Adsorption Of Estrogen From Different Raw Biochar Materials

Industry and agriculture are developing rapidly,a large number of environmental estrogens are used and discharged into the water environment.Causing a lot of environmental problems,causing environmental quality deterioration and even ecosystem imbalance,and posing a serious threat to water,atmosphere,soil,animals and plants and human beings.Water environment is an important place for the survival and development of human society,It is also the most serious influenced and damage area by human beings,estrogen trace but strong effect,wide pollution range,lasting,biological accumulation,so water residual estrogen environmental problems was widely concerned,In some conditions,Environmental estrogen and its influence factors will cause irreversible pollution in groundwater.Estrogen released into the water environment will pollute the water body,and expand the pollution range when transferring to other environments.The residue of estrogen will also promote the evolution of antibiotic-resistant microorganisms,producing toxicity,drug resistance,pollution,and even harmful to human body.The most effective control method is to alleviate estrogen pollution from the pollution source and the transmission route,so it is crucial to understand the migration and transformation of environmental estrogen in the environment.Biochar is widely used in industrial and agricultural production because of its unique physical and chemical characteristics,including adsorption effect,bioenergy,greenhouse gas emission reduction,soil nitrogen fixation,improvement and remediation,etc.The structure and physicochemical properties of different raw material biochar materials are different.Biochar can influence their migration and further influence the adsorption behavior of environmental estrogen,which has attracted wide attention of many scholars to the research on the mechanism of reducing environmental pollution at home and abroad.Therefore,the study of different raw material biochar for estrogen adsorption is crucial,so this study takes the adsorption data of bisphenol A and 17?-ethynylestradiol by cypress biochar,grapefruit peel biochar,bamboo biochar,peanut shell biochar,corn straw biochar and wheat straw biochar as the research object to explore the effects of biochar and pollutans,then analyze the effects of different biochar on adsorption of pollutants.The main achievements are as follows:1.The surface functional groups of different raw material biochar include hydroxyl group and carboxyl group,and has the number of micropores,small space and large specific surface area,which are conducive to the adsorption of estrogen.2.The adsorption capacity of biochar to pollutants is affected by the hydrophobicity of the adsorbent.The hydrophobicity and aromaticity of different biochar are different,and the adsorption amount of bisphenol A and 17?-ethynylestradiol are different,respectively.Studying the isothermal adsorption experiments,we found that the Freundlich model was fitted better compared to the Langmuir model.For different biocarbon of bisphenol A and17?-ethynylestradiol adsorption,with the rise of biochar preparation temperature,Oxygenic functional groups such as hydroxyl and carboxyl groups were gradually decreased while high temperature makes biochar pore cracking,increase the number of holes,a single pore smaller,the specific surface area increases,and the pore-filling effect allows for a better adsorption of oestrogen to the biochar.3.The adsorption capacity of biochar to pollutants is also affected by the adsorbent,and the adsorption capacity of the same biochar to different pollutants is different,which is affected by the hydrophobic properties of pollutants and the surface functional group.For bisphenol A and17?-ethynylestradiol,under the influence of the stereostructure of bisphenol A,it is easier to adsorb on the surface of biochar,and there are two benzene rings on the surface of bisphenol A,and the beta-electron donor acceptor formed between biochar is stronger,so the adsorption capacity of biochar to bisphenol A is stronger than 17?-ethynylestradiol.