A series of Gd/N codoped nanoTiO2photocatalyst were synthesized to remove TOC in Power plant Boiler Make-up Water. The catalysts were prepared by sol–gel method and characterized by the means of XRD, TEM and UV-Vis DRS. Compared with pure TiO2, the catalytic activity of the nanocomposite photo-catalyst was improved significantly. The experiment results show that the optimum amounts of Gd and N-codoped TiO2photocatalysts were 0.5 wt.% and 5mol %, respectively. Under the UV irradiation for 5 h at pH 3.0, the photocatalytic effect could be as high as 88% and the TOC removal efficiency was 81%, which indicates that photodegradation and mineralization of HA are synchronous, the two results correlate well.

Diatomite was used as the main material and sodium silicate as the alkali activating solution in this paper. Diatomite light-weigh material was made by chemical foaming method. Compressive strength, density and heat conductivity were used to measure its performances. Results showed that density, compressive strength showed a growth trend while coefficient of thermal conductivity showed the opposite trend with increasing rapid hardening cement and senior gypsum.

Cerium conversion coatings were obtained by immersing hot-dip galvanized steel (HDG) sheets in a cerous nitrate solution. The surface morphologies were observed with scanning electron microscopy. The composition of the coating were determined with X-ray energy dispersive spectrometer and X-ray photoelectron spectroscopy. The results showed that the modified cerium conversion coating grows more quickly than that of common cerium conversion coating. Potentiodynamic polarization and electrochemical impedance spectroscopy measurements revealed that the corrosion resistance of the modified cerium conversion coating was superior to that of common cerium conversion coating and was comparable to that of the conventional chromate passivation coating.

The maximum allowable content of chloride ion in industrial boiler water is closely related to the concentration ratio and operating conditions, the reasons for industrial boiler can not be operated under too high concentration ratio is due to the limit of Cl- content. There are many studies for the electrochemical corrosion behavior of carbon steel caused only by chloride ion, but few studies for calcium and bicarbonate ions on the electrochemical corrosion behavior of carbon steel. In order to study the corrosion of water-wall tubes for industrial boilers (20# carbon steel) caused by chloride ion, the erosive anion (Cl) and Ca2+, electrochemical impedance spectroscopy and Tafel polarization techniques were performed. Autoclave static experiments were performed to study the corrosion inhibition property of carbon steel with 1-hydroxyethylidene-1, 1-diphosphonic acid (HEDP) additive in industrial boiler water medium. The results showed that Cl- could promote the corrosion of carbon steel obviously, HEDP has a good corrosion inhibition effect on 20# carbon steel at a concentration of 25 mg/L; Lower concentration Ca2+ in industrial boiler water could promote the corrosion while addition of higher concentration Ca2+ could inhibit the corrosion. It can provide a reference for the safe operation of the industrial boiler.

With the improvement of living standards, air conditioning becomes the requisite of people’s life; the central air conditioning has become each big building of major appliances[1]. In the whole air conditioning cooling water treatment system, such as scale and sludge which is formed by the metal corrosion phenomenon, will seriously affect the use efficiency of air conditioning. One of the effective solution is adding scale inhibitor to the circulating water. Calcium carbonate deposition method is used to evaluate the scale inhibition rate of PASP, PESA and poly glutamic acid. then evaluate the scale inhibition rate of two compound formula. Results show that PESA with the best scale inhibitor performance, on the basis of its, respectively, compound with PASP and poly glutamic acid. The compound repice can improve the efficiency of scale inhibition. The optimized prescription is that, the PASP is 4mg/L, the PESA is 6mg/L, at this time of scale inhibition efficiency can reach 93.43%.