The volatile organic compounds (VOCs) have toxic effect on human health and environmental matrixes. So, determination and removal VOCs from the environmental samples such as water, wastewater and air are very important as toxicology effect on humans. Many chemistry techniques such as; analytical methods for sorbents (extraction, adsorption), sole gel method, pervaporation, regenerative catalytic oxidation (RCO), recuperative catalytic oxidation (CO), adsorptive concentration-catalytic oxidation, photocatalytic oxidation (PCO), ozonation-catalytic oxidation and non-thermal plasma-catalytic oxidation, were used for removal and decreasing of VOCs from different matrix. This review study introduces the adsorbents and applied chemistry methods which were recently used in different works for removal of VOCs in air or water samples by scientists.

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In this study, the phenyl sulfonic acid (PhSA) modified carbon nanotubes (CNTs) were used for benzene removal from waters by  (D- μSPE). Due to adsorption mechanism, π–π interactions was provided between the aromatic ring of benzene with the surface (SO3H) and phenyl ring (-C6H5) of CNTs, respectively. Therefore, 20-100 mg of sorbent, concentration of benzene (0.1–10 mg L-1), pH (1-12) and contact time (5–120 min) were investigated and optimized for benzene removal from water samples in static system. The concentration of benzene in water was determined by (SHS-GC-MS). The results showed, the Langmuir-Freundlich (LF) isotherm provided the best fit for benzene sorption. By using the Langmuir model, the maximum adsorption capacity of 117.34 and 22.86 mg/g was achieved for benzene removal from waters with CNTs@PhSA and CNTs, respectively. Under optimal conditions, adsorption efficiency of CNTs@PhSA and CNTs was obtained 97.7% and 20.6 % for benzene removal from water samples, respectively.

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