Remediation Of P-arsanilic Acid Polluted Water By Biochar-loaded Manganese Ferrite And Its Benefit Analysis

With the increasing demand for meat products by humans,the application of p-arsanilic acid as a feed additive for livestock is becoming more and more widespread.However,parsanilic acid mainly exists in the environment in the form of inorganic or organic arsenic after being discharged from livestock,which is easy to cause arsenic pollution,and thus threatens to the environmental safety and human health.Therefore,it is necessary to study and develop an efficient environmental dispersion p-arsanilic acid removal technology.In this study,a new biochar-loaded manganese ferrite(MFB-MCs)was prepared,and utilized to remove p-arsanilic acid in water,and its microstructure and surface morphology were observed by scanning electron microscopy,X-ray diffractometer,X-ray photoelectron spectrometer,fourier transform infrared spectroscopy,vibrating sample magnetometer,and transmission electron microscopy.The adsorption effect of MFB-MCs on p-arsanilic acid with the concentration of 20 mg/L and solution volume of 50 mL was studied under different parameters such as pH value(2.0～11.0),dosage(0.20 g/L～1.80 g/L)and temperature(25℃ ～45℃),and the optimal economic benefit condition was determined.The optimal oxidative degradation effect of MFB-MCs on p-arsanilic acid with the concentration of 20 mg/L and solution volume of 50 mL was analyzed by oxidant dosage(0～ 10.00 g /L),MFB-MCs dosage(0～ 3.00 g /L),pH value(2.0～11.0),temperature(25℃～55℃)etc,and the main active free radical was determined.Furthermore,the social,economic and ecological environment benefits of the degradation of p-arsanilic acid via MFB-MCs under optimal conditions was analyzed,which may provide theoretical basis and a statistical reference for the practical application of MFBMCs to remove p-arsanilic acid in water.We can obtain the following results:(1)the manganese ferrite materials are well loaded on vinasse based biochar via the characterization of MFB-MCs materials using different methods,and the material has good magnetic separation properties;(2)the adsorption process of p-arsanilic acid using MFB-MCs conforms to the pseudo-second kinetic model and the Freundlich isotherm equation(the test is carried out at a temperature of 25 °C,pH=2.0 and MFB-MCs dosage of 1.00 g/L),the sorption removal efficiency was achieved the best with 82.27% after 1440 minutes of reaction;(3)the optimum conditions for p-arsanilic acid degradation were obtained(the dosage of MFB-MCs was 1.00 g/L at p H=7.0,temperature 25 °C,0.50 g/L sodium persulfate),among them,hydroxyl radicals(·OH)play a major role.MFB-MCs can effectively oxidize p-arsanilic acid into As(Ⅴ),and the material can remove As(Ⅴ)by strong adsorption,so that the arsenic concentration was completely removed.;(4)the social,economic and ecological benefit analysis was satisfactory under the optimum condition for the degradation of p-arsanilic acid,and the cost of chemical reagents for the treatment of one ton of 20 mg/L p-arsanilic acid is 6.58 yuan and the electricity cost is about 2290.91 yuan.In field applications,MFB-MCs can be used to treat the water contaminated by p-arsanilic acid,which fully conforms to the concept of social sustainable development.