorption-desorption studies. Conclusively, NCH is promising material for removing mixture of metal ions from aqueous media.

S ustainable development with environmental protection is one of the greatest challenges of the 21st century. There is a growing consideration of the sustainable development and environmental management in new industrial cities. Investigational aspects were carried out in El Obour city as Egyptian new industrial city for estimating the current wastewater problems as well as applying mitigation actions. Industrial inventory was constructed for selected industrial sectors as food, chemical and textile sectors including water consumption, materials and energy resources. Wastewater samples from different factories and lifting stations were analyzed for estimating the industrial effluent loads. The obtained data revealed that food sector represents the highest load for BOD and TSS with values of 80 ton BOD/day and 2.33 ton SS/day. For selected industrial sectors, cost-effective technology is applied to reduce the loads on the centralized wastewater treatment plant (WWTP) as well as on the lifting stations. Inorganic polymeric ferric chloride (POFC) coagulant gives higher removal efficiency for TSS and COD without pH control. Moreover, the chemicals cost for treating wastewater is reduced by 40 % with using POFC instead of conventional coagulants.