SHOLI QOBIG‘INI MODIFIKATSIYALAB OLINGAN BIOSORBENTNING NI(II) IONLARINI YUTISH KINETIKASI
Annotatsiyalar
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Ўзбек
Ushbu maqolada chiqindi maxsulotlardan biosorbentlar ularni hossalari haqida qisqacha ma’lumot keltirilgan. Keltirilgan biosorbentlarga kimyoviy tarkibi o‘xshash va modifikatsiyalashga qulay funksiyanal guruhlarga ega sholi qobig‘ini mochovinaning suvli eritmada modifikatsiya sharoitlari keltirilgan. Mexnik tozalangan sholi qobig‘i, aktiflangan sholi qobig‘i hamda modifikatsiyalangan sholi qobig‘i namunalari tarkibi element analiz tahlili o‘tkazildi. Olingan biosorbentni fizik-kimyoviy xossalari o‘rganildi. Biosorbentni Ni(II) ionini statik sharoitda suniy eritmadan yutish maksimal miqdori 245.8 mg/g ekanligi aniqlandi. Eritma konsentratsiyasi, sorbsiya davomiyligi va haroratning sorbsiya jarayoniga ta’siri o‘rganildi. Biosorbentning metall ionilarini yutgan miqdori, eritmalarning UV-spektrofotometrdagi dastlabki va sorbsiyadan kiyingi nur sindirish ko‘rsatgichlarini eritma kansentratsiyasiga bog‘liqlik grafigi asosida xisoblab topildi. Aniqlangan metall ionlarining sorbent tomonidan yutilish kinetikasini o‘rganib, sorbsiya jarayoni psevdo-birinchi tartibiliy (R2=0.8132) va psevdo-ikkinchi tartibiliy (R2=0.999) kinetik modellari aniqlandi. Bundan sorbsiya jarayoni psevdo-ikkinchi kinetik modelga bo‘ysunishi aniqlandi.
Kalit so'z: #biomassa #sorbsiya #kinetika #kationit #biosorbent #mochovina #nikel(II) ioni #statik almashinuv sig‘imi #psevdo-birinchi
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Русский
В данной статье представлена краткая информация об отходах биосорбентов и их источниках. Представлены условия модификации гумуса рисовой шелухи в водном растворе функциональными группами, аналогичными указанным биосорбентам, и удобными для модификации функциональными группами. Проведен элементный анализ состава образцов рисовой шелухи механической очистки, активированной рисовой шелухи и модифицированной рисовой шелухи. Изучены физико-химические свойства полученного биосорбента. Установлено, что максимальная величина поглощения биосорбентом ионов Ni(II) из искусственного раствора в статических условиях составляет 245,8 мг/г. Исследовано влияние концентрации раствора, продолжительности сорбции и температуры на процесс сорбции. Количество поглощенных биосорбентом ионов металлов рассчитывали на основании графика зависимости исходного и постсорбционного показателей преломления растворов от концентрации раствора в УФ-спектрофотометре. При изучении кинетики поглощения идентифицированных ионов металлов сорбентом процесс сорбции был псевдопервого порядка (R2=0,8132) и псевдовторого порядка (R2=0,999). Отсюда было определено, что процесс сорбции подчиняется псевдосекундной кинетической модели.
Kalit so'z: #biomassa #sorbsiya #kinetika #kationit #biosorbent #mochovina #nikel(II) ioni #statik almashinuv sig‘imi #psevdo-birinchi
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English
This article provides a summary of biosorbent wastes and their sources. The conditions for modifying rice husk humus in an aqueous solution with functional groups similar to the indicated biosorbents and functional groups convenient for modification are presented. Elemental analysis of the composition of samples of mechanically cleaned rice husks, activated rice husks and modified rice husks was carried out. The physicochemical properties of the obtained biosorbent were studied . It has been established that the maximum absorption of Ni (II) ions by the biosorbent from an artificial solution under static conditions is 245.8 mg/g. The effect of solution concentration, sorption duration, and temperature on the sorption process has been studied. The amount of metal ions absorbed by the biosorbent was calculated based on the plot of the dependence of the initial and postsorption refractive indices of solutions on the concentration of the solution in a UV spectrophotometer . When studying the kinetics of absorption of identified metal ions by the sorbent, the sorption process was psevdo -first order (R2=0.8132) and psevdo -second order (R2=0.999). Hence, it was determined that the sorption process obeys the psevdosecond kinetic model.
Kalit so'z: #biomassa #sorbsiya #kinetika #kationit #biosorbent #mochovina #nikel(II) ioni #statik almashinuv sig‘imi #psevdo-birinchi
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