A carboxyl enriched microporous organic network（MON-2COOH） with large surface area （720.2 m,2,·g,-1,），good solvent and thermal stability（280 ℃） was synthesized with carboxyl-contained monomers for rapid adsorption and efficient removal of benzotriazoles in water．The synthesized MON-2COOH was characterized by solid-state ,13,C nuclear magnetic spectroscopy，N,2, adsorption - desorption，Fourier transform infrared spectroscopy，thermogravimetric analysis，scanning electronic microscopy and water contact angle analysis.The adsorption isotherms，kinetics and thermodynamics，effects of ionic strength，pH and humic acid of MON-2COOH for 1H-benzotriazole （BTri） and 5-tolyltriazole （5-TTri） were also investigatied in detail.The adsorption equilibriums of BTri and 5-TTri （100 mg·L,-1,） were realized within 10 min on MON-2COOH，showing the extremely fast adsorption kinetics of MON-2COOH for benzotriazoles．The pseudo-second-order kinetics plots showed good linearity for all three initial concentrations of BTri and 5-TTri，and the adsorption capacity values calculated from the pseudo-second-order model were all close to the experimental ones，both suggesting the well-fitting of pseudo-second-order kinetic model for BTri and 5-TTri on MON-2COOH．The good linearity of the Langmuir adsorption plots revealed the good plotting of Langmuir adsorption model and the monolayer adsorption process for BTri and 5-TTri on MON-2COOH．The MON-2COOH gave the large maximum adsorption capacities of 251.3 and 369.0 mg·g,-1, for BTri and 5-TTri，respectively，which were larger than many reported adsorbents.The MON-2COOH gave relatively stable adsorption capacity for BTri and 5-TTri in the pH range of 2.0 - 7.0，but decreased adsorption capacity of BTri and 5-TTri from 8.0 to 11.0，which suggested the alkaline condition was unfavorable for the adsorption of BTri and 5-TTri on MON-2COOH.Moreover，the adsorption capacity of BTri and 5-TTri was independent under NaCl concentration lower than 100 mg·g,-1, and humic acid concentration less than 40 mg·g,-1,．The MON-2COOH also owned good reusability and reproducibility．In addition，MON-2COOH was successfully applied to the adsorption and removal of BTri and 5-TTri in real lake and river water samples．The mechanisms studies revealed the important roles of π - π，hydrophobic and hydrogen bonding interaction during the adsorption．This work provided a promising way to design and synthesize efficient adsorbents for benzotriazoles，which may also promote the application of functionalized MONs in environmental contaminants analysis and elimination．