The Surface Modification Of Activated Carbon And The Removal Of Trichlorophenol Research Form Water

Today, polluted industrial wastewater containing chlorophenisic acid is an important source of water pollution in the environment as well as one of the most harmful and most wider-range contaminated industrial waste water. This was followed by conventional drinking water disinfection process with chlorine, during which by-products such as chlorophenisic acid were generated through the chemical reaction between the chlorine and organics in the water. Increasing importance has been attached to treatment on drinking water sources contaminated by chlorophenisic acid. The use of active carbon adsorption technology can effectively degrade and eliminate these harmful pollutants of drinking water. This technology has a very good prospect of application, and will become hotspot in interrelated researches.This paper studied following subjects: 1, the surface chemistry and modification loaded with metal ions of the active carbon, and further test on the structure and surface characteristics of active carbon by volume, surface charge of the determination, electron microscopy including mission-determination and scanning before and after the modification. 2, the analysis about the adsorption effects on chlorophenisic acid before and after the modification of active carbon,and the reaction temperature, the dosage of active carbon and the he absorption effect with the pH value as well. 3, study on the renewable condition of active carbon under the situation of adsorption saturation, and the adsorption efficiency after the regeneration.The study shows that: 1, in the process of active carbon modification,the first step is using concentrated nitric acid on the surface of active carbon to realize chemical modification. Based on this,ferric nitrate and manganese acetate can be used on the surface of active carbon to carry modification loaded with metal ions.Then,determine the pore volume and surface charge,and use the scanning electron microscopy to make further verification. 2, oxidation with nitric acid and modification loaded with metal ions can make the structure of active carbon collapse,reduce the surface area and volume of active carbon ,markedly increase the volume of acid group on the surface of active carbon,increase hydrophilic property on the surface of active carbon,reduce pHpzc value(the pH value when the net external charge of solid surface in water solution is zero),and make the Chlorophenisic acid strongly bound by Ferro-manganese ion loaded on the surface of active carbon . 3, Modified active carbon has much more stronger adsorption capacity on Chlorophenisic acid. In the best absorption capacity ration of 20mg/L Chlorophenisic acid to 20mg active carbon, it is easier for adsorption when the adsorption temperature of active carbon rose to 30℃.Furthermore,it is more conducive for active carbon to adsorb when pH value is in the acidic condition ,an the study makes that pH value around 5 is the best environment. 4 The sodium hydroxide solution at the ratio of 4 to 100 has good desorptionon capacity on Chlorophenisic acid adsorbed by active carbon GAC0, GAC1, FMGAC1, and the adsorption efficiency can reach at least 94% after regeneration.