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The effect of compositing multiwalled carbon nanotubes (MWCNTs) with polystyrene (PS) to fabricate nanofibrous membrane by electrospinning technique and comparing the direct contact membrane distillation (DCMD) performance of the blank and composite membranes is evaluated numerically. Surface morphology of both the pristine and the composite membrane was studied by SEM imaging while the average fiber diameter and average pore size were measured using ImageJ software. Static water contact angle and porosities were also determined for both membranes. Results showed significant enhancement in both the hydrophobicity and porosity of the composite membrane by increasing the static water contact angle from 145.4° for the pristine PS membrane to 155° for the PS/MWCNTs composite membrane while the porosity was increased by 28%. Simulation results showed that at any given feed inlet temperature, the PS/MWCNTs membrane have higher permeate flux and better overall system performance.

This study investigated the applicability of magnetite Fe(3)O(4) nanoparticles coated with chitosan (CMNs) for the removal of some toxic heavy metals from simulated wastewater. Magnetic nanomaterials were synthesized using the co-precipitation method and characterized by transmission electron microscope, scanning electron microscope, X-ray diffraction, and Fourier transformer infrared spectroscopy. The magnetic properties of the prepared magnetic nanoparticles were determined by a vibrating-sample magnetometer. Batch experiments were carried out to determine the adsorption kinetics of Cr(VI) and Cd(II) by magnetic nanoparticles. It is noteworthy that CMNs show a highly efficient adsorption capacity for low concentration Cr(VI) and Cd(II) ions solution, which can reach 98% within 10 min.

Herein, for the first time, we investigate the adsorption performance of nanoZn benzenedicarboxylate metal-organic framework (nanoMOF-5) as an efficient adsorbent material for Cr (VI) decontamination from polluted water. The synthesized Zn MOF-5 was fully characterized via FT-IR, XRD, HRTEM, BET, and TGA techniques. Moreover, the prepared Zn MOF-5 revealed a prominent surface area of 1169.32 m2 g-1, demonstrating its ability to be utilized as a capable adsorbent material. The adsorption profile of Cr (VI) onto the fabricated Zn MOF-5 was performed against the various parameters such as contact time, dosage, and initial Cr (VI) concentration. The optimum dosage from the Zn MOF-5 for 81.03% adsorption of 25 ppm Cr (VI) was 0.5 g L-1 at pH=7 after 15 min. The Cr (VI) decontamination performance of the synthesized Zn MOF-5 recorded the maximum monolayer adsorption capacity of 91.22 mg/g. These data demonstrated that the synthesized nanoZn MOF-5 is a promising adsorbent material for the removal of Cr (VI) from wastewater. Keywords: Zinc Metal-Organic Framework (MOF-5), Cr (VI) Decontamination, Isotherm and Kinetics, Recyclability.