الفهرس 
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Abstract
Widespread occurrence of pharmaceuticals has started to attract attention as aquatic micropollutants that might have been affecting the ecological system in trace amounts. The risks associated with their introduction into wildlife habitats is becoming an important issue for both regulators and the pharmaceutical industry, because of incomplete elimination of pharmaceuticals wastewater and their metabolites. In this study there are different classes of pharmaceuticals.
This work aims to monitor and remove some of chemical and pharmaceutical residues in industrial wastewater such as (caffeine, paracetamol, dexamethasone and naproxen). The identification and quantification of these chemical and pharmaceutical residues was explored using GC/MS spectrometer and the analytical method was used (EPA625) determination of the concentration in industrial wastewater using liquid chromatography-based tandem mass spectrometry LC/MS/MS spectrometer with electrospray ionization (ESI) and the analytical method was used (EPA 1694 ). The study recorded occurring of different types of chemical and pharmaceutical residues with different concentration levels in the effluents of a pharmaceutical and chemical industries facility. The concentration levels in wastewater were detected for dexamethasone at 254 ng/ml, for paracetamol at 7416 ng/ml, for caffeine at 9465 ng/ml and for Naproxen at 2000 ng/ml these concentrations representing about 500 fold higher than international safety margin of treated wastewater. Magnetic activated carbon (MAC) is proposed as a new techniqe for the adsorption of pharmaceutical residues (Paracetamol, Caffeine, Dexamethasone and Naproxen) by using two origins granulated activated carbon (GAC) and Sawdust (SD) with different activation types. The isotherms as well as adsorption kinetics are explored. The study showed that there is an effect on the treatment of these chemical and pharmaceutical residues for GAC by 98.9% of removal and for SD by 92% of removal and this percentage was increased by increasing the time, and adsorbent dose, while its was decrease by increasing the concentration. The results obtained high adsorption capacity of paracetamol, caffeine, dexamethasone and naproxen over MAC derived from GAC origin which has reached 1.1 mg g-1, 1.8 mg g-1, 3.07 mg g-1 and 1.6 mg g-1 after 60 min for paracetamol and 15 min for caffeine, dexamethasone and naproxen. First order model is fitted well with the experimental results through a correlation coefficient (0.978 and 0.944) for (caffeine and dexamethasone) respectively and second order model is fitted well with the experimental results through a correlation coefficient (0.945 and 0.9887) for (Paracetamol and Naproxen) respectively. Moreover, the adsorption of paracetamol on MAC with GAC origin is proceeded using langumir isotherm model considering correlation coefficient (0.987) and the adsorption of (caffeine ,dexamethasone and naproxen) on MAC with GAC origin is proceeded using freundlish isotherm model considering correlation coefficient (0.953, 0.949 and 0.948) respectively also the results obtained high adsorption capacity of paracetamol, caffeine, dexamethasone and naproxen over MAC with SD origin which has reached 1.08 mg g-1, 1.77 mg g-1, 1.98 mg g-1 and 1.64 mg g-1 after 15 min for all the chemical residues. Second order model is fitted well with the experimental results through a correlation coefficient 0.99 for the analytes. Moreover, the adsorption of the pharmaceutical and chemical residues on MAC with derived from SD origin is proceeded using freundlish isotherm model considering correlation coefficient (0.99).