activated carbon adsorption of phosphate follows thequasi-second order kinetic model; Freundlich R'correlation coefficients were significant, therefore,grapefruit peel activated carbon adsorption of phosphorus found Freundlich isotherm model;initialconcentration, dosage, pH and adsorption temperature on adsorption of phosphorus are affected, pH onthe adsorption of non- large.
(4) Adsorption at adsorption equilibrium was achieved after 14h, the adsorption capacityremained at 21.5 mg / g above. Grapefruit peei activated carbon Cr () in the adsorption processfollowed pseudo second order kinetic model; by the Langmuir equation and Freundlich equation of thecorrelation coefficient R' known,consistent with Langmuir isotherm model and the Freundlichisotherm model.Using Langmuir isotherm model to analyze the experimental data obtained in thesolution pH 4, the maximum adsorption capacity was 26.25mg / g;Freundlich isotherm model usingBecause activated carbon has numerous small pores, large surface area, strong adsorption capacity, can adsorb a variety of organic compounds, widely used in pharmaceutical industry and chemical industry.hsl abrasives
Especially in the field of medicine, activated carbon, as a highly effective gastrointestinal cleaning agent, can effectively adsorb pesticide residues, fungicides, heavy metals, dioxins, various pathogenic bacteria and toxins in the digestive tract and human body that damage human health or cause disease wastes, harmless to human body.In painting, printing, shoe making, plastic, rubber, bonding and other industrial processes, there are a large number of organic waste gas emissions.These waste gas, often contain benzene, toluene, xylene, ethyl acetate, methanol and other organic matter, itself toxic, long-term damage can lead to human death.The emission of this kind of waste gas, countries have clear provisions, strict control of its emission concentrationThe treatment of organic waste gas has been studied for a long time, and some effective control technologies have been developed.The widely used and studied control techniques include adsorption method, thermal destruction method, condensation method, absorption method, etc.Urban sludge is a carbon material rich in organic matter. The preparation of activated carbon can not only solve the disposal problem of sludge, but also generate efficient and cheap adsorbent, which conforms to the scientific concept of circular economy and sustainable development.
In this paper, the sludge of the municipal sewage plant was used as raw material, and the activated carbon was prepared by chemical activation method, and the adsorption of lead and cadmium was studied with it, so as to realize the use of waste for waste control. The conclusions are as followsalumina fused grit

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