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The purpose of this paper is to synthesize Cr-ZSM-5 using hydrothermal synthesis in acidic fluoride medium and the investigation of its catalytic performance in heterogeneous oxidation of 2-mercaptobenzothiazole in the presence of H₂O₂.

The framework was characterized by chemical composition, FT-IR, UV-visible spectroscopy, N₂ adsorption (BET), and diffraction x-ray (DRX). FT-IR spectroscopy shows the characteristic band of Si-O-Cr linkage around 960-990 cm⁻¹ and bands around 688-690 and 627 cm⁻¹, indicating the presence of extraframework chromium oxide. UV spectra show a shoulder around 244-257 and bands around 360-380 nm, assigning the tetrahedral coordinated environment in (O²⁻=Cr⁶⁺) − (Cr⁵⁺-O⁻¹), charge transfer transition state (CT) of isolated Cr (VI) inside the structure of Cr-ZSM-5.

The catalytic degradation of 2-mercaptobenzothiazole by H₂O₂ heterogenous oxidation using catalyst Cr-ZSM-5 showed the formation of bis (benzothiazoyl) disulfide with 95 percent yield.

The application of this process in the environment (catalysis, adsorption, and degradation of organic compounds).

The purpose of this paper is to examine the batch adsorption system of a cationic dye (methylene blue, widely used in various sectors) on two adsorbents; ZSM-5 zeolite which was prepared with the molar composition: 0.2057 Na₂O-0.00266 Al₂O₃-SiO₂-0.68 (pyrrolidine)-40 H₂O-0.12 H₂SO₄.

By the hydrothermal synthesis method, and the purified clay and is analyzed by IR and DRX method.

For this, the authors conducted a parametric study of adsorption and effect of several important parameters on the adsorption of BM on the material used, in particular, the contact time (equilibrium is established after 120 min), different concentrations of adsorbents, different masses, the pH and temperature. The experiments demonstrated the crucial role of these parameters. A kinetic study was done and kinetic models were applied to the experimental results such as the pseudo-first order, pseudo-second order.

This work is original.