Nano FeS zol dozasining elektrolizlangan elektr isitish quvurlarini davolash ta'siriga ta'siri

Nano FeS zol dozasining elektrolizlangan elektr isitish quvurlarini davolash ta'siriga ta'siri

Nano FeS zollari chiqindi suvdan Cr (VI) ni afzal ko'rishi mumkin, chunki yog'ingarchilikning konversiya reaktsiyalari natijasida hosil bo'lgan FeS va CuS va NiS ham Cr (VI) ni Cr (III) ga kamaytiradi va keyin Cr (OH) 3 ni hosil qiladi. olib tashlash uchun gidroksidi sharoitda yog'ingarchilik. Nano FeS zolining dozasi 2,5 g/L ga (ya'ni nazariy dozadan 1,2 baravar ko'p) yetganda, tozalangan oqava suvdagi Cr (VI), Cu2 plus va Ni2 plus milliy elektrokaplama oqava suvlarni chiqarish standarti talablariga javob berishi mumkin. 7]. Eksperimental natijalarga ko'ra, nanoFeS zolining optimal dozasi 2.5-3.0 g/L (ya'ni, nazariy dozadan 1.2-1.5 marta).

2.2 pH ning davolash samaradorligiga ta'siri

200 ml simulyatsiya qilingan oqava suvni oling va uni 250 ml stakanga soling. 1.0 mol/l sulfat kislota eritmasi bilan pH ni 3.0, 4.0, 6.0 va 8.0 ga sozlang. va/yoki mos ravishda 2.0 mol/L NaOH eritmasi. 3,0 g/l 10 foiz nano FeS zol qo‘shing va magnit aralashtirgichda 15 daqiqa davomida aralashtiring; PH ni 8,0 ga sozlang, 1 ml 0,5 foizli PAM eritmasidan qo'shing, 5 daqiqaga qoldiring, filtr qog'ozi bilan filtrlang va filtratdagi metall ionlari konsentratsiyasini o'lchang.

Odatda, Cr (VI), Cu2 plus va Ni2 plus o'z ichiga olgan elektrokaplama oqava suvlari kislotali bo'lib, pH qiymati 3-6. Bundan tashqari, pH qachon<3.0, due to the strong acidity, it may cause FeS to decompose and generate H2S to escape. Therefore, the pH range chosen for the experiment is between 3.0 and 8.0. From Figure 2, it can be seen that under weakly acidic conditions (pH ranging from 3.0 to 6.0), the nano FeS sol has a good treatment effect on electroplating wastewater containing Cr (VI), Cu2+, and Ni2+. The residual heavy metal ions in the treated wastewater have met the requirements of the national electroplating wastewater discharge standard. When the pH is 8.0, the slow reduction rate of Cr (VI) by nano FeS sol under alkaline conditions leads to a higher residual concentration of Cr (VI) in the treated wastewater; In addition, the coordination ability of chelating agents such as EDTA is enhanced under alkaline conditions, which affects the formation of sulfide precipitates between Cu2+, Ni2+and nano FeS sol, resulting in a certain degree of residual Cu2+, Ni2+. Therefore, the optimal pH for treating electroplating wastewater containing Cr (VI), Cu2+, and Ni2+with nano FeS sol is 3.0-6.0.

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