Gh. Eshaq

Bio: Gh. Eshaq is an academic researcher from Egyptian Petroleum Research Institute. The author has contributed to research in topics: Adsorption & Aqueous solution. The author has an hindex of 17, co-authored 30 publications receiving 929 citations.

Degradation of nitrobenzene at near neutral pH using Fe2+–glutamate complex as a homogeneous Fenton catalyst

Abstract: We examined the degradation of nitrobenzene (NB) by modified Fenton reaction at near neutral pH conditions using Fe II –glutamate complex as a source of Fe 2+ . The reaction was conducted using 0.04 mM (5 mg L −1 ) of NB in presence of 65 mM H 2 O 2 at room temperature. Complex concentrations of 5, 10, 15 and 20 mM (Fe 2+ = 0.81, 1.62, 2.43 and 3.23 mM) were assayed and showed effective rates of NB degradation with t 1/2 values of 17, 6.2, 4.8 and 1.85 min, respectively. In the pH range 5–7 the complex activity is pH-dependent, and the optimal pH was 6.3. The degradation was monitored by solid-phase microextraction in combination with GC analysis. The rate of degradation recorded at near neutral pH in presence of 20 mM of Fe-complex was equal to that obtained in presence of Fe 2+ (2.5 mM) at pH 2.7. Glutamate complexes formed with Cu 2+ or Co 2+ did not show the improved degradation observed in case of Fe–glutamate. Furthermore, the introduction of the chelating agent as a free ion into the reaction medium containing Fe 2+ did not improve the degradation of NB at neutral pH conditions.

A review on Fenton-like processes for organic wastewater treatment

Abstract: Fenton-like processes have been studied widely in recent years and are considered promising for organic wastewater treatment. Due to the demand for high efficiency wastewater treatment, a summary of the study status of Fenton-like processes is necessary to develop a novel and high efficiency organic wastewater treatment method. In this review, some important effect parameters (pH, H2O2 dosage, catalyst dosage, temperature) in hetero-/homo-geneous Fenton-like processes are discussed, and then the physical field/phenomenon-assisted hetero-/homo-geneous Fenton-like processes are presented. After that, catalyst types and the evaluation of wastewater treatment costs for various Fenton-like processes are summarized and discussed. Finally, possible future research directions and some guidelines for Fenton-like processes are given.

Beyond Mechanical Recycling: Giving New Life to Plastic Waste

Abstract: Increasing the stream of recycled plastic necessitates an approach beyond the traditional recycling via melting and re-extrusion. Various chemical recycling processes have great potential to enhance recycling rates. In this Review, a summary of the various chemical recycling routes and assessment via life-cycle analysis is complemented by an extensive list of processes developed by companies active in chemical recycling. We show that each of the currently available processes is applicable for specific plastic waste streams. Thus, only a combination of different technologies can address the plastic waste problem. Research should focus on more realistic, more contaminated and mixed waste streams, while collection and sorting infrastructure will need to be improved, that is, by stricter regulation. This Review aims to inspire both science and innovation for the production of higher value and quality products from plastic recycling suitable for reuse or valorization to create the necessary economic and environmental push for a circular economy.