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Desi Kurniawati
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Chemistry Economics, Econometrics & Finance Industrial & Manufacturing Engineering

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Pengaruh pH dan dosis adsorben dari limbah lumpur aktif industri crumb rubber terhadap kapasitas penyerapan ion Cd(II) dan Zn(II) Salmariza Sy; Desi Kurniawati; Intan Lestari; H Harmiwati; Monik Kasman
Jurnal Litbang Industri Vol 8, No 2 (2018)
Publisher : Institution for Industrial Research and Standardization of Industry - Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (687.214 KB) | DOI: 10.24960/jli.v8i2.4290.95-104

Abstract

Pernelitian dengan sistim batch telah dilakukan untuk mempelajari pengaruh perlakuan pH larutan dan dosis adsorben yang dibuat dari limbah lumpur aktif industri crumb rubber (LLA-ICR) terhadap kapasitas adsorpsi dan efisiensi penyisihan ion Cd(II) dan Zn(II) dalam larutan.  Pengamatan meliputi variasi pH larutan pada range 1-7 dan dosis adsorben LLA-ICR 0,1 g - 1,0 g. Karakterisasi adsorben sebelum dan sesudah proses adsorpsi dilakukan dengan menggunakan FTIR, XRF dan SEM–EDX. Hasil penelitian menunjukkan bahwa perlakuan pH larutan dan dosis adsorben berpengaruh pada kapasitas adsorpsi dan efisiensi penyisihan ion Cd(II), dan Zn(II).  pH optimum didapatkan pada pH 5. Semakin rendah dosis adsorben, maka semakin tinggi kapasitas adsorpsi namun semakin rendah efisiensi penyisihan ion Cd(II) dan Zn(II).  Dosis adsorben optimum didapatkan pada 0,1g, dengan kapasitas adsorpsi dan efisiensi penyisihan ion Cd(II) > Zn(II). Kapasitas adsorpsi maksimum untuk ion Cd(II) dan  Zn(II) berturut-turut 29,8 mg/g dan 10,3 mg/g. Efisiensi penyisihan maksimum intuk ion Cd(II) dan ion Zn(II) adalah 95,4% dan 87,9%. AbstractA batch system has been carried out to study the treatment effect of pH solution and adsorbent dosage derived from crumb rubber (LLA-ICR) industrial activated sludge on the adsorption capacity and removal efficiency of Cd(II) and Zn(II) ions in aqueous solution. Observations included variations in the the solution pH in the range 1-7 and the LLA-ICR adsorbent dosage of 0.1 g - 1.0 g. Characterization of the adsorbent before and after the adsorption process was carried out using FTIR, XRF, and SEM-EDX. The results showed that the treatment of the pH solution and the adsorbent dose affected the adsorption capacity and removal efficiency of Cd(II) and Zn(II) ions. The optimum pH was obtained at pH 5. The lower the adsorbent dose the higher the adsorption capacity, however the lower the efficiency removal of Cd(II) and Zn(II) ions. The optimum adsorbent dosage was obtained at 0.1 g with adsorption capacity and removal efficiency of Cd(II) > Zn(II) ions. The maximum adsorption capacity for Cd(II) and Zn(II) ions were 29.8 mg/g and 10.3 mg/g respectively. The maximum removal efficiency forCd (II) and Zn(II) ions were 95.4% and 87.9%.
Pengaruh pH dan dosis adsorben dari limbah lumpur aktif industri crumb rubber terhadap kapasitas penyerapan ion Cd(II) dan Zn(II) Salmariza Sy; Desi Kurniawati; Intan Lestari; H Harmiwati; Monik Kasman
Jurnal Litbang Industri Vol 8, No 2 (2018)
Publisher : Institution for Industrial Research and Standardization of Industry - Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (687.214 KB) | DOI: 10.24960/jli.v8i2.4290.95-104

Abstract

Pernelitian dengan sistim batch telah dilakukan untuk mempelajari pengaruh perlakuan pH larutan dan dosis adsorben yang dibuat dari limbah lumpur aktif industri crumb rubber (LLA-ICR) terhadap kapasitas adsorpsi dan efisiensi penyisihan ion Cd(II) dan Zn(II) dalam larutan.  Pengamatan meliputi variasi pH larutan pada range 1-7 dan dosis adsorben LLA-ICR 0,1 g - 1,0 g. Karakterisasi adsorben sebelum dan sesudah proses adsorpsi dilakukan dengan menggunakan FTIR, XRF dan SEM–EDX. Hasil penelitian menunjukkan bahwa perlakuan pH larutan dan dosis adsorben berpengaruh pada kapasitas adsorpsi dan efisiensi penyisihan ion Cd(II), dan Zn(II).  pH optimum didapatkan pada pH 5. Semakin rendah dosis adsorben, maka semakin tinggi kapasitas adsorpsi namun semakin rendah efisiensi penyisihan ion Cd(II) dan Zn(II).  Dosis adsorben optimum didapatkan pada 0,1g, dengan kapasitas adsorpsi dan efisiensi penyisihan ion Cd(II) > Zn(II). Kapasitas adsorpsi maksimum untuk ion Cd(II) dan  Zn(II) berturut-turut 29,8 mg/g dan 10,3 mg/g. Efisiensi penyisihan maksimum intuk ion Cd(II) dan ion Zn(II) adalah 95,4% dan 87,9%. AbstractA batch system has been carried out to study the treatment effect of pH solution and adsorbent dosage derived from crumb rubber (LLA-ICR) industrial activated sludge on the adsorption capacity and removal efficiency of Cd(II) and Zn(II) ions in aqueous solution. Observations included variations in the the solution pH in the range 1-7 and the LLA-ICR adsorbent dosage of 0.1 g - 1.0 g. Characterization of the adsorbent before and after the adsorption process was carried out using FTIR, XRF, and SEM-EDX. The results showed that the treatment of the pH solution and the adsorbent dose affected the adsorption capacity and removal efficiency of Cd(II) and Zn(II) ions. The optimum pH was obtained at pH 5. The lower the adsorbent dose the higher the adsorption capacity, however the lower the efficiency removal of Cd(II) and Zn(II) ions. The optimum adsorbent dosage was obtained at 0.1 g with adsorption capacity and removal efficiency of Cd(II) > Zn(II) ions. The maximum adsorption capacity for Cd(II) and Zn(II) ions were 29.8 mg/g and 10.3 mg/g respectively. The maximum removal efficiency forCd (II) and Zn(II) ions were 95.4% and 87.9%.
The Influence of Inflation, Interest Rates, Dividend Policy on Stock Prices in the Infrastructure and Transportation Sector in East Java Desi Kurniawati
Journal of Islamic Economics and Finance Vol. 1 No. 1 (2025): Journal of Islamic Economics and Finance
Publisher : Athallah Publishing Globalindo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64845/almudayanah.v1i1.1

Abstract

Infrastructure and transportation companies experienced a decline in stock prices a few years ago. This can be triggered by inflation, interest rates, and the company's dividend policy. Inflation and interest rates that change every year and dividend policy which is a measurement of profits earned by companies. The purpose of this study was to look at how inflation, interest rates, and dividend policies affect a company's share price. This research involves all companies in the field of infrastructure and transportation, the sampling criteria are as follows: companies listed in the foam securities from 2020-2024, companies uploading financial statements in 2020-2024, and companies that regularly distribute dividends in 2020-2024. 12 companies were selected through purposive sampling. This study was descriptive and quantitative and analyzed using several tests: normality, multicollinearity, heteroscedasticity, autocorrelation, linear regression, and T (Partial) test. The data was processed with the SPSS 24 analysis tool. The results showed that if inflation does not affect stock prices as indicated by the t-test, then the inflation value is 0.561 > 0.05. The interest rate has no effect on the stock price, as evidenced by the T-test obtained an interest rate value of 0.278 > 0.05. Dividend policy affects stock price, as seen in the T-test of the SIG value of dividend policy of 0.004 < 0.05.
Co-Authors H Harmiwati Intan Lestari Monik Kasman Salmariza Sy